
(Table 69, contd)
Troubleshooting Test Steps
Values
Results
12. Check the GCU control Wire for a Short Circuit
A. Turn the keyswitch to the OFF position.
B. Disconnect the P1/J1 connector. Disconnect the GCU.
C. Use a multimeter to measure the resistance between P1:52
and all other terminals on the P1 connector.
Greater than 1 k
Ohm
Result:
At least one of the resistance measurements is not
within the expected range.
There is a short circuit in the wiring between the GCU connec-
tor and the P1 ECM connector.
Repair the faulty wiring or 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:
All resistance measurements are within the expected
range.
Contact the Dealer Solution Network (DSN).
13. Check the Diagnostic Return Wire From the GCU
A. Turn the keyswitch to the OFF position.
B. Disconnect the GCU. Disconnect the P1/J1 connector.
C. Measure the resistance between pin 3 on the harness con-
nector for the GCU and P1:22.
Less than 5
Ohms
Result:
The measured resistance is greater than 5 Ohms.
There is an open circuit or high resistance in the wiring.
Repair the faulty wiring or replace the faulty wiring.
Result:
The measured resistance is less than 5 Ohms.
Contact the Dealer Solution Network (DSN).
i06012069
Idle
Validation
-
Test
This procedure covers the following diagnostic codes.
Table 70
Diagnostic Trouble Codes
J1939
Code
Code Description
Comments
558-2
Accelerator Pedal 1 Low Idle Switch :
Erratic, Intermittent, or Incorrect
The Electronic Control Module (ECM) detects one of the following conditions:
The signal voltage from the throttle pedal is less than 1.05 V for 0.3 seconds while the idle
validation switch is not active.
The signal voltage from the throttle pedal is greater than 1.25 V for 0.3 seconds while the
idle validation switch is active.
The warning lamp will flash. The engine will be derated.
2970-2
Accelerator Pedal 2 Low Idle Switch :
Erratic, Intermittent, or Incorrect
Follow the troubleshooting procedure in order to identify the root cause of the problem.
If the application is equipped with two throttles, the
engine will use the second throttle until the fault is
repaired.
If a second throttle is not installed or if the second
throttle has a fault, the following conditions will occur:
UENR0612
137
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