DTC P1879 [WL-C, WE-C (MT)]

id0302a2801000

DTC P1879

RFW Free solenoid valve circuit/open
DETECTION CONDITION
•  Open circuit has been detected in the Free solenoid valve wiring harness.
POSSIBLE CAUSE
•  Free solenoid valve malfunction
•  Connector or terminal malfunction
•  Open circuit in wiring harness between Free solenoid valve terminal A and main relay
•  Open circuit in wiring harness between Free solenoid valve terminal B and PCM terminal 254
•  Short to ground in wiring harness between Free solenoid valve terminal B and PCM terminal 254
•  PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION
1
INSPECT FREE SOLENOID VALVE CONNECTOR FOR POOR CONNECTION
•  Turn the engine switch off.
•  Disconnect the Free solenoid 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 6.
No
Go to the next step.
2
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 6.
No
Go to the next step.
3
INSPECT FREE SOLENOID VALVE CIRCUIT FOR OPEN CIRCUIT
•  Turn the engine switch off.
•  Inspect for continuity between the following circuits:
―  Free solenoid valve terminal A (wiring harness-side) and main relay terminal D (wiring harness-side)
―  Free solenoid valve terminal B (wiring harness-side) and PCM terminal 254 (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 Step 6.
4
INSPECT FREE SOLENOID VALVE CIRCUIT FOR SHORT TO GROUND
•  Turn the engine switch off.
•  Inspect for continuity between the following circuits:
―  Free solenoid valve terminal A (wiring harness-side) and body ground
―  Free solenoid valve terminal B (wiring harness-side) and body ground
•  Is there continuity?
Yes
Repair or replace the wiring harness for a possible short to ground, then go to Step 6.
No
Go to the next step.
5
INSPECT FREE SOLENOID VALVE
•  Inspect the Free solenoid valve.
•  Is there any malfunction?
Yes
Replace the Free solenoid valve, then go to the next step.
No
Go to the next step.
6
VERIFY TROUBLESHOOTING OF DTC P1879 COMPLETED
•  Make sure to reconnect all disconnected connectors.
•  Clear the DTC from the PCM memory using the M-MDS.
•  Start the engine.
•  Shift the transfer select lever.
•  Is the same DTC present?
Yes
Replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION [WL-C, WE-C].)
(See PCM REMOVAL/INSTALLATION (U.K. Specs.) [WL-C, WE-C].)
No
Go to the next step.
7
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.)].)
(See DTC TABLE [WL-C, WE-C (Australian, European (L.H.D. U.K.) specs.)].)
No
Troubleshooting completed.