Diagnosis And Testing - Standard Starting System

No start trouble shooting: 

1. Check battery voltage.
2. Check Fuel followed by Fuel pump fuse F21.
3. Turn the ignition to start and complete the following procedures within 10 seconds (TIP start will disable after 10 seconds). Hook up the MM before turning the ignition to start.
4. 1. Measure the voltage at pin 87 of the ECM relay.
   2. If not measured remove the BCM and ECM relay. Connect test lamp between PIN 86 of BCM starter relay, PIN 85 of the ECM starter relay and start the car. Confirm the bulb lit up for 10 seconds. If the bulb is lit, the issue is either in starter motor, the starter solenoid, the wiring, loose connection or engine itself. If issue exists go to step 6.
   3. If the measured voltage equals Battery voltage then the Starting relays, BCM and ECM modules are working as designed, if there is no security key violation (The SKIM light will start flashing if there is security key mismatch and a DTC will be set by RFHM.
   4. Quick Check: Turn the radio on and turn the ignition to the start position, if the radio mutes and the car still doesn't start, then assume the issue is with the engine controller, or the engine itself.
5. If the above conditions are true, then issue is either in the starter motor, the starter solenoid, the wiring or can be a loose connection. Follow the procedure 6 to check the wiring from PIN 87 of the ECM relay and the starter solenoid. Go to step 6, If not go to step 11.
6. Connect a multi meter between the starter solenoid terminals and confirm the MM is measuring battery voltage.
7. If the voltage is equal to battery voltage, then the issue must either be in the solenoid, starter or the engine itself. If the issue cannot be identified go to step 8.
8. 1. Turn the ignition to OFF.
   2. Check the voltage at terminal 30 of the RUN/START relay (T09). If not check for loose battery connection, wiring or the fuse feed to 30.
   3. Turn the ignition to RUN and check the battery voltage at 87 of the T09 relay. If not measured go to step 9.
9. Check the BCM starter relay fuse feed and confirm it is intact.
10. Check BCM relay connections/feed.
11. Turn the ignition to start and complete the following procedures within 10 seconds (TIP start will disable after 10 seconds). Hook up the test lamp before turning the ignition to start.
12. Connect a 12V test lamp between 86 and 85 of the BCM start relay and confirm the blub lights up for 10 seconds. The MM may give a false reading because it is driven by a low side driver.
13. If the 12v test lamp does not  stay lit for 10 seconds, turn the ignition to the start position and using a DVOM, measure between battery voltage (+) and PIN 86 (-) of the BCM relay. Should read equal to battery voltage.
14. Check ECM relay connections/feed.
15. Turn the ignition to start and complete the following procedures within 10 seconds (TIP start will disable after 10 seconds). Hook up the test lamp before turning the ignition to start.
16. Connect a 12V test lamp between 86 and 85 of the ECM start relay and confirm the blub lights up for 10 seconds.
17. If not start the car and measure them individually.
18. Measure the resistance between the ground and pin 85 of the ECM start relay.

Additional diagnostic checks 

1. Check the Ignition sense start line from RFHM to BCM. The vehicle will not start if this line is not intact.
2. The RFHM must detect brake input (Normally Open) to start the KIN (Keyless Ignition Node) car in case of auto trans vehicle.
3. The RFHM must detect clutch input (Normally Open) to start the manual trans vehicle. Check also the clutch output from RFHM to ECM.
4. The RFHM must detect gated park switch to start the car.