Signal Too Low

Signal too low

Checking the components and wiring
Check the knock sensor (KS) connector. Check for contact resistance and oxidation.
Check the signal cable. Check for an open-circuit. Check for a short-circuit to ground.
Take readings between:
- Engine Control Module (ECM) #A79 (#B19) and knock sensor #3.
Check the ground cable for breakage and short-circuiting to ground.
Take readings between:
- Engine control module (ECM) #A31 (#A31) and the knock sensor #4.
Check that the knock sensor (KS) is tightened to the correct torque.
Remedy as necessary.

Other information
- Connecting the breakout box, B5254T7 Connecting The Breakout Box, Engine Control Module (ECM)
- Signal specification, B5254T7 Signal Specification, Engine Control Module (ECM)
- Knock sensor (KS), B5254T7 Service and Repair
- Checking wiring and terminals Checking Wiring and Terminals









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 the engine and run it to normal operating temperature
- Run the engine to 3500 rpm. Read off the value of the knock sensor (KS) signal. The value must be between 2-6.





Is the function OK?

Yes - Troubleshooting procedure complete

No - 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 the components and wiring

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