PNP Switch (M/T)

P1816 PNP Switch (M/T)

Description

The M/T PNP switch signals neutral position to the transfer control unit. DTC P1816 will set when the M/T PNP switch signal is malfunctioning.

DTC Logic

DTC Detection Logic






DTC Confirmation Procedure

1. DTC CONFIRMATION PROCEDURE

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

Is DTC P1816 displayed?
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. CHECK PARK/NEUTRAL POSITION SWITCH SIGNAL

1 Turn ignition switch ON.
2 Check voltage between transfer control unit harness connector M152 terminal 33 and ground.











Is the inspection result normal?
YES
GO TO 5.
NO
GO TO 2.

2. CHECK HARNESS BETWEEN TRANSFER CONTROL UNIT AND PARK/NEUTRAL POSITION SWITCH

1 Turn ignition switch OFF. (Stay for at least 5 seconds.)
2 Disconnect transfer control unit harness connector and the park/neutral position switch harness connector.
3 Check continuity between transfer control unit harness connector M152 terminal 33 and park/neutral position switch harness connector F66 terminal 1.











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

Is the inspection result 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 park/neutral position switch harness connector.
3 Check continuity between park/neutral position switch harness connector F66 terminal 2 and ground.











Also check harness for short to power.

Is the inspection result normal?
YES
GO TO 4.
NO
Repair open circuit or short to power in harness or connectors.

4. CHECK PARK/NEUTRAL POSITION SWITCH

1 Turn ignition switch OFF. (Stay for at least 5 seconds.)
2 Remove park/neutral position switch. Refer to [4WD System: Component Parts Location] .
3 Push and release park/neutral position switch and check continuity between park/neutral position switch terminals 1 and 2.











Is the inspection result normal?
YES
GO TO 5.
NO
Replace park/neutral position switch. Refer to [4WD System: Component Parts Location] .

5. CHECK TRANSFER CONTROL UNIT

Check transfer control unit input/output signal. Refer to [Transfer Control Unit: Reference Value] .

Is the inspection result normal?
YES
Inspection End.
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.

Component Inspection

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











5) If NG, replace the neutral position switch.