Table 223
Troubleshooting Test Steps
Values Results
1. Inspect Electrical Connectors and Wiring
A. Turn the keyswitch to the OFF position.
B. Inspect the connectors for the speed/timing sensors. Refer
to Troubleshooting, “Electrical Connectors - Inspect”.
C. Perform a 45 N (10 lb) pull test on each of the wires in the
suspect sensor connector and the sensor connections at the
ECM.
D. Check the screw for the ECM connector for the correct tor-
que of 6 N·m (53 lb in).
E. Check the ground connection on the ECM for abrasions
and pinch points.
F. Check the harness for abrasion and pinch points from the
suspect sensor to the ECM.
G. Check that the suspect sensor is installed correctly. Check
that the suspect sensor is fully seated into the engine.
Loose connection or
damaged wire
Result: There is a fault in a connector or the wiring.
Repair: Repair any faulty connectors or replace the wir-
ing harness. Ensure that all the seals are properly in
place and ensure that the connectors are correctly
coupled.
Use the electronic service tool to clear all logged diag-
nostic codes and verify that the repair eliminates the
fault.
Result: All connectors, pins, and sockets are correctly
coupled and/or inserted. The harness is free of corrosion,
abrasion, and pinch points.
Repair: There may be an intermittent fault. Use the elec-
tronic service tool to perform a Wiggle Test. If no fault is
identified
If no fault is identified, proceed to Test Step 2.
2. Check For Active Diagnostic Codes
A. Turn the keyswitch to the OFF position.
B. Connect the electronic service tool to the diagnostic
connector.
C. Turn the keyswitch to the ON position.
D. Use the electronic service tool to monitor active diagnostic
codes or recently logged diagnostic codes. Look for an active
or logged code.
E. Turn the keyswitch to the OFF position.
Diagnostic codes Result: Diagnostic code 4783-3 or 3397-3 is active.
Proceed to Test Step 3.
Result: Diagnostic code 4783-4 or 3397-4 is active.
Proceed to Test Step 4.
Result: Diagnostic code 4783-12 or 3397-12 is active.
Proceed to Test Step 5.
Result: Diagnostic code 4783-21 or 3397-21 is active.
Proceed to Test Step 6.
3. Check for a High Voltage at the Soot Sensor
A. Turn the keyswitch to the ON position.
B. Measure the voltage across pins 1 and 2 on the soot sensor
connector.
C. Turn the keyswitch to the OFF position.
Greater than 32
VDC
Result: The supply voltage is within the acceptable
range for the soot sensor.
Return the unit to service
Result: The supply voltage is above the acceptable
range for the soot sensor.
Repair: Investigate the cause of the high voltage. Refer
to Systems Operation, Testing and Adjusting, “Charging
System - Inspect”.
(continued)
UENR4469-36 417
Circuit Tests
Copyright of Perkins Engine Company Limited. NOT FOR REPRINTING OR RESALE
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