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. →
- 66 EXTERIOR EQUIPMENT
- 66 - EXTERIOR EQUIPMENT for BODY EXTERIOR - CABRIOLET
- 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) V144 electrical harness connector terminals | Specified values |
|---|---|
| - 1 - + - 3 - | 640 to 720 Ω |
| - 2 - + - 3 - | 15 to 17 Ω |
If any of the specifications are not obtained:
- Replace the Leak Detection Pump (LDP) -V144-. → 20 - FUEL SUPPLY SYSTEM .
If the specified values are obtained:
Checking voltage supply
- 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) -V144- electrical harness connector terminal | Measure to |
|---|---|
| - 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. Refer to → 24 - FUEL INJECTION SYSTEM .
If the manufacturers test box is not being used. Perform the following step.
- Remove the Engine Control Module (ECM) J623. Refer to → Engine Control Module (ECM) J623 , Removing and Installing .
- 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) -V144- electrical harness connector terminals | Engine Control Module (ECM) J623 electrical connector T94 terminals or test box sockets |
|---|---|
| - 1 - | 20 |
| - 2 - | 24 |
Specified value: 1.5 Ω 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. Refer to → Engine Control Module (ECM) J623 , Removing and Installing .
- Install the rear engine cover - arrows -.
Final procedures
After the repair work, the following work steps must be performed in the following sequence:
- Check the DTC memory.
- If necessary, erase the DTC memory. Refer to Diagnostic Mode 04: Reset/delete Diagnostic Data .
- If the DTC memory was erased, generate readiness code. Refer to Readiness Code .
- End of diagnosis.