3.
Measure resistance between terminals 2 of the sensor harness connector and 21 of the ECM harness connector
1)
Specification : Approx. 0Ω
Ignition "OFF"
Disconnect Knock sensor and ECM connectors
Measure resistance between terminals 2 of the sensor harness connector and 21 of the ECM harness connector
Specification : Approx. 0Ω
Is resistance within the specification?
YES
▶ Go to "Signal Circuit Inspection" procedure
NO
▶ Check for an open in ground circuit. Repair as necessary and go to "Verification of Vehicle Repair" procedure
Check for short to ground in signal circuit
Measure resistance between terminal 1 of sensor harness connector and chassis ground
Specification : Infinite
Is resistance within the specification?
YES
▶ Go to next step as below
NO
▶ Check signal circuit for short to ground. Repair as necessary and go to "Verification of Vehicle Repair" procedure.
Check for short to power in signal circuit
Disconnect ECM connector
Ignition "ON" & Engine "OFF"
Measure voltage between terminals 1 of sensor harness connector and chassis ground.
Specification : Approx. 0V
Is voltage within the specification?
YES
▶ Go to next step as below
NO
▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure.
Check for open in signal harness
Ignition "OFF"
Measure resistance between terminals 1 of sensor harness connector and 22 of the ECM harness connector.
Specification : Approx. 0Ω
Is resistance within the specification?
YES
▶ Go to next step as below
NO
▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure.
Many malfunctions in the electrical system are caused by poor harness(es) and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
Has a problem been found?
YES
▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure
NO
▶ Go to next step as below
