Test Step 10. Check Battery Voltage to the Connector P501 for the Air Inlet Heater Relay

160

TM 9-2320-312-24-2

Troubleshooting Section

Repair: Repair the wiring from connector J648:A

for the lamp. Verify that the problem has been

resolved.

STOP.

Test Step 10. Check Battery Voltage

to the Connector P501 for the Air Inlet

Heater Relay

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

B. Ensure that the connector J648/P648 for the air

inlet heater's lamp is connected.

C. Disconnect the connector J501/P501 for the air

inlet heater relay.

D. Connect a voltage test lamp from the connector

P501:1 for the air inlet heater relay to the engine

ground stud.

g00727433

Illustration 35

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

Connections for the Breakout T

Expected Result:

C. Disconnect the ECM engine harness connector

J2/P2. Install a breakout T on the ECM connector

The voltage test lamp comes on and the voltage

J2 only.

test lamp stays on when the ignition key switch is

in the ON position.

D. Connect a voltage test lamp from the connector

J648:A to the terminal 8 of the breakout T. Refer

Results:

to Illustration 34.

Yes Proceed to Test Step 11.

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

F. Go to the "Intake Air Heater Enable Test" on the

electronic service tool.

Repair: Repair the wiring from J648:A to P501:1.

Verify that the problem is resolved.

G. Start the test and watch the voltage test lamp.

STOP.

Note: Do not leave the "Intake Air Heater Enable

Test" on. Avoid unnecessary cycling of the air

Test Step 11. Check the ECM

inlet heater in order to prevent the battery from

discharging. The "Intake Air Heater Enable Test"

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

has a one minute timer in order to disable the test

when the time expires.

B. Disconnect the connector J648/P648 for the air

inlet heater's lamp.

Note: When ECM engine harness connector J2/P2

is disconnected and the ignition key switch is in

the ON position, open circuit diagnostic codes will

be active or logged for all of the engine sensors.

This is normal.

Expected Result:

The test lamp turned on and the test lamp turned

off with the "Intake Air Heater Enable Test".

Results:

Yes