Permanent Fault, Faulty Signal

Permanent fault, faulty signal

Checking signal cable








- Ignition off.
- Engine coolant temperature (ECT) sensor connector disconnected.
- Ignition on.
Connect an ohmmeter between knock sensor (KS) connector terminal 1 (engine control module (ECM) side) and ground.













The voltmeter should read approximately 0 V.

OK - Checking signal cable

Not OK - Checking signal cable

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Checking signal cable




- Ignition off.
Connect an ohmmeter between knock sensor (KS) connector terminal 1 and 2 (control module 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 signal cable

3 - Checking ground leads

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Checking terminals




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













Continue - Verification

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









Was a fault detected?

Yes - Checking ground lead

No - Checking ground lead

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













Continue - Verification

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Checking ground lead
Check cable 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 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault.
Remedy as necessary.













Continue - Verification

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













Continue - Verification

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Defective knock sensor (KS)
Try a new knock sensor (KS) according to Replacing the knock sensor (KS) .

Continue - Verification

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Verification




- Reconnect connectors, reinstall components.
- Connect the VCT 2000.
Read off diagnostic trouble codes (DTCs).





Has diagnostic trouble code (DTC) EFI-143 changed status 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 - Exit fault-tracing

No - Attempt New Test

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Attempt New Test - Checking signal cable

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