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DTC P0186:00 [PCM (SKYACTIV-X)]

id0102u9202400

Outline

Description

High fuel temperature sensor control correlation problem

Detection condition

•  The output value from the high fuel temperature sensor and the output value from the low fuel temperature sensor are compared and a correlation error occurs.

Preconditions

•  Battery voltage: 8 V or more^*1

•  5 min elapse after engine start

•  The following DTC is not detected:

―  High fuel temperature sensor: P0187:00, P0188:00

―  Low fuel temperature sensor: P0182:00, P0183:00

^*1: Standard can be verified by displaying PIDs using M-MDS

Fail-safe function

•  Inhibits the SPCCI control with a large amount of intake air introduced (lean A/F).

Possible cause

•  High fuel pressure sensor/high fuel temperature sensor connector or terminals malfunction

•  PCM connector or terminals malfunction

•  High fuel temperature sensor malfunction

•  Low fuel temperature sensor malfunction

•  PCM malfunction

System wiring diagram

•  Not applicable

Connector diagram

•  Not applicable

Description	High fuel temperature sensor control correlation problem
Detection condition	• The output value from the high fuel temperature sensor and the output value from the low fuel temperature sensor are compared and a correlation error occurs. Preconditions • Battery voltage: 8 V or more^1 • 5 min elapse after engine start • The following DTC is not detected: ― High fuel temperature sensor: P0187:00, P0188:00 ― Low fuel temperature sensor: P0182:00, P0183:00 ^1: Standard can be verified by displaying PIDs using M-MDS
Fail-safe function	• Inhibits the SPCCI control with a large amount of intake air introduced (lean A/F).
Possible cause	• High fuel pressure sensor/high fuel temperature sensor connector or terminals malfunction • PCM connector or terminals malfunction • High fuel temperature sensor malfunction • Low fuel temperature sensor malfunction • PCM malfunction
System wiring diagram	• Not applicable
Connector diagram	• Not applicable

Diagnostic Procedure

Step

Inspection

Results

Action

1

RECORD VEHICLE STATUS WHEN DTC WAS DETECTED TO UTILIZE WITH REPEATABILITY VERIFICATION

•  Record the freeze frame data/snapshot data.

Note

•  Recording can be facilitated using the screen capture function of the PC.

—

Go to the next step.

2

INSPECT HIGH FUEL PRESSURE SENSOR/HIGH FUEL TEMPERATURE SENSOR CONNECTOR FOR MALFUNCTION

•  Inspect the applicable connector and terminal.
(See CONNECTOR INSPECTION.)

•  Are the connector and terminal normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

3

INSPECT PCM CONNECTOR FOR MALFUNCTION

•  Inspect the applicable connector and terminal.
(See CONNECTOR INSPECTION.)

•  Are the connector and terminal normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

4

INSPECT HIGH FUEL TEMPERATURE SENSOR FOR MALFUNCTION

•  Inspect the applicable part.
(See HIGH FUEL TEMPERATURE SENSOR INSPECTION [SKYACTIV-X 2.0].)

•  Is the part normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

(See FUEL DISTRIBUTOR REMOVAL/INSTALLATION [SKYACTIV-X 2.0].)

5

INSPECT LOW FUEL TEMPERATURE SENSOR FOR MALFUNCTION

•  Inspect the applicable part.
(See LOW FUEL TEMPERATURE SENSOR INSPECTION [SKYACTIV-X 2.0].)

•  Is the part normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

(See HIGH PRESSURE FUEL PUMP REMOVAL/INSTALLATION [SKYACTIV-X 2.0].)

Repair completion verification 1

VERIFY THAT VEHICLE IS REPAIRED

•  Install/connect the part removed/disconnected during the troubleshooting procedure.

•  Clear the DTC recorded in the memory.
(See CLEARING DTC.)

•  Replicate the vehicle conditions at the time the DTC was detected using the following procedure.

―  Start the engine and idle it. (Engine cold)

―  Drive the vehicle on flat roads 10 times under the following conditions.

•  Maintain the condition of the vehicle speed of 25 km/h {16 mph} for 25 s while in 2nd gear.

•  Stop the vehicle and idle the engine.

•  Perform the DTC inspection for the PCM.
(See DTC INSPECTION.)

•  Is the same Pending DTC present?

Yes

Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.

(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].)

If the CAN communication is normal, perform the diagnosis from Step 1.

•  If the malfunction recurs, replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION [SKYACTIV-X 2.0].)

No

Go to the next step.

Repair completion verification 2

VERIFY IF OTHER DTCs DISPLAYED

•  Perform the DTC inspection.
(See DTC INSPECTION.)

•  Are any other DTCs displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

No

DTC troubleshooting completed.

Step	Inspection	Results	Action
1	RECORD VEHICLE STATUS WHEN DTC WAS DETECTED TO UTILIZE WITH REPEATABILITY VERIFICATION • Record the freeze frame data/snapshot data. Note • Recording can be facilitated using the screen capture function of the PC.	—	Go to the next step.
2	INSPECT HIGH FUEL PRESSURE SENSOR/HIGH FUEL TEMPERATURE SENSOR CONNECTOR FOR MALFUNCTION • Inspect the applicable connector and terminal. (See CONNECTOR INSPECTION.) • Are the connector and terminal normal?	Yes	Go to the next step.
2		No	Repair or replace the malfunctioning location and perform the repair completion verification.
3	INSPECT PCM CONNECTOR FOR MALFUNCTION • Inspect the applicable connector and terminal. (See CONNECTOR INSPECTION.) • Are the connector and terminal normal?	Yes	Go to the next step.
3		No	Repair or replace the malfunctioning location and perform the repair completion verification.
4	INSPECT HIGH FUEL TEMPERATURE SENSOR FOR MALFUNCTION • Inspect the applicable part. (See HIGH FUEL TEMPERATURE SENSOR INSPECTION [SKYACTIV-X 2.0].) • Is the part normal?	Yes	Go to the next step.
4		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See FUEL DISTRIBUTOR REMOVAL/INSTALLATION [SKYACTIV-X 2.0].)
5	INSPECT LOW FUEL TEMPERATURE SENSOR FOR MALFUNCTION • Inspect the applicable part. (See LOW FUEL TEMPERATURE SENSOR INSPECTION [SKYACTIV-X 2.0].) • Is the part normal?	Yes	Go to the next step.
5		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See HIGH PRESSURE FUEL PUMP REMOVAL/INSTALLATION [SKYACTIV-X 2.0].)
Repair completion verification 1	VERIFY THAT VEHICLE IS REPAIRED • Install/connect the part removed/disconnected during the troubleshooting procedure. • Clear the DTC recorded in the memory. (See CLEARING DTC.) • Replicate the vehicle conditions at the time the DTC was detected using the following procedure. ― Start the engine and idle it. (Engine cold) ― Drive the vehicle on flat roads 10 times under the following conditions. • Maintain the condition of the vehicle speed of 25 km/h {16 mph} for 25 s while in 2nd gear. • Stop the vehicle and idle the engine. • Perform the DTC inspection for the PCM. (See DTC INSPECTION.) • Is the same Pending DTC present?	Yes	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].) If the CAN communication is normal, perform the diagnosis from Step 1. • If the malfunction recurs, replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [SKYACTIV-X 2.0].)
Repair completion verification 1		No	Go to the next step.
Repair completion verification 2	VERIFY IF OTHER DTCs DISPLAYED • Perform the DTC inspection. (See DTC INSPECTION.) • Are any other DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting.
Repair completion verification 2		No	DTC troubleshooting completed.