3-84 FUEL SYSTEM (DFI)
Oxygen Sensor Heaters (#1, #2: Service Code 67)-Europe Models
Oxygen Sensor Heater Removal/Installation
The oxygen sensor heater is bult in the oxygen sensor.
So, the heater itself can not be removed. Remove the oxy-
gen sensor (see Switch and Sensors section in the Electri-
cal System chapter).
Oxygen Sensor Heater Inspection
Right Side Cover (see Right Side Cover Removal in the
Disconnect the each oxygen sensor lead connectors [A].
Set the hand tester [A] to the × 1 Ω range and connect it
to the terminals in the oxygen sensor lead connector [B].
White Lead Terminal [C]
White Lead Terminal [D]
Special Tool - Hand Tester: 57001-1394
Oxygen Sensor Resistance
If the tester reading is not as specified, replace the oxygen
sensor with a new one.
If he tester reading is specified, check the power source
Be sure the battery is fully charged.
Connect a digital meter [A] to each oxygen sensor con-
nector [B], using the needle adapter [C].
Special Tool - Needle Adapter Set: 57001-1457
Oxygen Sensor Heaters Power Source Voltage
Connections to Oxygen Sensor Connector
Tester (+) → W (main harness side P/BK) lead [D]
Tester (−) → Battery (−) Terminal [E]
Oxygen Sensor #1 [F]
Oxygen Sensor #2 [G]
Measure the power source voltage with the engine
stopped, and with the oxygen sensor connector joined.
Turn the ignition switch ON.
Power Source Voltage at Sensor Connector
about 8 Ω at 20°C (68°F)
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