Diagnostic procedure
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STEP
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INSPECTION
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ACTION
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1
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VERIFY FREEZE FRAME DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAS BEEN RECORDED
• Has FREEZE FRAME DATA been recorded?
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Yes
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Go to the next step.
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No
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Record the FREEZE FRAME DATA on the repair order, then go to the next step.
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2
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VERIFY RELATED REPAIR INFORMATION AVAILABILITY
• Verify related Service Information availability.
• Is any related Service Information available?
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Yes
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Perform repair or diagnosis according to the available Service information.
If the vehicle is not repaired, go to the next step.
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No
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Go to the next step.
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3
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VERIFY RELATED PENDING CODE OR STORED DTCS
• Turn the ignition switch to off, then to the ON position (Engine off).
• Verify related pending code or stored DTCs.
• Are other DTCs present?
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Yes
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If misfire the DTC is present, go to Step 8.
If other DTCs is present, go to the applicable DTC inspection.
(See DTC TABLE [L3 Turbo].)
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No
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If driveability concern is present, go to Step 8.
If not, go to the next step.
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4
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IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA
• Is DTC P2178 on FREEZE FRAME DATA?
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Yes
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Go to the next step.
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No
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Go to troubleshooting procedures for DTC on FREEZE FRAME DATA.
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5
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VERIFY CURRENT INPUT SIGNAL STATUS (IGNITION SWITCH TO THE ON POSITION/IDLE)
• Access the APP1, APP2, ECT, MAF, TP and VSS PIDs using the WDS or equivalent.
• Is there any signal that is far out of specification when the ignition switch is at the ON position and the engine runs?
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Yes
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Inspect the sensor and excessive resistance in related wiring harnesses.
Repair if necessary.
Then go to Step 19.
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No
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Go to the next step.
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6
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VERIFY CURRENT INPUT SIGNAL STATUS UNDER TROUBLE CONDITION
• Inspect the same PIDs as Step 5 while simulating FREEZE FRAME DATA condition.
• Is there any signal which causes drastic changes?
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Yes
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Inspect the sensor and related wiring harnesses, repair or replace it.
Then go to Step 19.
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No
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Go to the next step.
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7
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VERIFY CURRENT INPUT SIGNAL STATUS OF A/F SENSOR
• Access the O2S11 for P2177 PID using the WDS or equivalent.
• Check the PID under following accelerator pedal condition in NEUTRAL.
• Is the PID reading normal?
- -0.1-0.1 A when idle - More than 0.25 mA just after release of accelerator pedal (lean condition) |
Yes
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Go to the next step.
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No
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Visually inspect for any gas leakage between the exhaust manifold and the A/F sensor.
Then go to Step 19.
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8
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VERIFY CURRENT INPUT SIGNAL STATUS OF MAF SENSOR
• Connect the WDS or equivalent to the DLC-2
• Start the engine.
• Access the MAF PID.
• Verify that the MAF PID changes quickly according to engine speed.
• Is the PID normal?
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Yes
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Go to the next step.
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No
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Replace the MAF/IAT sensor, then go to Step 19.
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9
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INSPECT PURGE SOLENOID OPERATION
• Perform the Purge Control System Inspection.
• Does the purge control system work properly?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning part according to inspection result, then go to Step 19.
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10
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INSPECT PCV VALVE OPERATION
• Inspect the PCV valve operation.
• Is the PCV valve normal?
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Yes
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Go to the next step.
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No
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Replace the PCV valve, then go to Step 19
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11
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INSPECT EGR VALVE OPERATION
• Perform the EGR Control System Inspection.
• Does the EGR control system work properly?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning part according to inspection result, then go to Step 19.
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12
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INSPECT VARIABLE SWIRL CONTROL OPERATION
• Perform the Variable Swirl Control Operation Inspection.
• Does the variable swirl control work properly?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning part according to inspection result, then go to Step 19.
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13
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INSPECT VARIABLE VALVE TIMING CONTROL SYSTEM OPERATION
• Inspect the variable valve timing control system operation.
• Does the variable valve timing control system work properly?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning part according to inspection results, then go to Step 19.
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14
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INSPECT FUEL PRESSURE (HIGH-SIDE)
• Access and monitor FUEL_PRES PID.
• Is the FUEL_PRES PID value within the specified?
(See Using the WDS or Equivalent.)
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Yes
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Go to Step 18.
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No
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Go to the next step.
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15
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IDENTIFY CAUSE BY FUEL PRESSURE SENSOR OR HIGH PRESSURE FUEL PUMP
• Is the vehicle accelerate performance normally?
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Yes
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Go to the next step.
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No
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Go to Step 17.
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16
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INSPECT FUEL PRESSURE SENSOR
• Inspect the fuel pressure sensor.
• Is the fuel pressure sensor normal?
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Yes
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Go to the next step.
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No
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Replace the fuel delivery pipe, then go to Step 19.
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17
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INSPECT HIGH PRESSURE FUEL PUMP
• Replace the high pressure fuel pump
• Monitor FUEL_PRES PID
• Is the FUEL_PRES PID value within the specified?
(See Using the WDS or Equivalent.)
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Yes
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Go to Step 19.
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No
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Go to the next step.
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18
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INSPECT FUEL PRESSURE (LOW-SIDE)
• Connect the fuel pressure gauge between fuel pump and high pressure fuel pump.
• Measure the low side fuel pressure.
• Is the low side fuel pressure within the specified?
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Yes
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Go to the next step.
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No
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Inspect for following:
• Fuel line restriction
• Fuel filter clogging
If okay replace the fuel pump. Then go to the next step.
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19
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VERIFY TROUBLESHOOTING OF DTC P2178 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear the DTC from the PCM memory using the WDS or equivalent.
• Perform the PCM Adaptive Memory Produce Drive Mode.
(See OBD DRIVE MODE [L3 Turbo].)
• Is the PENDING CODE for this DTC present?
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Yes
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Replace the PCM, then go to the next step.
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No
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Go to the next step.
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20
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VERIFY AFTER REPAIR PROCEDURE
• Perform the "AFTER REPAIR PROCEDURE".
• Are any DTCs present?
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Yes
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Go to the applicable DTC inspection.
(See DTC TABLE [L3 Turbo].)
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No
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Troubleshooting completed.
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