Test Step 8. Remove the Remote Accelerator Position Sensor From the Accelerator Pedal Assembly

371

TM 9-2320-312-24-2

Troubleshooting Section

Expected Result:

The duty cycle is between 10 and 22 percent with

the accelerator pedal assembly in the low idle

position, and the duty cycle is between 75 and 90

percent with the accelerator pedal assembly in the

high idle position.

Results:

OK A good signal from the remote accelerator

position sensor is reaching the ECM. Verify that

the ECM is receiving the proper battery voltage. If

the ECM is receiving the proper battery voltage,

temporarily connect a test ECM and verify that the

problem is resolved. If the problem disappears

with the test ECM, reconnect the suspect ECM.

If the problem returns with the suspect ECM,

replace the ECM. STOP.

Not OK There is a problem with signal wire

for the remote accelerator position sensor in the

vehicle wiring harness. Proceed to Test Step 9.

Test Step 8. Remove the Remote

Accelerator Position Sensor From the

Accelerator Pedal Assembly

A. Turn the ignition key switch to the OFF position.

B. Remove the remote accelerator position sensor

from the accelerator pedal assembly. Note

sensor orientation in the accelerator pedal

assembly, and the sensor pigtail routing prior to

sensor removal. Thoroughly inspect the pigtail

for signs of abrasion.

C. Connect the multimeter that is capable of

measuring a PWM duty cycle to terminal "C" of

the breakout T.

D. Turn the ignition key switch to the ON position.

E. Display the duty cycle output of the remote

accelerator position sensor while the sensor slot

is released. Use a screwdriver to advance the

sensor slot to the maximum position. Refer to

Illustration 166.

When the sensor is removed from the accelerator

pedal assembly the following diagnostic codes

may be generated:

30-13 PTO Throttle Sensor Calibration (29)

The diagnostic code should disappear when

the sensor is properly assembled back into the

accelerator pedal assembly.