Test Step 1. Inspect Electrical Connectors and Wiring -807640447

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TM 9-2320-312-24-2

Troubleshooting Section

Repair: Perform the following repair:

Repair the connectors or wiring and/or replace

the connectors or wiring. Ensure that all of the

seals are properly in place and ensure that the

connectors are completely coupled.

Verify that the repair eliminates the problem.

STOP.

Test Step 2. Connect ET and Check the

Accelerator Pedal Position Sensor and

the Clutch Pedal Position Switch.

A. Ensure that the cruise control on/off switch is

OFF.

B. Connect ET at the cab data link connector.

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

D. Use the following procedure to check the

accelerator pedal position sensor:

a. Monitor the duty cycle of the throttle sensor on

ET. Access the "Accelerator Pedal Position"

display screen.

g00729019

Illustration 101

b. While the duty cycle is being monitored on ET

ECM terminal

depress the accelerator pedal and release

Test Step 1. Inspect Electrical Connectors

the accelerator pedal. Repeat this action

and Wiring.

several times.

A. Thoroughly inspect ECM connectors J1/P1

E. If a manual transmission is installed, use the

and the firewall bulkhead connector. Refer

following procedure to check the status of the

to Troubleshooting, "Electrical Connectors -

"Clutch Pedal Position Switch":

Inspect" for details.

a. Access the status screen onET for the "Clutch

B. Perform a 45 N (10 lb) pull test on each of the

Pedal Position Switch".

wires in the ECM connector that are associated

with the connections for the circuit for the

b. While the status screen is being monitored on

exhaust brakes.

ET, depress the clutch pedal and release the

clutch pedal. Repeat this action several times.

C. Check the ECM connector (allen head screw) for

the proper torque of 6.0 Nm (55 lb in).

Expected Result:

D. Check the harness and wiring for abrasion and

The duty cycle of the accelerator pedal position

for pinch points from the sensor to the ECM.

sensor is between 3 percent and 100 percent. The

status of the "Clutch Pedal Position Switch" on ET

Expected Result:

changes from OFF to ON when the clutch pedal is

depressed. The status of the "Clutch Pedal Position

All connectors, pins, and sockets should be

Switch" on ET changes from ON to OFF when the

completely coupled and/or inserted and the harness

clutch pedal is released.

and wiring should be free of corrosion, abrasion

or pinch points.

Results:

OK Proceed to Test Step 3.

OK Proceed to the Test Step 2.

Not OK Incorrect accelerator pedal position

Not OK

Repair: Perform the following diagnostic

procedure: