P1810
P1810 NEUTRAL-4LO SWITCHDescription
The NEUTRAL-4LO switch detects that the transfer case is in neutral or 4LO range. DTC P1810 will set when an improper signal from the NEUTRAL-4LO switch is input due to an open or short circuit.
DTC Logic
P1810:
DTC CONFIRMATION PROCEDURE
1. DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Perform self-diagnosis.
Is DTC P1810 displayed?
YES >> Perform diagnosis procedure. Refer to "Diagnosis Procedure".
NO >> Inspection End.
Diagnosis Procedure
1. CHECK 4LO POSITION SWITCH SIGNAL
With CONSULT-III
1. Start engine.
2. Select DATA MONITOR mode for ALL MODE AWD/4WD with CONSULT-III.
3. Read out the value of N POSI SW TF.
Without CONSULT-III
1. Start engine.
2. Check voltage between transfer control unit harness connector terminal and ground.
Are inspection results normal?
YES >> GO TO 5.
NO >> GO TO 2.
2. CHECK HARNESS BETWEEN TRANSFER CONTROL UNIT AND NEUTRAL-4LO SWITCH
1. Turn ignition switch OFF. (Stay for at least 5 seconds.)
2. Disconnect transfer control unit harness connector and the neutral-4LO switch harness connector.
3. Check continuity between transfer control unit harness connector E143 terminal 25 and neutral-4LO switch harness connector F60 terminal 13.
Continuity should exist.
Also check harness for short to ground and short to power.
Are inspection results normal?
YES >> GO TO 3.
NO >> Repair or replace damaged parts.
3. CHECK GROUND CIRCUIT
1. Turn ignition switch OFF. (Stay for at least 5 seconds.)
2. Disconnect neutral-4LO switch harness connector.
3. Check continuity between neutral-4LO switch harness connector F60 terminal 12 and ground.
Continuity should exist.
Also check harness for short to ground and short to power.
Are inspection results normal?
YES >> GO TO 4.
NO >> Repair open circuit or short to ground or short to power in harness or connectors.
4. CHECK 4LO SWITCH
1. Turn ignition switch OFF.
2. Disconnect neutral-4LO switch harness connector.
3. Remove neutral-4LO switch.
4. Push and release NEUTRAL-4LO switch and check continuity between NEUTRAL-4LO switch terminals 12 and 13.
Are inspection results normal?
YES >> GO TO 5.
NO >> Replace NEUTRAL-4LO switch.
5. CHECK TRANSFER CONTROL UNIT
Check transfer control unit input/output signal. Refer to DLN-79, "Reference Value". Reference Value
Are inspection results normal?
YES >> GO TO 6.
NO >> Check transfer control unit pin terminals for damage or loose connection with harness connector. If any items are damaged, repair or replace damaged parts.
6. CHECK DTC
Drive the vehicle and then perform self-diagnosis.
Are inspection results normal?
YES >> Inspection End.
NO >> Replace transfer control unit.
Component Inspection
1. Turn ignition switch OFF. (Stay for at least 5 seconds.)
2. Disconnect NEUTRAL-4LO switch harness connector.
3. Remove NEUTRAL-4LO switch.
4. Push and release NEUTRAL-4LO switch and check continuity between NEUTRAL-4LO switch terminals 12 and 13.
5. If the inspection results are abnormal replace the NEUTRAL-4LO switch.