Leak Detection Pump (LDP) V144, Checking
Special tools, testers and auxiliary items required
- Multimeter.
- Wiring diagram.
Test requirements
- The Leak Detection Pump (LDP) V144 fuse OK.
- The ignition switched off.
Procedure
- Remove the left rear wheel housing liner.
- 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:
Leak Detection Pump (LDP) Specified
V144 electrical harness values
connector terminals
- 1 - + - 3 - 640 to 720 Ohms
- 2 - + - 3 - 15 to 17 Ohms
If any of the specifications are not obtained:
- Replace the Leak Detection Pump (LDP) -V144-.
If the specified values are obtained:
Checking voltage supply
NOTE: The voltage for the Leak Detection Pump (LDP) -V144- is supplied by the Engine Component Power Supply Relay J757.
- Using a Multimeter, check the Leak Detection Pump (LDP) -V144- electrical harness connector terminal 3 to Ground (GND) for voltage.
Leak Detection Pump (LDP) Measure to
-V144- electrical harness
connector terminal
- 3 - Engine Ground (GND)
- Operate the starter briefly.
Specified value: battery voltage.
- Switch the ignition off.
If the specified value was not obtained:
- Using a Multimeter, check the Leak Detection Pump (LDP) -V144- electrical harness connector terminal 3 to the Engine Component Power Supply Relay J757 terminal 2/87 for resistance.
Specified value: 1.5 Ohms
If the specified value was not obtained:
- Check the wiring for a short circuit to Ground (GND) or an open circuit.
- Check the electrical harness connector for damage, corrosion, lose or broken terminals.
- If necessary, repair the faulty wiring connection.
If no malfunction is detected in the wiring and if the voltage supply was OK:
Checking 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.
- Using a Multimeter, check the Leak Detection Pump (LDP) -V144- electrical connector terminal 1 to Engine Control Module (ECM) J623 electrical connector T94 terminal 20 for an open circuit.
- Using a Multimeter, check the Leak Detection Pump (LDP) -V144- electrical connector terminal 2 to Engine Control Module (ECM) J623 electrical connector T94 terminal 24 for an open circuit.
Leak Detection Pump (LDP) - Engine Control Module (ECM) J623
V144- electrical harness electrical connector T94 terminals
connector terminals or test box sockets
- 1 - 20
- 2 - 24
Specified value: 1.5 Ohms max.
If the specification was not obtained:
- Check the wiring for a short circuit to Battery positive (+), or an open circuit.
- Check the electrical harness connector for damage, corrosion, lose or broken terminals.
- If necessary, repair the faulty wiring connection.
If no malfunction is found in wiring:
- Replace the Engine Control Module (ECM) J623.
- Install the rear engine cover - arrows - .
Final procedures
After the repair work, the following work steps must be performed in the following sequence:
1. Check the DTC memory. Diagnostic Mode 03 - Read DTC Memory
2. If necessary, erase the DTC memory. Diagnostic Mode 04 - Erase DTC Memory
3. If the DTC memory was erased, generate readiness code.
- End of diagnosis.