KENR9126 203
Troubleshooting Section
Test Step 1. Inspect 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,
“Electrica
l Connectors - Inspect” for details.
C. Perform a 45 N (10 lb) pull test on each of the
wires in the
ECM connector that are associated
with the glow plug starting aid.
D. Check the s
crew for the ECM connector for the
correcttorqueof5.0N·m(44lbin).
E. Check the h
arness for abrasion and pinch points
from the glow plugs back to the ECM.
F. Check tha
t the fuses are not blown.
Expected Result:
All connectors, pins, and sockets are correctly
coupled and/or inserted. The harness is free of
corrosi
on, abrasion, and pinch points. The fuses are
not blown.
Result
s:
•
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
conne
ctors.
Repair: Repair the connectors or the harness or
repl
ace the connectors or the harness. Ensure
that all of the seals are correctly installed and
ensure that the connectors are completely coupled.
Repl
ace blown fuses.
Use the electronic service tool in order to clear all
logg
ed diagnostic codes and then verify that the
repair has eliminated the fault.
STO
P.
Test Step 2. Check for Active Diagnostic
Codes
A. Connect the electronic service tool to the
diagnostic connector.
B. Turn the keyswitch 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 Res
ult:
The following diagnostic code is active or recently
logged:
•
2246-05 Glow Plug Start Aid Relay Current below
normal
•
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 int
ermittent 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
displa
yed, 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 n
ot monitor 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. Rem
ove the P1 connector from the ECM.
C. Check the connector, pins, and the sockets for
cor
rosion or damage.
D. Check the resistance between P1:29 or P1:32 and
ea
ch of the pins on the P1 connector.
Expected Result:
The resistance between P1:29 or P1:32 and each of
the pins on the P1 connector is more than 10,000
O
hms.
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