P1818

P1818 ACTUATOR POSITION SWITCH

Description
The actuator position switch detects the current actuator motor range. DTC P1818 will set if either of the following occur:
^ Improper signal from actuator position switch is input due to open or short circuit.
^ Malfunction is detected in actuator position switch.

DTC Logic

P1818:

DTC CONFIRMATION PROCEDURE

1. DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Perform self-diagnosis.
Is DTC P1818 detected?
YES >> Perform diagnosis procedure. Refer to "Diagnosis Procedure".
NO >> Inspection End.

Diagnosis Procedure

1. CHECK ACTUATOR 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 SHIFT POS SW1 and SHIFT POS SW2.

Without CONSULT-III
1. Start engine.

2. Check voltage between transfer control unit harness connector terminal and ground.
Are the inspection results normal?
YES >> GO TO 5.
NO >> GO TO 2.

2. CHECK HARNESS BETWEEN TRANSFER CONTROL UNIT AND ACTUATOR POSITION SWITCH
1. Turn ignition switch OFF. (Stay for at least 5 seconds.)
2. Disconnect transfer control unit harness connector and the transfer control device (actuator position switch) harness connector.

3. Check continuity between the following terminals.
- Transfer control unit harness connector E143 terminal 27 and transfer control device (actuator position switch) harness connector F58 terminal 23.
- Transfer control unit harness connector E143 terminal 44 and transfer control device (actuator position switch) harness connector F58 terminal 20.
Continuity should exist.
Also check harness for short to ground and short to power.
Are the 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 transfer control device (actuator position switch) harness connector.

3. Check continuity between transfer control device (actuator position switch) harness connector F58 terminal 22 and ground.
Continuity should exist.
Also check harness for short to ground and short to power.
Are the 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 ACTUATOR POSITION SWITCH
1. Remove transfer control device.

2. Check operation by applying battery voltage to transfer control device (actuator motor) terminals 21 and 24.

CAUTION:
^ Do not operate actuator motor for more than 1 second.
^ Change the actuator motor position to HIGH when installing.
^ Be careful not to overheat the harness.

Are the inspection results normal?
YES >> GO TO 5.
NO >> Replace transfer control device (actuator motor).

5. CHECK TRANSFER CONTROL UNIT
Check transfer control unit input/output signal. Refer to DLN-79, "Reference Value". Reference Value
Are the 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
Perform the self-diagnosis, after driving a vehicle for a while.
Are the inspection results normal?
YES >> Inspection End.
NO >> Replace transfer control device.

Component Inspection
1. Remove transfer control device.