Component Tests

CIRCUIT DIAGRAM











HARNESS INSPECTION PROCEDURE

SENSOR INSPECTION

NOTE:
(1) Before checking, warm up the engine until the engine coolant temperature reaches 80 to 95°C (176 to 205°F).
(2) Use an accurate digital voltmeter.
Replace the oxygen sensor if there is a malfunction.
1. Disconnect the heated oxygen sensor connector and measure the resistance between terminal 3 and terminal 4.





Standard value

2. Replace the oxygen sensor if there is a malfunction.

Tightening torque:
Heated oxygen sensor: 50 - 60 Nm
(500 - 600 kg.cm, 37 - 44 lb.ft)

DTC P0130, P0131, P0132, P0137, P0138 - Heated Oxygen Sensor:

TROUBLESHOOTING PROCEDURES

DTC P0135, P0141 - Heated Oxygen Sensor:

DTC P0133 - Heated Oxygen Sensor:

HINT:
When the lean/rich period is above 2.6 seconds in the condition that fully warm-up engine is 2,000 - 3,000 r.p.m and engine is above middle load.

DTC P0134, P0136 - Heated Oxygen Sensor:

HINTS:
1. If the heated oxygen sensor is defective abnormally, high emissions may occur.
2. If the heated oxygen sensor check has been normal, but the sensor output voltage is out of specification, check the following items related to the air fuel ratio control system.
- Faulty injector.
- Air leaks in the intake manifold.
- Faulty mass air flow sensor, EVAP valve and engine coolant temperature sensor.
- Wiring connection problem.
3. When 02 sensor output voltage is maintained as following for above 50 sec.
- Upstream : 0.4 V - 0.6 V
- Downstream : 0.4 V - 0.5 V





USING VOLTMETER





AIR-FUEL CONTROL TROUBLESHOOTING PROCEDURE

TROUBLESHOOTING HINTS
Air/Fuel ratio stays rich or lean longer than specified period because of system malfunction.