Schematic Reference: Starting and Charging Schematics

Did you perform the Diagnostic System Check - Starting and Charging?

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

Does the scan tool display Yes?

Go to Step 5

Go to Step 4

With a scan tool, observe the VTD Fuel Disable states in the PCM data list.

Does the scan tool display Active?

Go to Diagnostic System Check - Theft Deterrent in Theft Deterrent System

Go to Step 13

Turn the ignition switch to the START position.

Do you hear the START relay click?

Go to Step 8

Go to Step 6

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

Does the test lamp illuminate?

Go to Step 7

Go to Step 18

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

Does the test lamp illuminate?

Go to Step 14

Go to Step 12

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

Does the test lamp illuminate?

Go to Step 9

Go to Step 19

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

Does the engine crank?

Go to Step 14

Go to Step 10

Does the fuse in the jumper open?

Go to Step 20

Go to Step 11

1. Disconnect the supply voltage circuit of the starter solenoid.
2. Connect a test lamp between supply voltage circuit of the starter solenoid and a good ground.

Does the test lamp illuminate?

Go to Step 15

Go to Step 21

Test the control circuit of the START 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 26

Go to Step 17

Test the crank request input 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 26

Go to Step 16

Inspect for poor connections at the START 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 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 in Wiring Systems.

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 in Wiring Systems.

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 PCM. 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 26

Go to Step 25

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

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 START relay switch. Refer to Wiring Repairs in Wiring Systems.

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 in Wiring Systems.

Did you complete the repair?

Go to Step 26

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

Did you complete the repair?

Go to Step 26

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Replace the START 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 Key Alarm Switch Assembly - Disassemble - Off Vehicle and Ignition and Key Alarm Switch Assembly - Assemble - Off Vehicle in Steering Column - Tilt.

Did you complete the replacement?

Go to Step 26

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Important:: Perform the set up procedures for the PCM/VCM.

Replace the PCM/VCM. Refer to Powertrain Control Module Replacement/Programming in Engine Controls - 3.8L.

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

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