PUSH-BUTTON START SYSTEM FAULT DIAGNOSIS

• US 20170096958A1
• Filed: 10/01/2015
• Published: 04/06/2017
• Est. Priority Date: 10/01/2015
• Status: Active Grant

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations LLC (General Motors Company)
• Inventors: Jiang, Shengbing, McCullough, Scott A.
• Granted Patent: US 10,337,438 B2
• Time in Patent Office: Days
• CPC Class Codes: B60R 25/04 operating on the propulsion system, e.g. engine or drive motor
• CPC Class Codes: F01N 11/00 Monitoring or diagnostic devices for exhaust-gas treatment apparatus , e.g. for catalytic activity safety, indicating or supervising devices for internal combustion engines F02B77/08; testing of machines G01M13/00
• CPC Class Codes: F02D 2041/228 Warning displays
• CPC Class Codes: F02D 41/221 relating to the failure of actuators or electrically driven elements
• CPC Class Codes: F02N 11/0803 characterised by means for initiating engine start or stop F02N11/0814 takes precedence
• CPC Class Codes: F02N 11/0822 related to action of the driver
• CPC Class Codes: F02N 11/108 for diagnosis of the starter or its components
• CPC Class Codes: F02N 2200/102 Brake pedal position
• CPC Class Codes: F02N 2300/2011 Control involving a delay; Control involving a waiting period before engine stop or engine start

Abstract

A method for diagnosing a no-start fault of a vehicle push-button start system including a push-button switch, where the system starts a vehicle engine if the switch is pressed and a vehicle brake is applied. The method includes detecting that a no engine crank condition has occurred if the switch is pressed and the brake is applied, and if so, performs a no crank diagnosis. The method also includes determining that a starter control relay has not been enabled after the system is in a crank power mode, and if so, performs a starter not-enabled diagnosis. The method also includes determining that the starter control relay has been disabled before the engine is running, and if so, performs a start disable diagnosis. The method also includes determining that the engine has stalled within some minimum time after it has successfully been started, and if so, performs an engine stall diagnosis.

Claims

1. A method for diagnosing a no-start fault of a vehicle push-button start system including a push-button switch, where the start system starts a vehicle engine if the switch is pressed and a vehicle brake is applied, said method comprising:

determining that a no engine crank condition has occurred if the switch is pressed and the brake is applied, and if so, performing a no crank diagnosis;

determining that a starter control relay has not been enabled after the system is in a crank power mode, and if so, performing a starter control relay not-enabled diagnosis;

determining that the starter control relay has been disabled before the engine is running, and if so, performing a starter control relay disabled diagnosis; and

determining that the engine has stalled within some minimum time after being started, and if so, performing an engine stall diagnosis.

2. The method according to claim 1 wherein performing each of a no crank diagnosis, a starter control relay not-enabled diagnosis, a starter control relay disabled diagnosis and an engine stall diagnosis includes reading diagnostic trouble codes (DTCs), parameter identification (PID) values, signal values stored in an electronic control unit memory and signal bus messages.

3. The method according to claim 1 wherein performing each of a no crank diagnosis, a starter control relay not-enabled diagnosis, a starter control relay disabled diagnosis and an engine stall diagnosis includes checking a vehicle battery, checking an electronic control module (ECM), and checking power and ground connections.

4. The method according to claim 1 wherein performing a no crank diagnosis includes determining whether a body control module (BCM) does not identify that the brake has been applied, but an electronic control module (ECM) does detect that the brake has been applied, and if so, checking for brake apply sensor loose wires and any associated diagnostic trouble code (DTC).

5. The method according to claim 1 wherein performing a no crank diagnosis includes determining whether a fob has been detected and validated, and if not, checking to determine if a challenge from a passive entry passive start (PEPS) module has been received by a body control module (BCM), if not checking for signal bus failure and PEPS module faults and associated diagnostic trouble codes (DTCs), otherwise checking for low frequency antenna wire failures on a low frequency communications link, checking that the fob is working properly, checking an RF receiver or wire faults on an RF communications link, and/or checking for BCM faults and associated DTCs and parameter identification (PID) values.

6. The method according to claim 1 wherein performing a no crank diagnosis includes determining whether a steering column has been unlocked, and if not, checking for diagnostic trouble codes (DTCs) for wire failure or hardware lock failure, checking DTCs for relay or coil faults, checking DTCs for electrical steering column lock module failure, and/or checking DTCs for fault of a feedback circuit to the BCM.

7. The method according to claim 1 wherein performing a no crank diagnosis includes determining that a body control module (BCM) has failed, and if so, checking the BCM, and/or checking power and ground connections to the BCM.

8. The method according to claim 1 wherein performing a starter control relay not-enabled diagnosis includes determining whether a run/crank relay has been activated, and if not, checking whether body control module (BCM) and passive entry passive start (PEPS) module wires to the run/crank relay are faulty, checking the run/crank relay, and/or checking relay input wires to an electronic control module (ECM).

9. The method according to claim 1 wherein performing the starter control relay not-enabled diagnosis includes determining whether the vehicle is in gear during the start, and if so, checking for gear sensor or circuit faults and associated diagnostic trouble codes (DTCs) and parameter identification (PID) values.

10. The method according to claim 1 wherein performing a starter control relay not-enabled diagnosis includes determining whether a vehicle theft deterrent operation has failed, and if so, checking for theft deterrent diagnostic trouble codes (DTCs), checking for an incorrect pre-release password, checking for an incorrect immobilization key, checking for a no response from a body control module (BCM), checking whether a secrete key has been programmed, checking for slave module identification failure, checking for a no challenge request from an electronic control module (ECM), and/or checking for an incorrect immobilization identification from slave modules.

