DTC P0627 [WL-C, WE-C (Thailand, General (L.H.D. R.H.D.) specs.)]

id0102b0955100

DTC P0627

Fuel metering valve control circuit open
DETECTION CONDITION
•  The PCM monitors the fuel metering valve driver IC temperature in the PCM and the control voltage while the engine is running. If either of the following conditions is met, the PCM determines that there is a malfunction in the fuel metering valve range/performance.
―  The PCM monitors the fuel metering valve driver IC temperature in the PCM. If the fuel metering valve driver IC temperature is more than 150 °C {320 °F} during the fuel metering valve operation, the PCM determines that the fuel metering valve has a malfunction
―  The PCM monitors the fuel metering valve control voltage at the PCM terminals. If fuel metering valve control voltage is less than 5 V when fuel metering valve is not operating, the PCM determines that the fuel metering valve has a malfunction (open circuit)
POSSIBLE CAUSE
•  Fuel metering valve malfunction
•  Connector or terminal malfunction
•  Open circuit in wiring harness between fuel metering valve terminal A and main relay
•  Open circuit in wiring harness between fuel metering valve terminal B and PCM terminal 179
•  PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION
1
VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
•  Has FREEZE FRAME DATA been recorded?
Yes
Go to the next step.
No
Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2
VERIFY RELATED REPAIR INFORMATION AVAILABILITY
•  Verify related service repair information availability.
•  Is any related repair information available?
Yes
Perform repair or diagnosis according to the available repair information.
•  If the vehicle is not repaired, go to the next step.
No
Go to the next step.
3
VERIFY CURRENT SIGNAL STATUS: IS CONCERN INTERMITTENT OR CONSTANT?
•  Connect the M-MDS to the DLC-2.
•  Clear the DTC from the PCM memory using the M-MDS.
•  Run the vehicle under the FREEZE FRAME DATA stored condition.
•  Is the same DTC present?
Yes
Go to the next step.
No
Intermittent concern exists.
Perform the “INTERMITTENT CONCERNS TROUBLESHOOTING”.
(See INTERMITTENT CONCERN TROUBLESHOOTING [WL-C, WE-C].)
4
INSPECT FUEL METERING VALVE CONNECTOR FOR POOR CONNECTION
•  Turn the engine switch off.
•  Disconnect the fuel metering valve connector.
•  Inspect for poor connection (such as damaged/pulled-out pins, and corrosion).
•  Is there any malfunction?
Yes
Repair or replace the terminal, then go to Step 9.
No
Go to the next step.
5
INSPECT FUEL METERING VALVE CONTROL CIRCUIT FOR OPEN CIRCUIT
•  Turn the engine switch to the ON position (Engine off).
•  Measure the voltage between fuel metering valve terminal A (wiring harness-side) and body ground
•  Is the voltage B+?
Yes
Go to the next step.
No
Repair or replace the wiring harness for a possible open circuit, then go to Step 9.
6
INSPECT FUEL METERING VALVE
•  Inspect the fuel metering valve.
•  Is there any malfunction?
Yes
Repair the supply pump, then go to Step 9.
(See SUPPLY PUMP REMOVAL/INSTALLATION [WL-C, WE-C].)
No
Go to the next step.
7
INSPECT PCM CONNECTOR FOR POOR CONNECTION
•  Turn the engine switch off.
•  Disconnect the PCM connector.
•  Inspect for poor connection (such as damaged/pulled-out pins, and corrosion).
•  Is there any malfunction?
Yes
Repair or replace the terminal, then go to Step 9.
No
Go to the next step.
8
INSPECT FUEL METERING VALVE CONTROL CIRCUIT FOR OPEN CIRCUIT
•  Turn the engine switch off.
•  Inspect for continuity between fuel metering valve terminal B (wiring harness-side) and PCM terminal 179 (wiring harness-side)
•  Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness for a possible open circuit, then go to the next step.
9
VERIFY TROUBLESHOOTING OF DTC P0627 COMPLETED
•  Turn the engine switch off.
•  Make sure to reconnect all disconnected connectors.
•  Turn the engine switch to the ON position (Engine off).
•  Clear the DTC from the memory using the M-MDS.
•  Run the vehicle under the FREEZE FRAME DATA stored condition.
•  Is the same DTC present?
Yes
Replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION [WL-C, WE-C].)
No
Go to the next step.
10
VERIFY AFTER REPAIR PROCEDURE
•  Perform the “After Repair Procedure“.
•  Are any DTCs present?
Yes
Go to the applicable DTC troubleshooting.
(See DTC TABLE [WL-C, WE-C (Thailand, General (L.H.D. R.H.D.) specs.)].)
No
Troubleshooting completed.