ENGINE CONTROL SYSTEM OPERATION INSPECTION [L8, LF, L3]

Input Signal System Inspection Procedure

1. Find an irregular signal. (See Finding irregular signals.)

2. Locate source. (See Locating the source of unusual signals.)

3. Repair or replace the malfunctioning part.

4. Confirm that the irregular signal is no longer detected.

Finding irregular signals

While referring to ON-BOARD DIAGNOSTIC TEST [L8, LF, L3], use the PID/DATA monitor and record function to inspect the input signal system relating to the problem.

1. Start the engine and idle the vehicle. You can assume that any signals that are out of specification by a wide margin are irregular.

2. When recreating the problem, any sudden change in monitor input signals that is not intentionally created by the driver can be determined as irregular.

Locating the source of unusual signals

Caution

• Compare the WDS or equivalent monitor voltage with the measurement voltage using the digital measurement system function. If you use another tester, misreading may occur.

• When measuring voltage, attach the tester GND to the GND of the PCM that is being tested, or to the engine itself. If this is not performed, the measured voltage and actual voltage may differ.

• After connecting the pin to a waterproof coupler, confirming continuity and measuring the voltage, inspect the waterproof connector for cracks. If there are any, use sealant to fix them. Failure to do this may result in deterioration of the wiring harness or terminal from water damage, leading to problems with the vehicle.

Variable resistance type 1 (TP sensor and EGR boost sensor)

Input signal system inspection for variable resistance type 1

1. When an irregular signal is detected, measure the #1 PCM terminal voltage.

• If the #1 terminal voltage and the WDS or equivalent monitor voltage are the same, proceed to the next step.

• If there is a difference of 0.5 V or more, inspect for the following points concerning the PCM connector:

- Female terminal opening is loose.

- Coupler (pin holder) damage

- Pin discoloration (blackness)

- Harness/pin crimp is loose or disconnected.

2. Measure the #2 sensor terminal voltage.

• If there is a 0.5 V or more difference between the sensor and the WDS or equivalent voltages, inspect the wiring harness for open or short circuits.

• If the sensor and the WDS or equivalent voltages are the same, inspect for the following points concerning the sensor connector:

- Female terminal opening is loose.

- Coupler (pin holder) damage

- Pin discoloration (blackness)

• If there are no problems, proceed to next investigation below.

Standard power supply system inspection for variable resistance type 1

•  Confirm that the #3 terminal is at 5 V.

- If the measured voltage on the #3 terminal is 5 V, inspect the following points on the sensor connector.

- If there is no problem, inspect for the following:

• Female terminal opening is loose.

• Coupler (pin holder) damage

• Pin discoloration (blackness)

- If the #3 terminal measures other than 5 V, inspect for the following:

• Open or short circuit in wiring harness

• Harness/pin crimp is loose or disconnected.

GND system inspection for variable resistance type 1

• Confirm that terminal sensor #5 is at 0 V.

- If it is at 0 V, inspect the sensor.

• If necessary, replace the sensor.

- If not, inspect for the following:

• Open or short circuit in wiring harness

• Female terminal opening is loose causing an open or short circuit in wiring harness

• Coupler (pin holder) damage

• Pin discoloration (blackness)

• Harness/pin crimp is loose or disconnected.

Variable resistance type 2 (mass air flow (MAF) sensor and VSS)

GND system inspection for variable resistance type 2

• Confirm that terminal sensor #4 is at 0 V.

- If it is at 0 V, inspect the sensor.

• If necessary, replace the sensor.

- If not at 0 V, inspect for the following:

• Open circuit in wiring harness

• Female terminal opening is loose.

• Coupler (pin holder) damage

• Pin discoloration (blackness)

• Harness/pin crimp is loose or disconnected.

Input signal system inspection for variable resistance type 2

1. When an irregular signal is detected, measure the #1 PCM terminal voltage.

• If the #1 terminal voltage and the WDS or equivalent monitor voltage are the same, proceed to the next step.

• If there is a difference of 0.5 V or more, inspect for the following points concerning the PCM connector:

- Female terminal opening is loose.

- Coupler (pin holder) damage

- Pin discoloration (blackness)

- Harness/pin crimp is loose or disconnected.

2. Measure the #2 sensor terminal voltage.

• If there is a 0.5 V or more difference between the sensor and the WDS or equivalent voltages, inspect the wiring harness for open or short circuits.

