KENR9126 183
Troubleshooting Section
Note: This bypass directly connects the circuit for the
keyswitch to th
e ECM. The ECM will remain powered
until the connection to the unswitched battery+ line
is disconnected. Remove the fuses from the in-line
fuse holder to
power down the ECM. Do not connect
the bypass to the battery terminals or do not remove
the bypass from the battery terminals without first
removing the
in-line fuses.
E. Connect the electronic service tool to the
diagnostic
connector of the bypass harness and
verify that communication can be established.
Note: Remov
e the bypass harness and restore all
wiring to the original condition after testing.
Expected R
esult:
Installing the bypass eliminates the fault.
Note: The status of the “Ignition Keyswitch” will
always indicate ON while the bypass harness is
installe
d.
Results:
•
OK – The symptom disappears when the bypass
harness is installed. The symptom returns when
the bypa
ss harness is removed. The fault is in the
wiring for the application that supplies power to
the ECM. Check for aftermarket engine protection
switche
s that interrupt power. Send the application
to the OEM dealer to repair. STOP.
•
Not OK –
The symptom is still present when the
bypass harness is installed.
Repai
r: Connect the bypass to another battery and
verify if the fault is resolved. If the fault is resolved,
the fault is with the batteries on the application.
If the fault still exists, perform the following
procedure:
1. Make sure that the latest flash file for the
application is installed in the ECM. Refer to
Trou
bleshooting, “Flash Programming”.
2. Contact the Technical Help Desk.
Note: This consultation can greatly reduce the repair
time.
3. If the Technical Help Desk recommends the
use of a test ECM, install a test ECM. Refer to
Tr
oubleshooting, “Replacing the ECM”.
4. Use the electronic service tool to recheck the
sy
stem for active diagnostic codes.
5. If the fault is resolved with the test ECM,
r
econnect 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 dia
gnostic codes and then verify that
the repair eliminates the fault.
STOP.
i04011070
Indicator L
amp Circuit - Test
System Operation Description:
Use this pr
ocedure under the following circumstances:
•
The lamps are not receiving battery voltage.
•
The lamps are not operating correctly.
Also, use
this procedure if another procedure has
directed you here.
The foll
owing diagnostic lamps are available:
•
Warning lamp
•
Diagnostic lamp
•
High co
olant temperature lamp
•
Low coolant level lamp
•
Low oil pressure lamp
•
Maint
enance lamp
•
Water in fuel lamp
The electronic service tool can be used as a
diagnostic aid in order to switch the individual lamps
ON an
dOFF.
Note: The diagnostic function that switches the
lamp
s is contained in the “Override” section in the
“Diagnostics” menu of the electronic service tool.
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