(Table 184, contd)
Troubleshooting Test Steps
Values Results
6. Check the Wiring Between the Relay and the ECM for a
Short Circuit
A. Disconnect the P1 connector.
B. Inspect the P1 connector. Refer to Troubleshooting, “Elec-
trical Connectors - Inspect” for details.
C. Use a suitable multimeter to measure the resistance be-
tween P1:49 and all other terminals on the P1 connector.
Greater than 1 k
Ohm
Result: At least one of the resistance measurements is less
than 1 k Ohm. There is a short in the wiring between the re-
lay and the ECM.
Repair: Repair the faulty wiring or replace the faulty wiring.
Use the electronic service tool to clear all logged diagnostic
codes and verify that the repair eliminates the fault.
Result: All resistance measurements are greater than 1 k
Ohm.
Contact the Dealer Solutions Network (DSN).
7. Check the Operation of the Glow Plugs
A. Place a suitable clamp-on ammeter on the power supply
wire.
B. Use the electronic service tool to select the “Glow Plug
Start Aid Override Test” to turn on the power for the glow
plugs.
C. Wait for 20 seconds and then note the reading on the
clamp-on ammeter.
Approximately
28.0 Amps for a
12 VDC system.
Approximately
10.0 Amps for a
24 VDC system.
Result: The reading on the clamp on ammeter near the ex-
pected reading.
The glow plugs are operating correctly.
Return the engine to service.
Result: The reading on the clamp on ammeter is between
zero and the expected reading.
Proceed to Test Step 8.
Result: The reading on the clamp on ammeter is zero.
Proceed to Test Step 9.
8. Test the Continuity of the Glow Plugs
A. Disconnect the power supply and remove the bus bar from
the glow plugs.
B. Use a suitable digital multimeter to check continuity (resist-
ance). Turn the audible signal on the digital multimeter ON.
C. Place one probe on the connection for one of the glow
plugs and the other probe to a suitable ground. The digital
multimeter should make an audible sound.
D. Repeat the continuity check on the remaining glow plugs.
One or more glow
plugs do not have
continuity.
Result: One or more of the glow plugs do not display
continuity.
Repair: Replace any glow plugs that do not show
continuity.
Use the electronic service tool to clear all logged diagnostic
codes and verify that the repair eliminates the fault.
Result: All glow plugs display continuity.
Repeat this procedure from Test Step 1.
9. Check the Fuse
A. Turn the battery disconnect switch to the OFF position.
B. Check the fuse for the glow plug start aid relay. Refer to the
appropriate Electrical Schematic.
Blown fuse Result: The fuse is blown - there is a short in the power cir-
cuit for the glow plugs.
Check the wiring between the batteries and the glow plug
relay for a short circuit. Refer to the appropriate Electrical
Schematic. Make any necessary repairs.
Replace the blown fuse.
Result: The fuse is not blown.
Proceed to Test Step 10.
(continued)
UENR4469-36 333
Circuit Tests
Copyright of Perkins Engine Company Limited. NOT FOR REPRINTING OR RESALE
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