DTC P1779 P1791 P0123 P0222 PRESENT
Hi there:
Sound like a electrical problem there...
DTC P1779 - Engine Torque Delivered to TCM Signal
Engine torque signal below lower limit delivered to TCM. I've read these occur when there is a communication problem between ECM and TCM (Transmission Control Module).
DTC P1791 - Transmission Control Module LoopThe P1779 and P1791 codes set as a result of the other DTC (P0128). When the ECM sets certain trouble codes, these codes will set in the TCM (Transmission Control Module). The TCM will also increase tranmission pressures, which results in the harsh shifting.
DTC P0123 - Throttle/Pedal Position Sensor/Switch "A" Circuit HighTP sensor signal circuit is shorted to sensor ground. TP sensor signal circuit is open (except 1996-1998 models). TP sensor VREF circuit is open between sensor and PCM. TP sensor is damaged or it failed (it may be shorted).
DTC P0222 - Throttle/Pedal Position Sensor/Switch "B" Circuit LowThe Throttle control module contains two throttle position (TP) sensors with a common 5 volt supply, a common ground, and two independent signal circuits that vary resistance according to changes in throttle plate position. The ECM measures the signal voltage from each TP sensor, which is a reduced value of the ECM 5 volt reference. As the throttle plate opens from 0% throttle to wide open throttle, the voltage on the TP sensor 1 signal increases from 0.6 (+/-0.2) volts to 4.3 (+/-0.2) volts, while the voltage on the TP sensor 2 signal decreases from 4.4 (+/-0.2) volts to 0.76 (+/-0.2) volts.
If both P0122 and P0222 are set, circuit 486 may be either open or shorted to ground.
Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.
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Testimonial: "THANKS AGAIN Z J FOR YOUR INPUT ON MY PROBLEM. HAVE NOT CHECKED EGR YET BUT ITS WORTH A TRY. I WILL TRY ANYTHING AT THIS POINT. NOW WONDERING IF IT MIGHT BE MAF SENSOR? I WILL TRY AGAIN TOMARROW. THANKS AGAIN Z MAN!"
Are you try to clean and test the EGR valve and recheck the TPS? Keep in midn that this decreasing or increasing voltage signal is used by the PCM to manage the Air Fuel Ratio and Spark Timing of the engine as well as other emissions system components. In your measure test, pay attention at closed Throttle Position it should read 0.3 volts and wide open Throttle at 4.6volts. Check air intake system and measure air flow test.
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SOURCE: 2001 saturn is sputtering, service engine soon
when you stared it does it started and then shut off if it does check you fuel filter and you mafs ok and all your wireing
SOURCE: 2000 saturn sl2 service engine
Hi
this could be a number of things the ECM light is an ecu reporting error, put the car on a daignostic machine and get the fault code reading then get back to me and I will tell you what it is. It could be so many things so really the diagnostic engine check is the best way.
Regards
Dan
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say zj gene here.I AM VERY GRATEFUL FOR YOUR INSIGHT ON MY PROBLEM.SO FAR I HAVE REPLACED MAIN RELAY .TPS . PEDAL POSITION SENSOR.INTIRE ENGINE WIREING HARNESS.COOLENT TEMP. SENSOR.AND TWO O2 SENSORS.STILL SAME THING STUCK IN LIMP MODE. ONE ODD THING WHEN U FIRST TURN ON KEY AND TRY TWO START CAR IT WONT START.BUT IF U WAIT AFTER U FIRST TURN KEY ON NO CRANK ALL THE INDERCATERS GO OFF ON THE INSTERMENT CLUSTER THEN WHEN THEY COME BACK ON ALL U HAVE IS SOME OF INDACATERS ON AND TPS MOTOR MAKES CLICKITY CLICKITY NOISE CAR STILL WONT START OR SCAN BUT I UNPLUG THE TPS CAR STARTS SCANTOOL WORKS.STUCK IN LIMP MODE. PLUG TPS BACK IN CAR DIES OR ALMOST DIES AN STILL IT IS STUCK IN LIMPMODE
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