W/Harness Inspection

Terminal and Connector Inspection

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

Power Supply Circuit Inspection

Check voltage
1. IG "OFF" & Disconnect HO2S (B2/S2) connector.
2. IG "ON" & ENG "OFF".
3. Measure voltage between power terminal of HO2S (B2/S2) heater harness connector and chassis ground.
A. Specification : B+




4. Is the measured voltage within specification ?
YES
> Go to "Control Circuit Inspection" procedure.
NO
> Repair open or short to ground in HO2S (B2/S2) Heater power circuit then, go to "Verification of Vehicle Repair" procedure.

Control Circuit Inspection

Check short to ground in harness
1. IG "OFF" and disconnect HO2S (B2/S2) connector.
2. Measure resistance between control terminal of HO2S (B2/S2) heater harness connector and chassis ground.
A. Specification : Infinite




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 (B2/S2) heater control circuit and go to "Verification of Vehicle Repair" procedure.
Check open in harness
1. IG "OFF" and disconnect HO2S (B2/S2) and PCM connector.
2. Measure resistance between control terminal of HO2S (B2/S2) heater harness connector and heater control terminal 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 (B2/S2) heater control circuit and go to "Verification of Vehicle Repair" procedure.