Faulty Signal. Permanent Fault

Faulty signal. Permanent fault

Checking the signal cable








- Ignition off
- Knock sensor (KS) connector disconnected
- Ignition on.
Connect a voltmeter between knock sensor connector terminal 1 (control module side) and ground.













The voltmeter should read approximately 0 V.

OK - Checking the signal cable

Not OK - Checking the signal cable

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Checking the signal cable




- Ignition off.
Connect an ohmmeter between the knock sensor (KS) connector terminals 1 and 2 (engine control module (ECM) side).
The ohmmeter should read approximately 100 kohms.
1. 95-105 kohms
2. 0 ohms
3. Infinite resistance.









Select one of the above options to continue.

1 - Checking terminals

2 - Checking the signal cable

3 - Checking ground leads

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Checking terminals




Check the knock sensor (KS) connector for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault.
Remedy as necessary.

Were any faults found?

Yes - Verification

No - Defective knock sensor (KS)

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Checking the signal cable
Check the cable between knock sensor (KS) connector terminal 1 (control module side) and engine control module (ECM) terminal #51. Check for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault.
Remedy as necessary.













Select Continue.

Continue - Verification

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Checking ground leads
Connect an ohmmeter between knock sensor (KS) connector terminal 2 (engine control module (ECM) side) and ground. Connect an ohmmeter between knock sensor (KS) connector terminal #3 (control module side) and ground. In both cases the ohmmeter should display approximately 0 ohms.









Was a fault detected?

Yes - Checking the ground lead

No - Checking the ground lead

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Checking the ground lead
Check the cable between knock sensor (KS) connector terminal 1 (control module side) and engine control module (ECM) terminal #51. Check for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault.
Remedy as necessary.













Select Continue.

Continue - Verification

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Checking the ground lead
Check the cables between knock sensor (KS) connector terminal 2 (control module side) and engine control module (ECM) terminal #76 and between knock sensor (KS) connector terminal 3 (control module side) and engine control module (ECM) terminal #19. Check for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault.
Remedy as necessary.













Select Continue.

Continue - Verification

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Checking the signal cable
Check the cable between knock sensor (KS) connector terminal 1 (control module side) and engine control module (ECM) terminal #51. Check for a short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault.
Remedy as necessary.













Select Continue.

Continue - Verification

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Defective knock sensor (KS)
Try a new knock sensor (KS). See Replacing the knock sensor (KS) Service and Repair.

Select Continue.

Continue - Verification

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Verification








- Reconnect the connectors, reinstall components etc.
- Connect VCT 2000
- Start the engine
- Rev the engine to 4000 rpm a couple of times.
Read off diagnostic trouble codes (DTCs)





Has the status of the diagnostic trouble code (DTC) changed to intermittent?

Yes - FAULT FOUND

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 - FAULT-TRACING FAILED

No - Attempt New Test

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FAULT-TRACING FAILED - FAULT-TRACING FAILED

Attempt New Test - Checking the signal cable

No Fault Found - No Fault Found

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