Schematic Reference: Starting and Charging Schematics

Connector End View Reference: Power and Grounding Connector End Views

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

Apply the brake and press the Start button.

Does the engine crank?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

1. Install a scan tool.
2. Turn ON the ignition, with the engine OFF.

Are DTCs  B2515,C0277, C0278, P0615, P0616, P0617 or P1825 current?

Go to Diagnostic Trouble Code (DTC) List - 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 starter relay command parameter in the engine control module (ECM) data list.
4. Apply the brake and press the Start button.

Does the scan tool display ON?

Go to Step 6

Go to Step 5

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 PNP switch parameter in the engine control module (ECM) data list.

Does the scan tool display Park/Neutral?

Go to Step 14

Go to Diagnostic Trouble Code (DTC) List - Vehicle

Apply the brake and press the Start button.

Do you hear the Starter relay click?

Go to Step 9

Go to Step 7

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

Does the test lamp illuminate?

Go to Step 8

Go to Step 19

1. Connect a test lamp between the battery positive voltage circuit of the Starter relay coil and the control circuit of the Starter relay.
2. Apply the brake and press the Start button.

Does the test lamp illuminate?

Go to Step 15

Go to Step 13

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

Does the test lamp illuminate?

Go to Step 10

Go to Step 20

Important: Ensure the parking brake is applied and the transmission is in park equipped with an automatic transmission or neutral on a manual transmission.

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

Does the engine crank?

Go to Step 15

Go to Step 11

Does the fuse in the jumper open?

Go to Step 21

Go to Step 12

Test the supply 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 26

Go to Step 16

Test the control circuit of the Starter 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 26

Go to Step 18

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

Did you find and correct the condition?

Go to Step 26

Go to Step 17

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

Did you find and correct the condition?

Go to Step 26

Go to Step 22

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 26

Go to Step 23

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 26

Go to Step 24

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

Did you find and correct the condition?

Go to Step 26

Go to Step 25

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

Did you complete the repair?

Go to Step 26

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

Did you complete the repair?

Go to Step 26

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

Did you complete the repair?

Go to Step 26

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Replace the Starter relay.

Did you complete the replacement?

Go to Step 26

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Replace the Starter Motor. Refer to Starter Motor Replacement .

Did you complete the replacement?

Go to Step 26

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

Did you complete the replacement?

Go to Step 26

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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 26

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2