Schematic Reference: Starting and Charging Schematics

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

Is the security indicator flashing?

Go to Diagnostic System Check - Vehicle

Go to Step 4

1. Install a scan tool.
2. Turn ON the ignition, with the engine OFF.
3. With a scan tool, observe the Crank Request Signal parameter in the engine control module (ECM)/powertrain control module (PCM) data list.
4. Turn the ignition switch to the START position.

Does the scan tool display Yes?

Go to Step 5

Go to Step 13

1. Turn ON the ignition, with the engine OFF.
2. With a scan tool, observe the Starter Relay Command parameter in the ECM/PCM data list.
3. Turn the ignition switch to the START position.

Does the scan tool display Yes?

Go to Step 7

Go to Step 6

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 7

Go to Range Selector Displays Incorrect Range

Turn the ignition switch to the START position.

Do you hear the STRTR relay click?

Go to Step 10

Go to Step 8

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

Does the test lamp illuminate?

Go to Step 9

Go to Step 21

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

Does the test lamp illuminate?

Go to Step 17

Go to Step 15

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

Does the test lamp illuminate?

Go to Step 11

Go to Step 22

Connect a 30-amp fused jumper between the battery positive voltage circuit of the STRTR relay switch and the starter solenoid crank voltage circuit.

Does the engine crank?

Go to Step 17

Go to Step 12

Does the fuse in the jumper open?

Go to Step 23

Go to Step 14

1. Turn OFF the ignition.
2. Disconnect the ECM/PCM harness connector.
3. Connect a test lamp between the crank voltage circuit of the ECM/PCM and a good ground.
4. Turn the ignition to the START position.

Does the test lamp illuminate?

Go to Step 20

Go to Step 16

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

Did you find and correct the condition?

Go to Step 28

Go to Step 18

Test the control circuit of the STRTR 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 28

Go to Step 20

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

Did you find and correct the condition?

Go to Step 28

Go to Step 19

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

Did you find and correct the condition?

Go to Step 28

Go to Step 24

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 28

Go to Step 25

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

Did you find and correct the condition?

Go to Step 28

Go to Step 26

Inspect for poor connections at the harness connector of the ECM/PCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs.

Did you find and correct the condition?

Go to Step 28

Go to Step 27

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

Did you complete the repair?

Go to Step 28

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

Did you complete the repair?

Go to Step 28

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

Did you complete the repair?

Go to Step 28

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Replace the STRTR relay. Refer to Relay Replacement.

Did you complete the replacement?

Go to Step 28

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Replace the starter motor. Refer to Starter Motor Replacement .

Did you complete the replacement?

Go to Step 28

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Replace the ignition switch. Refer to Ignition and Start Switch Replacement.

Did you complete the replacement?

Go to Step 28

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

Did you complete the replacement?

Go to Step 28

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2