Table 236
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 valve position 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 J2 ECM connector for the correct
torque 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.
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 of 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 corro-
sion, abrasion, and pinch points.
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. Wait at least 10 sec-
onds for activation of the diagnostic codes.
D. Use the electronic service tool in order to monitor active di-
agnostic codes or recently logged diagnostic codes.
E. Turn the keyswitch to the OFF position.
Diagnostic codes Result: One or more of the preceding diagnostic codes
are active or recently logged.
Proceed to Test Step 3.
Result: None of the preceding diagnostic codes are ac-
tive or recently logged.
Repair: The fault may be intermittent. Refer to Trouble-
shooting, “Electrical Connectors - Inspect”.
Perform a “Wiggle Test” by using the electronic service
tool in order to identify intermittent connections.
3. Measure the Supply Voltage at the Valve Connector
A. Turn the keyswitch to the OFF position.
B. Disconnect the suspect valve from the harness.
C. Turn the keyswitch to the ON position.
D. Measure the voltage between terminals 1 and 2 at the con-
nector for the valve.
E. Reconnect the valve to the harness.
4.84 to 5.16 VDC Result: The sensor supply voltage is out of the nominal
range. The fault is in the engine harness between the
valve connector and the ECM.
Repair: Repair the faulty valve connector or replace the
faulty harness.
Use the electronic service tool to clear all logged diag-
nostic codes and verify that the repair eliminates the
fault.
Result: The sensor supply voltage is correct.
Proceed to Test Step 4.
(continued)
UENR4469-36 447
Circuit Tests
Copyright of Perkins Engine Company Limited. NOT FOR REPRINTING OR RESALE
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