99 jeep cherokee code P0123 TPS high voltage,replaced TPS same problem after 5 min driving.I also replaced CPS ran smoother but same code again for TPS.Now what can I do?

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.

P0113 intake air temp voltage too high
P0123 Throttle position sensor voltage too high
P0203 is injector #3 control circuit
voltage is higher that 4.9 volts short to 5 volt supply circuit

erase the codes and drive vehicle to see if the codes come back if they do you have a hard code check the supply circuit for a short

How is the battery voltage ?

Is the battery over 4 or 5 years old?

Check the tps connector

Check the alternator for a/c ripple

Back probe tps

You have two sides
5v to .02
.02 to 5v
grd
ref 5v

something like that,i don't have
any diagram for your veh

Your so called tune-up is not even in the
area of the problem

The cps is for #1 cylinder recognition,not the issue either

Study-- don't listen to anyone,you have a lot to
remember back on & be proud of.

Your looking for something that would put more than
5v that the pcm outputs,so a voltage spike from somewhere

It is most likely the TPS sensor for the P0123 code(TPS voltage out of range). If P0123 occurs again, repair. The P0162 may be a result of the P0123 failure. So repairing the P0123 may also correct the P0162 fault.


The P0162 appears to be Jeep enginr specific. The following link may be of help.

P0162 DTC For Mitsubishi Jeep

P0123 is a TPS/Pedal Position Sensor A Circuit High Input code. P0162is an 02 Sensor Circuit Malfunctoin (Bank 2 Sensor 3) problem.

DTC P0123 - Throttle Position Sensor/Switch A Circuit High Input
This code means that the the car's computer has detected that the TPS (throttle position sensor) is reporting too high a voltage. Were codes deleted after this job? This is a code for TPS voltage high.

The sensor voltage should never be greater than 5volts. It normally reads .5 to .8 volts at idle (closed throttle). The orange and dark blue is the signal wire, black and light blue is the sensor ground, and the violet and white is the 5volt supply wire. You will need to back probe the signal wire to find the value. It is possible the signal or ground wires are open. Or the PCM is faulty.




Hope this helps (remember to rating this free answer).

A P0123 code means that the 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)

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.

your problem is the crankshaft positioning sensor(CPS) located at the transmission bell house.had the same problem with my 99 jeep sport.the dealer said it was the pcm.but when i replaced the cps never had the recurring problem of engine stalling after 30 mins of driving.

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.
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.
P0152 Oxygen Sensor Circuit High Voltage (Bank 2 Sensor 1)

P0122 - Throttle Position (TP) Sensor Circuit Low Voltage
P0123 - Throttle Position (TP) Sensor Circuit High Voltage
without checking it 1st I would guess the TPS is most likely defective.
P0432 - Catalyst System Low Efficiency Bank 2, you may have to replace the Catalytic convertor, it may be worn out,
A WORD OF CAUTION: Don't use aftermarket cats, they tend to reset the same code due to compatibility issues, also replace the cat monitor sensor (looks like an O2 sensor) located just to the rear of the bank 2 cat converter.