W/Harness Inspection

Ground Circuit inspection

1. Ignition "OFF"
2. Disconnect Knock sensor and ECM connectors
3. Measure resistance between terminals 2 of the sensor harness connector and 21 of the ECM harness connector
A. Specification : Approx. 0 Ohm




4. Is resistance within the specification?
YES
1) Go to "Signal Circuit Inspection" procedure
NO
1) Check for an open in ground circuit. Repair as necessary and go to "Verification of Vehicle Repair" procedure

Signal Circuit Inspection

1. Check for short to ground in signal circuit
(1) Measure resistance between terminal 1 of sensor harness connector and chassis ground
A. Specification : Infinite




(2) Is resistance within the specification?
YES
1) Go to next step as below
NO
1) Check signal circuit for short to ground. Repair as necessary and go to "Verification of Vehicle Repair" procedure.
2. Check for short to power in signal circuit
(1) Disconnect ECM connector
(2) Ignition "ON" & Engine "OFF"
(3) Measure voltage between terminals 2 of sensor harness connector and chassis ground.
A. Specification : Approx. 0V




(4) Is voltage within the specification?
YES
1) Go to next step as below
NO
1) Repair as necessary and go to "Verification of Vehicle Repair" procedure.
3. Check for open in signal harness
(1) Ignition "OFF"
(2) Measure resistance between terminals 1 of sensor harness connector and 22 of the ECM harness connector.
A. Specification : Approx. 0 Ohm




(3) Is resistance within the specification?
YES
1) Go to next step as below
NO
1) Repair as necessary and go to "Verification of Vehicle Repair" procedure.

Terminal and Connector Inspection

1. 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.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration or damage.
3. Has a problem been found?
YES
1) Repair as necessary and go to "Verification of Vehicle Repair" procedure
NO
1) Go to next step "Component Inspection" procedure.