Schematic Reference: Starting and Charging Schematics

Connector End View Reference: Power and Grounding Connector End Views

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

Turn the ignition to the Start position.

Is the theft indicator flashing?

Go to Diagnostic Trouble Code (DTC) List - Vehicle

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

Does the vehicle have an automatic transmission?

Go to Step 5

Go to Step 8

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. or Transmission Range parameter in the transmission data of the engine control module (ECM)/powertrain control module (PCM) data list.

Does the scan tool display Park or Neutral?

Go to Step 6

Go to Range Selector Displays Incorrect Range

1. Disconnect the transmission range switch.
2. Connect a test lamp between the crank voltage circuit of the transmission range switch harness connector and ground.
3. Turn the ignition to the Start position.

Does the test lamp illuminate?

Go to Step 7

Go to Step 10

Important: You must use 10 AWG wire for the fused jumper. Any smaller wire will cause too high of a resistance and a misdiagnosis will occur.

1. Connect a 15-amp fused jumper wire between the crank voltage circuit of the transmission range switch and the starter solenoid crank voltage circuit of the transmission range switch.
2. Turn the ignition to the Start position.

Does the engine crank?

Go to Step 13

Go to Step 11

Important: Place the transmission in neutral and set the parking brake.

1. Disconnect the clutch pedal position (CCP) switch.
2. Connect a test lamp between the crank voltage circuit of the CCP switch harness connector and ground.
3. Turn the ignition to the Start position.

Does the test lamp illuminate?

Go to Step 9

Go to Step 10

Important: You must use 10 AWG wire for the fused jumper. Any smaller wire will cause too high of a resistance and a misdiagnosis will occur.

1. Connect a 15-amp fused jumper wire between the crank voltage circuit of the CCP switch and the starter solenoid crank voltage circuit of the CCP switch.
2. Turn the ignition to the Start position.

Does the engine crank?

Go to Step 14

Go to Step 11

Test the crank voltage circuit of the transmission range switch or CCP switch for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 20

Go to Step 12

Test the starter solenoid crank voltage circuit for the following:

Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 20

Go to Step 15

Inspect for poor connections at the ignition switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 20

Go to Step 16

Inspect for poor connections at the transmission range switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 20

Go to Step 17

Inspect for poor connections at the CCP switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 20

Go to Step 18

Inspect for poor connections at the starter solenoid. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 20

Go to Step 19

Replace the ignition switch. Refer to Ignition and Start Switch Replacement .

Did you complete the replacement?

Go to Step 20

--

Replace the transmission range switch. Refer to Park/Neutral Position Switch Replacement .

Did you complete the replacement?

Go to Step 20

--

Replace the CCP switch. Refer to Clutch Pedal Position Switch Replacement .

Did you complete the replacement?

Go to Step 20

--

Replace the starter motor. Refer to Starter Motor Replacement .

Did you complete the replacement?

Go to Step 20

--

Operate the system for which the symptom occurred.

Is the symptom still present?

Go to Step 2

System OK

Schematic Reference: Starting and Charging Schematics

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

Turn the ignition switch to the START position.

Does the engine crank?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

Turn the ignition switch to the START position.

Does the starter motor relay click?

Go to Step 6

Go to Step 4

1. Remove the starter motor relay.
2. Connect a test light from the supply voltage circuit of the starter motor relay coil circuit to ground.
3. With the transmission in PARK, turn the ignition switch to the START position.

Does the test light illuminate?

Go to Step 5

Go to Step 10

1. Connect a test light from the supply voltage circuit of the starter motor relay coil circuit to the control circuit of the starter motor relay coil circuit.
2. With the transmission in PARK turn the ignition switch to the START position.

Does the test light illuminate?

Go to Step 6

Go to Step 9

1. Turn OFF the ignition.
2. Remove the starter motor relay.
3. Connect a test lamp between the battery positive voltage circuit of the starter motor relay switch circuit and a good ground.
4. With the transmission in PARK, turn the ignition switch to the START position.

Does the test lamp illuminate?

Go to Step 7

Go to Step 16

Important: : Verify that the transmission is in Park (automatic) or Neutral (manual) with the parking brake set.

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

Does the engine crank?

Go to Step 12

Go to Step 8

Does the fuse in the jumper open?

Go to Step 17

Go to Step 11

Test the control circuit of the starter motor relay for an open or high resistance. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 22

Go to Step 13

Test the supply voltage circuit of the starter motor relay coil circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 22

Go to Step 14

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

Did you find and correct the condition?

Go to Step 22

Go to Step 15

Inspect for poor connections at the starter motor relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 22

Go to Step 18

Inspect for a poor connection at the PNP switch harness connector. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 22

Go to Step 19

Inspect for poor connections at the ignition switch harness connector. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 22

Go to Step 20

Inspect for poor connections at the starter solenoid. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 22

Go to Step 21

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

Did you complete the repair?

Go to Step 22

--

Repair the short to ground in the supply voltage circuit of the starter solenoid. Refer to Wiring Repairs .

Did you complete the repair?

Go to Step 22

--

Replace the starter relay. Refer to Relay Replacement .

Did you complete the replacement?

Go to Step 22

--

Replace the PNP switch. Refer to Park/Neutral Position Switch Replacement .

Did you complete the replacement?

Go to Step 22

--

Replace the ignition switch. Refer to Ignition and Start Switch Replacement .

Did you complete the replacement?

Go to Step 22

--

Replace the starter. Refer to Starter Motor Replacement .

Did you complete the replacement?

Go to Step 22

--

Operate the system for which the symptom occurred.

Did you correct the condition?

System OK

Go to Step 2

Schematic Reference: Starting and Charging Schematics

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

Turn the ignition switch to the start position.

Does the engine crank?

Go to Testing for Intermittent Conditions and Poor Connections

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 engine control module (ECM) 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

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 PNP switch parameter in the engine control module (ECM) data list.

Does the scan tool display Park/Neutral?

Go to Step 13

Go to Shift Indicator Indicates Wrong Gear Selection

Turn the ignition switch to the start position.

Did the starter relay click?

Go to Step 8

Go to Step 6

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

Does the test lamp illuminate?

Go to Step 9

Go to Step 19

Important: The engine may crank in this next step.

Connect a 30-amp fused jumper between the battery positive voltage circuit of the starter 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

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

Did you find and correct the condition?

Go to Step 25

Go to Step 15

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

Did you find and correct the condition?

Go to Step 25

Go to Step 17

Test the crank request signal circuit of the engine control module (ECM) for a high resistance or open. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 25

Go to Step 16

Inspect for poor connections at the starter relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 25

Go to Step 21

Inspect for poor connections at the starter solenoid. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 25

Go to Step 22

Inspect for poor connections at the ignition switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 25

Go to Step 23

Inspect for poor connections at the harness connector of the ECM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 25

Go to Step 24

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

Did you complete the repair?

Go to Step 25

--

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

Did you complete the repair?

Go to Step 25

--

Repair the short to ground in the supply voltage circuit of the starter solenoid. Refer to Wiring Repairs .

Did you complete the repair?

Go to Step 25

--

Replace the starter relay.

Did you complete the replacement?

Go to Step 25

--

Replace the starter motor. Refer to Starter Motor Replacement .

Did you complete the replacement?

Go to Step 25

--

Replace the ignition switch. Refer to Ignition and Start Switch Replacement .

Did you complete the replacement?

Go to Step 25

--

Replace the ECM. Refer to Control Module References for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 25

--

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2