Schematic Reference: Starting and Charging Schematics

Connector End View Reference: Master Electrical Component List in Wiring Systems

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 starter solenoid click?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

1. Install a scan tool.
2. With a scan tool, observe the Starter Relay Command parameter in the ECM/PCM data list.
3. Turn the ignition switch to the Crank position.

Does the scan tool display On?

Go to Step 4

Go to Step 5

Turn the ignition back and forth from the ON to Crank position a few times.

Does the Starter Relay click each time the ignition is turned to the Crank position?

Go to Step 15

Go to Step 9

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

Does the scan tool display Yes?

Go to Step 6

Go to Step 8

1. Turn ON the ignition, with the engine OFF.
2. With a scan tool, observe the Start Disabled parameter in the VTD data list.

Does the scan tool display Yes?

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

Go to Step 7

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 IMS Range parameter in the Transmission data list.

Does the scan tool display Park or Neutral?

Go to Step 24

Go to Diagnostic System Check - Automatic Transmission in Automatic Transaxle - 5L40-E

1. Turn OFF the ignition.
2. Disconnect the ECM.
3. Connect a test lamp between the Start Command circuit of the EMC and a good ground.
4. Turn the ignition to the Start position.

Does the test lamp illuminate?

Go to Step 24

Go to Step 17

1. Turn OFF the ignition.
2. Disconnect the IGN 1 Relay.
3. Connect a test lamp between the battery positive voltage circuit of the Run/Crank Relay coil circuit and a good ground.
4. Turn On the ignition, with the engine OFF.

Does the test lamp illuminate?

Go to Step 10

Go to Step 25

1. Turn OFF the ignition.
2. Connect a test lamp between the ignition 1 voltage circuit of the IGN 1 Relay coil and the ground circuit of the IGN 1 Relay coil.
3. Turn On the ignition, with the engine OFF.

Does the test lamp illuminate?

Go to Step 11

Go to Step 26

1. Connect a 10 amp fused jumper between the battery positive voltage circuit of the IGN 1 Relay switch and the Starter Relay Ignition 1 circuit of the IGN 1 Relay switch.
2. Turn the ignition switch to the START position.

Does the starter solenoid click?

Go to Step 20

Go to Step 12

Important: Leave the fused jumper in place.

1. Disconnect the Starter Relay.
2. Connect a test lamp between the ignition 1 voltage circuit of the Starter Relay coil and a good ground.

Does the test lamp illuminate?

Go to Step 13

Go to Step 27

1. Connect a test lamp between the ignition 1 voltage circuit of the Starter Relay coil and the control circuit of the Starter Relay coil.
2. Turn the ignition to the Start position.

Does the test lamp illuminate?

Go to Step 21

Go to Step 14

1. Turn OFF the ignition.
2. Disconnect the ECM.
3. Install the Starter Relay.
4. Connect a test lamp between the control circuit of the Starter Relay and a good ground.

Does the test lamp illuminate?

Go to Step 24

Go to Step 28

Important: The engine may crank when the fused jumper is put into place.

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 21

Go to Step 16

Does the fuse in the jumper open?

Go to Step 18

Go to Step 19

Test the Start Command circuit of the ECM for a high resistance or open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 34

Go to Step 23

Test the supply voltage circuit of the starter solenoid 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 34

Go to Step 22

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

Did you find and correct the condition?

Go to Step 34

Go to Step 22

Inspect for poor connection at the Run/Crank 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 34

Go to Step 29

Inspect for poor connection 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 34

Go to Step 30

Inspect for poor connection 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 34

Go to Step 31

Inspect for poor connection 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 34

Go to Step 32

Inspect for poor connection at the ECM. 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 34

Go to Step 33

Repair the high resistance or open in the ignition 1 voltage circuit of the IGN 1 Relay coil. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 34

--

Repair the high resistance or open in the ground circuit of the IGN 1 Relay coil. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 34

--

Repair the high resistance or open in the ignition 1 voltage circuit of the Starter relay coil. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 34

--

Repair the high resistance or open in the control circuit of the Starter relay. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 34

--

Replace the IGN 1 relay.

Did you complete the replacement?

Go to Step 34

--

Replace the Starter relay.

Did you complete the replacement?

Go to Step 34

--

Replace the starter. Refer to Starter Motor Replacement .

Did you complete the replacement?

Go to Step 34

--

Replace the ignition switch. Refer to Ignition and Start Switch Replacement in Steering Wheel and Column.

Did you complete the replacement?

Go to Step 34

--

Important: The replacement PCM must be programmed.

Replace the PCM. Refer to Engine Control Module Replacement in Engine Controls - 2.6L and 3.2L, Engine Control Module Replacement in Engine Controls - 3.6L (LY7), or Powertrain Control Module Replacement in Engine Controls - 5.7L.

Did you complete the replacement?

Go to Step 34

--

Operate the system for which the symptom occurred.

Did you correct the condition?

System OK

Go to Step 2