KIT-GASKET(WP) 3235232 - Caterpillar

Use this procedure to troubleshoot the electrical system if a problem is suspected with the circuit that is for the throttle position sensor. Also use this procedure if one of the diagnostic codes in Table 1 is active or easily repeated.Note: Some of the following codes may not be applicable for certain applications.Note: Performing steps within this procedure requires the use of a multimeter capable of measuring a PWM duty cycle and frequency. Refer to Table 2 for the tools recommended for the procedure.
Table 1
J1939 Code and Description CDL Code and Description Comments
29-2
Accelerator Pedal Position #2 : Erratic, Intermittent, or Incorrect 774-2
Secondary Throttle Position Sensor : Erratic, Intermittent, or Incorrect The Electronic Control Module (ECM) has detected an invalid combination of positions for the multi-position switches.
The code is logged. If equipped, the warning light will come on.
Engine RPM defaults to a predetermined safe speed. The throttle switch is ignored by the ECM until the fault is cleared and the keyswitch is cycled.
29-3
Accelerator Pedal Position #2 : Voltage Above Normal 774-3
Secondary Throttle Position Sensor : Voltage Above Normal The ECM detects signal voltage that is not in the acceptable range.
The code is logged. The ECM flags the throttle position as invalid data and a default value is used.