Troubleshooting

98 RENR2696-01
Troubleshooting Section
•
No – The +5 V sensor diagnostic code is no longer
active when the
harness is disconnected. Either
the harness or a sensor that is attached to the
harness is causing the problem. Reconnect the
ECM engine har
ness connector. Proceed to Test
Step 4.
Test Step 4. D
isconnect The +5 V Sensors
While Active
Diagnostic Codes Are Being
Monitored.
A. Connect the electronic service tool to the
diagnostic
connector.
B. Turn the keyswitch to the ON position while the
engine is OF
F.
C. Access the active diagnostic code screen on
the electro
nic service tool. Verify that one of the
following diagnostic codes is active:
•
262-03 5 Vo
lt Sensor Supply voltage more than
normal
•
262-04 5 Vo
lt Sensor Supply voltage less than
normal
D. Disconnec
t the following sensors one at a time:
•
Engine oil pressure sensor J201/P201
•
Intake manifold pressure sensor J200/P200
E. Wait for 30
seconds after each pressure sensor
is disconnected while the electronic service tool
is being m onitored in order to verify that the
disconne
ction of a specific sensor deactivates the
+5 V diagnostic code.
Note: Whe
n the sensors are disconnected and
the keyswitch is in the ON position, open circuit
diagnostic codes will be active or logged when the
+5 V diagn
ostic codes are no longer active. This is
normal. Clear these diagnostic codes after this test
step is completed.
Expected Result:
The orig
inal +5 V diagnostic code remains active.
Results:
•
Yes – The +5 V diagnostic code is still active. The
harness is the cause of the problem. Leave the
sensors
disconnected. Proceed to Test Step 5.
•
No – The +5 V diagnostic code is not active when
a specif
ic sensor is disconnected.
Repair: Reconnect the sensor that is suspected
of causing the p
roblem. If the problem returns
after the reconnection of the sensor, disconnect
the sensor. If the problem disappears after the
disconnectio
n of the sensor, replace the sensor.
Clear all diagnostic codes. Verify that the repair
eliminates t
he problem.
STOP.