Signal Too High. Permanent Fault

Signal too high. Permanent fault

Checking connectors








- Ignition off
- Check climate control module connector B (16-pin) for contact resistance and oxidation.
Check for damage carefully
- Reinstall the components, reconnect the connectors etc.
- Ignition on
- Read off the engine coolant temperature (ECT).
Check that the engine coolant temperature (ECT) reading is correct. Compare with the engine coolant temperature.
If the engine coolant temperature (ECT) is now OK, the fault was caused by poor contact in the connectors.

Other information:
- To remove the climate control module, see Comfort module Removal and Replacement
- Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault





Is the temperature reading OK?

Yes - FAULT FOUND

No - Checking components and wiring

-------------------------------------------------

Checking components and wiring
Check the resistance of the engine coolant temperature (ECT) sensor. Take readings between temperature sensor terminals #1 and #2.
Check the signal cable between climate control module terminal #B5 and engine coolant temperature (ECT) sensor terminal #2. Check for an open-circuit. Check for a short-circuit to supply voltage.
Check the ground lead between control module terminal #B6 and engine coolant temperature (ECT) sensor terminal #1. Check for an open-circuit. Check for a short-circuit to supply voltage.

Hint: An open-circuit in the ground lead may have been caused by a short-circuit to supply voltage. Always check the signal cable for this fault cause as well.

Remedy as necessary.

Other information:
- To replace the engine coolant temperature (ECT) sensor, see Engine coolant temperature (ECT) sensor (A/C) Service and Repair
- To connect the breakout box, see Connecting the breakout box, climate control module Connecting The Breakout Box
- For the resistance values, see Electrical / electronic system specifications [1][2]Specifications
- For the voltage of the signal cable, see Climate control signal specifications Signal Specification
- Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault










Continue - Verification

-------------------------------------------------

Verification

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








- Ignition off
- Reinstall the connectors, components etc.
- Start the engine
- Read off the engine coolant temperature (ECT).
The fault has been remedied if the temperature is OK.





Is the temperature reading OK?

Yes - FAULT FOUND

No - Fault-tracing information

-------------------------------------------------

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 - Exit fault-tracing

No - Attempt New Test

------------------------

Attempt New Test - Checking connectors

FAULT-TRACING FAILED - No Fault Found

-------------------------------------------------