W/Harness Inspection

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 then go to "Verification of Vehicle Repair" procedure.
NO
1) Go to "Generator Output Voltage Inspection" procedure.

Generator Output Voltage Inspection

Charging System Check
1. Ignition "ON" & Engine "ON".
2. Maintain ENG RPM 2,500 RPM over 2 minutes.
3. Measure voltage between the battery terminal (+) and the battery terminal (-).
A. Specification : Above. 9 ± 0.5V




4. Is the measured value within specifications ?
YES
1) Go to "Power Circuit Inspection" procedure.
NO
1) Check that the tension of drive belt, ENG RPM, fuse, terminal of battery, all terminals of generator are in good condition and Check for damaged harness and poor connection between generator and battery.
If OK repair or replace generator and then go to "Verification of vehicle Repair" procedure.

Power Supply Circuit Inspection

Open or Short Check
1. Ignition "ON" & Engine "OFF".
2. Measure voltage between the battery terminal (+) and power terminal of the HECU harness connector.
A. Specification : Approx. below 0.2V




3. Is the measured value within specifications ?
YES
1) Go to "Ground Circuit Inspection" procedure.
NO
1) Check for open or blown 10A ABS fuse referring to "Circuit Diagram".
Repair open or short in power circuit between battery and HECU harness connector and then go to "Verification of vehicle Repair" procedure.

Ground Circuit inspection

Open or Short Check
1. Ignition "OFF" & Engine "OFF".
2. Disconnect HECU connector.
3. Measure resistance between ground terminal of the HECU harness connector and chassis ground.
A. Specification : Approx. below 1 Ohm




4. Is the measured value within specifications ?
YES
1) Substitute with a known-good HECU and check for proper operation.
If problem is corrected, replace HECU and then go to "Verification of Vehicle Repair" procedure.
NO
1) Repair open or short in ground circuit between HECU harness connector and chassis ground and then go to "Verification of vehicle Repair" procedure.