Leak Detection Pump Checking

Special tools and workshop equipment required 

• Multimeter.
• Wiring diagram.

Test requirements 

• Fuse -SB38- OK.
• The ignition switched off.

Test procedure 

-- Perform a preliminary check to verify the customers complaint. Refer to PRELIMINARY CHECK .

Start diagnosis 

-- Remove 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 connector terminals	Specified value
1 to 3	640 to 720 Ω
2 to 3	15 to 17 Ω

If the specifications were Not obtained:

-- Replace the Leak Detection Pump (LDP) --V144--.

If the specified values were obtained:

Checking voltage supply 

-- Using a multimeter, check the Leak Detection Pump (LDP) --V144-- electrical harness connector terminal 3 to Ground for voltage.

Leak Detection Pump (LDP) --V144-- electrical harness connector terminal	Measure to
3	Engine Ground

-- Operate the starter briefly.

Specified value: Battery voltage.

-- Switch the ignition Off.

If the specified value was Not obtained:

-- Check the wiring connection from the Leak Detection Pump (LDP) --V144-- electrical harness connector terminal 3 to the Power Supply Relay (terminal 30, B+) -J317- terminal 87 for an open circuit, a short circuit to Battery positive or to Ground.

-- Check the electrical harness connector for damage, corrosion, loose or broken terminals.

-- If necessary, repair the wiring connection.

If the specified value was obtained:

Checking output 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-. 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 T121 for resistance.

Leak Detection Pump (LDP) -V144- electrical connector terminals	Engine Control Module (ECM) -J623- electrical connector T121 terminals or test box socket
1	80
2	25

Specified value: 1.5 Ω.

If the specifications were Not obtained:

-- Check the wiring for an open circuit, high resistance, short circuit to Battery positive or Ground.

-- Check the electrical harness connector for damage, corrosion, loose or broken terminals.

-- If necessary, repair the wiring connection.

If no malfunction is found in wiring:

-- Erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .

-- Perform a road test to verify repair.

If the DTC does not return:

Generate readiness code. Refer to READINESS CODE .

If the DTC returns, no malfunction is found in the wiring and voltage supply was OK:

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

-- Assembly is performed in the reverse of the removal.

Final procedures 

After 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 .