Test Step 1. Inspect Electrical Connectors and Wiring -807640468

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TM 9-2320-312-24-2

Troubleshooting Section

Test Step 1. Inspect Electrical Connectors

C. Monitor the status of the ignition key switch while

and Wiring.

the ignition key switch is being cycled slowly

from the ON position to the OFF position.

A. Thoroughly inspect ECM vehicle harness

Note: ET may indicate that a new ECM has been

connector J1/P1, the battery connections and

detected. This condition is normal, due to a

the connections to the ignition key switch. Refer

powerdown of the ECM with the ignition key switch

to Troubleshooting, "Electrical Connectors -

in the OFF position.

Inspect" for details.

Note: Cycling the ignition key switch several times

B. Perform a 45 N (10 lb) pull test on each of the

may cause additional 43-02 faults to be logged.

wires in the ECM connector that are associated

This is normal. Clear any logged faults.

with the following connections:

Unswitched +battery (terminals 52 and 53)

Expected Result:

-Battery (terminals 65 and 67)

The status of the ignition key switch changes from

"On" with the ignition key switch in the ON position

Ignition Key Switch (terminal 70)

to "Off" with the ignition key switch in the OFF

position.

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

Results:

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

YES The input for the ignition key switch is

D. Check the harness and wiring for abrasion and

functioning properly at this time.

pinch points from the battery to the ECM, and

from the ignition key switch to the ECM.

Repair: If an intermittent connection is suspected,

refer to Troubleshooting, "Electrical Connectors

Expected Result:

- Inspect". Excessive cycling of the ignition key

switch can cause this fault to be logged. This is

All connectors, pins and sockets should be

normal. Clear any logged faults.

completely coupled and/or inserted and the harness

and wiring should be free of corrosion, abrasion

STOP.

or pinch points.

NO Proceed to Test Step 3.

Results:

Test Step 3. Check the Battery Voltage at

OK, Troubleshooting a 43-02 Code Proceed to

the ECM.

Test Step 2.

OK, Troubleshooting a 168-02 Code Proceed

Perform Steps A, B, and C if the following

to Test Step 3.

diagnostic code is active or logged:

Not OK There is a problem with the connectors

168-02 Intermittent Battery (51)

or wiring.

A. Disconnect vehicle harness connector P1 from

Repair: Repair the connectors or wiring and/or

ECM connector J1 and insert a breakout T.

replace the connectors or wiring. Ensure that all

of the seals are properly in place and ensure that

B. Measure the voltage between vehicle harness

the connectors are completely coupled.

connector P1 terminal 52 (unswitched +battery)

and terminal 65 (-battery).

STOP.

Test Step 2. Use ET to Check the Ignition

Key Switch.

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

B. Connect ET to the cab data link connector and

access the status screen that shows the status

of the ignition key switch.