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

Does the scan tool display Enabled?

Go to Step 4

Go to Step 12

Turn the ignition switch to the START position.

Do you hear the CRANK relay click?

Go to Step 7

Go to Step 5

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

Does the test lamp illuminate?

Go to Step 6

Go to Step 18

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

Does the test lamp illuminate?

Go to Step 13

Go to Step 11

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 8

Go to Step 19

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 13

Go to Step 9

Did the fuse in the jumper open?

Go to Step 20

Go to Step 10

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

Does the test lamp illuminate?

Go to Step 14

Go to Step 21

Test the control circuit of the CRANK relay for an open or a 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 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 26

Go to Step 22

Inspect for poor connections at the engine harness connector C112. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Did you find and correct the condition?

Go to Step 26

Go to Step 15

Inspect for poor connections at the starter solenoid. Refer to Testing for Intermittent Conditions and Poor Connections 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 PCM harness connectors. 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 CRANK relay coil. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 26

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

Is the repair complete?

Go to Step 26

--

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

Is the repair complete?

Go to Step 26

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

Is the repair complete?

Go to Step 26

--

Replace the CRANK relay.

Is the repair complete?

Go to Step 26

--

Replace the starter motor. Refer to Starter Motor Replacement .

Did you complete the replacement?

Go to Step 26

--

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

Is the repair complete?

Go to Step 26

--

Replace the PCM. Refer to Powertrain Control Module Replacement/Programming in Engine Controls - 3.4L or 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 find and correct the condition?

System OK

Go to Step 2