(Table 229, contd)
Troubleshooting Test Steps
Values Results
9. Disconnect the Sensors One at a Time
A. Turn the keyswitch to the OFF position.
B. Disconnect the engine speed/timing sensors one at a time.
Wait 30 seconds after each sensor is disconnected. Use the
electronic service tool to monitor the diagnostic codes.
Note: The 3512-X or 3483-X diagnostic code will become in-
active when the sensor that caused the 8 VDC diagnostic
code is disconnected.
Diagnostic code Result: The 3512-X or 3483-X diagnostic code is not ac-
tive when all of the sensors are disconnected.
Repair: Replace the suspect sensor.
Use the electronic service tool to clear all logged diag-
nostic codes and verify that the repair eliminates the
fault.
Result: The 3512-X or 3483-X diagnostic code is still
active.
Proceed to Test Step 10.
10. Check the 8 VDC Supply from 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.
D. Measure the voltage from J2:18 on the ECM to a suitable
ground.
7.5 to 8.5 VDC Result: The 8 VDC supply voltage from the ECM is with-
in specification. The fault is in the harness.
Repair: Repair the faulty connectors or replace the har-
ness. Reconnect all sensor and ECM connectors. En-
sure that all of the seals are correctly in place. Ensure
that all 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: The 8 VDC supply voltage from the ECM is out-
side the specified limits.
Contact the Dealer Solutions Network (DSN).
i06167061
Switch Circuits - Test
(Multiposition Throttle Switch)
This procedure covers the following diagnostic
codes:
Table 230
Diagnostic Trouble Codes for Throttle Switch
J1939 Code PDL Code
Code Description
(code descriptions may vary)
Comments
29-2 774-2
Accelerator Pedal Position 2 : Erratic, Inter-
mittent or Incorrect
The Electronic Control Module (ECM) detects the following
condition:
There is an invalid combination of positions for the multi-posi-
tion switch.
If equipped, the warning light will come on. The ECM will log
the diagnostic code.
91-2 91-2
Accelerator Pedal Position 1 : Erratic, Inter-
mittent or Incorrect
Follow the troubleshooting procedure in order to identify the root cause of the fault.
438 UENR4469-36
Circuit Tests
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