Test Step 5. Monitor ET while the Accelerator Pedal Position Sensor is Being Disconnected

147

TM 9-2320-312-24-2

Troubleshooting Section

Test Step 6. Check the Status of the

Expected Result:

PTO On/Off Switch and the Status of the

Power Train Data Link with ET

The measured voltage is between 7.5 VDC and 8.5

VDC for the pedal mounted throttle position sensor

that is used in the cab.

A. Check the status of the "PTO ON/OFF Switch"

on ET in order to verify that the "PTO ON/OFF

Results:

Switch" is off. The PTO mode may cause the

ECM to ignore the accelerator pedal position

OK Proceed to Test Step 8.

sensor if the "PTO Configuration" is programmed

to one of the following parameters:

Not OK The sensor is not receiving the correct

voltage. Proceed to Test Step 5.

Remote Switches

Test Step 5. Monitor ET while the

Remote Throttle

Accelerator Pedal Position Sensor is

Being Disconnected

Cab Switches

Note: If the "PTO Configuration" is programmed to

A. Access the active diagnostic code screen on ET.

"Cab Switches" and the "PTO Cab Controls RPM

Ensure that one of the following diagnostic code

Limit" is programmed to "Low Idle", the PTO mode

is active before proceeding:

may cause the ECM to ignore the accelerator pedal

41-03 8 Volt Supply Above Normal (21)

position sensor. This will occur when the "PTO

ON/OFF Switch" is in the ON position.

41-04 8 Volt Supply Below Normal (21)

B. Start the engine. While the "Throttle Position"

status is being monitored on ET, depress the

B. Monitor the active diagnostic code screen while

accelerator pedal and release the accelerator

the accelerator pedal position sensor is being

pedal. The "Throttle Position" status and the

disconnected and reconnected.

engine should respond to the change in the

accelerator pedal position.

Expected Result:

C. Go to the "System Troubleshooting Settings"

One of the following diagnostic codes is still active

portion of ET and turn off the "Power Train Data

after the accelerator pedal position sensor has been

Link".

disconnected:

41-03 8 Volt Supply Above Normal (21)

D. While the "Throttle Position" status is being

monitored on ET, depress the accelerator

41-04 8 Volt Supply Below Normal (21)

pedal and release the accelerator pedal. Also

depress the accelerator pedal and release the

accelerator pedal while the engine response is

Results:

being monitored.

OK Ensure that the accelerator pedal position

Expected Result:

sensor has been reconnected before continuing.

Proceed to Test Step 7.

The "Throttle Position" status and the engine should

Not OK

respond to the change in the accelerator pedal

position.

Repair: Perform the following diagnostic

Result 1 The cab accelerator functions properly.

procedure:

Result 2 The throttle response is limited by a power

Temporarily install another accelerator pedal

train data link message.

position sensor. Use ET to check for an active +8

V diagnostic code. Replace the accelerator pedal

Result 3 The PTO limits the throttle response.

position sensor if both of the following conditions

occur:

Results:

The problem is corrected with the new

Result 1 The accelerator pedal position sensor

accelerator pedal position sensor.

is operating correctly. Continue troubleshooting

The problem returns after the old accelerator

until the original condition is resolved. STOP.

pedal position sensor has been reconnected.

STOP.