Schematic Reference: Starting and Charging Schematics

Did you perform the Engine Electrical Diagnostic System Check?

Go to Step 2

Go to Starting System Check

Turn the ignition to the ON position.

Is the Theft indicator flashing?

Go to Diagnostic System Check - Theft Deterrent in Theft Deterrent

Go to Step 3

Turn the ignition to the START position.

Does the starter solenoid click?

Go to Starter Solenoid Clicks, Engine Does Not Crank

Go to Step 4

Did the engine crank?

Go to Intermittents and Poor Connections Diagnosis in Wiring Systems

Go to Step 5

1. Install a scan tool.
2. Turn ON the ignition, with the engine OFF.
3. Place the transmission in Park or Neutral.
4. 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 6

Go to Park/Neutral Position Switch Adjustment in Automatic Transaxle - 4T65-E

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

Does the scan tool display Enabled?

Go to Step 7

Go to Step 14

Turn the ignition to the START position.

Does the STARTER relay click?

Go to Step 11

Go to Step 8

1. Turn OFF the ignition.
2. Remove the CRANK relay.
3. Connect a test lamp between the battery positive voltage circuit of the CRANK relay coil and a good ground.
4. Turn the ignition to the ON position.

Does the test lamp illuminate?

Go to Step 9

Go to Step 10

1. Connect a test lamp between the battery positive voltage circuit of the CRANK relay coil and the CRANK relay 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 15

1. Turn OFF the ignition.
2. Disconnect the Park Neutral Position (PNP) switch.
3. Turn ON the ignition, with the Engine OFF.
4. Connect a 10-amp fused jumper between the STARTER relay coil control circuits of the PNP switch.
5. Turn the ignition to the START position.

Does the test lamp illuminate?

Go to Step 17

Go to Step 24

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 12

Go to Step 22

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

Does the engine crank?

Go to Step 18

Go to Step 13

Does the fuse in the jumper open?

Go to Step 23

Go to Step 16

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

Did you find and correct the condition?

Go to Step 30

Go to Step 19

Test the CRANK relay control circuit of the PCM for an open or high resistance. Refer to Testing for Continuity and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 30

Go to Step 20

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

Did you find and correct the condition?

Go to Step 30

Go to Step 21

Inspect for poor connections at the PNP switch. Refer to Intermittents and Poor Connections Diagnosis and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 30

Go to Step 25

Inspect for poor connections at the CRANK relay. Refer to Intermittents and Poor Connections Diagnosis and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 30

Go to Step 26

Inspect for poor connections at the ignition switch harness connector. Refer to Intermittents and Poor Connections Diagnosis and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 30

Go to Step 27

Inspect for poor connections at the PCM harness connector. Refer to Intermittents and Poor Connections Diagnosis and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 30

Go to Step 28

Inspect for poor connections at the starter solenoid. Refer to Intermittents and Poor Connections Diagnosis and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 30

Go to Step 29

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

Did you complete the repair?

Go to Step 30

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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 30

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

Did you find and correct the condition?

Go to Step 30

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Replace the PNP switch. Refer to Park/Neutral Position Switch Replacement in Automatic Transmission - 4T65-E.

Did you complete the replacement?

Go to Step 30

--

Replace the CRANK relay.

Did you complete the replacement?

Go to Step 30

--

Replace the Ignition Switch. Refer to Ignition and Start Switch Replacement in Instrument Panel, Gauges, and Console.

Did you complete the replacement?

Go to Step 30

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IMPORTANT:: Perform the set up procedures for the PCM. Refer to Powertrain Control Module Replacement/Programming in Engine Controls - 3.8L.

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

Did you complete the replacement?

Go to Step 30

--

Replace the Starter Motor. Refer to Starter Motor Replacement .

Did you complete the replacement?

Go to Step 30

--

Operate the system for which the symptom occurred.

Did you correct the condition?

System OK

Go to Step 2