W/Harness Inspection

Control Circuit or Short Circuit in ETC Motor Harness

Check for Open or Short Circuit in ETC Motor Harness
1. Reconnect the ETC motor connector.
2. Disconnect ECM connector
3. Measure resistance between terminals 71 and 72 of the ECM harness connector
A. Specification: 1.2 - 1.8 Ohms at 20 °C (68 °F)




4. Is resistance within the specification ?
YES
1) Go to "Terminal and Connector Inspection" procedure
NO
1) Possibility of open or short circuit in control harness. Go to next step to check the wiring harness
Control Circuit Inspection (ETC output1)
1. Check for short to ground in control circuit
(1) Ignition "OFF"
(2) Disconnect ETC assembly connector
(3) Measure resistance between terminal 3 of the ETC motor harness connector and chassis ground
A. Specification: Infinite




(4) 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 control circuit
(1) Disconnect ECM harness connector
(2) Ignition "ON" & Engine "OFF"
(3) Measure voltage between terminal 3 of the ETC motor 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 control circuit
(1) Ignition "OFF"
(2) Measure resistance between terminals 3 of the ETC motor harness connector and 71 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
Control Circuit Inspection (ETC Output2)
1. Check for short to ground in control circuit
(1) Measure resistance between terminal 6 of the ETC motor 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 control circuit
(1) Ignition "ON" & Engine "OFF"
(2) Measure voltage between terminal 6 of the ETC motor harness connector and chassis ground
A. Specification: Approx. 0V




(3) 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 control circuit
(1) Ignition "OFF"
(2) Measure resistance between terminals 6 of the ETC motor harness connector and 72 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) Check for poor connection between ECM and component: backed out terminal, improper mating, broken locks or poor terminal to wire connection. Repair as necessary and go to "Verification of Vehicle Repair" procedure