Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSACURA1994INTEGRA (GS-R) L4-1797CC 1.8L DOHC (VTEC)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSDESCRIPTION AND OPERATIONECM FAIL-SAFE BACK UP FUNCTIONS
1994 Acura Integra (GS-R) L4-1797cc 1.8L DOHC (VTEC)
ECM Fail-Safe Back Up Functions
1994 Acura Integra (GS-R) L4-1797cc 1.8L DOHC (VTEC)SECTION ECM Fail-Safe Back Up Functions
FAIL-SAFE FUNCTION
When an abnormality occurs in a signal from a sensor, the ECM ignores that signal and assumes a pre-programmed value for that sensor that allows the engine to continue to run.
BACK-UP FUNCTION
When an abnormality occurs in the Engine Control Module (ECM) itself, the fuel injectors are controlled by a back-up circuit independent of the system in order to permit minimal driving.
SELF-DIAGNOSIS FUNCTION MALFUNCTION INDICATOR LAMP (MIL)
When an abnormality occurs in a signal from a sensor, the ECM supplies ground for the MIL and stores the code in erasable memory. When the ignition is initially turned on, the ECM supplies ground for the MIL for two seconds to check the MIL bulb condition.
TWO TRIP DETECTION METHOD
To prevent false indications, the Two Trip Detection Method is used for the HO2S and fuel metering-related self- diagnostic functions. When an abnormality occurs, the ECM stores it in its memory. When the same abnormality recurs after the ignition switch is turned OFF and ON again, the ECM informs the driver by lighting the MIL. However, to ease troubleshooting, this function is cancelled when you short the service check connector. The MIL will then blink immediately when an abnormality occurs.
When an abnormality occurs in a signal from a sensor, the ECM ignores that signal and assumes a pre-programmed value for that sensor that allows the engine to continue to run.
BACK-UP FUNCTION
When an abnormality occurs in the Engine Control Module (ECM) itself, the fuel injectors are controlled by a back-up circuit independent of the system in order to permit minimal driving.
SELF-DIAGNOSIS FUNCTION MALFUNCTION INDICATOR LAMP (MIL)
When an abnormality occurs in a signal from a sensor, the ECM supplies ground for the MIL and stores the code in erasable memory. When the ignition is initially turned on, the ECM supplies ground for the MIL for two seconds to check the MIL bulb condition.
TWO TRIP DETECTION METHOD
To prevent false indications, the Two Trip Detection Method is used for the HO2S and fuel metering-related self- diagnostic functions. When an abnormality occurs, the ECM stores it in its memory. When the same abnormality recurs after the ignition switch is turned OFF and ON again, the ECM informs the driver by lighting the MIL. However, to ease troubleshooting, this function is cancelled when you short the service check connector. The MIL will then blink immediately when an abnormality occurs.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.