Did you perform the OBD II System Check been performed?

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Go to Step 2

Go to Powertrain On Board Diagnostic (OBD) System Check (5.0L/5.7L); Powertrain On Board Diagnostic (OBD) System Check (7.4L)

1. Remove the I/P Cluster.
2. Disconnect the Ignition Coil connector.
3. Connect a J 39200 DMM (continuity) between I/P Cluster connector cavity 6 and ground.

Is continuity present?

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Go to Step 3

Go to Step 4

Locate and repair the short to ground in CKT 121 (WHT) between the Ignition Coil and the I/P cluster. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

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Go to Instrument Cluster System Check

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Connect a J 39200 DMM (continuity) from I/P Cluster cavity 6 to ignition coil connector cavity B.

Is continuity present?

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Go to Step 5

Go to Step 6

Replace the I/P Cluster. Refer to Instrument Cluster Replacement .

Is the repair complete?

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Go to Instrument Cluster System Check

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Locate and repair the open in CKT 121 (WHT) between the Ignition Coil and the I/P Cluster. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

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Go to Instrument Cluster System Check

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Did you perform the Instrument Cluster System Check?

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Go to Step 2

Go to Instrument Cluster System Check

1. Disconnect the connector at the instrument cluster.
2. Disconnect the connector at the generator.
3. Connect a J 35616-200 test lamp between generator connector cavity A and ground.

Did the test lamp light?

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Go to Step 3

Go to Step 4

Locate and repair the short to ground in CKT 121 (WHT) between the generator and the instrument cluster. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

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Go to Instrument Cluster System Check

Go to Step 4

Connect a J 35616-200 test lamp between instrument cluster connector cavity 6 and generator connector cavity A.

Did the test lamp light?

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Go to Step 5

Go to Step 6

1. Connect the connector at the generator.
2. Start the engine.
3. Connect a voltmeter or oscilloscope between instrument cluster connector cavity 6 and ground.
4. Look for potentially pulsating voltage at or below 14 volts.

Is there voltage present?

14 V

Go to Step 7

Go to Step 8

Locate and repair the open in CKT 121 (WHT) between the generator and the instrument cluster. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

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Go to Instrument Cluster System Check

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Replace the instrument cluster. Refer to Instrument Cluster Replacement .

Is the repair complete?

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Go to Instrument Cluster System Check

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Replace the generator. Refer to Generator Replacement or Auxiliary Generator Replacement in Engine Electrical.

Is the repair complete?

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Go to Instrument Cluster System Check

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