Circuit/System Verification

Automatic Transmission

1. Ignition ON.
2. Verify that no ignition, KR27 Starter Relay, brake pedal position sensor, theft deterrent, or automatic T12 Transmission DTCs are set that would cause the ECM to disable engine starting.
   • If DTCs are set 

     Refer to Diagnostic Trouble Code (DTC) List - Vehicle

   • If no DTCs are set 
3. Verify the scan tool 5 V Ignition Switch parameter is Crank Request while attempting to start the vehicle.
   • If parameter does not display Crank Request 

     Refer to Vehicle Will Not Change Power Mode

   • If parameter displays Crank Request 
4. Verify the scan tool TCM Internal Mode Switch parameter displays Park when in park.
   • If the TCM Internal Mode Switch parameter does not indicate Park  .

     Refer to Transmission Internal Mode Switch Logic

   • If the TCM Internal Mode Switch parameter displays Park 
5. Verify the scan tool ECM Crankshaft Position Active Counter parameter is not incrementing.
   • If the counter increments 

     Replace the B26 Crankshaft Position Sensor.

   • If the counter does not increment 
6. Verify the engine cranks in park or neutral.
   • If the KR27 Starter Relay does not click or the engine does not crank 

     Refer to Circuit/System Testing below.

   • If the engine cranks 
7. All OK

Manual Transmission

1. Ignition ON.
2. Verify that no ignition, KR27 Starter Relay, clutch pedal position sensor, brake pedal position sensor, or theft deterrent DTCs are set that would cause the ECM to disable engine starting.
   • If DTCs are set 

     Refer to Diagnostic Trouble Code (DTC) List - Vehicle

   • If no DTCs are set 
3. Verify the scan tool 5 V Ignition Switch parameter is Crank Request while attempting to start the vehicle.
   • If parameter does not display Crank Request 

     Refer to Power Mode Mismatch

4. Ignition ON.
5. Verify the scan tool Clutch Pedal Starter Inhibit Switch parameter changed between On and Off while depressing and releasing the clutch pedal.
   • If the Clutch Pedal Starter Inhibit parameter does not change 

     Refer to Clutch Pedal Position Sensor Learn

   • If the clutch pedal starter inhibit parameter does change 
6. Fully depress clutch pedal.
7. Attempt to start the vehicle.
8. Verify the scan tool ECM Crankshaft Position Active Counter parameter is not incrementing.
   • If the counter increments 

     Replace the B26 Crankshaft Position Sensor.

   • If the counter does not increment 
9. Verify the crank relay does click and the engine begins cranking.
   • If the KR27 Starter Relay does not click or the engine does not begin cranking 

     Refer to Circuit/System Testing below.

   • If the KR27 Starter Relay does click and the engine does begin cranking 
10. All OK