• If the sensor and the WDS or equivalent voltages are the same, inspect the following points concerning the sensor connector:

- Female terminal opening is loose.

- Coupler (pin holder) damage

- Pin discoloration (blackness)

- Harness/pin crimp is loose or disconnected.

• If there are no problems, proceed to next investigation below.

Electrical supply system inspection for variable resistance type 2

• Confirm that the sensor #3 terminal is B+.

- If the measured voltage on the #3 terminal is B+, inspect the following points on the sensor connector.

- If there is no problem, inspect for the following:

• Female terminal opening is loose.

• Coupler (pin holder) damage

• Pin discoloration (blackness)

- If the #3 terminal measures other than B+, inspect the following:

• Open or short circuit in wiring harness

• Harness/pin crimp is loose or disconnected.

Thermistor type (IAT sensor and ECT sensor)

Input signal system inspection for thermistor type

1. When an irregular signal is detected, measure the #1 PCM terminal voltage.

• If the #1 terminal voltage and the WDS or equivalent monitor voltage are the same, proceed to the next step.

• If there is a difference of 0.5 V or more, inspect the following points concerning the PCM connector:

- Female terminal opening loose

- Coupler (pin holder) damage

- Pin discoloration (blackness)

- Harness/pin crimp is loose or disconnected.

2. Measure the #2 sensor terminal voltage.

• If there is a 0.5 V or more difference between the sensor and the WDS or equivalent voltages, inspect the wiring harness for open or short circuits.

• If the sensor and the WDS or equivalent voltages are the same, inspect the following points concerning the sensor connector:

- Female terminal opening is loose.

- Coupler (pin holder) damage

- Pin discoloration (blackness)

- Harness/pin crimp is loose or disconnected.

• If there are no problems, proceed to next investigation below.

GND system inspection for thermistor type

• Confirm that terminal sensor #3 is at 0 V.

- If it is at 0 V, inspect the sensor. If necessary, replace the sensor.

- If not, inspect for the following:

• Open circuit in wiring harness

• Female terminal opening is loose.

• Coupler (pin holder) damage

• Pin discoloration (blackness)

• Harness/pin crimp is loose or disconnected.

Main Relay Operation Inspection

1. Verify that the main relay clicks when the ignition switch is turned to ON position and off.

• If there is no operation sound, inspect the following:

- Main relay (See RELAY INSPECTION.)

- Harness and connector between ignition switch and main relay terminal A.

- Harness and connector between PCM terminal 1AT and main relay terminal B.

Intake Manifold Vacuum Inspection

1. Verify air intake hoses are installed properly.

2. Start the engine and run it at idle.

3. Disconnect the vacuum hose between the intake manifold and purge solenoid valve from the intake manifold side.

4. Connect a vacuum gauge to the intake manifold and measure the intake manifold vacuum.

• If not as specified, inspect the following:

More than 60 kPa {450 mmHg, 18 inHg}

Note

• Air suction can be located by engine speed change when lubricant is sprayed on the area where suction is occurring.

- Air suction at throttle body, intake manifold and PCV valve installation points

- EGR valve (stuck open)

- Fuel injector insulator

- Engine compression

(See COMPRESSION INSPECTION [L8, LF, L3].)

Electronic Throttle Control System Inspection

Engine coolant temperature compensation inspection

1. Connect the WDS or equivalent to the DLC-2.

2. Access the following PIDs:

• ECT

• IAT

• RPM

3. Verify that the engine is cold, then start the engine.

4. Verify that the engine speed decreases as the engine warms up.

• If the engine speed does not decrease or decreases slowly, inspect the following:

- ECT sensor and related wiring harness

(See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [L8, LF, L3].)

- Electronic throttle body and related wiring harness

Load compensation inspection

1. Start the engine and idle it.

2. Connect the WDS or equivalent to the DLC-2.

3. Verify that P0506, P0507, or P0511 is not displayed.

• If P0506, P0507 or P0511 are displayed, perform DTC inspection.

(See DTC TABLE [L8, LF, L3].)

4. Access the RPM PID.

Note

• Excludes temporary idle speed drop just after the loads are turned on.

5. Verify that the engine speed is within the specification under each load condition.

• If load condition is not as specified, inspect the following:

- A/C switch and related wiring harness

(See CLIMATE CONTROL UNIT INSPECTION.)

