P1814

P1814 Wait Detection Switch

Description

The wait detection switch detects if the transfer case is in 4WD. DTC P1814 will set if an improper signal from the wait detection switch is input due to open or short circuit.

DTC Logic

DTC Detection Logic






DTC Confirmation Procedure

1. DTC CONFIRMATION PROCEDURE

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

Is DTC P1814 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 WAIT DETECTION SWITCH SIGNAL

With SDT

1 Start engine.
2 Select "Data list" mode for "4WD" with SDT.
3 Read out the value of "WAIT DETCT SW".






Without SDT

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 WAIT DETECTION SWITCH

1 Turn ignition switch "OFF". (Stay for at least 5 seconds.)
2 Disconnect transfer control unit harness connector and the wait detection switch harness connector.
3 Check continuity between transfer control unit harness connector M152 terminal 17 and wait detection switch harness connector F59 terminal 10.











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 Disconnect wait detection switch harness connector.
3 Check continuity between wait detection switch harness connector F59 terminal 11 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 WAIT DETECTION SWITCH

1 Turn ignition switch "OFF". (Stay for at least 5 seconds.)
2 Disconnect wait detection switch harness connector.
3 Remove wait detection switch. Refer to [4WD System: Component Parts Location] Locations.
4 Push and release wait detection switch and check continuity between wait detection switch terminals 10 and 11.











Are the inspection results normal?
YES
GO TO 5.
NO
Replace wait detection switch.

5. 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 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 "DTC check".

Is DTC P1814 displayed?
YES
Replace transfer control unit. Refer to [Transfer Control Unit: Removal and Installation] Service and Repair.
NO
Inspection End.

Component Inspection

1) Turn ignition switch "OFF". (Stay for at least 5 seconds.)
2) Disconnect wait detection switch harness connector.
3) Remove wait detection switch. Refer to [4WD System: Component Parts Location] Locations.
4) Push and release wait detection switch and check continuity between wait detection switch terminals 10 and 11.











5) If the inspection results are abnormal replace the wait detection switch.