Signal Too High - Permanent Fault

ECM-2400 FUEL PUMP (FP) RELAY
SIGNAL TOO HIGH - PERMANENT FAULT

Checking wiring and components



Check the cable between engine control module (ECM) #B45 (#B55) and fuel pump (FP) relay base #4 for a short-circuit to supply voltage according to [1][2]Checking Wiring and Terminals. Permanent Fault

Remedy as necessary.

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


Verification



Hint: After carrying out the repair, check that the fault has been remedied.
- Ignition off.
- Reconnect connectors, reinstall components etc.
- Ignition on.
Activate the fuel pump (FP) relay and check that the fuel pump (FP) starts.

Does the fuel pump (FP) start?
Yes - Testing Complete.
No - Continue below.


Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed. Exit fault tracing for this diagnostic trouble code (DTC) or make another attempt.