DEFINITION: The A/C compressor does not engage when requested by the operator.

1. Connect the scan tool.
2. Start the engine.

Are any compressor disabling diagnostic trouble codes set by the dash integration module (DIM) or the powertrain control module (PCM)?

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Go to the appropriate Diagnostic Trouble Code (DTC) table

Go to Step 2

Using the scan tool view DIM data.

Is the A/C Clutch (Actual) ON?

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Go to Step 9

Go to Step 3

Using the scan tool view A/C pressure status. Is the A/C pressure status NORMAL?

NORMAL

Go to Step 4

Go to Step 6

Using the scan tool view the Battery voltage.

Is the battery voltage greater then the specified value?

10.5 V

Go to Step 5

Go to Charging System Check

Using the scan tool view the A/C temperature status.

Is the A/C temperature status OK?

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Go to Step 6

Go to Cooling Insufficient - Air Conditioning (A/C) Inoperative

Using the scan tool view the system pressure.

Is the system pressure low?

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Go to Cooling Insufficient - Air Conditioning (A/C) Inoperative

Go to Step 7

Inspect the A/C CLU fuse for an open.

Is the A/C CLU fuse open?

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Go to Step 8

Go to Step 10

Replace the A/C CLU fuse.

Is the A/C CLU fuse replaced?

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Go to Step 19

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1. Using the control assembly request A/C operation.
2. Measure the voltage at the compressor clutch between terminals A and B.

Is the voltage measured greater then the specified value?

10.5 V

Go to Step 15

Go to Step 7

Measure the voltage between terminal A of the compress clutch and ground.

Is the voltage measured greater then the specified value?

10.5 V

Go to Step 16

Go to Step 11

1. Remove the A/C CLU relay.
2. Measure voltage at A/C CLU relay terminal 30.

Is the voltage measured greater then the specified value?

10.5 V

Go to Step 17

Go to Step 12

Measure voltage to the A/C CLU relay terminal 86.

Is the voltage measured greater then the specified value?

10.5 V

Go to Step 13

Go to Step 19

Measure voltage at terminal 27 CKT 459 (DK GRN/WHT) at the PCM.

Is the voltage measured greater then the specified value?

10.5 V

Go to Step 18

Go to Step 14

Inspect CKT 459 (DK GRN/WHT) for an open or short to battery voltage.

Is the repair complete?

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Go to Step 20

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Replace the compressor. Refer to Air Conditioning Compressor Replacement .

Is the repair complete?

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Go to Step 20

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Inspect CKT 1550 (BLK) for an open condition.

Is the repair complete?

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Go to Step 20

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Replace the A/C CLU relay.

Has the A/C CLU relay been replaced?

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Go to Step 20

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Replace the PCM. Refer to PCM replacement in Engine Controls.

Is the repair complete?

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Go to Step 20

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1. Inspect terminal 86 for proper terminal contact.
2. Repair an open condition.

Is the repair complete?

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Go to Step 20

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Confirm proper operation of the A/C compressor.

Is the A/C compressor operating correctly?

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System OK

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