Test Step 6. Connect the ET Directly to the ECM

166

TM 9-2320-312-24-2

Troubleshooting Section

Results:

Yes The ECM is currently receiving the correct

voltage. Proceed to Test Step 6.

No The ECM is not receiving the correct

voltage. Ensure that there is not an aftermarket

engine protection switch that is overriding battery

power to the ECM.

Repair: Perform the following diagnostic

procedure:

Troubleshooting, "Ignition Key Switch Circuit and

Battery Supply Circuit - Test"

STOP.

Test Step 6. Connect the ET Directly to

the ECM.

g00741090

Illustration 40

NOTICE

Do Not connect the bypass harness to the battery un-

Batteries give off flammable fumes which can ex-

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

plode.

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

nection to the battery a spark may result.

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

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

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