Leak Detection Pump Checking

Leak Detection Pump Checking

Special tools, testers and auxiliary items required

• Multimeter.

• Wiring diagram.

Test requirements

• Fuse (SB38) OK.

• The ignition switched off.

• Voltage for the Leak Detection Pump (LDP) (V144) is supplied by the Power Supply Relay (terminal 30, B+) (J317).

Test procedure

- Perform a preliminary check to verify the customers complaint. Refer to => [ Preliminary Check ] Preliminary Check.

Start diagnosis

- Remove right rear wheel housing liner. Refer to the Repair Information.

- Disconnect the Leak Detection Pump (LDP) (V144) electrical harness connector - 2 -.





Checking internal resistance

- Using a multimeter, check the Leak Detection Pump (LDP) (V144) for resistance as follows:










If the specifications were Not obtained:

- Replace the Leak Detection Pump (LDP) (-V144-).

If the specified values were obtained:

Checking voltage supply

- Using a multimeter, check the Leak Detection Pump (LDP) (-V144-) electrical harness connector terminal 3 to Ground for voltage.










- Operate the starter briefly.

Specified value: Battery voltage.

- Switch the ignition Off.

If the specified value was Not obtained:

- Check the wiring connection from the Leak Detection Pump (LDP) (-V144-) electrical harness connector terminal 3 to the Power Supply Relay (terminal 30, B+) (J317) terminal 87 for an open circuit, a short circuit to Battery positive or to Ground.

- Check the electrical harness connector for damage, corrosion, loose or broken terminals.

- If necessary, repair the wiring connection.

If the specified value was obtained:

Checking output wiring

If the manufacturers test box is being used. Perform the following step.

- Install the test box.

If the manufacturers test box is not being used. Perform the following step.

- Remove the Engine Control Module (ECM) (J623). Refer to the Repair Information.

- Using a multimeter, check the Leak Detection Pump (LDP) (V144) electrical connector terminals to Engine Control Module (ECM) (J623) electrical connector T121 for resistance.










Specified value: 1.5 ohms.

If the specifications were Not obtained:

- Check the wiring for an open circuit, high resistance, short circuit to Battery positive or Ground.

- Check the electrical harness connector for damage, corrosion, loose or broken terminals.

- If necessary, repair the wiring connection.

If no malfunction is found in wiring:

- Erase the DTC memory. Refer to => [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Modes 01 - 09.

- Perform a road test to verify repair.

If the DTC does not return:

Generate readiness code. Refer to => [ Readiness Code ] Monitors, Trips, Drive Cycles and Readiness Codes.

If the DTC returns, no malfunction is found in the wiring and voltage supply was OK:

- Replace the Engine Control Module (ECM) (J623). Refer to the Repair Information.

- Assembly is performed in the reverse of the removal.

Final procedures

After repair work, the following work steps must be performed in the following sequence:

1. Check the DTC memory. Refer to => [ Diagnostic Mode 03 - Read DTC Memory ] Diagnostic Modes 01 - 09.

2. If necessary, erase the DTC memory. Refer to => [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Modes 01 - 09.

3. If the DTC memory was erased, generate readiness code. Refer to => [ Readiness Code ] Monitors, Trips, Drive Cycles and Readiness Codes.