Fuel Pump Control Module, Checking
Special tools and workshop equipment required
- Multimeter.
- Wiring diagram.
Test Requirements
- Fuse -SC1- OK.
- Fuse -S132- 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
-- Remove access cover beneath the carpet on the passenger side of the luggage compartment. Refer to LUGGAGE COMPARTMENT SIDE TRIM .
Checking voltage
Switch the ignition on.
-- Using a Multimeter, check the following wiring connection for voltage.
| Fuel Pump (FP) Control Module J538 Terminal | Measure to |
|---|---|
| 2 | B+ |
| 3 | Chassis Ground (GND) |
Specified value: Battery voltage
-- Switch the ignition off.
If the specified value was not obtained:
-- Check the Fuel Pump (FP) Control Module -J538- wiring harness terminal 3 to the Battery -- B (+) terminal for an open circuit or short to Ground (GND).
-- Check the Fuel Pump (FP) Control Module -J538- wiring harness terminal 2 to the B (+) terminal for an open circuit or short to B+.
-- Check the electrical harness connectors for damage, corrosion, loose or broken terminals.
-- If necessary, repair the wiring connection.
If no malfunctions are found in the wiring:
-- Switch the ignition on.
-- Using a Multimeter --, check the following wiring connection for voltage.
| Fuel Pump (FP) Control Module J538 Terminal | Measure to |
|---|---|
| 5 | Chassis Ground (GND) |
Specified value: about 5 V
-- Switch the ignition off.
If the specified value was not obtained:
-- Check the Fuel Pump (FP) Control Module -J538- wiring harness terminal 5 to the Engine Control Module (ECM) -J623- harness connector T94a, terminal 35 for an open circuit or short to Ground (GND).
-- Check for an open circuit or short to Ground (GND).
-- 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:
Checking Ground (GND)
-- Using a Multimeter --, check the Fuel Pump (FP) Control Module -J538- wiring harness terminal 4/31 to chassis ground for resistance.
| Fuel Pump (FP) Control Module J538 Terminal | Measure to |
|---|---|
| 4/31 | Chassis Ground (GND) |
Specified value: 1.5 Ω maximum.
If the specified value was not obtained:
-- Check the Fuel Pump (FP) Control Module -J538- 4/31 to ground connection 6 (main wiring harness) for an open circuit or a short to Battery (+).
-- 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 (FP) Control Module -J538-. Refer to Engine Mechanical, Repair Group 20.
-- Perform a road test to verify repair.
If the fault does not return:
Repair complete, Generate readiness code. Refer to READINESS CODE .
-- End diagnosis.
If the fault does return and no malfunction is detected in the wiring and the voltage supply was OK:
-- Replace the Engine Control Module (ECM) -J623-. Refer to ENGINE CONTROL MODULE, REPLACING .
-- Assembly is performed in the reverse of the removal.
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 .