- Fan switch and related wiring harness

(See CLIMATE CONTROL UNIT INSPECTION.)

Engine speed

Load condition		Engine speed (rpm)*1
		MTX	ATX
No load		600-700	650-750
E/L operating*2	38-48 A	650-750
	more than 48 A	700-800
A/C operating*3	Refrigerant pressure low*4	700-800	650-750
	Refrigerant pressure high*5	700-800	670-770

^*1 :

Neutral or P position

^*2 :

Generator generating current value

^*3 :

A/C switch and fan switch are on.

^*4 :

Refrigerant pressure switch (middle pressure) is off.

^*5 :

Refrigerant pressure switch (middle pressure) is on.

Throttle position (TP) sweep inspection

1. Connect the WDS or equivalent to the DLC-2.

2. Turn the ignition switch to the ON position.

3. Verify that none of the following DTC are displayed:

• P0122, P0123, P0222, P0223, P0638, P2100, P2101, P2102, P2103, P2107, P2108, P2119, P2122, P2123, P2127, P2128, P2135, P2138

- If any one DTC is displayed, perform DTC inspection.

4. Access TP_REL PID.

5. Verify that the PID reading is within the CTP value. (See PCM INSPECTION [L8, LF, L3].)

• If the PID reading is out of range, perform the following:

- Remove the air duct from the throttle valve body.

- Verify that the throttle valve opens when the accelerator pedal is depressed.

• If the throttle valve opens, inspect the throttle position sensor and related wiring harness.

• If the throttle valve does not open, inspect the throttle actuator control motor and related wiring harness.

6. Gradually depress the throttle pedal and verify that the PID reading increases accordingly.

• If the PID reading drops momentarily, inspect the following:

- Throttle position sensor

7. Fully depress the throttle pedal and verify that the PID reading is within WOT value. (See PCM INSPECTION [L8, LF, L3].)

• If the PID reading is out of range, perform the followings:

- Remove the air duct from throttle valve body.

- Verify that the throttle valve opens when throttle pedal is depressed.

• If the throttle valve opens, inspect the throttle position sensor and related wiring harness.

• If the throttle valve does not open, inspect the throttle actuator control motor and related wiring harness.

Variable Air Duct (VAD) Control System Operation Inspection [LF, L3]

1. Connect WDS or equivalent to DLC-2.

2. Access ECT, TP and RPM PIDs.

3. Start the engine.

4. Verify ECT PID is 70°C {158°F} or over.

5. Inspect shutter valve operation following condition.

VAD shutter valve operation

• If the shutter valve operation is not specified, inspect as follows.

(1) Verify that DTC P1410 is not displayed.

• If DTC P1410 is shown, carry out DTC inspection.

(See DTC TABLE [L8, LF, L3].)

(2) Turn ignition switch to ON.

(3) Turn the VAD control solenoid valve from on to off using the VAD PID and verify that operation sound of the solenoid valve is heard.

• If the operation sound is heard, inspect the following.

- Vacuum hose looseness or damage

- Vacuum chamber crack or damage

- Shutter valve actuator.

(See VARIABLE AIR DUCT (VAD) SHUTTER VALVE INSPECTION [L3].)

• Shutter valve stuck open or close

- If the operation sound is not heard, inspect following.

- VAD control solenoid valve.

(See VARIABLE AIR DUCT (VAD) SOLENOID VALVE INSPECTION [L3].)

Variable Intake-air Control Operation Inspection [LF, L3]

1. Start the engine.

2. Inspect the rod operation under the following condition:

Rod operation

• If the rod operation is not as specified, inspect as follows:

(1) Stop the engine.

(2) Connect the WDS or equivalent to the DLC-2.

(3) Verify that DTC P0661 or P0662 is not displayed.

• If DTC P0661 or P0662 is shown, perform DTC inspection.

(See DTC TABLE [L8, LF, L3].)

(4) Inspect the variable intake-air solenoid valve.

(See VARIABLE INTAKE AIR SOLENOID VALVE INSPECTION [LF, L3].)

• If the variable intake-air solenoid valve is not normal, replace the variable intake-air solenoid valve.

(See INTAKE AIR SYSTEM REMOVAL/INSTALLATION [L8, LF, L3].)

