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 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

Power Mode Mismatch

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

Does the scan tool display 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 TR Sw.parameter in the Transmission 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 PCM CNTRL relay click?

Go to Step 10

Go to Step 8

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

Does the test lamp illuminate?

Go to Step 9

Go to Step 18

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

Does the test lamp illuminate?

Go to Step 15

Go to Step 14

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

Does the test lamp illuminate?

Go to Step 11

Go to Step 19

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 PCM CNTRL relay switch and the starter solenoid crank voltage circuit.

Does the engine crank?

Go to Step 15

Go to Step 12

Does the fuse in the jumper open?

Go to Step 20

Go to Step 13

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 24

Go to Step 16

Test the control circuit of the PCM CNTRL 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 24

Go to Step 17

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

Did you find and correct the condition?

Go to Step 24

Go to Step 21

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 24

Go to Step 22

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

Did you find and correct the condition?

Go to Step 24

Go to Step 23

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

Did you complete the repair?

Go to Step 24

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

Did you complete the repair?

Go to Step 24

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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 24

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Replace the PCM CNTRL relay.

Did you complete the replacement?

Go to Step 24

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Replace the starter motor. Refer to Starter Motor Replacement .

Did you complete the replacement?

Go to Step 24

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

Did you complete the replacement?

Go to Step 24

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2