I'VE REPLACED THREE TPS AND STILL GET SAME CODE 26 (E26) ,TPS SHORTED,IDLES VERY ROUGH AND HAS MISS WHEN DRIVING EVEN @ 55MPH. ALSO GET CODE 38 (E38) ,OPEN MAP SENSOR CIRCUIT ,HAVE REPLACED MAP TWO TIMES. I'VE RESET CODES BY USE OF ON BOARD COMPUTED THROUGH THE TEMP. BUTTONS AND ALSO FROM OUTSIDE CODE READER. I SET THE IDLE UP TO KEEP RUNNING AND OF COURSE NOW HAVE MORE CODES : 19 / 23 /30 I NEED THE CAR TO GET TO AND FROM VA HOSPITAL WHICH IS 2 1/2 HRS. ONE WAY. " HELP ME PLEASE " THANK YOU, JB
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The generic basics for a rough idle on any vehicle is to check for a leak of some kind, fuel--egr--vacuum leak, something of that nature. I'm not sure why you replaced the tps, unless you got a code of some kind? The code doesn't tell you what to replace. With any electrical sensor, I'd want to check wiring circuits, first, before replacing.
Clean the throttle body and idle air system, see if it helps. Your saying it runs good, off idle?
Are your rpm's low when sitting at a stop light and vehicle warmed up? You could check your TPS (Throttle position sensor) or maybe your egr is plugging up, or one of your plugs or wires could have gone bad, maybe the coil on one of the wires is bad. You really need to plug a code reader into the ECU and see if there is a code being thrown. And NO, all codes will not cause the engine light to come on.
Without trouble codes you are fishing in the dark. If the engine has a cylinder that is dead at idle from a fuel injector or ignition problem, it should have a code for a miss on that cylinder. A mechanical problem like a burned valve could cause the problem without setting a code. Have you checked compression on all 4 cylinders ? ?
Hi there: P0121 - Throttle Position Sensor/Switch A Circuit Range/Performance
The Throttle position sensor is a potentiometer that measures the amount of throttle opening. As the throttle is opened, the reading (measured in volts) goes up. The powertrain control module (PCM) supplies a 5 Volt reference signal to the throttle position sensor (TPS) and usually a ground also. A general measurement is: at idle = .5 Volts; full throttle = 4.5 Volts. If the PCM detects that the throttle angle is greater or less than it should be for a specific RPM, it will set this code.
Symptoms of a P0121 trouble code could include:
Malfunction Indicator Lamp (MIL) illumination (Check Engine Light or Service Engine Soon light) Intermittent stumble on acceleration or deceleration Blows black smoke on acceleration No start
A code P0121 may mean that one or more of the following has happened: TPS has intermittent open or short internally Harness is rubbing and causing an open or short in the wiring Bad connection at the TPS Bad PCM (less likely) Water or corrosion in connector or sensor
Possible Solutions: 1. If you have access to a scan tool, see what the idle and WOT (wide open throttle) readings are for the TPS. Check if they're close to the specifications mentioned above. If not, then replace the TPS and re-check.
2. Check for an intermittent open or short in the TPS signal. To do that, you can't use a scan tool. You'll need an oscilliscope. The reason is because scan tools take samplings of many different readings over just one or two data lines and can miss an intermittent drop out. Hook up your oscilliscope and watch the signal. It should sweep up and down smoothly with no drop outs or spikes.
3. If no problems were noticed, perform a wiggle test. Do this by wiggling the connector and harness while watching the pattern. Does it drop out? If so, replace TPS and re-check.
4. If you have no TPS signal, check for 5 Volt reference at the connector. If it's present, check the ground circuit for open or shorts.
5. Make sure the signal circuit isn't 12V. It should never have battery voltage. If it does, trace circuit for short to voltage and repair.
6. Look for any water in the connector and replace TPS as necessary.
P0123 Code - Throttle Position Sensor/Switch A Circuit High Input A P0123 code means that the the car's computer has detected that the TPS (throttle position sensor) is reporting too high a voltage.
Symptoms may include: Rough idle High idle Surging other symptoms may also be present
A code P0123 may mean that one or more of the following has happened: TPS not mounted securely TPS circuit short to ground or another wire Faulty TPS Damaged computer (PCM)
Possible Solutions If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
If there are symptoms such as the engine is stumbling or hesitating, carefully inspect all wiring and connectors that lead to the TPS. More than likely the problem is with the TPS wiring. Check the voltage at the TPS (refer to a service manual for your vehicle for this specific information). If the voltage spikes or is too high (over 4.65 volts with key on, engine off), then that is indicative of a problem. Carefully trace each wire from the TPS wiring harness to check for breaks, rubbing against other components, etc.
E26-shorted throttle signal switch E32-open MAP sensor signal E70-Intermittent TPS signal E97-High RPM P/N to D/R Shift
some could be history codes not currents tho maybe try to clear then drive it and see what comes back. Press off and high simultaneously to clear codes and this link may help http://www.cadillacforums.com/forums/ht4100-4-1-4-5-4/21558-obd-i-codes-4-x-engines.html
Hello! I suspect the Throttle Positioning Sensor (TPS) is not reaching full voltage at full throttle...It can be tested to validate it as the faulty component...Do you have a volt meter and are you comfortable taking a couple readings? If so, the TPS is bolted to the throttle body...It has a three wire connector with the following wire colors...Brown/White...Orange...And Gray/White...Set the meter to read 5 volts...Push a safety pin into the rear of the in-place connector on the Gray/White wire...Another into the rear of the connector on the Brown/White wire...Connect the + probe of the meter to the Gray/White...And the - to the Brown/White...Start the engine...At idle meter should read less then 1 volt (.85)...Increase throttle to full...Meter should read 4 volts...Also, as you are increasing the throttle meter must rise to 4 volts smoothly...If reading jerks or acts erratic the TPS is defective...Below is a picture of the TPS...Cost is around $40...
E26 - Shorted Throttle Switch Circuit
E27 - Open circuit in throttle switch
On these 2 codes replace the TPS and clear codes (throttle position sensor). E52PCM/ECM Memory Reset
Have u cleared the memory? don't worry about this code.