Illustration 32 Connections for the Test Lamp

157

TM 9-2320-312-24-2

Troubleshooting Section

Reconnect the wire to the relay terminal.

Proceed to Test Step 7.

Test Step 4. Check the Voltage at the

Electrical Connector P501 for the Air Inlet

Heater Relay

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Illustration 32

Connections for the Test Lamp

D. Disconnect J501/P501 and insert the jumper

wires in the electrical connectors.

E. Connect a voltage test lamp from the

disconnected relay terminal to the jumper wire

that is connected to J501 and P501 terminals.

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

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

electronic service tool.

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

Note: Do not leave the "Intake Air Heater Enable

Test" on. Avoid unnecessary cycling of the air

inlet heater in order to prevent the battery from

discharging. The "Intake Air Heater Enable Test"

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Illustration 33

has a one minute timer in order to disable the test

when the time expires.

A. Disconnect the connector J501/P501 for the air

inlet heater relay.

Expected Result:

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

The test lamp turned on and the test lamp turned

inlet heater's lamp is still connected.

off with the "Intake Air Heater Enable Test".

C. Connect a voltage test lamp to the two terminals

Results:

of the engine harness side P501 connector of

the air inlet heater relay.

Yes

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

Repair: The air inlet heater relay and the +battery

connection to the air inlet heater relay are OK.

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

Leave the wire disconnected from the relay

electronic service tool.

terminal.

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

Proceed to Test Step 6.