Nissan Maxima Service and Repair Manual: Vehicle speed signal circuit

Description

Combination meter sends vehicle speed signal to power steering control unit.

Diagnosis Procedure

1.PERFORM COMBINATION METER SELF-DIAGNOSIS

Perform combination meter self-diagnosis.

2.CHECK HARNESS BETWEEN COMBINATION METER AND POWER STEERING CONTROL UNIT FOR OPEN

1. Turn the ignition switch OFF.
2. Disconnect combination meter connector.
3. Disconnect power steering control unit connector.
4. Check continuity between combination meter connector M24 (A)
   terminal 30 and power steering control unit connector M59 (B)
   terminal 8.

3.CHECK HARNESS BETWEEN COMBINATION METER AND POWER STEERING CONTROL UNIT FOR SHORT

1. Check continuity between combination meter connector M24
   terminal 30 and ground.
2. Turn ignition switch ON.
3. Check voltage between combination meter connector M24 terminal
   30 and ground.

4.CHECK VEHICLE SPEED SIGNAL (COMBINATION METER SIDE)

1. Turn the ignition switch OFF.
2. Connect combination meter connector.
3. Check combination meter input/output standard values.

5.CHECK VEHICLE SPEED SIGNAL (POWER STEERING CONTROL UNIT SIDE)

1. Turn the ignition switch OFF.
2. Connect power steering control unit connector.
3. Start the engine.
4. Check signal between power steering control unit connector
   M59 terminal 8 and ground with oscillosco

6.CHECK TERMINALS AND HARNESS CONNECTORS

1. Check power steering control unit pin terminals for damage or loose connection with harness connector.
2. Check combination meter pin terminals for damage or loose connection with harness connector.