Oxygen Sensor Heater (Service Code 67) - Europe Model
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 Oxygen Sensor Removal in the Electrical
Oxygen Sensor Heater Inspection
Remove the engine sprocket cover (see Engine Sprocket
Removal in the Final Drive chapter).
Disconnect the oxygen sensor lead connector [A].
Set the hand tester [A] to the × 1 Ω range and connect it
to the terminals in the oxygen sensor lead connector [B].
Special Tool - Hand Tester: 57001-1394
Oxygen Sensor Resistance
11.7 ∼ 14.5 Ω at 20°C (68°F)
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 voltmeter [A] to the oxygen sensor con-
nector [B], using the needle adapter [C].
Special Tool - Needle Adapter Set: 57001-1457
Measure the power source voltage with the engine
stopped, and with the oxygen sensor connector joined.
Oxygen Sensor Power Source Voltage
Connections to Oxygen Sensor Connector
Tester (+) → W/Y lead [D]
Tester (−) → Battery (−) Terminal [E]
Oxygen Sensor [F]
If the reading is incorrect, check the following.
Main Fuse 30 A
Oxygen Sensor Heater Fuse 10 A
If the reading is good, the power source voltage is normal,
Inspect the Red/Black lead between the oxygen sensor
connector and the ECU for continuity, using the following
If the wiring is good, inspect the ECU for its ground, and
power supply (see ECU Power Supply Inspection). If the
ground and power supply are good, replace the ECU.
FUEL SYSTEM (DFI) 3-71