Signal Too Low. Permanent Fault

Signal too low. Permanent fault

Checking wiring and components
Check knock sensor (KS) connector for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check the signal cable between knock sensor (KS) #3 and control module #A45 (#A45) and the ground lead between knock sensor (KS) #4 and control module #A67 (#B7) for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault and for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check that the knock sensor (KS) is tightened to the correct torque.
Remedy as necessary.

Other information
- Connecting the breakout box/accessing the control module, see Connecting the breakout box, B5234T9, B5244T7 Connecting The Breakout Box.
- To access/replace the knock sensor (KS), see Knock sensor (KS), replacing, B5234T9, B5244T7 Removal and Replacement.
- For information about signals, see Signal specification Signal Specifications.














Continue - Checking knock sensor (KS) signal

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Checking knock sensor (KS) signal








- Ignition off
- Reinstall components, reconnect connectors etc.
- Start engine and run to normal operating temperature.
- Rev the engine to 3500 rpm and read off the value of the knock sensor (KS) signal.
The value should be between 2 and 6.
If the value is now OK it means that the cause of the fault has been loose connections in connector.

Other information
- To access/replace the knock sensor (KS), see Knock sensor (KS), replacing, B5234T9, B5244T7 Removal and Replacement.
- For information about signals, see Signal specification Signal Specifications.













Is the value between 2 and 6?

OK - FAULT FOUND

Not OK - Replacing component

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Replacing component
Replace knock sensor (KS) according to Knock sensor (KS), replacing, B5234T9, B5244T7 Removal and Replacement.






Continue - Verification

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Verification




Verification

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








- Ignition off.
- Reconnect the connectors, reinstall components etc.
- Start engine and run to normal operating temperature.
- Rev the engine to 3500 rpm and read off the value of the knock sensor (KS) signal.









Is the value between 2-6?

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 - Exit fault-tracing

No - Attempt New Test

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Attempt New Test - Checking wiring and components

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