Checking Components And Wiring
Check the fuel pump (FP) and combustion preheater module (CPM) connectors. Check for contact resistance and oxidation.
Check the cable between combustion preheater module (CPM) terminal #13 and fuel pump (FP) terminal 2. Check for an intermittent open-circuit. Check for an intermittent short-circuit to ground.
Check the cable between combustion preheater module (CPM) terminal #11 and water pump terminal 1. Check for an intermittent open-circuit.
Remedy as necessary.
Other information
- see CONNECTING THE BREAKOUT BOX
- see SIGNAL SPECIFICATION
- see FUEL PUMP AUXILIARY HEATER, REPLACING
- see CHECKING WIRING AND TERMINALS
- Continue
Refer to VERIFICATION
Check the fuel pump (FP) and combustion preheater module (CPM) connectors. Check for contact resistance and oxidation. Remedy as necessary Check for damage in particular.
Measure between the overheat protection thermostat terminals using an ohmmeter. The resistance must be approximately 0 Ω.
The overheat protection thermostat must be replaced if the value is not correct.
Check the cable between combustion preheater module (CPM) terminal #13 and fuel pump (FP) terminal 2. Check for an open-circuit. Check for an short-circuit to ground.
Check the cable between combustion preheater module (CPM) terminal #11 and fuel pump terminal 1. Check for an open-circuit.
The fuel pump (FP) must be replaced if no faults are found in the cable.
Diagnostic trouble code (DTC) CEM-5F3B and/or diagnostic trouble code (DTC) CEM-5F3D may also be stored if there is a fault in the power cable.
Remedy as necessary.
Other information
- see CONNECTING THE BREAKOUT BOX
- see SIGNAL SPECIFICATION
- see OVERHEAT PROTECTION THERMOSTAT / FLAME SENSOR / ENGINE COOLANT TEMPERATURE SENSOR, REPLACING
- see FUEL PUMP AUXILIARY HEATER, REPLACING
- see CHECKING WIRING AND TERMINALS
- Continue
Refer to VERIFICATION