PGM-FI Control System — Troubleshooting Flowchart — Oxygen Sensor [With CATA] (cont'd)
6-25flowchartOxygen sensor troubleshooting flowchart for vehicles With CATA (catalytic converter).
1
(From page 6-24)
2
Disconnect engine wire harness from O2 sensor.
3
Warm up engine to normal operating temperature again, then open the throttle wide open then close it.
4
Measure voltage between the connector terminal and body ground.
5
Is voltage above 0.6V during wide open acceleration? Is voltage below 0.4V during closed throttle deceleration from 5,000 min-1 (rpm)?
NO
Replace O2 sensor.
YES
6
Stop engine.
7
Connect the PGM-FI test harness between the ECU and connector (page 6-19).
8
Restart and warm up engine to normal operating temperature, then open the throttle wide open then close it.
9
Measure voltage between C16 (+) and A18 (-) terminals.
10
Is voltage above 0.6V during wide open acceleration? Is voltage below 0.4V during closed throttle deceleration from 5,000 min-1 (rpm)?
NO
Repair short or open in WHT wire between ECU (C16) and O2 sensor.
YES
Substitute a known-good ECU and recheck. If symptom/indication goes away, replace the original ECU.
| Specification | Value |
|---|---|
| O2 SENSOR | 45N·m |
O2 SENSOR
45N·m