Schematic References: Starting and Charging Schematics

Did you perform the Diagnostic System Check for Engine Electrical?

Go to Step 2

Go to Diagnostic System Check - Engine Electrical

Turn the ignition 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. Turn ON the ignition, with the engine OFF.
3. With a scan tool, observe the Crank Request Signal parameter in the PCM data list.
4. Turn the ignition to the START position.

Does the scan tool display Yes?

Go to Step 5

Go to Step 4

1. Turn ON the ignition, with the engine OFF.
2. With a scan tool, observe the Crank Request Signal parameter in the PCM data list.
3. Turn the ignition to the START position.

Does the scan tool display Yes?

Go to Step 11

Go to Range Selector Displays Incorrect Range in Automatic Transaxle - 4T80- E

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 of the Starter relay coil circuit and a good ground.

Does the test lamp illuminate?

Go to Step 6

Go to Step 19

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

Does the test lamp illuminate?

Go to Step 7

Go to Step 12

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

Does the test lamp illuminate?

Go to Step 8

Go to Step 13

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

Does the engine crank?

Go to Step 14

Go to Step 9

Does the fuse in the jumper open?

Go to Step 21

Go to Step 10

1. Disconnect the engine harness connector C107.
2. Connect a test lamp between the starter solenoid crank voltage circuit and a good ground.

Does the test lamp illuminate?

Go to Step 15

Go to Step 22

1. Turn OFF the ignition.
2. Disconnect the PCM harness connector C1.
3. Connect a test lamp between the crank request input circuit of the PCM and a good ground.
4. Turn the ignition to the START position.

Does the test lamp illuminate?

Go to Step 18

Go to Step 13

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

Did you find and correct the condition?

Go to Step 27

Go to Step 18

Test the crank request circuit of the PCM for an open or a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 27

Go to Step 17

Inspect for poor connections at the Starter 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 27

Go to Step 23

Inspect for poor connections at the engine harness connector C107. 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 27

Go to Step 16

Inspect for poor connections at the starter solenoid. 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 27

Go to Step 24

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 27

Go to Step 25

Inspect for poor connection at the PCM harness connector C1. 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 27

Go to Step 26

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

Did you find and correct the condition?

Go to Step 27

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

Did you find and correct the condition?

Go to Step 27

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

Did you find and correct the condition?

Go to Step 27

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Repair an open or high resistance in the crank voltage circuit of the starter solenoid. Refer to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 27

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Replace the Starter relay.

Did you complete the replacement?

Go to Step 27

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Replace the Starter Motor. Refer to Starter Motor Replacement .

Did you complete the replacement?

Go to Step 27

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Replace the Ignition Switch. Refer to Ignition Switch Replacement - On Vehicle in Instrument Panel, Gages and Console.

Did you complete the replacement?

Go to Step 27

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Important: Perform the set up procedures for the PCM. Refer to Powertrain Control Module Programming in Engine Controls - 4.6L.

Replace the PCM. Refer to Powertrain Control Module Replacement in Engine Controls - 4.6L.

Did you complete the replacement?

Go to Step 27

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2