Signal Missing. Permanent Fault

Signal missing. Permanent fault

Checking component and wiring
Check if there is any refrigerant in the air conditioning (A/C).

Hint: If there is refrigerant in the A/C system there is probably a fault in the A/C pressure sensor.

Check air conditioning (A/C) system for damage and leakage.
Remedy as necessary.

Other information:
- Connecting the breakout box/accessing the control module, see Connecting the breakout box, B5234T9, B5244T7 Connecting The Breakout Box.
- Air conditioning (A/C) pressure sensor #2 is the signal cable, #3 is the power supply (5 V) and #1 is the signal ground.
- For resistance values, see Component specifications [1][2]Engine Control Module.
- For information about signals, see Signal specification Signal Specifications.














Continue - Verification

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Verification




Verification

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








- Ignition off.
- Reinstall connectors, components etc.
- Start the engine.
- Air conditioning (A/C) switch on
- Start the blower fan
Check that the pressure increases in the air conditioning (A/C) system when the air conditioning (A/C) compressor engages.
Also check if cold air blows into the passenger compartment when at the coolest setting.

Note! The air conditioning (A/C) pressure is given in volts for values see Component specifications Specifications.









Does the pressure in air conditioning (A/C) system change?

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 - Exit fault-tracing

No - Attempt New Test

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Attempt New Test - Checking component and wiring

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