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

Turn the ignition switch to the START position.

Is the security indicator ON?

Go to Security Indicator Malfunction

Go to Step 3

Turn the ignition switch to the START position.

Does the starter solenoid click?

Go to Starter Solenoid Clicks, Engine Does Not Crank

Go to Step 4

1. With a scan tool, observe the Crank Request Signal parameter in the engine control module (ECM) data list.
2. Turn the ignition to the START position.

Does the scan tool display that the Crank Request Signal parameter is Yes?

Go to Step 5

Go to Power Mode Mismatch

1. With a scan tool, observe the Starter Relay Command parameter in the ECM data list.
2. Turn the ignition switch to the START position.

Does the scan tool display that the Starter Relay Command parameter is ON?

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 PNP parameter in the ECM data list.

Does the scan tool display Park or Neutral?

Go to Step 7

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1. Disconnect the starter relay.
2. Turn the ignition ON.
3. Connect a test light between the starter relay coil supply voltage circuit and a good ground.

Does the test light illuminate?

Go to Step 8

Go to Step 13

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

Does the test light illuminate?

Go to Step 9

Go to Step 12

1. Disconnect the starter relay.
2. Turn the ignition ON.
3. Connect a test light between the starter relay switch supply voltage circuit and good ground.

Does the test light illuminate?

Go to Step 10

Go to Step 14

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

Does the engine crank?

Go to Step 17

Go to Step 11

Does the fuse in the jumper open?

Go to Step 16

Go to Step 15

Test the STARTER relay coil control circuit of the ECM for an open or high resistance. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 23

Go to Step 18

Repair the battery positive voltage circuit of the relay coil. Refer to Wiring Repairs .

Did you complete the repair?

Go to Step 23

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Repair the starter relay switch supply voltage circuit. Refer to Wiring Repairs .

Did you complete the repair?

Go to Step 23

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

Did you find and correct the condition?

Go to Step 23

Go to Step 19

Test the starter solenoid crank voltage circuit of the starter relay for a short to ground. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 23

Go to Step 22

Inspect for poor conditions 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 23

Go to Step 20

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 23

Go to Step 21

Inspect for poor connections at the harness connector of 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 23

Go to Step 22

Replace the starter relay. Refer to Relay Replacement .

Did you complete the replacement?

Go to Step 23

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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 23

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Replace the starter. Refer to Starter Motor Replacement .

Did you complete the replacement?

Go to Step 23

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Operate the system for which the symptom occurred.

Did you correct the condition?

System OK

Go to Step 2