Schematic Reference: Starting and Charging Schematics

Connector End View Reference: Master Electrical Component List in Wiring Systems

Did you perform the Diagnostic System Check for Engine Electrical?

Go to Step 2

Go to Diagnostic System Check - Engine Electrical

Turn the ignition switch to the START position.

Does the engine crank?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

1. Install a scan tool.
2. With a scan tool, observe the Security Lamp State parameter in the BCM Security Data list.
3. Turn the ignition switch to the START position.

Does the scan tool display On?

Go to Diagnostic System Check - Theft Deterrent in Theft Deterrent

Go to Step 4

1. With a scan tool, observe the Crank Request Signal parameter in the PCM data list.
2. Turn the ignition switch to the START position.

Does the scan tool display Yes?

Go to Step 5

Go to Step 13

1. With a scan tool, observe the Starter Relay Command parameter in the PCM data list.
2. 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 IMS parameter in the Transmission data list.

Does the scan tool display Park or Neutral?

Go to Step 7

Go to Transmission Internal Mode Switch Logic in Automatic Transaxle - 4T65E

Turn the ignition switch to the START position.

Do you hear the CRANK relay click?

Go to Step 10

Go to Step 8

1. Turn OFF the ignition.
2. Disconnect the CRANK relay.
3. Turn ON the ignition, with the engine OFF.
4. 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 9

Go to Step 22

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 18

Go to Step 16

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

Does the test lamp illuminate?

Go to Step 11

Go to Step 23

Connect a 40 amp fused jumper between the battery positive voltage circuit of the CRANK relay switch circuit and the supply voltage circuit of the CRANK solenoid.

Does the engine crank?

Go to Step 18

Go to Step 12

Did the fuse in the jumper open?

Go to Step 14

Go to Step 15

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

Does the test lamp illuminate?

Go to Step 21

Go to Step 17

Test the supply voltage circuit of the starter solenoid for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 28

Go to Step 19

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

Did you find and correct the condition?

Go to Step 28

Go to Step 19

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

Did you find and correct the condition?

Go to Step 28

Go to Step 21

Test the crank voltage circuit of the PCM for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 28

Go to Step 20

Inspect for poor connections at the CRANK relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

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 in Wiring Systems.

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 in Wiring Systems.

Did you find and correct the condition?

Go to Step 28

Go to Step 26

Inspect for poor connections at the PCM harness connectors. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

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 Starter relay coil. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 28

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

Is the repair complete?

Go to Step 28

--

Replace the CRANK relay.

Is the repair complete?

Go to Step 28

--

Replace the starter motor. Refer to Starter Motor Replacement.

Did you complete the replacement?

Go to Step 28

--

Replace the ignition switch. Refer to Ignition and Start Switch Replacement in Instrument Panel, Gages and Console.

Is the repair complete?

Go to Step 28

--

IMPORTANT:: Perform the set up procedures for the PCM.

Replace the PCM. Refer to Powertrain Control Module Replacement in Engine Controls - 3.4L or Powertrain Control Module Replacement in Engine Controls - 3.8L.

Did you complete the replacement?

Go to Step 28

--

Operate the system in order to verify the repair.

Did you find and correct the condition?

System OK

Go to Step 2