Change Oil Lamp Circuit

167

TM 9-2320-312-24-2

Troubleshooting Section

B. Disconnect vehicle harness connector J1/P1

A. Connect the Battery wires from the bypass

from the ECM.

harness of ET to a different battery that is not

on the vehicle.

C. Install an electronic service tool power bypass

cable. Connect a bypass harness to ECM

Expected Result:

connector J1.

ET is operating correctly.

Refer to Illustration 40 for the bypass harness.

Results:

Note: This bypass directly connects the circuit

Yes The vehicle battery is causing the problem.

for the ignition key switch to the ECM. The ECM

will remain powered until the connection to the

unswitched battery line "+" is disconnected.

Repair: Perform the following diagnostic

Remove the 20 Amp fuse from the in-line fuse

procedure:

holder to power down the ECM. Do Not connect the

bypass to the battery posts without first removing

Troubleshooting, "Ignition Key Switch Circuit and

the 20 Amp in-line fuse or do not remove the bypass

Battery Supply Circuit - Test"

from the battery posts without first removing the 20

Amp in-line fuse.

STOP.

Expected Result:

ET is operating correctly.

Repair: Perform the following repair:

Results:

1. Temporarily connect a test ECM.

Yes

2. Remove all jumpers and replace all connectors.

3. Recheck the system for active diagnostic

Repair: Perform the following repair:

codes.

There is a problem in the vehicle wiring, or

4. Repeat the test step.

another device in the vehicle is causing problems

on the data link. Either determine the device that

5. If the problem is resolved with the test ECM,

is causing the problem or send the vehicle to the

reconnect the suspect ECM.

OEM dealer for repair.

6. If the problem returns with the suspect ECM,

Verify that the repair eliminates the problem.

replace the ECM.

STOP.

7. Verify that the repair eliminates the problem.

No Verify that the 20 Amp fuse in the bypass

STOP.

harness of ET is not open. A fuse that is open is

a blown fuse. Proceed to Test Step 7.

i01614685

Test Step 7. Connect ET and the ECM to

Another Battery.

Change Oil Lamp Circuit - Test

SMCS Code: 1408-081; 7431-081

System Operation Description:

Batteries give off flammable fumes which can ex-

plode.

Use this procedure under the following situation:

To avoid injury or death, do not strike a match,

Note: This feature is only available with OCT01

cause a spark, or smoke in the vicinity of a battery.

Software.

Use this procedure to determine if the change oil

NOTICE

lamp (terminal 30 output 1) is operating properly.

Do Not connect the bypass harness to the battery un-

til the 20 Amp in-line fuse has been removed from the

+Battery line. If the fuse is not removed before con-

nection to the battery a spark may result.