Clutch Pedal Position Switch Circuit

175

TM 9-2320-312-24-2

Troubleshooting Section

Test Step 4. Check ECM Operation of the

Check Engine Lamp.

g00642525

Illustration 48

ECM Breakout T-connector

Results:

A. Disconnect ECM vehicle harness connector

J1/P1.

Yes The ECM is operating correctly. There is a

B. Insert a breakout T between ECM vehicle

problem in the vehicle wiring or the lamp. Repair

harness connector J1 and ECM vehicle harness

the vehicle wiring or the lamp, as required. STOP.

connector P1.

No Temporarily connect a test ECM. Check the

C. Connect a probe for the voltage test lamp to

operation of the check engine lamp when the test

terminal 65 (-battery) and connect the other

ECM is installed. If the problem is resolved with

probe to terminal 52 (unswitched +battery) of

the test ECM, then reconnect the suspect ECM. If

the breakout T.

the problem returns with the suspect ECM, then

replace the ECM. STOP.

D. The test lamp should turn on. If the test lamp

does not turn on, either the test lamp is faulty or

i01857608

the wiring to the ECM is faulty. Continue with this

Clutch Pedal Position Switch

step if the lamp turns on.

Circuit - Test

E. Leave the probe for the voltage test lamp

connected to terminal 52 (unswitched +battery).

SMCS Code: 1900-081-ZS

F. Connect the other probe of the test lamp to

System Operation Description:

terminal 28 (check engine lamp) of the breakout

Use this procedure under the following situation:

Refer to Illustration 48.

Use this procedure to determine if the clutch pedal

position switch is preventing normal operation of

G. Watch the voltage test lamp. Turn the ignition

cruise control, fast idle, idle set speed, or PTO

key switch to the ON position.

operation:

H. The lamp should turn on for five seconds. Then,

The following switch circuits can also prevent the

the lamp should turn off. The lamp will continue

correct operation of the cruise control, idle set

flashing if there is an active diagnostic code.

speed or PTO operation:

If there is an active diagnostic code, connect

ET in order to read the active diagnostic code.

service brake pedal position (switch 1)

Troubleshoot the problem.

service brake pedal position (switch 2)

Expected Result:

neutral switch

The check engine lamp turns on and the check

engine lamp turns off per the above description.

cruise control set/resume switch

cruise control on/off switch