Table 231
Troubleshooting Test Steps
Values Results
1. Inspect Electrical Connectors and Wiring
A. Turn the keyswitch to the OFF position.
B. Thoroughly inspect the P1 connector and any other con-
nectors that are included in the application for this throttle
switch. Refer to Troubleshooting, “Electrical Connectors - In-
spect” for details.
C. Perform a 45 N (10 lb) pull test on each of the wires in the
switch connector and the ECM connector that are associated
with the active diagnostic code.
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.
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 Throttle Cab Switch Position on the Electronic
Service Tool
A. Connect the electronic service tool to the diagnostic
connector.
B. Turn the keyswitch to the ON position.
C. Observe the status of the throttle switch and the throttle in-
puts on the electronic service tool while moving the throttle
switch to each position.
Throttle switch status
changes on the elec-
tronic service tool
Result: The throttle switch is functioning correctly. If
there are logged diagnostic codes for the throttle switch,
the fault may be intermittent.
Repair: Refer to Troubleshooting, “Electrical Connectors
- Inspect” in order to identify intermittent faults.
Result: Record the suspect input.
Proceed to Test Step 3.
3. Install a Jumper at the Throttle Switch Connector
A. Disconnect the connector for the throttle switch.
B. Observe the status of the suspect throttle input on the elec-
tronic service tool.
C. Connect a suitable jumper wire between terminal 1 on the
throttle switch connector and the terminal for the suspect throt-
tle input.
D. Observe the status of the suspect throttle input on the elec-
tronic service tool.
E. Remove the jumper wire.
Status is ON with
jumper installed
Status is OFF with
jumper removed
Result: The fault is in the throttle switch.
Repair: Install a replacement throttle switch.
Use the electronic service tool to clear all logged diag-
nostic codes and verify that the repair eliminates the
fault.
Result: The fault is not in the throttle switch.
Proceed to Test Step 4.
(continued)
440 UENR4469-36
Circuit Tests
Copyright of Perkins Engine Company Limited. NOT FOR REPRINTING OR RESALE
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