11. The method according to claim 1 wherein performing a starter control relay not-enabled diagnosis includes determining that the engine has been shut down, and if so, checking for corresponding diagnostic trouble codes (DTCs).

12. The method according to claim 1 wherein performing a starter control relay not-enabled diagnosis includes determining that a selective catalytic reduction (SCR) warning is active, and if so, checking an SCR warning device and any associated diagnostic trouble codes (DTCs).

13. The method according to claim 1 wherein performing a starter control relay disabled diagnosis includes determining whether the vehicle is in gear during the start, and if so, checking for gear sensor or circuit faults and associated diagnostic trouble codes (DTCs) and parameter identification (PID) values.

14. The method according to claim 1 wherein performing a starter control relay disabled diagnosis includes determining that there is no engine rotation after a predetermined minimum engine crank time, and if so, checking for diagnostic trouble codes (DTCs) for starter control or relay circuit faults, and/or checking a starter relay motor and solenoid.

15. The method according to claim 1 wherein performing a starter control relay disabled diagnosis includes determining that the engine has been shut down, and if so, checking for corresponding diagnostic trouble codes (DTCs) to identify failures.

16. The method according to claim 1 wherein performing a starter control relay disabled diagnosis includes determining that an ignition input power mode is not in a crank power mode after a minimum crank time, and if so, checking for body control module (BCM) and passive entry passive start (PEPS) module wires to a run/crank relay, checking the run/crank relay, and/or checking input wires to an electronic control module (ECM).

17. The method according to claim 1 wherein performing a starter control relay disabled diagnosis includes determining whether a vehicle theft deterrent operation has failed, and if so, checking for theft deterrent diagnostic trouble codes (DTCs), checking for an incorrect pre-release password, checking for an incorrect immobilization key, checking for a no response from a body control module (BCM), checking whether a secrete key has been programmed, checking for slave module identification failure, checking for a no challenge request from an electronic control module (ECM), and/or checking for an incorrect immobilization identification from slave modules.

18. The method according to claim 1 wherein performing a starter control relay disabled diagnosis includes determining whether an accessory wake up has been activated after a predetermined cranking period, and if so, checking for a diagnostic trouble code (DTC) wire short, checking a passive entry passive start (PEPS) module, and/or checking a body control module (BCM).

19. The method according to claim 1 wherein performing a starter control relay disabled diagnosis includes determining whether a engine crank request is not confirmed after an extended engine cranking period, and if so, checking whether a crank power mode is active, checking for CAN bus and electronic control module (ECM) faults, checking whether the switch has been pressed, and/or checking for body control module (BCM) faults.

20. The method according to claim 1 wherein performing a starter control relay disabled diagnosis includes determining whether engine cranking has occurred for a maximum crank time without the engine starting, and if so, checking the starter system, a fuel system, an engine system and/or a vehicle battery.

21. The method according to claim 1 wherein performing an engine stall diagnosis includes determining whether a run crank relay is inactive, and if not, checking whether a body control module (BCM) and passive entry passive start (PEPS) module wires to a run/crank relay are faulty, checking the run/crank relay, and/or checking relay input wires to an electronic control module (ECM).

22. The method according to claim 1 wherein performing an engine stall diagnosis includes determining whether a vehicle theft deterrent operation has failed, and if so, checking for theft deterrent diagnostic trouble codes (DTCs), checking for an incorrect immobilization key, checking for a no response from a body control module (BCM), checking whether a secrete key has been programmed, checking for slave module identification failure, checking for a no challenge request from an electronic control module (ECM), and/or checking for an incorrect immobilization identification from slave modules.

23. The method according to claim 1 wherein performing an engine stall diagnosis includes determining that the engine has been shut down, and if so, checking for corresponding diagnostic trouble codes (DTCs) to identify failures.

24. The method according to claim 1 wherein performing an engine stall diagnosis includes determining whether a starter control relay has an electrical short, and if so, checking for wire short faults and associated diagnostic trouble codes (DTCs).

25. A method for diagnosing a no-start failure of a vehicle push-button start system for a vehicle engine that includes a push-button switch, said method comprising determining that one or more of a no engine crank condition, a starter control relay has not been enabled, the starter control relay has been disabled before the engine is running, and the engine has stalled within some minimum time after being started has occurred.

26. The method according to claim 25 wherein determining that one or more of a no engine crank condition, a starter control relay has not been enabled, the starter control relay has been disabled before the engine is running, and the engine has stalled within some minimum time after being started has occurred includes reading diagnostic trouble codes (DTCs), parameter identification (PID) values, signal values stored in an electronic control unit memory and signal bus messages.

27. The method according to claim 25 wherein determining that one or more of a no engine crank condition, a starter control relay has not been enabled, the starter control relay has been disabled before the engine is running, and the engine has stalled within some minimum time after being started has occurred includes checking a vehicle battery, checking an electronic control module (ECM), and checking power and ground connections.

28. A method for diagnosing a no-start failure of a vehicle push-button start system for a vehicle engine that includes a push-button switch, said method comprising determining in order until the failure has been identified that a no engine crank condition has occurred, a starter control relay has not been enabled, the starter control relay has been disabled before the engine is running, and the engine has stalled within some minimum time after being started.