Signal Too High

Signal too high

Checking the function




- Ignition on
- Check that the value from the air quality sensor is within the permitted range.

Note! The blower fan must be running.

Expose the fresh air intake to windshield washer fluid, gasoline vapor or similar.
The value should be between 4% and 96%.









Is this value within its permitted range?

Yes - Checking the connectors and cables

No - Checking components and wiring

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Checking the connectors and cables
Check the climate control module (CCM) and air quality sensor connectors. Check for contact resistance and oxidation. Check for loose connections.
Check the cable between control module terminal #B3 (#3) and air quality sensor terminal #3. Check for an intermittent open-circuit. Check for an intermittent short-circuit to supply voltage.
Check the cable between control module terminal #B5 (#5) and air quality sensor terminal #5. Check for an intermittent open-circuit. Check for an intermittent short-circuit to supply voltage.
Check the cable between control module terminal #B16 and air quality sensor terminal #1. Check for an intermittent open-circuit. Check for an intermittent short-circuit to ground.

Other information:
- To access and replace the control module see Climate control module (CCM), replacing Service and Repair
- To access or replace the air quality sensor, see Air quality sensor, replacing Service and Repair
- For other values, see Signal description, climate control module (CCM), Connector B Signal Description, Climate Control Module (CCM), Connector B
- Checking wiring and terminals Checking Wiring And Terminals.










Continue - Fault-tracing information

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Checking components and wiring
Check the cable between control module terminal #B3 (#3) and air quality sensor terminal #3. Check for an open-circuit. Check for a short-circuit to supply voltage.
Check the cable between control module terminal #B5 (#5) and air quality sensor terminal #5. Check for an open-circuit. Check for a short-circuit to supply voltage.
Check the cable between control module terminal #B16 (#16) and air quality sensor terminal #1. Check for an open-circuit. Check for a short-circuit to supply voltage.
Remedy as necessary.

Other information:
- To access and replace the control module see Climate control module (CCM), replacing Service and Repair
- To access or replace the air quality sensor, see Air quality sensor, replacing Service and Repair
- For other values, see Signal description, climate control module (CCM), Connector B Signal Description, Climate Control Module (CCM), Connector B
- Checking wiring and terminals Checking Wiring And Terminals.





Was a fault detected?

Yes - Verification

No - Fault-tracing information

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Verification




Verification

Verification

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








- Ignition off
- Reconnect the connectors, reinstall components etc.
- Ignition on
- Check that the value from the air quality sensor is within the permitted range.
The value should be between 4% and 96%.









Are the values correct?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFICATION FAILED - Fault-tracing information

VERIFIED - Fault Found

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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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Attempt New Test - Checking the function

FAULT-TRACING FAILED - No Fault Found

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Fault-tracing information




Information

Fault-tracing information
If the fault is intermittent, do not verify fault-tracing if the fault does not recur.
It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).

Do you want to view the information again?

Yes - Attempt New Test

No - Fault Found

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FAULT FOUND - Fault Found

Attempt New Test - Checking the function

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