Schematic References: Starting and Charging Schematics

Connector End View Reference: Master Electrical Component List

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

Turn the ignition switch to the START position.

Does the engine crank?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

1. Turn ON the ignition, with the engine OFF.
2. With a scan tool, observe the Crank Request Signal parameter in the ECM data list.
3. Turn the ignition to the START position.

Does the scan tool display Yes?

Go to Step 5

Go to Step 4

1. Turn ON the ignition, with the engine OFF.
2. Verify that the transmission is in Park or Neutral.
3. With a scan tool, observe the TR Sw. parameter in the transmission control module (TCM) data list.

Does the scan tool display Park or Neutral?

Go to Step 14

Go To Power Mode Mismatch

1. Disconnect the Crank relay.
2. Turn ON the ignition, with the engine OFF.
3. Connect a test lamp between the battery positive voltage circuit of the Crank relay coil and a good ground.

Does the test lamp illuminate?

Go to Step 6

Go to Step 15

1. Connect a test lamp between the battery positive voltage circuit of the Crank relay coil and the control circuit of the Crank relay.
2. Turn the ignition to the START position.

Does the test lamp illuminate?

Go to Step 7

Go to Step 11

1. Turn OFF the ignition.
2. Connect a test lamp between the battery positive voltage circuit of the Crank relay switch and a good ground.

Does the test lamp illuminate?

Go to Step 8

Go to Step 16

Important:  The engine may crank during the following step.

1. Turn OFF the ignition.
2. Connect a 30-amp fused jumper between the battery positive voltage circuit of the Crank relay switch and the starter solenoid crank voltage circuit of the Crank relay.

Does the engine crank?

Go to Step 12

Go to Step 9

Does the fuse in the jumper open?

Go to Step 17

Go to Step 10

Test the starter solenoid crank voltage circuit of the starter solenoid for a high resistance or open. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 21

Go to Step 13

Test the control circuit of the Crank relay for an open or short to battery voltage. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 21

Go to Step 14

Inspect for poor connections at the Crank relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 21

Go to Step 18

Inspect for poor connections at the starter solenoid. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 21

Go to Step 19

Inspect for poor connections at the harness connector of the engine control module (ECM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 21

Go to Step 20

Repair the open or high resistance in the battery positive voltage of the Crank relay coil circuit. Refer to Wiring Repairs .

Did you complete the repair?

Go to Step 21

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Repair the open or high resistance in the battery positive voltage circuit of the Crank relay switch. Refer to Wiring Repairs .

Did you complete the repair?

Go to Step 21

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Repair the short to ground in the crank voltage circuit of the starter solenoid. Refer to Wiring Repairs .

Did you complete the repair?

Go to Step 21

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Replace the Crank relay. Refer to Relay Replacement .

Did you complete the replacement?

Go to Step 21

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Replace the starter motor. Refer to Starter Motor Replacement .

Did you complete the replacement?

Go to Step 21

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Replace the ECM. Refer to Control Module References for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 21

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2