Signal Too High / Signal Missing

Signal too high / Signal missing

Checking components and wiring
Check the signal cable for the relay for the electric engine block heater. Check between accessory control module terminal #B5 and the connector for the relay. Check for a short-circuit to supply voltage. Check for an open-circuit.
Check the ground lead for the relay for the electric engine block heater. Check between accessory control module terminal #B4 and the connector for the relay. Check for an open-circuit.
Remedy as necessary.

Other information:
- To connect the breakout box, see Connecting the breakout box. Accessory electronic module Connecting the Breakout Box, Accessory Electronic Module (AEM)
- To access or replace the Accessory Electronic Module (AEM) and connector, see Accessory electronic module (AEM), replacing Accessory Electronic Module (AEM)
- For information about signals, see Signal description. Accessory electronic module (AEM) Signal Description, Accessory Electronic Module (AEM)
- To access and replace the relay for the electric engine block heater, see Relay electrical engine block heater, replacing Service and Repair
- To fault-trace wiring and terminals see Checking wiring and terminals Checking Wiring And Terminals










Continue - Verification

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Verification




Verification

Verification

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








- Ignition off
- Reconnect the components, connectors etc.
- Ignition on.
Check the function of the electric engine block heater.

Does the system function?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFIED - Fault Found

VERIFICATION FAILED - Fault-tracing information

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Fault-tracing information




Information

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.

Do you want to exit fault-tracing?

Yes - FAULT-TRACING FAILED

No - Attempt New Test

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FAULT-TRACING FAILED - FAULT-TRACING FAILED

Attempt New Test - Checking components and wiring

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