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FUEL SYSTEM (Programmed Fuel Injection)
MIL 21 BLINKS
( 0 2
SENSOR)
NOTE:
Before starting the troubleshooting, check the
0 2
sensor 4P connector for loose contacts or cor-
roded terminals, and recheck the
MIL.
1.
0 2
Sensor Output Voltage Inspection
Connect the test harness between the ECM con-
nectors (page 5-9).
Start the engine and warm it u p until the cooling
fan comes on.
Check the voltage between the test harness ter-
minals.
Connection: #29 (+)
-
#31
(4
Standard: 0.1
-
0.3 V
I s
the voltage within the standard value?
YES
-
Check the fuel supply system (page
5-33).
If the system is normal, GO TO STEP
4.
NO
-
GO TO STEP 2.
2.
0 2
Sensor Open Circuit Inspection
Turn the ignition switch t o OFF.
Disconnect the
0 2
sensor
4P
(black) connector
(page 5-47).
Check for continuity between each test harness
terminal and wire harness side 4P connector ter-
minal.
Connection: #29
-
Black/orange
#31- Greedorange
Is there continuity?
NO
-
Open circuit
in
the BlacWorange or
Greedorange wire.
YES
-
GO TO STEP
3.
3.
0 2
Sensor Short Circuit Inspection
Disconnect the test harness.
Check for continuity between the wire harness
side 4P connector terminal and ground.
Connection: Black/orange
-
Ground
Is there continuity?
YES
-
Short circuit in the BlacWorange wire.
NO
-
GO TO STEP 4.
orange
Black/
orange
OR
4P
CONNECTOR
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