Question about 2003 Buick Rendezvous

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Tps voltage high

The engine idles at 2500 rpm cold or hot, i measured voltage at tps it is 11.5 volts instead of 5 volts. anybody have this problem. This is a 2003

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  • kjjf Nov 10, 2008

    The problem was a short to 5 volt from the 12 volt supply.



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Is the tps adjustable on set screws? is something holding the throttle plate open a bit? throttle bore gummed up? a normal tps sweep is about .6 with throttle closed and about 5 volts wide open throttle(key on/engine off) 2nd check for vacuum leaks. what about mass airflow readings?

Posted on Nov 09, 2008


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Wh is my 1999 v6 camry engine reving

Locate the Idle Air Control (IAC) valve and verify that there is good hot coolant flowing to the valve. The valve has a built-in thermo element to open the valve further when the engine is cold.

2. If the coolant lines are good and hot, locate the 3-cavity connector on the IAC valve. The Yellow/Black (Y/B) wire is the ground for the closed windings of the valve. Back probe the Y/B wire and with the car running ground the wire, the idle should slow way down and possibly stall the engine. If it does not slow way down, look for a sticking IAC valve.REMOVE IAC VALVE, CLEAN WITH CARB. CLEANER, ACTUATE VALVE WITH A POWER PROBE TO OPEN AND CLOSE VALVE. REINSTAL.
1. At the idle speed control valve, use a volt meter to measure the voltage on the open and close winding. The open winding should be approximately 3 volts cranking and 5 volts when the key is released. The voltage should slowly climb towards 7.5 volts. The close winding will start out at 11 volts and slowly drop towards 8.5 volts.

2. Monitor the coolant sensor voltage using a volt meter. Do not use the scanner only.

3. Check that the power steering pressure switch is not on.

4. Check that the throttle position sensor signal voltage is .49 volts at closed throttle.

5. Use the scanner to check any other inputs to the computer.

Mar 30, 2015 | Cars & Trucks

1 Answer

94 Jeep Cherokee TPS - back feed

You are still getting high or low voltage at tps? What is the voltage and do you have a unstable idle? Put you + lead on terminal 3 and - lead on terminal 1 turn ignition on and check voltage to be at approximately 5 volts. You can also back probe with it connected at center wire and ground probe to a good ground at engine. Turn ignition on it should read between 0.20 - 0.90 slowly manually open throttle it should rise all the way to 4.5 voltd at full open. If its bad change tps if no 5.0 volts from pcm on first test check connections at pcm. The center tps connector supply wire comes from pin 22 and connection 3 ( which is 5 volt supply ) comes from pin 6. You should be able to back probe pin 6 turn ignition on and have 5 volts. If not 5 v brain has problem.

Sep 08, 2014 | 1994 Jeep Cherokee

1 Answer

ECM Trouble shooting

Don't even THINK about replacing the PCM right now. That's way down the list of possibles.The P0102 can be caused by a significant vacuum leak and that would also cause a very high idle speed. Check the air duct that runs from the MAF to the intake. Look for anything that would let in unmetered air. The P0122 is pretty easy to check. Remove the plug from the TPS and measure reference voltage (key in RUN position) on the gray wire. It should be 5V dc. If it's not, backprobe the gray wire right at the PCM at pin 16. You should see 5-volts there. If you do, then you have a wiring issue between the PCM and TPS. The reference voltage is spliced between the PCM and the TPS. The splice provides the 5v to the linear EGR vavle, MAP and fuel tank pressure sensor.

Until you check the reference voltage, you have NO basis to think that the problem is in the PCM.

Oct 13, 2017 | 1996 Buick LeSabre

1 Answer

03 caravan showing codesP0123 and P0121. Can anyone help me with this. The van is not shifting gears properly. Thanks!

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
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.

Hope helps

Apr 19, 2012 | 2003 Dodge Caravan

1 Answer

Po123 04 kai

Hello www_ropesmor,

This code P0123 is Throttle position sensor circuit high input.

There four basic reasons for this code.

1. An open or short to ground between the TPS (throttle position sensor) and the ECM (Engine control module).
2. A short to battery voltage between TPS and the ECM.
3. A short between the TPS wires.
4. A faulty TPS.

