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3-78 FUEL SYSTEM (DFI)
Oxygen Sensor - not activated (Service Code 33, Equipped Models)
If the reading is out of the standard (with plugs: DC 0.7
V or more, without plugs: DC 0.2 V or less), remove the
ECU and check the wiring for continuity between main
harness connectors.
○
Disconnect the ECU and sensor connectors.
Wiring Inspection
ECU Connectors [A]
Oxygen Sensor Connector [B]
W/BL lead (ECU terminal 32) [C]
BR/BK lead (ECU terminal 33) [D]
If the wiring is good, replace the sensor.
If the reading is within the standard (with plugs: DC 0.7 V
or more, without plugs: DC 0.2 V or less), check the ECU
for its ground and power supply (see ECU Power Supply
Inspection).
If the ground and power supply are good, replace the ECU
(see ECU Removal/Installation).
Oxygen Sensor Circuit
1. ECU
2. Frame Ground
3. Meter Ground
4. Oxygen Sensor
5. Ignition Switch
6. Relay Box
7. ECU Main Relay
8. Starter Relay
9. FI Fuse 15 A
10. Main Fuse 30 A
11. Battery 12 V 8 Ah
12. Water-proof Joint C
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