P1231

Fuel Pump Relay Output Open Circuit Or Short To Ground

P1231 - Fuel pump relay.: Short circuit to ground.

Possible causes:
1. MS43 ECM C331, Engine fusebox connectors C575.
2. Open circuit C331/10 (BP) - C575/9 (BP).
3. Short circuit C575/9 (BP) - Ground.
4. Fuel pump relay.
5. MS43 ECM.

1. MS43 ECM C331, Engine fusebox connectors C575.
CONNECTOR
Check for connector not correctly latched, backed out pins, damaged pins, corroded pins

2. Open circuit C331/10 (BP) - C575/9 (BP).
OPEN_CIRCUIT
Check resistance > 1M Ohms.

3. Short circuit C575/9 (BP) - Ground.
SHORT_CIRCUIT
Check resistance < 5.0 Ohms.

4. Fuel pump relay.
No detail available for this fault

5. MS43 ECM.
No detail available for this fault