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

DTC Detection Logic






DTC Confirmation Procedure

1. DTC CONFIRMATION PROCEDURE

1 Turn ignition switch ON.
2 Perform "DTC check".

Is DTC P1818 detected?
YES
Perform diagnosis procedure. Refer to "Diagnosis Procedure".
NO
Inspection End.

Diagnosis Procedure

Regarding Wiring Diagram information, refer to [Transfer Control Unit: Wiring Diagram] [1][2]Electrical Diagrams.

1. CHECK ACTUATOR POSITION SWITCH SIGNAL

With SDT

1 Start engine.
2 Depress brake pedal and stop vehicle.
3 Set A/T selector lever to "N" position.
4 Select "Data list" mode for "4WD" with SDT.
5 Read out the value of "SHIFT POS SW1", "SHIFT POS SW2", "SHIFT POS SW3", "SHIFT POS SW4".






Without SDT

1 Start engine.
2 Depress brake pedal and stop vehicle.
3 Set A/T selector lever to "N" position.
4 Check voltage between transfer control unit harness connector terminal and ground.











Are the inspection results normal?
YES
GO TO 4.
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 M152 terminal 10 and transfer control device (actuator position switch) harness connector F58 terminal 26.
- Transfer control unit harness connector M152 terminal 11 and transfer control device (actuator position switch) harness connector F58 terminal 20.
- Transfer control unit harness connector M152 terminal 12 and transfer control device (actuator position switch) harness connector F58 terminal 21.
- Transfer control unit harness connector M152 terminal 13 and transfer control device (actuator position switch) harness connector F58 terminal 25.






Also check harness for short to ground and short to power.

Is there continuity?
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 Check continuity between transfer control device (actuator position switch) harness connector F58 terminal 22 and ground.











Also check harness for short to power.

Is there continuity?
YES
GO TO 4.
NO
Repair open circuit or short to power in harness or connectors.

4. CHECK TRANSFER CONTROL UNIT

Check transfer control unit input/output signal. Refer to [Transfer Control Unit: Reference Value] Pinout Values and Diagnostic Parameters.

Are the inspection results normal?
YES
GO TO 5.
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.

5. CHECK DTC

Perform the "DTC check", after driving a vehicle for a while.

Is DTC P1818 displayed?
YES
Replace transfer control device. Refer to [Transfer Control Device: Removal and Installation] Service and Repair.
NO
Inspection End.