Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

The engine control module (ECM) (L61) or the powertrain control module (PCM) (LSJ) controls engine cranking based on a power mode input and the status of the clutch start switch (M86/MU3) or the park/neutral position (PNP) switch (MN5). With the transmission in Park/Neutral or the clutch pressed, voltage at the ECM/PCM PNP/clutch start switch signal circuit is high. This indicates to the ECM/PCM that conditions are acceptable for cranking. When a power mode crank request is seen, the ECM/PCM grounds the starter relay coil control circuit. This energizes the coil side of the relay, which pulls the switch side of the relay closed, applying voltage to the starter S-terminal and engaging the starter solenoid.

A misadjusted PNP switch or clutch start switch may result in a starter solenoid does not click condition. The adjustment process can be found in the replacement procedure for the component.

Schematic Reference

Starting and Charging Schematics

Connector End View Reference

Engine Electrical Connector End Views

Description and Operation

Starting System Description and Operation

Electrical Information Reference

Scan Tool Reference

Automatic Transmission (MN5)

1. Ignition ON. Verify that no starter relay, theft deterrent, engine, or transmission DTCs are set that would cause the ECM to disable starting.

⇒	If DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .

2. Observe the Crank Request parameter with a scan tool, in Engine Electrical, Data Display, Engine Control Module. Turn the ignition switch to the START position. Verify that the scan tool Crank Request parameter is Yes.

⇒	If the scan tool Crank Request parameter is [No], refer to Power Mode Mismatch .

3. Ignition ON, transmission in PARK. Observe the Starter Relay Command parameter with a scan tool, in Engine Electrical, Data Display, Engine Control Module. Turn the ignition switch to the START position.

⇒	If the solenoid engages but the engine does not crank, refer to Starter Solenoid Clicks, Engine Does Not Crank .

⇒	If the scan tool Starter Relay Command parameter is On, but the solenoid does not engage, refer to Circuit/System Testing: Crank Relay Circuit Malfunction.

⇒	If the scan tool Starter Relay Command parameter is Off, refer to Circuit/System Testing: PNP Switch Circuit Malfunction.

Manual Transmission (M86/MU3)

1. Ignition ON. Verify that no starter relay, theft deterrent, engine, or clutch pedal DTCs are set that would cause the ECM or PCM to disable starting.

⇒	If DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .

2. Observe the Crank Request parameter with a scan tool, in Engine Electrical, Data Display, Engine Control Module. Turn the ignition switch to the START position. Verify that the scan tool Crank Request parameter is Yes.

⇒	If the scan tool Crank Request parameter is [No], refer to Power Mode Mismatch .

3. Ignition ON, clutch pedal pressed. Observe the Clutch Start Switch parameter with a scan tool, in Engine Controls, Data Display, Engine Control Module, Engine Data. Verify that the scan tool Clutch Start Switch parameter is Applied.

⇒	If not the specified value refer to Circuit/System Testing: Clutch Start Switch Circuit Malfunction.

4. Ignition ON, clutch pedal pressed. Observe the Starter Relay Command parameter with a scan tool, in Engine Electrical, Data Display, Engine Control Module. Turn the ignition switch to the START position.

⇒	If the solenoid engages but the engine does not crank, refer to Starter Solenoid Clicks, Engine Does Not Crank .

⇒	If the scan tool Starter Relay Command parameter is On, but the solenoid does not engage, refer to Circuit/System Testing: Crank Relay Circuit Malfunction.

PNP Switch Circuit Malfunction (MN5)

1. Inspect the PNP switch for proper adjustment. Refer to Park/Neutral Position Switch Adjustment .
2. Ignition OFF. Disconnect the C1 connector from the ECM.
3. Ignition ON, transmission in PARK. Probe terminal 6 of the ECM C1 connector with a test lamp that is connected to ground. Verify that the test lamp does not illuminate.

⇒	If the test lamp illuminates, replace the ECM.

4. Ignition OFF. Disconnect the harness connector at the PNP switch.
5. Ignition ON. Probe the ignition circuit terminal 12 with a test lamp that is connected to ground. Verify that the test lamp illuminates.

⇒	If the test lamp does not illuminate, test the voltage supply circuit for a short to ground or an open/high resistance. If the circuit tests normal and the PRK/NEUT fuse is open, test the signal circuit terminal 1 for a short to ground.

6. Install a 3 A fused jumper wire between the ignition circuit terminal 12 and the signal circuit terminal 1. Probe terminal 6 of the ECM C1 connector with a test lamp that is connected to ground. Verify that the test lamp illuminates.

