DTC 54

Fig. 096 - Wiring Diagram for Code 54 Fuel Pump Relay Circuit. VIN P:

CODE 54

FUEL PUMP CIRCUIT

(LOW VOLTAGE)

2.0L "J" SERIES

FUEL INJECTION (TBI)

Fig. 095 Code 54 Fuel Pump Relay Circuit:

When the key is first turned on without the engine running, the ECM will turn the fuel pump relay on for two seconds. This builds up the fuel pressure When the key is first turned on without the engine running, the ECM will turn the fuel pump relay on for two seconds. This builds up the fuel pressure quickly. If the engine is not started within two seconds, the ECM will shut the fuel pump off. As soon as the engine is cranking, ECM will turn the relay on quickly. If the engine is not started within two seconds, the ECM will shut thefuel pump off. As soon as the engine is cranking, ECM will turn the relay on and run the fuel pump.
As a backup system to the fuel pump relay, the fuel pump can also be turned on by the oil pressure switch. The oil pressure switch is a normally open switch that closes when oil pressure reaches about 27.58 kPa (4 psi). If the fuel pump relay fails, the oil pressure switch will run the fuel pump.
An inoperative fuel pump relay can result in long cranking times, particularly if the engine is cold. The oil pressure switch will turn on the fuel pump, however, there is an extended crank time caused by the time necessary for oil pressure to reach 27.58 kPa (4 psi) and close switch.
When the ignition switch is turned on, the ECM terminal B2 looks for voltage on pump circuit 120 for .2 seconds. If voltage is not present, it will set Code 54 and turn on the "CHECK ENGINE" light after engine starts.