Perkins 1106D Troubleshooting Manual page 171

KENR6201-01
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 intermittent 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, then 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 monitor the status of these tests. Refer
to Systems Operation, 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. Disconnect 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 on 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.
Results:
• OK – The harness connects the ECM to the glow
plug start aid relay and there are no shorts to other
circuits. The ECM or the glow plug start aid relay is
suspect. Proceed to Test Step 4.
•
Not OK – The harness is faulty.
Repair: If the resistance between P1:57 and
each of the other pins on the J1 connector is less
than 10,000 Ohms then there is a short circuit or
high resistance in the connection to another wire.
Locate the short circuit in the harness. Repair
the connectors or the harness and/or replace the
connectors or the harness. Ensure that all of the
seals are correctly in place and ensure that the
connectors are correctly coupled. Replace any
fuses that may be open circuit.
This document is printed from SPI². Not for RESALE
Verify that the repair has eliminated the fault.
If the fault still exists, proceed to Test Step 4.
Test Step 4. Bypass the ECM In Order to
Check the Operation of the Glow Plug
Start Aid Relay
A. Turn the keyswitch to the OFF position.
B. Disconnect the connection from test point "D" on
the glow plug start aid relay.
C. Connect a jumper wire between the battery ground
and terminal "D" on the glow plug start aid relay.
D. Measure the voltage from the battery ground and
terminal "B" on the glow plug start aid relay.
E. Turn the keyswitch to the ON position.
Note: The engine has not been started at this Test
Step.
F. Measure the voltage from the battery ground and
terminal "B" on the glow plug start aid relay.
Expected Result:
The keyswitch is in the OFF position. The voltage
should be 0 Volts DC.
The keyswitch is in the ON position. The measured
voltage for the 12 Volt systems is a constant 10.5 to
13.5 Volts DC. The measured voltage for the 24 Volt
systems is a constant 21.0 to 27.0 Volts DC.
Results:
• OK – The glow plug start aid relay is operating
correctly. Reconnect the connection to test point
"D" on the glow plug start aid relay. Proceed to
Test Step 5.
•
Not OK – The glow plug start aid relay is faulty.
Repair: Replace the glow plug start aid relay.
Verify that the repair eliminates the fault.
If the fault still exists, proceed to Test step 5.
Test Step 5. Check the ECM
A. Make sure that the latest flash file for the
application is installed in the ECM. Refer to
Troubleshooting, "Flash Programming".
B. Contact Perkins Global Technical Support.
Note: This consultation can greatly reduce the repair
time.
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Troubleshooting Section