KENR6933 155
Troubleshooting Section
D. Remove the fuses from the Battery+ wire of the
bypass harness
and co nnect the Battery+ and the
Battery- w ires directly to the battery term inals.
Note: This byp
ass directly connects the circuit for the
keyswitch to the ECM. The ECM will remain powered
until the connection to the unswitched battery+ line
is disconnec
ted. 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 fr
om the battery terminals without first
removing the in-line fuses.
E. Connect the e
lectronic service tool to the
diagnostic connector of the bypass harness and
verify that communication can be established.
Note: Remove the bypass harness and restore all
wiring to the original condition after testing.
Expected Result:
Installing
the bypass eliminates the fault.
Note: The status of the “Ignition Keyswitch” will
always indi
cate ON while the bypass harness is
installed.
Results:
•
OK – The symptom disappears when the bypass
harness is
installed. The symptom returns when
the bypass harness is removed. The fault is in the
wiring for the application that supplies power to
the ECM. Ch
eck for aftermarket engine protection
switches 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.
Repair: 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, temporarily connect a
test ECM.
Remove all jumpers and replace
all connectors. Recheck the system for active
diagnostic codes and repeat the Test Step. If the
fault is
resolved with the test ECM, reconnect the
suspect ECM. If the fault returns with the suspect
ECM, replace the ECM.
Use the electronic service tool in order to clear all
logged diagnostic codes and then verify that the
repair
eliminates the fault.
STOP.
i02660145
Indicator Lamp Circu it - Test
System Operation Description:
Use this procedure under the following circumstances:
•
The lamps are n
ot receiving battery voltage.
•
The lamps are not operating correctly.
Also, use this procedure if another procedure has
directed you here.
The following diagnostic lamps are available:
•
Power Take Off
(PTO) lamp
•
Stop lamp
•
Warning lamp
•
Cold start (wa
it to start lamp)
•
Low oil pressure lamp
The electronic service tool can be used a s a
diagnostic aid in order to switch the individual lamps
ON and OFF.
Note: The diagnostic function that switches the
lampsisconta
ined in the “Override” section in the
“Diagnostics” menu of the electronic service tool.
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