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Home >> Mitsubishi >> 1994 >> Pickup 4WD V6-2972cc 3.0L SOHC >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Oxygen Sensor >> Testing and Inspection >> Federal
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Federal





CIRCUIT DIAGRAM





INSPECTION USING SCAN TOOL











HARNESS INSPECTION PROCEDURE

COMPONENT TEST PROCEDURE
1. Disconnect the connector to the heated oxygen sensor, then use the special tool (test harness) to make connections with the connection on the heated oxygen sensor side.
2. Check if there is continuity between terminal 2 (red clip of the special tool) and terminal 4 (blue clip) of the heated oxygen sensor connector [approximately 20 Ohms at a temperature of 20°C (68°F)].
3. If there is no continuity, replace the heated oxygen sensor .
4. Warm up the engine until the coolant temperature is 80°C (176°F) or higher.
5. Using jumper wires, connect terminal 2 (red clip of the special tool) and terminal 4 (blue clip) of the heated oxygen sensor with the + terminal and - terminal on the battery, respectively.

CAUTION: When connecting the jumper wires, be careful not to connect them to the wrong terminals, since this could damage the heated oxygen sensor .

6. Connect a digital voltmeter to terminal 1 (black clip of the special tool) and terminal 3 (white clip).
7. While repeatedly racing the engine, measure the heated oxygen sensor's output voltage.

Output Voltage, Engine racing: 0.6 - 1.0Volts

NOTE: If the air-fuel ratio becomes rich while repeatedly racing the engine. the output of the heated oxygen sensor will be 0.6 - 1.0 Volts if it is normal.

8. If the measurements are not as specified, defective heated oxygen sensor is suspected.

TROUBLESHOOTING HINTS
- The exhaust gas purification performance will worsen if there is a malfunction of the heated oxygen sensor .
- If the heated oxygen sensor output voltage deviates from the standard value even though the results of the checking of the heated oxygen sensor are normal, the cause is probably a malfunction of a component related to mixture control.
[Examples]
- Malfunction of an injector.
- Air leakage into the intake manifold from a leaking gasket.
- Malfunction of the volume air flow sensor, the intake air temperature sensor, the barometric pressure sensor, or the engine coolant temperature sensor .
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