Fuel Pump Control Module -J538-, CHECKING

Special tools and workshop equipment required

Multimeter
Wiring diagram

Test Requirements

Fuses OK.
Battery voltage at least 12.5 volts.
All electrical consumers such as, lights and rear window defroster, switched off.
Vehicles with automatic transmission, selector lever in position "P" or "N".
A/C switched off.
Ground (GND) connections between engine/transmission/chassis OK.
Ignition switched off.

Test Procedure

-- Perform a preliminary check to verify the customer's complaint. Refer to PRELIMINARY CHECK

Start diagnosis

-- Remove rear seat assembly. Refer to the appropriate service information.

Checking voltage

Switch the ignition on.

-- Using a multimeter, check the following wiring connection for voltage.

Fuel Pump Control Module -J538- Terminal	Measure to
12	Chassis Ground (GND)

Specified value: Battery voltage

-- Switch the ignition off.

If the specified value was not obtained:

-- Check the Fuel Pump Control Module -J538- wiring harness terminal 12 to theTerminal 30 Power Supply Relay -J317- terminal 8/87 for an open circuit or short to Ground (GND).

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

-- If necessary, repair the wiring connection.

Checking Ground (GND)

-- Using a multimeter, check the Fuel Pump (FP) Control Module -J538- wiring harness terminal 4 to T91/21 for resistance.

Fuel Pump Control Module -J538- Terminal	Engine Control Module -J623- electrical harness connector T91 terminals
4	21

Specified value: 1.5 Ω maximum.

If the specified value was not obtained:

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

-- If necessary, repair the wiring connection.

If no malfunctions are found in the wiring and the voltage supply was OK:

-- Replace theFuel Pump Control Module -J538-. Refer to the appropriate service information.

-- Perform a road test to verify repair.

If the fault does not return:

Generate readiness code. Refer to READINESS CODE .

If the fault does return and no malfunction is detected in the wiring and the voltage supply was OK:

-- Replace the Engine Control Module -J623-. Refer to the appropriate service information.

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

Final Procedures

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 .