Caterpillar C9 Engine Throttle Position Out of Calibration 28 91-13 Trouble Solution

This instruction show you guide on how how to solve trouble code 28 PID 91-13 throttle position out of calibration.

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The Engine Control Module (ECM) detects the following conditions:

The 8 volt supply is less than 7.5 VDC for more than one second.

The ECM has been powered for more than three seconds.

The accelerator pedal position sensor is used to provide a throttle position signal to the Engine Control Module (ECM).Sensor output is a constant frequency signal with a pulse width that varies with the pedal position.This output signal is referred to as either a duty cycle or a pulse with modulated signal(PWM) and this out signal is expressed as a percentage between 3 and 100 percent.

The accelerator pedal position sensor is attached directly to the accelerator pedal assembly. The accelerator pedal position sensor requires no adjustment.

The accelerator pedal position sensor will produce duty cyle of 10 to 22 percent at low idle and 75 to 90 percent when the accelerator pedal is fully depressed.The percent of duty cycle is translated in the ECM into an accelerator pedal position of 3 to 100 percent.

The accelerator pedal position sensor is powered by the ECM supply voltage (+8 VDC) from connector P1-4 to terminal “A” of he accelerator pedal position sensor connector.The accelerator pedal position sensor can be replaced separately from the pedal assembly. An incorrectly calibrated pedal assembly can not be adjusted. The entire pedal assembly must be replaced.

If the vehicle is using the ECM dedicate PTO functions,the accelerator pedal position sensor will be ignored while the engine in PTO mode in the “PTO Configuration” i programmed to one of the following parameters:

Remote switches

Remote throttle

Note; In the cab switches configuration, the cab accelerator pedal can be used in order to control the engine rpm for the PTO operation.The cab accelerator pedal can also be ignored in the”Cab Switches” PTO configuration. Programming of customer parameters is required in order to ignore the cab accelerator pedal in the”Cab switches” configuration.

Probable Causes:

1 ECM Connection

2 Accelerator pedal position sensor or harness

3 Wiring between accelerator pedal position sensor and ECM

4 ECM Failure

5 Accerlerator pedal assembly

More repair case for Caterpillar machine,please refer to:Caterpillar Machine Repair

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