(Table 225, contd)
Troubleshooting Test Steps
Values Results
4. Check the Throttle Selection Status with the Electronic
Service Tool
A. Check the status of the throttle selection switch (if
equipped). Use the electronic service tool in order to check
the status of the throttle selection switch.
Throttle 1 has control
when status is “OFF”
.
Throttle 2 has control
when status is ON.
Result: The throttle section switch is operating correctly.
Return the engine to service.
If an intermittent fault exists, refer to Troubleshooting,
“Electrical Connector - Inspect”
Result: The wrong throttle is selected.
Repair: Switch to the other throttle. There may be a fault
with the selector switch input.
Check the connections between the throttle selection
switch and the P1 connector. Refer to Troubleshooting,
“Electrical Connector - Inspect”.
5. Check the Sensor Supply Voltage
A. Turn the keyswitch to the OFF position.
B. Disconnect the connector for the suspect throttle position
sensor.
C. Turn the keyswitch to the ON position.
D. Measure the voltage between the 5 VDC terminal and the
ground terminal on the harness connector for the sensor.
4.84 VDC to 5.16
VDC
Result: The correct supply voltage is not reaching the
sensor. The fault is in the 5 VDC supply wire or the
ground wire between the suspect throttle position sensor
and the P1 connector.
Repair: Repair the faulty wiring or replace the faulty
wiring.
Use the electronic service tool to clear all logged diag-
nostic codes and verify that the repair eliminates the
fault.
Result: The supply voltage is reaching the sensor.
Proceed to Test Step 6.
6. Verify the Type of Active Diagnostic Code
A. Turn the keyswitch to the ON position. Wait at least 10 sec-
onds for activation of the diagnostic codes.
B. Use the electronic service tool to check for active diagnostic
codes that are listed in Table 224 . Record all active diagnostic
codes.
Diagnostic codes Result: A -3 diagnostic code is active.
Proceed to Test Step 7.
Result: A -4 diagnostic code is active.
Proceed to Test Step 9.
Result: There are no active diagnostic codes for the
throttle position sensors - The fault may be intermittent.
Repair: Refer to Troubleshooting, “Electrical Connector
- Inspect”.
(continued)
422 UENR4469-36
Circuit Tests
Copyright of Perkins Engine Company Limited. NOT FOR REPRINTING OR RESALE
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