For 1990-2009 cars

Step | Action | Yes | No
--- | --- | --- | ---
Schematic Reference: Starting and Charging Schematics
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle
2 | 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
3 | Is the security indicator flashing? | Go to Diagnostic System Check - Vehicle | Go to Step 4
4 |

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

Does the scan tool display Yes?

Go to Step 5

Go to Step 13

5 |

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

Does the scan tool display Yes?

Go to Step 6

Go to Step 13

6 |

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 Current Gear parameter in the PCM data list.

Does the scan tool display Park or Neutral?

Go to Step 7

Go to Range Selector Displays Incorrect Range

7 | Turn the ignition switch to the START position. Do you hear the STARTER relay click? | Go to Step 10 | Go to Step 8
8 |

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 9

Go to Step 21

9 |

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 to the START position.

Does the test lamp illuminate?

Go to Step 17

Go to Step 15

10 |

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 and a good ground.

Does the test lamp illuminate?

Go to Step 11

Go to Step 22

11 | Connect a 30-amp fused jumper between the battery positive voltage circuit of the STARTER relay switch and the starter solenoid crank voltage circuit. Does the engine crank? | Go to Step 17 | Go to Step 12
12 | Does the fuse in the jumper open? | Go to Step 23 | Go to Step 14
13 |

1. Turn OFF the ignition.
2. Disconnect the PCM harness connector.
3. Connect a test lamp between the crank voltage circuit of the PCM and a good ground.
4. Turn the ignition to the START position.

Does the test lamp illuminate?

Go to Step 20

Go to Step 16

14 | Test the starter solenoid crank voltage circuit for a high resistance or open. Refer to Circuit Testing and Wiring Repairs. Did you find and correct the condition? | Go to Step 28 | Go to Step 18
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 28 | Go to Step 20
16 | Test the crank voltage circuit of the PCM for a high resistance or open. Refer to Circuit Testing and Wiring Repairs. Did you find and correct the condition? | Go to Step 28 | Go to Step 19
17 | 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 28 | Go to Step 24
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 28 | Go to Step 25
19 | 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 28 | Go to Step 26
20 | Inspect for poor connections at the harness connector of the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs. Did you find and correct the condition? | Go to Step 28 | Go to Step 27
21 | 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 28 | --
22 | 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 28 | --
23 | Repair the short to ground in the starter solenoid crank voltage circuit. Refer to Wiring Repairs . Did you complete the repair? | Go to Step 28 | --
24 | Replace the STARTER relay. Refer to Relay Replacement. Did you complete the replacement? | Go to Step 28 | --
25 | Replace the starter motor. Refer to Starter Motor Replacement . Did you complete the replacement? | Go to Step 28 | --
26 | Replace the ignition switch. Refer to Ignition and Start Switch Replacement. Did you complete the replacement? | Go to Step 28 | --
27 | Replace the PCM. Refer to Control Module References for replacement, setup, and programming. Did you compete the replacement? | Go to Step 28 | --
28 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2