3.
Has a problem been found?
 | ▶ Repair as necessary and then go to "Verification of Vehicle Repair" procedure. |
 | ▶ Go to "Power Circuit Inspection" procedure. |
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.
Thoroughly check all connectors (and connections) for looseness, bending, corrosion, contamination, deterioration, and/or damage.
Has a problem been found?
| ▶ Repair as necessary and then go to "Verification of Vehicle Repair" procedure. |
| ▶ Go to "Power Circuit Inspection" procedure. |
Ignition "OFF".
Refer to "Shop Manual" and disconnect Downstream O2 Sensor connector.
Ignition "ON".
Measure voltage between Pin No. 3 (Power) terminal of Downstream O2 Sensor harness connector and chassis ground.
Specification : B+
Is measured value within specification?
| ▶ Go to "Control Circuit Inpsection" procedure. |
| ▶ Repair open or short in power circuit between Downstream O2 Sensor and Battery and then go to "Verification of vehicle Repair" procedure. |
Ignition "OFF".
Refer to "Shop Manual" and disconnect Downstream O2 Sensor connector.
Ignition "ON".
Measure voltage between Pin No. 4 (Control) terminal of Downstream O2 Sensor harness connector and chassis ground.
Specification : Approx. 2.5V
Ignition "OFF".
Disconnect Battery (-) terminal.
Refer to "Shop Manual" and disconnect Downstream O2 Sensor and PCM connector.
Measure resistance between Pin No. 4 (Control) terminla of Downstream O2 sensor harness connector and chassis ground.
Specification : Infinite (∞) Ω
Is measured value within specification?
| ▶ Go to "Component Inpsection" procedure. |
| ▶ Repair open or short in control circuit between Downstream O2 Sensor and chassis ground and then go to "Verification of vehicle Repair" procedure. |
