Signal Too Low - Permanent Fault

Signal too low. Permanent fault

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

Other information
- To connect the breakout box / access the control module, see Connecting the breakout box, B5244T5, B5254T2 Connecting the Breakout Box
- To access or replace the knock sensor (KS), see Knock sensor (KS), replacing Service and Repair
- For information about signals on 5 cylinder engines, see Signal specification Signal Specification, ECM
- For information about signals on 6 cylinder engines, see Signal specification Signal Specification, ECM
- Checking wiring and terminals Checking Wiring And Terminals.














Continue - Checking the knock sensor (KS) signal

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Checking the knock sensor (KS) signal








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

Other information
- To access or replace the knock sensor (KS), see Knock sensor (KS), replacing Service and Repair
- For information about signals on 5 cylinder engines, see Signal specification Signal Specification, ECM
- For information about signals on 6 cylinder engines, see Signal specification Signal Specification, ECM.














OK - Fault Found

Not OK - Replacing the component

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Replacing the component
Replace the knock sensor (KS). See Knock sensor (KS), replacing Service and Repair.






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 - FAULT-TRACING FAILED

No - Attempt New Test

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FAULT-TRACING FAILED - FAULT-TRACING FAILED

Attempt New Test - Checking wiring and connectors

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