W/Harness Inspection

Terminal and Connector Inspection

1. Many malfunctions in the electrical system are caused by poor harness and terminal condition. 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
- Repair as necessary and go to "Verification of Vehicle Repair" procedure
NO
- Go to" Power Circuit Inspection" procedure.

Power Supply Circuit Inspection

1. IG "OFF" & Disconnect HO2S (B1/S1) connector.
2. IG "ON" & ENG "OFF".
3. Measure voltage between terminal 3 of HO2S (B1/S1) harness connector and chassis ground.
A. Specification : B+




4. Is the measured voltage within specification ?
YES
1) Go to "Control Circuit Inspection" procedure.
NO
1) Repair open or short to ground in HO2S (B1/S1) Heater power circuit then, go to "Verification of Vehicle Repair" procedure.

Control Circuit Inspection

1. Check short to ground in harness
(1) IG "OFF" and disconnect HO2S (B1/S1) connector.
(2) Measure resistance between terminal 4 of HO2S (B1/S1) harness connector and chassis ground.
A. Specification : Infinite Ohms Ohms




(3) Is the measured resistance within specification ?
YES
1) Go to "Check Open in harness" as follows.
NO
1) Repair short to ground in HO2S (B1/S1) heater control circuit and go to "Verification of Vehicle Repair" procedure.
2. Check open in harness
(1) IG "OFF" and disconnect HO2S (B1/S1) and PCM connector.
(2) Measure resistance between terminal 4 of HO2S (B1/S1) harness connector and terminal 70 of PCM harness connector.
A. Specification : Approx. below 1 Ohm




(3) Is the measured resistance within specification ?
YES
1) Go to "Component Inspection" procedure.
NO
1) Repair open in HO2S (B1/S1) heater control circuit and go to "Verification of Vehicle Repair" procedure.