Signal Too Low - Intermittent Fault

ECM-2400 FUEL PUMP (FP) RELAY
SIGNAL TOO LOW - INTERMITTENT FAULT

Checking component and wiring



Check the cable between engine control module (ECM) # B45 (# B55) and fuel pump (FP) relay base # 4 for an intermittent short-circuit to ground according to [1][2]Checking Wiring and Terminals. Intermittent Faults

Check the cable between engine control module (ECM) #B45 (#B55) and fuel pump (FP) relay base #4 for an intermittent open-circuit according to [1][2]Checking Wiring and Terminals. Intermittent Faults

Other information
- Connecting the breakout box/accessing the control module, Connecting the Breakout Box (ECM)
- To access/replace the fuel pump (FP) relay, Replacing Relay In Engine Compartment Central Electrical Unit
- For information about signals, see Diagnostic Parameters and Pinout Values. Signal Description, ME7, B5XX4T


Fault-tracing information
If the fault is intermittent, do not verify fault-tracing if the fault does not recur.