Schematic Reference: Starting and Charging Schematics

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

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

Turn the ignition switch to the START position.

Does the starter relay click?

Go to Step 9

Go to Step 4

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

Does the scan tool display that the Crank Request Signal parameter is Yes?

Go to Step 5

Go to Step 12

1. Disconnect the starter relay.
2. Connect a test light between the starter relay coil supply voltage circuit and the starter relay coil control circuit of the starter relay.
3. Turn the ignition switch to the START position.

Does the test light illuminate?

Go to Step 20

Go to Step 6

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

Does the test light illuminate?

Go to Step 7

Go to Step 16

1. Disconnect the Park Neutral Position (PNP) switch.
2. Turn ON the ignition, with the engine OFF.
3. Connect a test light between the ignition 1 voltage circuit and a good ground.

Does the test light illuminate?

Go to Step 8

Go to Step 14

1. Turn OFF the ignition.
2. Connect a 10-amp fused jumper between the starter relay coil supply voltage circuit and the ignition 1 voltage circuit of the PNP switch.
3. Turn the ignition switch to the START position.

Does the starter motor crank?

Go to Step 21

Go to Step 15

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

Does the test lamp illuminate?

Go to Step 10

Go to Step 17

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

Does the engine crank?

Go to Step 20

Go to Step 11

Does the fuse in the jumper open?

Go to Step 19

Go to Step 18

1. Turn the ignition ON, with the engine OFF.
2. With a scan tool, observe IGN Switch Run/Crank Signal parameter in the Vehicle Control System (VCS) data list.
3. Turn the ignition switch to the START position.

Does the IGN Switch Run/Crank Signal parameter display ON?

Go to Step 13

Go to Power Mode Mismatch in Computer/Integrating Systems

1. Turn the ignition ON, with the engine OFF.
2. With a scan tool, observe Run Crank Relay Command parameter in the VCS data list.
3. Turn the ignition switch to the START position.

Does the Run Crank Relay Command parameter display ON?

Go to Step 14

Go to Step 24

Repair the ignition 1 voltage circuit of the PNP switch. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 30

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Repair the starter relay coil supply voltage circuit of the PNP switch. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 30

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Test the starter relay coil control circuit of the starter relay 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 30

Go to Step 22

Repair the battery positive voltage switch circuit of the starter relay. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 30

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Test the starter solenoid crank voltage circuit of the starter relay 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 30

Go to Step 23

Test the starter solenoid crank voltage circuit of the starter relay 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 30

Go to Step 23

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 30

Go to Step 25

Inspect for poor connections at the harness connector of the PNP. 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 30

Go to Step 26

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 30

Go to Step 27

Inspect for poor connections at the harness connector of 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 30

Go to Step 28

Inspect for poor connections at the harness connector of the body control module (BCM). 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 30

Go to Step 29

Replace the starter relay. Refer to Relay Replacement in Wiring Systems.

Did you complete the replacement?

Go to Step 30

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Replace the PNP switch. Refer to Park/Neutral Position Switch Replacement in Automatic Transaxle - 4T40-E/4T45-E.

Did you complete the replacement?

Go to Step 30

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Important: The replacement PCM must be programmed.

Replace the PCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 30

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Replace the starter. Refer to Starter Motor Replacement .

Did you complete the replacement?

Go to Step 30

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Important: The replacement BCM must be programmed.

Replace the BCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 30

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Operate the system for which the symptom occurred.

Did you correct the condition?

System OK

Go to Step 2