okay how do i pull codes from the PCM on a 93 cutlass? is it something to do with turning the ignition on and off 3 times?
location of where to jump it?
* Ground terminals A and B (see diagram below) with the ignition "ON" and engine not running. The system will enter the diagnostic mode. In this mode, the computer will display a Code 12, three consecutive times, by flashing the "CHECK ENGINE", "SERVICE ENGINE SOON" or "MALFUNCTION INDICATOR LAMP" or light. A Code 12 consists of one flash, a short pause, then two flashes in rapid succession. * After Code 12 is displayed, any stored trouble codes will be displayed by flashing the "CHECK ENGINE", "SERVICE ENGINE SOON" or "MALFUNCTION INDICATOR LAMP" light. All codes are displayed 3 times each then a code 12 will repeat. In the diagnostic mode, the computer will also energize all computer controlled relays and solenoids.
awesome thank you, well i just pulled the code, it blinked 4 times then a pause, then it blinked 4 more times. any idea what code that is? i dont know how to read GM codes, only hondas lol
This is the description of a Code 44 as set on GM products It is an indication of a lean mixture as indicated by the oxygen sensor readings.
Circuit description: The ECM supplies a voltage of about .45 volts between the appropriate terminals of the sensor. (If measured with a ten megohm DVM, this may read as low as .32 volt). The O2 sensor varies the voltage within a range of about one volt, if the exhaust is rich, down thru about .10 volt, if exhaust is lean.
The sensor is like an open circuit and produces no voltage, when it is below about 360 degrees C, 600 degreeF. An open sensor circuit, or a cold sensor, causes Open Loop operation.
Test description:
1.) Code 44 is set when the O2 sensor signal voltage remains below .3 volts for 50 seconds or more and the system is operating in “closed loop”.
Diagnostic aides:
The code 44 for lean exhaust is most likely caused by one or more of the following:
1.) O2 sensor wire - Sensor pigtail may be mispositioned and contacting the exhaust manifold.
2.) Check for an intermittent ground wire between connector and sensor.
3.) Poor ECM to engine block ground.
4.) MAF Sensor - A MAF sensor that causes the ECM to sense a lower than normal airflow will cause the system to go lean. Disconnect the MAF sensor. If the lean condition is gone then replace the MAF sensor.
5.) Vacuum leaks can cause a lean condition and/or possibly a high idle. Check for cracked hoses a bad gasket or a faulty EGR or PCV Valve.
6.) fuel pressure - system will go lean, if pressure is too low. It may be necessary to monitor fuel pressure while driving the car at various road speeds and/or loads to confirm.
7.) Clogged injector or lean injector - perform an injector balance test…
Let the testing begin
ahh thank you very much
J&J, did you get that infor from a service manual/cd or similiar? If so what one? I need a some OBDI manuals.