• If the variable intake-air solenoid valve is normal, inspect the following:

- Vacuum hose and vacuum chamber for looseness or damage

- Shutter valve actuator

(See VARIABLE INTAKE AIR SHUTTER VALVE ACTUATOR INSPECTION [LF, L3].)

- Shutter valve stuck open or closed

Variable Tumble Control Operation Inspection

1. Connect the WDS or equivalent to the DLC-2.

2. Access ECT PID.

3. Verify that ECT PID is between 63 °C {145 °F} and 67 °C {152 °F}.

4. Start the engine.

5. Inspect rod operation under the following conditions:

Rod operation

• If the rod operation is not specified, inspect as follows:

(1) Verify that DTC No. P2006, P2009 or P2010 is not displayed.

• If DTC No. P2006, P2009 or P2010 are shown, perform DTC inspection.

(See DTC TABLE [L8, LF, L3].)

(2) Inspect the variable tumble solenoid valve.

(See VARIABLE TUMBLE SOLENOID VALVE INSPECTION [L8, LF, L3].)

• If the variable tumble solenoid valve is not normal, replace the variable tumble solenoid valve.

(See INTAKE AIR SYSTEM REMOVAL/INSTALLATION [L8, LF, L3].)

• If the variable tumble solenoid valve is normal, inspect the following:

- Vacuum hose and vacuum chamber for looseness or damage

- Shutter valve actuator

(See VARIABLE TUMBLE SHUTTER VALVE ACTUATOR INSPECTION [L8, LF, L3].)

- Shutter valve stuck open or closed

Fuel Injector Operation Inspection

Fuel Cut Control System Inspection

1. Warm up engine and idle it.

2. Turn off the electrical loads and A/C switch.

3. Connect the WDS or equivalent to the DLC-2.

4. Access RPM PID.

5. Listen for the fuel injector operation sound at all cylinders using the soundscope and monitor both PIDs while performing the following steps:

(1) Depress the accelerator pedal and increase the engine speed to 4,000 rpm.

(2) Quickly release the accelerator pedal (brake pedal is not depressed) and verify that the fuel injector operation sound stops, and starts again when the engine speed drops below 1,200 rpm.

• If not as specified, inspect the following:

- ECT sensor and related wiring harness

(See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [L8, LF, L3].)

- Neutral/clutch pedal position switch and related wiring harness (MTX)

(See CLUTCH PEDAL POSITION (CPP) SWITCH INSPECTION [L8, LF, L3].)

- TR switch and related wiring harness (ATX)

(See TRANSAXLE RANGE (TR) SWITCH INSPECTION [JA5AX-EL].)

Fuel Pump Operation Inspection

1. Remove the fuel-filler cap.

2. Turn the ignition switch to the ON position.

3. Turn the fuel pump relay from off to on using the FP PID and inspect if the operation sound is heard.

• If no operation sounds is heard, proceed to next step.

4. Measure voltage at wiring harness side fuel pump connector terminal C (California emission regulation applicable model), A (except for California emission regulation applicable model).

B+ (Ignition switch at on)

• If the voltage is as specified, inspect the following:

- Fuel pump continuity

- Fuel pump GND

- Wiring harness between fuel pump relay and PCM terminal 1H (with immobilizer system), 1G

(without immobilizer system)

• If not as specified, inspect the following:

- Fuel pump relay

- Wiring harness connector (Main relay - fuel pump relay - fuel pump.)

Fuel Pump Control System Inspection

1. Crank the engine and verify that fuel pump relay operation sound is heard.

2. If operation sound is not heard, inspect the following:

• Fuel pump relay

(See RELAY INSPECTION.)

• Wiring harness and connectors (Main relay - fuel pump relay - PCM terminal 1H (with immobilizer system), 1G (without immobilizer system)

Spark Test

1. Disconnect the fuel pump relay.

2. Verify that each ignition coil and connector is connected properly.

3. Inspect the ignition system in the following procedure.

Warning

• High voltage in the ignition system can cause strong electrical shock which can result in serious injury. Avoid direct contact to the vehicle body during the following spark test.

EGR Control System Inspection

1. Crank the engine and verify that EGR valve operation (initial operation) sound is heard.

• If the operation sound is not heard, connect the WDS or equivalent to the DLC-2 and verify that the DTC P0403 is shown. Perform DTC inspection. (See DTC TABLE [L8, LF, L3].)

