Colt Vista FWD L4-1795cc 1.8L SOHC (1994)
Oxygen Sensor Testing
Oxygen Sensor Conditions
Oxygen Sensor Testing
O2 SENSOR TEST
1. Start and warm the engine until the coolant temperature exceeds 80°C (176°F).
2. Connect a volt meter (with at least 10 megaohm resistance) to sensor terminal A1 (do not disconnect the connector).
3. Accelerate the engine in second gear (M/T) or L range (A/T) to 3500 RPM at wide open throttle.
Voltage: Approximately 600 - 1,000 mV.
4. Faulty results in the above test may be caused by:
a. Engine mechanical problems
b. Open or shorted wiring harness
c. Fuel pressure
d. Fuel mixture
5. Perform all tests before replacing the sensor.
O2 SENSOR HEATER TEST
1. Test heater function at cold engine temperatures
2. Disconnect the O2 sensor connector.
3. Using an ohm meter, check for continuity between O2 sensor connector terminals A3 and A4.
