176 KENR6933
Troubleshooting Section
Test Step 1. Insp ect Electrical Connectors
and Wiring
A. Inspect the following connectors:
•
P1 connector
•
P2 connector
B. Inspect the terminal connections on the glow
plug start aid relay. Refer to Troubleshooting,
“Electrical C
onnectors - Inspect” for details.
C. Perform a 45 N (10 lb) pull test on each of the
wires in the E
CM connector that are associated
with the glow plug starting aid.
D. Check the scr
ew for the ECM connector for the
correcttorqueof5.0N·m(44lbin).
E. Check the har
ness for abrasion and pinch points
from the glow plugs back to the ECM.
F. Check that th
e fuses are not blown.
Expected Result:
All connectors, pins and sockets are correctly coupled
and/or inserted. The harness is free of corrosion,
abrasion an
d pinch points. The fuses are not blown.
Results:
•
OK – The harness and the connectors appear to
be OK. Proceed to Test Step 2.
•
Not OK – There is a fault with the harness and
connectors.
Repair: Repair the connectors or the harness or
replace the connectors or the harness. Ensure
that all of
the seals are correctly installed and
ensure that the connectors are completely coupled.
Replace blown fuses.
Use the electronic service tool in order to clear all
logged diagnostic codes and then verify that the
repair has
eliminated the fault.
STOP.
Test Step 2. Check for Active Diagnostic
Codes
A. Connect t
he electronic service tool to the
diagnostic connector.
B. Turn the k
eyswitch to the ON position. Do not start
the engine.
C. Use the electronic service tool to select the “Glow
Plug Override T
est” in order to turn on the power
for the glow plugs.
D. Check for acti
ve diagnostic codes or recently
logged diagnostic codes.
Expected Resu
lt:
The following diagnostic code is active or recently
logged:
•
2246-06 Glow Plug Start Aid Relay Current above
normal
Results:
•
OK – The expected diagnostic code is active or
recently logged. Proceed to Test step 3.
•
Not OK – An active diagnostic code or a recently
logged diagnostic code was not displayed.
Repair: Perform one of the following procedures:
•
If an intermi
ttent fault is suspected, use the
electronic service tool to perform a “Wiggle Test”
in order to locate intermittent connections.
•
If there is a fault on the glow plug or a fault on
the starting aid and a diagnostic code is not
displayed,
there may be a fault with the glow
plug switched power circuit or there may be an
open circuit in the relay coil circuit. The ECM
does not mon
itor the status of these items. Refer
to Testing and Adjusting, “Glow Plugs - Test”.
STOP.
Test Step 3. Check the Wiring for a Short
Circuit
A. Turn the keyswitch to the OFF position.
B. Remove the
P1 connector from the ECM.
C. Check the connector, pins and the sockets for
corrosion
or damage.
D. Check the resistance between P1:57 and each of
the pins o
n the P1 connector.
Expected Result:
The resistance between P1:57 and each of the pins
on the P1 connector is more than 10,000 Ohms.
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