See below for connector diagrams.

First, with scan tool monitor TPS with throttle closed voltage should be
I f you don't have a scan tool, back probe terminal 1with a volt meter to ground and you will see the voltage as outlined above otherwise follow the steps below.

1.Check to see if there is about 5 volts at the TPS; with engine off key on disconnect the TPS back probe the harness side terminal 3 to ground with a volt meter if there is about 5 volts go to step 2 if about 5 volts if not repair the 5 volt circuit.

2. Probe the harness side terminal 2 to chassis ground with a volt meter, if voltage above .02 repair circuit 2 short to voltage. If voltage is .02 volts or below go to step 3.

3. Probe the harness side terminal 1 to ground with volt meter if below .5 volts go to step 4 if not repair short to battery between TSP harness and ECM connector

4 Turn the ignition off and disconnect the ECM connector . With an ohm meter measure the resistance between the ECM (terminal C18) and TPS ground circuit it should be below 1 ohm. Measure the resistance between the ECM (terminal C8) and TPS signal circuit it should be below 1 ohm. If not repair the open circuit.

After faulty circuit is found and repaired clear code and verify repair.



I hope this helps.



Aug 15, 2011 | 2004 Kia Optima

1 Answer

My 1993 cadillac deville feels as if the rpm's are running high (idle seems too high) the service engine soon light ocassionally comes on and I get the error code E30. Anybody have any ideas??

The error is indicating that the Throttle Position Sensor (TPS) is out of the normal range with respect to the Idle Speed Control (ISC). Try something really simple and inexpensive first by removing the air ducting between the air filter box and the throttle body. Clean the throttle body interior and throttle plate with a cloth sprayed with WD40. Turn the throttle plate by pushing it at the top with your fingers and clean the throttle throat behind the plate as best you can. Reassemble the ducting and ensure that there are no air leaks at the junctions and no splits. Turn the key to position 2 (engine not running) and depress the accelerator pedal to the floor and then back up again. Start the car and nine times out of ten that should fix it. The TPS measures the opening angle of the throttle plate. The TPS is device consisting of a circular carbon track with a slider, corresponding to the throttle plate, sweeping along it. It as three wires to it, two to provide the 0 to 5 volt range along the length of the carbon track and the third to measure the voltage at the contact point of the slider. To check the TPS measure the voltage of the middle pin of the connector when the ignition is at position 2 (engine off) as you push the throttle plate open and closed by pressing on the accelerator pedal. The voltage should alter in a smooth continuous way. Any drop outs of signal indicate a worn carbon track and the TPS should be replaced.

May 09, 2011 | 1993 Cadillac DeVille

1 Answer

I have a 1991 toyota MR2 when engine is cold idles over 2000 rpm

OK a fast idling engine is due to too rich a fuel to air mixture. When the engine is cold the ECU enriches the fuel mix initially to ensure a normal fast idle (1000rpm) before leaning the mix to drop back to 700rpm when warmed up. The following spring to mind as possible areas for further checking:-
1) Intake air temperature sensor fault - How to Check? Unplug the device from the air duct and check that it is clean. Whilst out, put a voltmeter across the contacts and measure the resistance due to the ambient air temperature. If you then breathe on it, raising the local air temperature around the probe, you will see the resistance change as a consequence. You are looking for a change in resistance in line with a change of air temperature. If there is infinite resistance, consistent with a broken circuit, or there is no measurable response to change in air temperature then the IAT is faulty
2) Oxygen exhaust sensor fault - How to check? An issue with oxygen sensors is that they steadily lose effectiveness with age and they can under perform for quite a while before they trigger an error code on the ECU. Ensure the connection to the oxygen sensor is robust and clean. As the oxygen sensor only works when hot there is the danger of getting burnt by working on it so a safe approach is to find the electrical connection on the wiring harness remote from the oxygen sensor and to make voltage measurements there. Most garages have systems that can record the amplitude and frequency of the voltage peaks being produced by the oxygen sensor. A less sophisticated means to get some impression of the oxygen sensor function is to use a moving coil galvanometer type voltmeter (analogue needle on dial). Setting the voltage range to 1 volt and by attaching the meter leads across the sensor wires it should be possible to see the rhythmic pulsing and the voltage range of the operating sensor output. If no pulses are seen it could be either a break in the wire or a fault with the sensor itself.

