1996 Saturn SL1 Throttle Postition sensor

Tiny
KRISPY1179
  • MEMBER
  • 1996 SATURN SL1
  • 4 CYL
  • FWD
  • MANUAL
  • 14,000 MILES
MY engine light is on and the Diagnosis code reads the TPS is acting up. So I replaced it (3 times) and the code still hasn't gone away, the car still acts the same (Revs high or low, soemtimes stalls on starting), and the engine light is still on. Some one told me to get a part that is a 21020101 because the aftermarket ones can be junk. All I can find are aftermarket parts (I don't think it is made anymore). The last 3 that I had bought was from autozone, should I try another aftermarket TPS and if so should I go to another store? PLEASE HELP ME MY INSPECTION IS DUE! THANKS A BUNCH!
Do you
have the same problem?
Yes
No
Friday, November 14th, 2008 AT 9:49 AM

4 Replies

Tiny
BMRFIXIT
  • EXPERT
What do you have for codes?
As it may be the wiring and not the sensor
Check ground
Was this
answer
helpful?
Yes
No
Friday, November 14th, 2008 AT 10:03 AM
Tiny
KRISPY1179
  • MEMBER
The code is P0121
Was this
answer
helpful?
Yes
No
Friday, November 14th, 2008 AT 10:09 AM
Tiny
KRISPY1179
  • MEMBER
I went and re-read the code and its p0122. TPS Switch A/ circut low input
Was this
answer
helpful?
Yes
No
Friday, November 14th, 2008 AT 10:44 AM
Tiny
BMRFIXIT
  • EXPERT


http://www.2carpros.com/forum/automotive_pictures/99387_Graphic1_59.jpg



Circuit Description

Throttle Position (TP) sensor is a variable resistor. TP sensor input voltage will be low when throttle blade is closed and increase when throttle is opened.
DTC will set if TP sensor voltage is less than .2 volt with engine running and no other TP sensor DTC(s) have been set. DTC P1122 sets in about .5 second while DTC P0122 takes 3 seconds. TP sensor signal is continuously monitored.

Diagnostic Procedures

1.Connect scan tool. Check if DTC P1635 is also present. If DTC P1635 is present, diagnose this DTC first. If DTC P1635 is not present, go to next step.

2.Using scan tool, monitor TP sensor voltage reading. If TP sensor reads less than .2 volt, go to next step. If TP sensor reads greater than .2 volt, problem is intermittent. See DIAGNOSTIC AIDS.

3.Disconnect TP sensor harness connector. Using a jumper wire, jumper TP sensor harness connector terminals "A" and "C". If TP sensor still reads less than .2 volt, go to next step. If TP sensor reads greater than .2 volt, check tightness of harness connector terminals or faulty TP sensor.

4.Remove jumper wire. Using a test light connected to battery voltage, probe TP sensor harness connector terminal "C". If TP sensor still reads less than .2 volt, go to next step. If TP sensor reads greater than .2 volt, check for open in 5-volt reference signal circuit to TP sensor (terminal "A".)

5.Turn ignition off. Disconnect PCM harness connectors J2 and J3. Check resistance between TP sensor harness connector terminals "B" and "C". If resistance is greater than 2 ohms, go to next step. If resistance is less than 2 ohms, check for shorted circuit between terminals "B" and "C" or circuit shorted to ground.

6.Check continuity of TP sensor signal circuit between PCM and sensor harness connector terminals. Repair as necessary. If circuit is okay, check tightness of harness connector terminals or faulty PCM.

Diagnostic Aids
Use scan tool to review malfunction history diagnostic information. This data can be used to duplicate a problem. Normal voltage readings should vary smoothly from .4 volt to 4.7 volts as throttle is moved from closed to wide open position.
Was this
answer
helpful?
Yes
No
Friday, November 14th, 2008 AT 10:00 PM

Please login or register to post a reply.

Recommended Guides