W/Harness Inspection

Power Supply Circuit Inspection

1. Ignition "OFF"
2. Disconnect CMP sensor connector
3. Ignition "ON" & Engine "OFF"
4. Measure voltage between terminal 3 of the sensor harness connector and chassis ground
A. Specification : Approx. B+




5. Is voltage within the specification ?
YES
1) Go to "Ground Circuit Inspection" procedure
NO
1) Check for a open in the power supply circuit between the main relay and the CMPS.
Especially check for open or blown 10 A sensor fuse
Repair as necessary and go to "Verification of Vehicle Repair" procedure.

Ground Circuit inspection

1. Ignition "OFF"
2. Measure resistance between terminal 1 of the sensor harness connector and chassis ground.
A. Specification : Approx. 0 ohms




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

Signal Circuit Inspection

1. Check for short to ground in signal harness
(1) Measure resistance between terminal 2 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) Repair as necessary and go to "Verification of Vehicle Repair" procedure.
2. Check for short to battery in signal harness
(1) Disconnect ECM connector
(2) Ignition "ON" & Engine "OFF"
(3) Measure voltage between terminal 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 2 of sensor harness connector and 80 of the ECM connector.
A. Specification : Approx. 0 ohms




(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 as below.