Fuel Pump (FP) Control Module, Checking

Fuel Pump (FP) Control Module, Checking

Recommended special tools and equipment
- VAG1526 multimeter or VAG1715 multimeter
- VAG1527 voltage test lamp
- VAG1594 connector test kit
- Wiring diagram

Test requirements







- Corresponding fuses on fuse holder in instrument panel, right side, for Fuel Pump (FP) Control Module -J538- must be OK.

NOTE: Fuses on this fuse holder are labelled "SD" in the wiring diagram.

- Battery voltage must be at least 11.5 Volts.
- All electrical consumers such as, lights and rear window defroster must be switched off.
- Ground (GND) connections between engine and chassis must be OK.
- Ignition switched off.

Test sequence
Observe safety precautions.
Observe rules for cleanliness.

- Remove seat bench.







- Disconnect 10-pin connector -arrow- from Fuel Pump (FP) Control Module -J538-

Checking voltage supply







- Connect multimeter with test leads to terminals 1 and 6 connector for voltage measurement (terminal 30).

Specified value: at least 11.5V

If specified value is not obtained:
- Locate and repair open circuit using wiring diagram:
- Erase DTC memory of Engine Control Module (ECM). Diagnostic Mode 04 - Erase DTC Memory
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes

If specified value is obtained:







- Connect multimeter with test leads to terminals 3 and 6 connector for voltage measurement (terminal 15).
- Switch ignition on.

Specified value: at least 11.5V
- Switch ignition off.

If specified value is not obtained:
- Locate and repair open circuit using wiring diagram:
- Erase DTC memory of Engine Control Module (ECM). Diagnostic Mode 04 - Erase DTC Memory
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes

If there is no malfunction in voltage supply:
- Check wire to Engine Control Module (ECM) according to wiring diagram.

Checking wire to Engine Control Module (ECM)
- Connect test box to 94-pin connector of wiring harness. Test Box, Connecting For Wiring Test

Engine Control Module (ECM) is not connected.







- Check wire between test box and 10-pin connector to Engine Control Module (ECM) for open circuit according to wiring diagram.

Terminal 2 + socket 27

Wire resistance: max. 3.0 Ohms

- Check wire for short circuit to B+ and to Ground (GND).

Specified value: Infinity Ohms

- Erase DTC memory of Engine Control Module (ECM). Diagnostic Mode 04 - Erase DTC Memory
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes

If no malfunction is detected in wiring and if voltage supply was OK:
- Replace Fuel Pump (FP) Control Module -J538-.
- Erase DTC memory of Engine Control Module (ECM). Diagnostic Mode 04 - Erase DTC Memory
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes