Expo LRV AWD L4-2350cc 2.4L SOHC 16 Valve (1993)
Oxygen Sensor: Testing and Inspection
California
Heated Oxygen Sensor Circuit
To test the Oxygen Sensor, located in the rear exhaust manifold after the turbo charger, proceed as follows.
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
