Faulty Signal

Faulty signal

Checking the function of the glow plug




- Ignition on.

Note! It is important that only the ignition is on in order for the heater to start.

- Activate the heater.
Check the heater function.

Other information
- Engine coolant heater, test running





Is the heater working?

Yes - Checking components and wiring

No - Checking components and wiring

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Verification





Verification

Hint: After carrying out the repair, check that the fault has been remedied.








- Ignition off
- Reinstall the connectors, components etc.
- Ignition on
- Read off the engine coolant temperature.

Note! It is important that only the ignition is on in order for the heater to start.

- Activate the heater.

Hint: After repair, the voltage of the flame sensor can be checked. The voltage must be a maximum of 1.0 V.

Check the heater function.

Caution! In order for to enable start of the heater itself, the battery voltage must be normal, coolant temperature must be lower than +96 °C and the heater's after-run/stop sequence must be finished. There must also be enough fuel in the tank.

Caution! If the heater or other components are not activated, try closing down the activation window and then starting the activation again with the symbol for VCT2000.

Other information:
- Engine coolant heater, test running .





Is the heater working?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFIED - FAULT FOUND

VERIFICATION FAILED - Fault-tracing information

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Fault-tracing information

Attempt New Test - Checking the function of the glow plug

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Checking components and wiring
Check the electrical terminal for the glow plug and the combustion preheater module (CPM) connector. Check for contact resistance and oxidation. Check for damage in particular.
Check the cable between combustion preheater module (CPM) terminal #1 and the glow plug terminal. Check for an open-circuit. Check for a short-circuit to ground. Check for a short-circuit to supply voltage.
Replace the glow plug if no fault is found in the cable.
Remedy as necessary.

Other information
- Connecting the breakout box
- Signal specification
- Glow plug engine coolant heater, replacing
- Checking wiring and terminals Checking Wiring And Terminals









Continue - Verification

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Checking components and wiring
Check the electrical terminal for the glow plug and the combustion preheater module (CPM) connector. Check for contact resistance and oxidation. Check for loose connections.
Check the cable between combustion preheater module (CPM) terminal #1 and the glow plug terminal. Check for an intermittent open-circuit. Check for an intermittent short-circuit to ground. Check for an intermittent short-circuit to supply voltage.
Remedy as necessary.

Other information
- Connecting the breakout box
- Signal specification
- Glow plug engine coolant heater, replacing
- Checking wiring and terminals Checking Wiring And Terminals










Continue - Verification

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