2. Start the engine and idle it.

3. Warm up the engine to normal operating temperature.

4. Access the following PIDs:

• ECT, RPM, SEGRP_DSD, APP1, APP2, VSS

5. Idle the vehicle and verify that the SEGRP value is 0.

6. Put the vehicle in drive.

7. Depress the accelerator pedal and verify that the SEGRP_DSD value is increased.

• If the EGR valve increases, inspect the following:

- EGR valve (stuck open or close)

- Wiring harness and connectors (Main relay - EGR valve - PCM)

• If the SEGRP_DSD value does not increase, inspect the VSS, APP1, APP2, TP and ECT PIDs. (See PCM INSPECTION [L8, LF, L3].)

8. Stop the vehicle and verify that the SEGRP value returns to 0.

Purge Control System Inspection

1. Start the engine.

2. Disconnect the vacuum hose between the purge solenoid valve and the charcoal canister.

3. Put a finger to the purge solenoid valve and verify that there is no vacuum applied when the engine is cold.

• If there is a vacuum, inspect the following:

- Wiring harness and connectors (Purge solenoid valve-PCM terminal 2C)

- Purge solenoid valve

4. Warm up the engine to the normal operating temperature.

5. Stop the engine.

6. Connect the WDS or equivalent to the DLC-2 and verify that the DTC P0443 is shown. Perform DTC inspection. (See DTC TABLE [L8, LF, L3].)

7. Turn the ignition switch to the ON position.

8. Access ECT PID.

9. Verify that the engine coolant temperature is more than 78 °C {173 °F}.

• If the WDS or equivalent indicates less than 78 °C {173 °F}, perform the ECT sensor inspection.

10. Set the vehicle on the dynamometer or chassis roller.

Warning

• When the dynamometer or chassis roller is operating, there is a possibility that the operator may come into contact with or be caught up in the rotating parts, leading to serious injuries or death. When performing work while the dynamometer or chassis roller is operating, be careful not to come into contact with or be caught up in any of the rotating parts.

11. Drive vehicle at engine speed approx. 2,000 rpm for 30 s or more.

12. Put a finger to the purge solenoid valve and verify that there is no vacuum applied while step 2.

• If there is no vacuum, inspect the following:

- Wiring harness and connector (Main relay - purge solenoid valve - PCM terminal 2C)

- Purge solenoid valve

- MAF, APP1, APP2, TP and LOAD PIDs

• If there is vacuum, inspect the following:

- Vacuum hose (Purge solenoid valve - charcoal canister)

A/C Cut-off Control System Inspection

1. Start the engine.

2. Turn the A/C switch and the fan switch on.

3. Verify that the A/C compressor magnetic clutch actuates.

• If it does not actuate, go to symptom troubleshooting "No.23 A/C does not work sufficiently".

4. Fully open the throttle valve and verify that the A/C compressor magnetic clutch does not actuate for 2-5 s.

• If it actuates, inspect as follows:

- A/C relay

- Open or short to GND circuit in wiring harness and connectors (Ignition switch-A/C relay-PCM terminal 1I)

- A/C related parts

- APP1, APP2 PIDs

Cooling Fan Control System Inspection

European (L.H.D. U.K.) L8, LF and Australian LF specs.

Cooling fan system operation

1. Connect the WDS or equivalent to DLC-2.

2. Perform the KOEO or KOER self-test. (See KOEO/KOER SELF TEST [L8, LF, L3].)

3. Verify that the DTC P0117, P0118, P0480 and P0481 are not displayed.

4. If the DTC P0117, P0118, P0480 or P0481 is displayed, perform DTC inspection. (See DTC TABLE [L8, LF, L3].)

5. Verify that the ECT PID is below 100 °C {212 °F}.

6. Turn the A/C switch to OFF.

7. Turn the ignition switch to ON position.

8. Verify that the cooling fan and additional fan are not operating.

• If the cooling fan and additional fan operate, inspect for following:

- Short to GND circuit between A/C refrigerant pressure switch and PCM terminal 1AU

• If the cooling fan operates and the additional fan does not operate, inspect for following:

- Short to power between cooling fan relay and cooling fan motor

- Cooling fan relay (stuck close)

• If the cooling fan does not operate and the additional fan operates, inspect for following:

- Short to power between additional fan relay and additional fan motor

- Additional fan relay (stuck close)

