Signal Too Low

Signal too low

Checking the components and wiring
- Check 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) #A7 (#A7) and knock sensor #1.
- The engine control module (ECM) #A55 (#A55) and the knock sensor #2.
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

-------------------------------------------------

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

-------------------------------------------------

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

------------------------

Attempt New Test - Checking the components and wiring

-------------------------------------------------