3) Fuel Pressure regulator - How to check? When the engine is at idle, disconnecting the vacuum line to a healthy FPR should result in a temporary surge in engine revs for a few seconds as the immediate loss of vacuum to the FPR causes an immediate build up in fuel pressure. At each injection cycle a little more is injected causing the engine to build up revs. In the next few seconds the gradual ingress of unmetered air into the plenum, also caused by the disconnected vacuum tube, begins to upset the stable idle of the engine. The engine will suffer from rough idle until the vacuum line is reconnected. Most of the injection inputs will be crudely governed by signals received from the MAP sensor and feedback from the oxygen sensor.

4) Engine coolant sensor fault - How to check? Most often the coolant sensor is quite separate to the temperature sender, so a correct read-out on the dash board does not necessarily indicate correct sensor function. Using a voltmeter the resistance across the electrical terminals on the sensor can be measured. By removing the device from the car and putting the end of the sensor in a pan of hot water it should be possible to see an immediate change in resistance, it does not matter so much that the resistance goes up or down but that there is a discernable change with change in temperature. Generally high resistance equates to cold temperatures and vice versa. If there is no resistance change commensurate with temperature change then the sensor is at fault. If there is simply no resistance measurable (open circuit) then the sensor is at fault. If the sensor is working correctly check the connector, the wiring and the wiring insulation for faults and possible shorting
5) Low coolant - When engine is cold put interior heater setting to MAX and fan to OFF. Fill the coolant reservoir and leave the cap off whilst you switch the engine on. Squeeze top radiator hose to encourage air movement. After about a minute replace the coolant filler cap firmly. 6) Throttle position sensor fault - How to check? The socket for electrical connection with the TPS has 3 pins, one for 'ground', one for 5 volts 'reference' and a third (generally the middle one) for 'signal' output. Back probe the signal pin in the connector to the TPS. Attach the positive lead of a voltmeter to the probe and measure the voltage output as the throttle plate is rotated. If working correctly the meter should show a voltage consistent with the throttle position from approximately 1 volt when closed and 5 volts when fully open. What is looked for is smooth voltage increase with throttle change. If there are drop outs in the transition or that there is no transition seen, the TPS is faulty.

Nov 10, 2010 | 1991 Toyota MR2

1 Answer

2004 silverado with dual manual temperature controls. Will not blow hot air out of driver side vents.

could be your controller or temp mix door

1. Gain access to the air temperature motor for circuit testing. There are 5 wires at the motor.

2. The Brown wire is ignition power.

3. The Yellow wire is a ground at all times, through the control head.

4. The Light Blue/Black wire carries a 5-volt reference from the control head to the temperature motor.

5. The Light Blue wire is the feedback circuit to the control head and should measure between about 1 volt (cold) and 4 volts (hot). This feedback circuit operates similarly to a Throttle Position Sensor (TPS).

6. The Dark Blue wire is the motor control circuit sent from the control head.

7. When the control head sends out 5 volts on this wire, the motor moves towards hot.

8. When the control head sends out 0 volts, the motor moves towards cold.

9. When the temperature motor reaches the correct position (as measured by the feedback voltage on the Light Blue wire), the control head sends out 2.5 volts. This voltage signals the temperature motor to STOP and hold its present position.

10. Check for correct operation of these voltages.

11. In some cases, the air temperature door doesn't fit correctly in the plenum and will cause the air temperature motor to travel too far. This will cause the control head to become confused and operate erratically.

Oct 11, 2009 | 2004 Chevrolet Silverado 1500 Crew Cab

1 Answer

2000 Saturn LS, high idle durning cold weather. (2500 rpm)

Scan for codes, post any that are found, it could be a bad TPS sensor. Could also be a build up of carbon on the top (valve) portion of the engine. Try a few cans of "Sea Foam" through the intake manifold.

Dec 27, 2008 | 2000 Saturn Ls 4dr Sedan

1 Answer

1909 buick skylark tps low volts trouble code

replace ignition coil make sure by dealer the right mode is used when ordering if not ordered right you will get a difference in engine volts

Jun 07, 2008 | 1991 Isuzu Pickup

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