9. Turn the ignition switch to OFF.

10. Disconnect the ECT sensor connector.

11. Turn the ignition switch to ON position.

12. Verify that the cooling fan and additional fan are operating.

• If the cooling fan and additional fan do not operates, inspect for following:

- Open circuit in wiring from battery positive post to cooling fan relay and additional fan relay (secondary power supply)

• If the cooling fan does not operates, inspect for following:

- Open circuit between cooling fan relay and cooling fan motor

- Open circuit between cooling fan motor and GND

- Cooling fan relay (stuck open)

• If the additional fan does not operates, inspect for following:

- Open circuit between additional fan relay and additional fan motor

- Open circuit between additional fan motor and GND

- Additional fan relay (stuck open)

13. Clear the DTC P0118 from PCM memory using the WDS or equivalent. (See AFTER REPAIR PROCEDURE [L8, LF, L3].)

European (L.H.D. U.K.) L3 and Australian L3 specs.

Cooling fan system operation

1. Connect the WDS or equivalent to DLC-2.

2. Perform the KOEO or KOER self-test. (See KOEO/KOER SELF TEST [L8, LF, L3].)

3. Verify that the DTC P0117, P0118, P0480 and P0481 are not displayed.

4. If the DTC P0117, P0118, P0480 or P0481 is displayed, perform DTC inspection. (See DTC TABLE [L8, LF, L3].)

5. Verify that the ECT PID is below 100 °C{212 °F}.

6. Turn the A/C switch to OFF.

7. Turn the ignition switch to ON position.

8. Verify that the cooling fan and additional fan are not operating.

• If the cooling fan No.1 and No.2 operate low speed, inspect for following:

- Cooling fan relay (stuck close)

• If the cooling fan No.1 and No.2 operate high speed, inspect for following:

- Short to GND circuit between A/C refrigerant pressure switch and PCM terminal 1AU

• If the cooling fan No.2 operates high speed, inspect for following:

- Cooling fan relay No.3 (stuck)

9. Start the engine and ECT PID above 100 °C{212 °F}.

10. Verify that the cooling fan No.1 and No.2 are operating low speed.

• If the cooling fan No.1 and No.2 do not operate, inspect for following:

- Cooling fan relay No.1 (stuck open)

- Open circuit (battery positive post - cooling fan relay No.1 - cooling fan motor No.1 - cooling fan relay No.3 - cooling fan motor No.2 - GND.)

• If the cooling fan No.1 operates high speed, inspect for following:

- Cooling fan relay No.2 (stuck close)

• If the cooling fan No.2 operates high speed, inspect for following:

- Cooling fan relay No.3 (stuck)

• If the cooling fan No.2 does not operate, inspect for following:

- Cooling fan relay No.2 (stuck close)

11. Turn the ignition switch to off.

12. Disconnect the ECT sensor connector.

13. Turn the ignition switch to ON position.

14. Verify that the cooling fan and additional fan are operating high speed.

• If the cooling fan No.1 does not operate, inspect for following:

- Cooling fan relay No.2 (stuck open)

- Open circuit between cooling fan relay No.2 and GND

• If the cooling fan No.2 does not operate, inspect for following:

- Cooling fan relay No.3 (stuck)

15. Clear the DTC P0118 from PCM memory using the WDS or equivalent. (See AFTER REPAIR PROCEDURE [L8, LF, L3].)

Intensely hot area and General specs.

Cooling fan system operation

*1 :

Intensely hot area and General (L.H.D.) specs.

*2 :

Except for intensely hot area and General (L.H.D.) specs.

1. Connect WDS or equivalent to DLC-2.

2. Verify that ECT PID is below cooling fan operating temperature.

3. Verify that the A/C switch and fan switch are off.

4. Start the engine and let it at idle.

5. Verify that the cooling fans fan are not operating.

• If the cooling fan is operating low speed, inspect for following:

- Short to GND circuit between PCM terminal 1M and cooling fan relay No.1

- Cooling fan relay No.1 stuck in closed position

• If the cooling fans are operating high speed, inspect for following:

- DTC for ECT sensor (P0117, P0118)

• If the cooling fan motor No.1 is not operating and cooling fan motor No.2 is operating, inspect for following:

- Short to GND circuit between PCM terminal 1R and cooling fan relay No.2

- Cooling fan relay No.2 stuck OFF

- Short to GND circuit between PCM terminal 1N and cooling fan relay No.4

- Cooling fan relay No.4 stuck OFF

6. Start the engine.

7. Verify that the cooling fans are operating low speed when ECT PID is above 100°C {212°F}.

• If the cooling fan motor No.1 does not operate, perform the following:

1. Select FAN3 PID.

2. Operate cooling fan relay No.1 by sending ON command.

3. Inspect the operation sound is heard from cooling fan relay No.1.

- If the operation sound is heard, inspect wiring harnesses, connectors and cooling fan motor No.1.

