Leak Detection Pump, Checking

Special tools and workshop equipment required 

• Multimeter.
• EVAP Smoke Machine
• Wiring diagram.

Test requirements 

• The ignition switched 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. Refer to the Repair information.

--

-- 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

If any of the specified values were Not obtained:

-- Replace the Leak Detection Pump (LDP) --V144--. Refer to the Repair information.

If the specified values were obtained:

Checking voltage supply 

-- Using a multimeter, check the Leak Detection Pump (LDP) --V144-- electrical harness connector terminal 3 for voltage. Connect the negative lead to engine ground.

-- Start the engine.

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 3 to Fuse SB7. Refer to Wiring Diagrams for pin locations.

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 voltage was obtained:

Checking wiring 

-- 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 terminals for an open circuit or high resistance. Refer to Wiring Diagrams for pin locations.

Leak Detection Pump (LDP) --V144-- electrical harness connector terminal	Engine Control Module (ECM) -J623- electrical connector T94 terminal or test box socket
1	40
2	10

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 no malfunction is found in wiring and the voltage supply was OK:

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

Assembly is performed in the reverse order of the removal, note the following:

-- Install the right rear wheel housing liner. Refer to the Repair information.

Final procedures 

After the 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 .
2. If necessary, erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .
3. If the DTC memory was erased, generate readiness code. Refer to READINESS CODE .