Test Step 1. Inspect Electrical Connectors and Wiring -807640431

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TM 9-2320-312-24-2

Troubleshooting Section

Results:

OK Proceed to Test Step 2.

Not OK

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. Use ET to Check the Relay.

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

B. Access the special test"Engine Running Output"

on ET. The "Engine Running Output" test will

enable the engine running output when the test

is active.

C. Begin the "Engine Running Output" test and

listen for the relay to "click". You may need to be

near the engine in order to hear the "click".

Expected Result:

The relay activates when the special test is enabled.

Results:

g00832305

Illustration 89

Location for the ECM terminal

Yes The ECM and vehicle components are

operating correctly. STOP.

Test Step 1. Inspect Electrical Connectors

and Wiring.

No Proceed to Test Step 3.

A. Thoroughly inspect ECM vehicle harness

Test Step 3. Use ET to Check the ECM.

connector J1/P1, and the firewall bulkhead

connector.

A. Connect ET to the cab data link connector.

Refer to Troubleshooting, "Electrical Connectors

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

- Inspect" for details.

C. Disconnect the ECM vehicle harness connector

B. Perform a 45 N (10 lb) pull test on terminal 13

J1/P1.

in the ECM connector.

D. Connect a breakout T between ECM

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

connectorsJ1 and P1.

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

E. Connect a voltage test lamp to terminal 13

D. Check the harness and wiring for abrasion and

(Output 4) and terminal 65 (-battery) of the

for pinch points from the sensor to the ECM.

breakout T.

Expected Result:

Note: If the vehicle is a GM-560 application, connect

the voltage test lamp to terminal 31 (Output 9) and

All connectors, pins and sockets should be

terminal 65 (-battery) of the breakout T.

completely coupled and/or inserted and the harness

and wiring should be free of corrosion, abrasion

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

or pinch points.