3-70 FUEL SYSTEM (DFI)
Oxygen Sensor - not activated (Service Code 33, Equipped Models)
If the reading is out of the standard (with plugs: 0.8 V
or more, without plugs: 0.24 V or less), remove the ECU
and check the wiring for continuity between main harness
Special Tool - Hand Tester: 57001-1394
Disconnect the ECU and sensor connectors.
Wiring Continuity Inspection
ECU Connector [A] ←→
Oxygen Sensor Connector [B]
GY/R lead (ECU terminal 54) [C]
BR/Y lead (ECU terminal 55) [D]
If the wiring is good, replace the sensor.
If the reading is within the standard (with plugs: 0.8 V
or more, without plugs: 0.24 V or less), check the ECU
for its ground and power supply (see ECU Power Supply
If the ground and power supply are good, replace the ECU
(see ECU Removal/Installation).
Oxygen Sensor Circuit
2. Oxygen Sensor
3. Oxygen Sensor Heater Fuse 10 A
4. Ignition Switch
5. Main Fuse 30 A
7. Engine Ground