Leak Detection Pump, Checking

Special tools and workshop equipment required 

• Multimeter.
• Wiring diagram.

Test requirements 

• The Leak Detection Pump (LDP) -V144- fuse is OK.
• 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 -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- to -3-	640 to 720 Ω
-2- to -3-	15 to 17 Ω

If any of the specifications are Not obtained:

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

If the specified values are obtained:

Checking voltage supply 

-- Check the Leak Detection Pump (LDP) --V144-- for voltage.

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

-- Turn the ignition switch ON.

Specified value: Battery voltage.

-- Switch the ignition OFF.

If the specified value was Not obtained:

-- Remove fuse in Fuse Panel B. Using a multimeter, check the Leak Detection Pump (LDP) --V144-- wiring from terminal 3 to fuse in Fuse Panel B. Refer to Wiring Diagrams for fuse number.

Specified value: Wire resistance max 1.5 Ω.

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:

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 terminal 1 to Engine Control Module (ECM) -J623- electrical connector T94 terminal 44 for an open circuit or high resistance.

-- Using a multimeter, check the Leak Detection Pump (LDP) --V144-- electrical connector terminal 2 to Engine Control Module (ECM) -J623- electrical connector T94 terminal 49 for an open circuit or high resistance.

Specified value: 1.5 Ω max.

If the specification was Not obtained:

-- Check the wiring for a short circuit to Battery positive, 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 values were obtained and no wiring faults are present:

-- 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 .