Fuel Pump Control Module, Checking
Special tools and workshop equipment required
- multimeter
- Wiring diagram.
Test requirements
- Fuse -SC3- 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 (FP) Control Module J538 Terminal | Measure to |
|---|---|
| T5f/4 | B+ |
| T5f/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 T5f/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 T5f/4 to GND 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 |
|---|---|
| T5f/3 | Chassis Ground (GND) |
Specified value: about 12.5 V
-- Switch the ignition off.
If the specified value was not obtained:
-- Check the Fuel Pump (FP) Control Module -J538- wiring harness terminal T5f/3 to fuse SC 3 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 T5f/5 to T94/76 for resistance.
| Fuel Pump (FP) Control Module J538 Terminal | Measure to Engine Control Module (ECM) -J623- |
|---|---|
| T5f/5 | T94/76 |
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 (FP) Control Module -J538-. Refer to the appropriate service information.
-- 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 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 .