- If the operation sound is not heard, inspect cooling fan relay No.1 and open circuit between PCM terminal 1M and cooling fan relay No.1 wiring harness and connectors.

• Inspect the cooling fan is operating high speed, inspect the following:

- Short to GND circuit between PCM terminal 1R and cooling fan relay No.2/cooling fan relay No.3.

8. Turn A/C switch and fan switch are on.

9. Verify that the ACCS PID is ON.

• If the ACCS PID is not ON, inspect for following:

- A/C switch

- Fan switch

- Refrigerant pressure switch

- Open circuit PCM 1I related harnesses and connectors

10. Access the COLP PID.

11. Verify that the cooling fan motor No.1 is operating high speed and cooling fan motor No.2 is operating low speed, while the COLP PID is ON.

• If the cooling fan motor No.1 does not operate high speed, perform the following:

1. Select FAN1 PID.

2. Operate cooling fan relay No.2 and cooling fan relay No.3 by sending ON command.

3. Inspect the operation sound is heard from cooling fan relay No.2 and cooling fan relay No.3.

- If the operation sound is not heard from cooling fan relay No.3, inspect cooling fan relay No.3 and open circuit between PCM 1R and cooling fan relay No.3 wiring harnesses and connectors.

- If the operation sound is not heard from cooling fan relay No.2, inspect cooling fan relay No.2 and between PCM terminal 1R and cooling fan relay No.2 wiring harnesses and connector.

- If the operation sound is heard from cooling fan relay No.2 and cooling fan relay No.3, inspect wiring harnesses and connectors.

• If the cooling fan motor No.2 does not operate, perform the following:

- Inspect cooling fan motor No.2 and related wiring harnesses and connectors

• If the cooling fan motor No.2 does not operate, perform the following:

1. Select FAN2 PID.

2. Operate cooling fan relay No.4 by sending ON command.

3. Inspect the operation sound is heard from cooling fan relay No.4.

- If the operation sound is heard, inspect wiring harnesses and connectors.

- If the operation sound is not heard, inspect cooling fan relay No.4 and open circuit wiring harnesses and connectors between PCM terminal 1N and cooling fan relay No.4.

Variable Valve Timing Control System Operation Inspection [LF, L3]

When idling cannot be continued

1. Remove the oil control valve (OCV) and verify that the spool valve is at maximum retard position.

2. Connect the oil control valve (OCV).

3. Turn the ignition switch to the ON position.

4. Verify that the spool valve is at maximum retard position.

• If the spool valve is stuck in the advance direction, inspect for the following:

- Short circuit in wiring harnesses or connectors between the oil control valve (OCV) and the PCM.

5. Inspect the variable valve timing actuator. (See VARIABLE VALVE TIMING ACTUATOR INSPECTION [LF, L3]

When idling can be continued

1. Disconnect oil control valve (OCV) connector.

2. Warm up the engine and idle it.

3. Apply battery voltage to the oil control valve (OCV) and verify that the engine idles roughly or stalls.

• If the engine idles roughly or stalls, inspect the timing belt component (valve timing deviation).

• If the engine does not idle roughly or stalls, go to the next step.

4. Remove the oil control valve (OCV) and perform spool valve operation inspection.

(See OIL CONTROL VALVE (OCV) INSPECTION [LF, L3]

• If not as specified, inspect the following:

- Oil control valve (OCV)

- Harnesses and connectors between oil control valve (OCV) and PCM open or short.

• If as specified, inspect the following hydraulic passages for clogging or leakage or both:

- Oil pressure switch - oil control valve (OCV)

- Oil control valve (OCV) - camshaft

- Camshaft internal passage

5. If they are normal, replace the camshaft pulley (with built-in variable valve timing actuator).