Idle Shutdown Timer

284

TM 9-2320-312-24-2

Troubleshooting Section

I. Monitor the "Active Diagnostic Code" screen for

6. If the problem returns with the suspect ECM,

either the open circuit diagnostic code for the

replace the ECM.

sensor or the short circuit diagnostic code for

the sensor.

7. Verify that the repair eliminates the problem.

Expected Result:

STOP.

Test Step 8. Bypass the Harness Wiring

The diagnostic code disappears when the jumper

Between the ECM and the Sensor

is installed.

Connector.

Results:

OK There is a problem in the wiring harness.

Repair: Perform the following repair:

1. Repair the faulty wiring harness or replace the

faulty wiring harness.

2. Clear all diagnostic codes.

3. Verify that the repair eliminates the problem.

STOP.

Not OK Restart this procedure and carefully

perform each step. STOP.

i01618462

Idle Shutdown Timer - Test

g00844988

Illustration 117

SMCS Code: 1900-081

Terminal locations for ECM connector P1

System Operation Description:

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

Use this procedure under the following situation:

B. Disconnect ECM vehicle harness connector

J1/P1, and the sensor connector.

Use this procedure to determine if the idle shutdown

timer is operating correctly.

C. Remove the wire for the sensor supply and the

wire for the sensor common from ECM connector

The following background information is related

P1 on the harness.

to this procedure:

D. Remove the wire for the sensor supply and the

Idle Shutdown Timer

wire for the sensor common from the sensor

connector on the harness.

The idle shutdown timer is intended to improve fuel

economy by limiting idling time.

E. Fabricate jumper wires that are long enough to

reach from the ECM to the sensor connector.

The idle shutdown timer is a Customer Specified

Parameter that may be programmed for any period

F. Insert the jumper wires into the ECM connector

from 3 to 1440 minutes.

P1 on the vehicle harness. Insert the other end

of the wires into the sensor connector of the

The timer is activated when all of the following

vehicle harness.

conditions are met regardless of the position of the

parking brake:

G. Reconnect ECM vehicle harness connector

J1/P1 and the sensor connector.

The vehicle speed is 0.

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