DTC P1887


id030200800300

DTC
P1887
4WD solenoid circuit
DETECTION CONDITION
•  Current detection circuit in 4WD CM detects current above specification for more than specified period.
•  4WD CM detects that 4WD solenoid control signal differs from current detected at current detection circuit for more than specified period.
•  Relay voltage detection circuit detects that voltage does not concur with relay ON/OFF signal for more than specified period.
POSSIBLE CAUSE
•  4WD solenoid malfunction
•  Open circuit or short to GND between 4WD CM terminal O and 4WD solenoid terminal B
•  Open circuit or short to GND between 4WD CM terminal P and 4WD solenoid terminal A
•  ENG B+ (10A) fuse malfunction
•  Open circuit or short to GND in harness between battery and 4WD CM terminal K
•  Open or short circuit in 4WD CM internal circuit
•  4WD CM malfunction
•  Poor connection of connectors (female terminals)

Diagnostic procedure

STEP

INSPECTION

ACTION

1
INSPECT 4WD SOLENOID TO 4WD CM (POWER SUPPLY CIRCUIT) FOR OPEN CIRCUIT
•  Disconnect the 4WD CM connector.
•  Disconnect the 4WD solenoid connector.
•  Inspect for continuity between the 4WD CM terminal O (harness-side) and the 4WD solenoid terminal B (harness-side).
•  Is there continuity?
Yes
Go to the next step.
No
Repair or replace the harness for open circuit between the 4WD CM and the 4WD solenoid, then go to Step 7.
2
INSPECT 4WD SOLENOID TO 4WD CM (POWER SUPPLY CIRCUIT) FOR SHORT TO GROUND
•  Inspect for continuity between the 4WD CM terminal O (harness-side) and ground.
•  Is there continuity?
Yes
Repair or replace the harness for short to ground between the 4WD CM and the 4WD solenoid, then go to Step 7.
No
Go to the next step.
3
INSPECT 4WD SOLENOID TO 4WD CM (GROUND CIRCUIT) FOR OPEN CIRCUIT
•  Inspect for continuity between the 4WD CM terminal P (harness-side) and the 4WD solenoid terminal A (harness-side).
•  Is there continuity?
Yes
Go to the next step.
No
Repair or replace the harness for open circuit between the 4WD CM and the 4WD solenoid, then go to Step 7.
4
INSPECT 4WD SOLENOID TO 4WD CM (GROUND CIRCUIT) FOR SHORT TO GROUND
•  Inspect for continuity between the 4WD CM terminal P (harness-side) and ground.
•  Is there continuity?
Yes
Repair or replace the harness for short to ground between the 4WD CM and the 4WD solenoid, then go to Step 7.
No
Go to the next step.
5
INSPECT 4WD SOLENOID CONDITION
•  Inspect the 4WD solenoid.
•  Is it normal?
Yes
Go to the next step.
No
Replace the coupling component, then go to Step 7.
6
INSPECT FUSE CONDITION
•  Is the ENG B+ (10A) fuse normal?
Yes
Go to the next step.
No
Replace the fuse, then go to Step 9.
7
INSPECT 4WD CM POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT
•  Measure voltage between the 4WD CM terminal K (harness-side) and ground.
•  Is voltage B+?
Yes
Go to the next step.
No
Repair or replace the harness for open circuit between the 4WD CM and the battery, then go to next step.
8
INSPECT 4WD CM GROUND CIRCUIT FOR OPEN CIRCUIT
•  Inspect for continuity between the 4WD CM terminal N (harness-side) and ground.
•  Is there continuity?
Yes
Go to the next step.
No
Repair or replace the harness for open circuit between the 4WD CM and ground, then go to next step.
9
VERIFY TROUBLESHOOTING COMPLETED
•  Make sure to reconnect all disconnected connectors.
•  Clear DTC from memory.
•  Drive vehicle.
•  Is the same DTC present?
Yes
Replace the 4WD CM, then go to next step.
No
Go to the next step.
10
VERIFY AFTER REPAIR PROCEDURE
•  Is there any other DTC present?
Yes
Go to applicable DTC inspection.
No
Troubleshooting completed.