Table 225
Troubleshooting Test Steps
Values Results
1. Inspect Electrical Connectors and Wiring
A. Thoroughly inspect the terminal connections on the P1/J1
ECM connector and the analog throttle position sensors.
Refer to Troubleshooting, “Electrical Connector - Inspect”.
B. Perform a 45 N (10 lb) pull test on each of the wires in the
ECM connector and the analog throttle position sensor con-
nectors that are associated with the active diagnostic code.
C. Check the screw for the ECM connector for the correct tor-
que of 6 N·m (53 lb in).
D. Check the harness for corrosion, abrasion, and pinch points
from the analog throttle position sensors 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. Verify if any of the diagnostic codes that are listed in Table
224 are active.
E. Turn the keyswitch to the OFF position.
Diagnostic codes Result: There are no active diagnostic codes for the
analog throttle position sensors.
Proceed to Test Step 3.
Result: One or more of the diagnostic codes listed in Ta-
ble 224 is active.
Proceed to Test Step 5.
3. Check the Throttle Position with the Electronic Service
Tool
A. Connect the electronic service tool to the diagnostic
connector.
B. Turn the keyswitch to the ON position. Do not start the
engine.
C. Observe the throttle position reading on the electronic serv-
ice tool.
D. Operate the throttle over the full range of movement.
20 percent to 27 per-
cent at low idle.
80 percent to 87 per-
cent at high idle
Result: The ECM is not receiving the correct signal from
the sensor.
Repair: Use the electronic service tool to verify that the
throttle has been configured correctly before continuing
with this procedure.
If the fault is still present after the throttle has been con-
figured correctly, replace the analog throttle position
sensor.
Result: The sensor is operating correctly.
Proceed to Test Step 4.
(continued)
UENR4469-36 421
Circuit Tests
Copyright of Perkins Engine Company Limited. NOT FOR REPRINTING OR RESALE
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