ADAPTER-TIP 1193253 - Caterpillar

System Operation Description:Use this procedure under the following situation:Use this procedure if any of the following diagnostic codes are indicated:
91-08 Throttle position invalid (32)
91-13 Throttle position out of calibration (28)
41-03 8 Volt supply voltage high (21)
41-04 8 Volt supply voltage low (21)Also, use this procedure if the accelerator pedal position sensor is suspected of improper operation.Accelerator Pedal Position SensorThe 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 width modulated signal (PWM) and this output 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 a duty cycle 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 the 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 dedicated PTO functions, the accelerator pedal position sensor will be ignored while the engine is in PTO mode and the "PTO Configuration" is programmed to one of the following parameters:
Remote switches
Remote throttleNote: 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.The ECM is in PTO mode if the "PTO On/Off Switch" is on. This can be checked with Caterpillar Electronic Technician (ET). Refer to Troubleshooting, "PTO Switch Circuit - Test" for testing if the PTO is being used.
Illustration 1 g00642016
This is a typical schematic for cab accelerator pedal position sensor.
The return wire may be connected to P1-3, P1-5, or P1-18.
Illustration 2 g01150754
Pin locations for ECM connector
(P1-3) Input sensor
(P1-4) + 8V
(P1-5) "Accelerator pedal sensor/switch sensor" Test Step 1. Inspect Electrical Connectors and Wiring
Thoroughly inspect ECM vehicle harness connector J1/P1, the firewall bulkhead connector and the accelerator pedal position sensor connector. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector that are associated with the accelerator pedal position sensor:
P1-3
P1-4
P1-5
P1-66
Check the ECM connector (allen head screw) for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Check the harness and wiring for