KENR9126 153
Troubleshooting Section
Results:
•
OK – The ECM is operating correctly. Proceed to
Test Step 9.
•
Not OK – One of the following conditions exists:
The “Voltage Below Normal” diagnostic code is
not active wh
en the harness is disconnected. The
“Voltage Above Normal” diagnostic code is not
active when the jumper wire is installed.
Repair: Perform the followin g repair:
1. Make sure th
at the latest flash file for the
application is installed in the ECM. Refer to
Troubleshooting, “Flash Programming”.
2. Contact the Technical Help Desk.
Note: This
consultation can greatly reduce the repair
time.
3. If the Tec
hnical Help Desk recommends the
use of a test ECM, install a test ECM. Refer to
Troubleshooting, “Replacing the ECM”.
4. Use the electronic service tool to recheck the
system for active diagnostic codes.
5. If the fault is resolved with the test ECM,
reconnect the suspect ECM.
6. If the fault returns with the suspect ECM,
replace the ECM.
7. Use the electronic service tool in order to clear
all logged diagnostic codes and then verify that
the re
pair eliminates the fault.
STOP.
Test Step 9. Bypass the Harness Wiring
Between the ECM and the Sensor
Connector
A. Turn the keyswitch to the OFF position.
B. Dis
connect the P2 connector and disconnect the
connector from the suspect sensor.
C. Rem
ove the sensor signal wire from the P2
connector.
D. Re
move the signal wire (terminal 3) from the
sensor connector on the engine harness.
E. Fa
bricate a jumper wire that is long enough to
reach from the ECM to the sensor connector or
use an engine sensor harness bypass with 3
t
erminals.
Note: If an engine sensor harness bypass is being
made, crimp a so
cket on one end in order to connect
to the ECM. Crimp either a pin or a socket on the
other end, as required.
F. Insert the one end of the engine sensor harness
bypass into P2 connector on the engine harness.
Insert the ot
her end of the engine sensor harness
bypass into the sensor connector of the engine
harness.
G. Reconnect the P2 connector and the sensor
connector.
H. Turn the keyswitch to the ON position.
I. Use the ele
ctronic service tool to monitor the
“Active Diagnostic Code” screen for either the
open circuit diagnostic code for the sensor or the
short circ
uit diagnostic code for the sensor.
Expected Result:
The diagnostic code disappears when the jumper or
the bypass is installed.
Results:
•
OK – Ther
e is a fault in the wiring harness.
Repair: Perform the following repair:
1. Repair the faulty harness or replace the faulty
harness.
2. Clear all diagnostic codes.
3. Use th
e electronic service tool in order to clear
all logged diagnostic codes and then verify that
the repair eliminates the fault.
STOP.
•
Not O
K – The most likely cause is an intermittent
fault.
Repa
ir: Use the electronic service tool to perform
a “Wiggle Test”. If no fault is found, restart this
procedure and carefully perform each step.
STOP.
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