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METERING OIL PUMP SWITCH INSPECTION

BHE014014600W01

  Caution

  • This inspection procedure cannot be completed correctly if the stepping motor which is built into the metering oil pump has a malfunction. Before performing the inspection, verify that any one of the DTCs (P1685, P1686, P1687, P1688) related to the stepping motor is not detected.

  Note

  • Before performing the following inspection, make sure to follow the troubleshooting flowchart. (See Troubleshooting Procedure.)

## Voltage Inspection

  Note

  • This inspection procedure is performed using the metering oil pump learning function as one of the PCM learning functions.

1. Make preparations for the PCM terminal voltage measurement. (See PCM INSPECTION.)

2. To clear the metering oil pump control learning value, disconnect the negative battery terminal.

3. Verify that the voltage at PCM terminal 2N is as indicated in the table.

  • If it cannot be verified even though the related wiring harnesses have no malfunction, replace the metering oil pump. (See METERING OIL PUMP REMOVAL/INSTALLATION.)

Measurement condition | PCM terminal 2N (V)
--- | ---
Ignition switch ON | 0
Just after engine start | B+
Idling after engine start | 0

## Circuit Open/Short Inspection

1. Disconnect the PCM connectors.

2. Disconnect the metering oil pump switch connector.

3. Inspect the following wiring harnesses for open or short circuit. (Continuity inspection)

### Open circuit

  • If there is no continuity in the following wiring harnesses, there is an open circuit. Repair or replace the wiring harness.
  – Metering oil pump switch terminal A and PCM terminal 2N
  – Metering oil pump switch terminal C and PCM terminal 1U

### Short circuit

  • If there is continuity in the following wiring harnesses, there is a short circuit. Repair or replace the wiring harness.
  – Metering oil pump switch terminal A and body ground
  – Metering oil pump switch terminal A and power supply