
(Table 100, 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.
Note:
The control of the engine speed may not switch be-
tween throttles unless both throttles are in the low idle
position.
The throttle may be overridden by using the SAE J1939 (CAN)
data link or a PTO control.
Switch status
Result:
If the status of the throttle selection switch is shown in
the OFF position, then the throttle 1 has control of the engine
speed.
If the throttle selection switch status is shown in the ON posi-
tion, then the throttle 2 has control of the engine speed.
The throttle selection switch is operating correctly.
There may be an intermittent fault. Refer to Troubleshooting,
“Electrical Connectors - Inspect” in order to identify intermittent
faults.
Result:
The incorrect throttle is selected.
Change to the other throttle. There may be a fault with the se-
lector switch input.
Check the connections between the throttle selection switch
and P1:62 and battery -. Refer to Troubleshooting, “Electrical
Connectors - Inspect”. Refer to the Electrical Schematic for the
application.
5. Check the Voltage at the Sensor
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 V terminal and the sen-
sor ground terminal on the harness connector for the sensor.
4.9 V to 5.1 V
Result:
The measured voltage is not within the expected
range.
The fault is in the 5 V supply wire or the ground wire between
the throttle position sensor and the ECM.
Check all wiring between the suspect sensor and the ECM. Re-
fer to the Electrical Schematic for the application.
Replace the faulty wiring.
Use the electronic service tool to clear all logged diagnostic co-
des and verify that the repair eliminates the fault.
Result:
The measured voltage is within the expected range.
Proceed to Test Step 8.
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. Record all active diagnostic codes.
Diagnostic
codes
Result:
An XX-3 diagnostic code is active at this time.
Proceed to Test Step 7.
Result:
An XX-4 diagnostic code is active at this time.
Proceed to Test Step 9.
Result:
There are no active diagnostic codes for the throttle po-
sition sensors.
The fault may be intermittent. Refer to Troubleshooting, “Electri-
cal Connectors - Inspect”.
(continued)
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UENR0612
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