XB147 - Power to Pump Circuit: Intermittent Short to Ground

- Key "OFF".

- Visually check the power-to-pump circuit from the Variable Control Relay Module (VCRM) to the fuel pump, the Fuel Pump Monitor (FPM) circuit to the Powertrain Control Module (PCM) and the power-to-pump circuit to the High Speed Fuel Pump (HFP) relay.

- Start engine.

CAUTION: While performing this test, do not touch any moving/hot engine parts.

- Check for engine stall/stumble while performing the following test. If possible, listen for the fuel pump turning off.

- A fuel pressure gauge could also be installed and monitored.

- The VCRM Failure Mode Effects Management (FMEM) will turn the fuel pump off if a short to ground is detected.

- Shake, wiggle, bend the power-to-pump circuit from the VCRM to the fuel pump, PCM and HFP relay.

- Lightly tap on the Inertia Fuel Shutoff Switch, Fuel Pump, HFP relay and VCRM (to simulate road shock).

- Key "OFF".

- Is a fault indicated?

Yes -- Isolate fault and service as necessary. Clear continuous memory (Diagnostic Trouble Code (DTC) 583 should have been set). Clearing Diagnostic Trouble Codes

Start engine, wait seconds. Key "OFF". Rerun quick test. Quick Test Appendix (Detailed Testing Instructions)

No -- Go to XB148. XB148 - Power to Pump Circuit: Intermittent Short to Ground