Troubleshooting

(Table 100, contd)
Troubleshooting Test Steps
Values Results
9. Create an Open Circuit at the ECM
A. Turn the keyswitch to the OFF position.
B. Disconnect the P2 connector from the ECM.
C. Turn the keyswitch to the ON position. Wait at least 30 sec-
onds for activation of the diagnostic codes.
D. Use the electronic service tool to check for active diagnos-
tic codes.
Note: Diagnostic codes for all of the engine sensors will be
active with the P2 connector disconnected. Ignore all other
codes and only look for codes that relate to the suspect valve.
E. Turn the keyswitch to the OFF position.
Diagnostic
codes
Result: An XXXX-5 diagnostic code is active with the P2 con-
nector disconnected.
The fault is in the wiring between the suspect valve connector
and the P2 ECM connector.
Replace the faulty wiring. Use the electronic service tool to
clear all logged diagnostic codes and verify that the repair
eliminates the fault.
Result: The XXXX-6 diagnostic code is still active with the P2
connector disconnected.
Proceed to Test Step 10.
10. Check if a Replacement ECM Eliminates the Fault
A. Contact the Dealer Solution Network (DSN).
B. If the DSN recommends the use of a replacement ECM, in-
stall a replacement ECM. Refer to Troubleshooting, “Replac-
ing the ECM”.
C. Use the electronic service tool to recheck the system for
active diagnostic codes.
Diagnostic
codes
Result: There are no active diagnostic codes with the replace-
ment ECM.
Reconnect the suspect ECM. If the fault returns with the sus-
pect ECM, replace the ECM.
Use the electronic service tool in order to clear all logged diag-
nostic codes and then verify that the repair eliminates the fault.
Result: The diagnostic code is still present with the replace-
ment ECM.
Contact the DSN.
i06231642
Speed Control - Test
This procedure covers the following codes:
Table 101
Diagnostic Trouble Codes for the Analog Throttle Position Sensors
J1939
Code
Description
Notes
91-3 Accelerator Pedal Position 1 : Voltage
Above Normal
The Electronic Control Module (ECM) detects that the signal from the throttle position sen-
sor is greater than the upper diagnostic limit for at least 0.2 seconds.
The warning lamp will flash. The engine will be derated.
29-3 Accelerator Pedal Position 2: Voltage
Above Normal
91-4 Accelerator Pedal Position 1 : Voltage Be-
low Normal
The ECM detects that the signal from the throttle position sensor is less than the lower di-
agnostic limit for at least 0.2 seconds.
The warning lamp will flash. The engine will be derated.
29-4 Accelerator Pedal Position 2: Voltage Be-
low Normal
If a fault occurs with the primary throttle and a
secondary throttle is installed, the engine will use the
secondary throttle until the fault is repaired.
If a fault occurs with the secondary throttle, the
engine will use the primary throttle until the fault is
repaired.
218 UENR0612-07
Circuit Tests
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