⇒	If the test lamp does not illuminate, test the signal circuit for a short to ground or an open/high resistance.

7. If all circuits test normal, test or replace the PNP switch.

Clutch Start Switch Circuit Malfunction (M86/MU3)

1. Ignition OFF. Disconnect the harness connector at the clutch start switch.
2. Ignition ON. Probe the ignition circuit terminal A with a test lamp that is connected to ground. Verify that the test lamp illuminates.

⇒	If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.

3. Verify that the scan tool Clutch Start Switch parameter is Released.

⇒	If not the specified value, test the signal circuit terminal B for a short to voltage. If the circuit tests normal, replace the ECM (L61) or PCM (LSJ).

4. Install a 3 A fused jumper wire between the ignition circuit terminal A and the signal circuit terminal B. Verify that the scan tool Clutch Start Switch parameter is Applied.

⇒	If not the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM (L61) or PCM (LSJ).

5. If all circuits test normal, test or replace the Clutch Start Switch.

Crank Relay Circuit Malfunction

1. Ignition OFF, disconnect the CRNK relay. Refer to Relay Replacement .
2. Ignition ON, transmission in Park/Neutral (MN5) or clutch pedal pressed (M86/MU3). Verify that a test lamp illuminates between the relay coil voltage supply circuit terminal and ground.

⇒	If the test lamp does not illuminate, test the PNP/clutch start switch signal circuit for a short to ground or an open/high resistance.

3. Probe the CRNK Relay switch B+ circuit terminal with a test lamp that is connected to ground. Verify that the test lamp illuminates.

⇒	If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the CRANK fuse is open, test the relay controlled output circuit for a short to ground.

4. Connect a test lamp between the relay coil ignition circuit terminal and the relay coil control circuit terminal.

Important: The engine may begin to crank.

5. Ignition ON, transmission in Park/Neutral (MN5) or clutch pedal pressed (M86/MU3). Turn the ignition switch between the RUN and START positions. The test lamp should turn ON and OFF when changing between the RUN and START ignition switch positions.

⇒	If the test lamp is always ON, test the relay coil control circuit for a short to ground. If the circuit tests normal, replace the ECM (L61) or PCM (LSJ).

⇒	If the test lamp is always OFF, test the relay coil control circuit for a short to voltage or and open/high resistance. If the circuit tests normal, replace the ECM (L61) or PCM (LSJ).

6. Connect the CRNK relay.
7. Install a test lamp between the starter S terminal and ground.

Important: The engine may begin to crank.

8. Ignition ON, transmission in Park/Neutral (MN5) or clutch pedal pressed (M86/MU3). Turn the ignition switch to the START position. The test lamp should illuminate.

⇒	If the test lamp does not illuminate, test the relay controlled output circuit for an open/high resistance. If the circuit tests normal, test or replace the CRNK relay.

9. If all circuits test normal, test or replace the starter.

PNP Switch (MN5)

1. Ignition OFF, disconnect the harness connector at the PNP switch.
2. With the PNP switch in the following positions, test for infinite resistance between the ignition terminal 12 and the signal terminal 1.

•

R

•

OD

•

D

•

2

•

1

⇒	If not the specified value, replace the PNP switch.

3. With the PNP switch in the following positions, test for less than 2.0 ohms between the ignition terminal 12 and the signal terminal 1.

•

P

•

N

⇒	If greater than the specified range, replace the PNP switch.

Clutch Start Switch (M86/MU3)

1. Ignition OFF, disconnect the harness connector at the clutch start switch.
2. With the switch in the open position, test for infinite resistance between the B+ terminal A and the signal terminal B.

⇒	If not the specified value, replace the clutch start switch.

3. With the switch in the closed position, test for less than 2.0 ohms between the B+ terminal A and the signal terminal B.

⇒	If greater than the specified range, replace the clutch start switch.

CRANK Relay

1. Ignition OFF, disconnect the CRNK relay. Refer to Relay Replacement .
2. Test for 60-180 ohms between terminals 85 and 86.

⇒	If not within the specified range, replace the relay.

3. Test for infinite resistance between the following terminals:

•

30 and 86

•

30 and 87

•

30 and 85

•

85 and 87

⇒	If not the specified value, replace the relay.

4. Install a 20 amp fused jumper wire between relay terminal 85 and 12 volts. Install a jumper wire between relay terminal 86 and ground. Test for less than 2.0 ohms between terminals 30 and 87.

⇒	If greater than specified range, replace the relay.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.