Leak Detection Pump, Checking
Special tools and workshop equipment required
- Multimeter.
- EVAP Smoke Machine
- Wiring diagram.
Test requirements
- The fuses OK.
- Switch the ignition Off.
Test procedure
-- Perform a preliminary check to verify the customers complaint. Refer to PRELIMINARY CHECK
Start diagnosis
-- Remove the right rear wheel housing liner.
--
-- Disconnect the Leak Detection Pump (LDP) -V144- electrical harness connector.
Checking internal resistance
-- Using a multimeter, check the Leak Detection Pump (LDP) -V144- for resistance as follows:
| Leak Detection Pump (LDP) -V144- electrical connector terminals | Specified values |
|---|---|
| 1 to 2 | 134 to 153 Ω |
| 1 to 3 | 134 to 153 Ω |
| 1 to 4 | 99 to 118 Ω |
If any of the specified values were Not obtained:
-- Replace the Leak Detection Pump (LDP) --V144--.
If the specified values were obtained:
Checking voltage supply
-- Check the Leak Detection Pump (LDP) --V144-- for voltage.
-- Switch the ignition On.
-- Using a multimeter, check the Leak Detection Pump (LDP) --V144-- electrical harness connector terminal 4 for voltage and connect the negative lead to engine ground.
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-- wiring from terminal 4 to fuse.
Specified value: 1.0 Ω max.
If the specified value was Not obtained:
-- Check the wiring for high resistance, short to ground or an open circuit.
-- Check the electrical harness connector for damage, corrosion, loose or broken terminals.
-- If necessary, repair the faulty wiring connection.
If the specified value was obtained:
Checking wiring
-- Remove the Engine Control Module (ECM) -J623-.
-- Using a multimeter, check the Leak Detection Pump (LDP) --V144-- electrical connector terminals to Engine Control Module (ECM) -J623- electrical connector terminals for an open circuit or high resistance.
| Leak Detection Pump (LDP) --V144-- electrical harness connector terminal | Engine Control Module (ECM) -J623- electrical connector T94 terminal. |
|---|---|
| 1 | 28 |
| 2 | 25 |
| 3 | 9 |
Specified value: 1.0 Ω max.
If the specified value was Not obtained:
-- Check the wiring for high resistance or an open circuit.
-- Check the electrical harness connector for damage, corrosion, loose or broken terminals.
-- If necessary, repair the faulty wiring connection.
If the specified value was obtained:
If no malfunction is found in wiring and the voltage supply was OK:
-- Replace the Engine Control Module (ECM) -J623-.
Final procedures
Assembly is performed in the reverse order of the removal, note the following:
-- Install the right rear wheel housing liner.
After the repair work, the following work steps must be performed in the following sequence:
- Check the DTC memory. Refer to DIAGNOSTIC MODE 03 - READ DTC MEMORY .
- If necessary, erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .
- If the DTC memory was erased, generate readiness code. Refer to READINESS CODE .