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FUEL SYSTEM (DFI) 3-101
Oxygen Sensor Heater (Service Code 67, Equipped Models)
Oxygen Sensor Heater Power Source Voltage
Inspection
NOTE
○
Be sure the battery is fully charged.
•
Turn the ignition switch off.
•
Disconnect the oxygen sensor lead connector and con-
nect the measuring adapter [A] between these connec-
tors.
Main Harness [B]
Oxygen Sensor [C]
Special Tool - Measuring Adapter: 57001-1700
•
Connect a digital meter [D] to the measuring adapter lead.
Oxygen Sensor Power Source Voltage
Connections to Adapter:
Digital Meter (+) → R (main harness BR/W) lead
Digital Meter (–) → Frame Ground Terminal
•
Measure the power source voltage with the engine
stopped and with the connector joined.
•
Turn the ignition switch on.
Power Source Voltage
Standard: Battery Voltage
•
Turn the ignition switch off.
If the reading is in specification, but the problem still ex-
ists, replace the ECU (see ECU Removal/Installation).
If the reading is out of the standard, check the following.
ECU Fuse 15 A (see Fuse Inspection in the Electrical
System chapter)
Power Source Wiring (see Oxygen Sensor Circuit)
If the fuse and wiring are good, remove the ECU and
check the wiring for continuity between main harness con-
nectors.
Disconnect the ECU and sensor connectors.
Wiring Continuity Inspection
ECU Connector [A] ←→
Oxygen Sensor Connector [B]
P/BK lead (ECU terminal 64) [C]
If the wiring is good, 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).
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