1991 Cavalier CEL diagnostic

Asked by Feb 28, 2011 at 07:43 PM about the 1991 Chevrolet Cavalier

Question type: Maintenance & Repair

CEL is always on, and car will drive a few miles then die, how do I get the CEL into diagnostic mode? I know I will need to jumper something, and then count the flashes, but I don't know where or what to jumper. Also, is there a list of the codes on here somewhere?

1 Answer

11,845

Find the diagnostic connector below the dash and cross terminals A and B CODE 13 Indicates that the oxygen sensor circuit CODE 14 Sets if the sensor or signal line are Coolant Sensor (CTS) grounded for 3 seconds. CODE 15 Sets if the sensor, wires, or connections Coolant Sensor (CTS) are open for 3 seconds. LOW Temperature indication CODE 21 TPS voltage of more than 2.5 volts for Throttle Position Sensor (TPS) 3 seconds at an engine speed less than 1200 rpm. HIGH Voltage Signal CODE 22 A shorted to ground or open signal circuit Throttle Position Sensor (TPS) will set code in 3 seconds. LOW Voltage Signal CODE 23 Sets if the sensor, wires, or connections Manifold Air Temperature Sensor (MAT) are open for 3 seconds. or Intake Air Temperature (IAT) LOW Temperature indication CODE 24 No vehicle speed present during road Vehicle Speed Sensor (VSS) load deceleration. NO Vehicle Speed Indication CODE 25 Sets if the sensor or signal line are Manifold Air Temperature Sensor (MAT) grounded for 3 seconds. or Intake Air Temperature (IAT) HIGH Temperature indication CODE 32 Vacuum switch shorted to ground on start up Exhaust Gas Recirculation (EGR) OR Switch not closed after the ECM has commanded EGR for a specified period of time. OR EGR solenoid circuit open for a specified period of time. CODE 33 MAP sensor output too high for 5 seconds Manifold Absolute Pressure (MAP) or an open circuit. LOW Vacuum CODE 34 Low or no output from sensor with engine running. Manifold Absolute Pressure (MAP) HIGH Vacuum CODE 35 IAC error. Idle Air Control (IAC) CODE 42 ECM has seen an open or grounded EST or Bypass circuit. electronic Spark Timing (EST) CODE 43 Signal to the ECM has remained low for too long Electronic Spark Control (ESC) or the system has failed a functional check. CODE 44 If voltage to oxygen sensor remains BELOW .2v LEAN Exhaust Indication. for more than 20 seconds, code is set. CODE 45 If voltage to oxygen sensor remains ABOVE .7v RICH Exhaust Indication. for more than 1 minute, code is set. CODE 51 Faulty MEM-CAL, PROM, or ECM. CODE 52 Faulty or missing CAL-PACK. CODE 53 System overvoltage. Indication of a faulty alternator or regulator. Camaro/Firebird uses a Code 53 for Vehicle Anti-Theft System (VATS). CODE 54 Sets when the fuel pump voltage is less than LOW Voltage To Fuel Pump. 2 volts when reference pulses are being received. CODE 55 Faulty ECM.

6 of 6 people found this helpful.

Your Answer

Add photo

Related Questions

  • Serious ducks diagnostic problem 2000 Cavalier 2.2L 3 answers

    OK. 2000 Cavalier w/ 90000 miles. Low reservoir light came on... ended up replacing thermostat. Had HUGE ISSUES bleeding it & actually put 112 miles on it before it overheated AGAIN. Also have new ...

    Chevrolet Cavalier

    -

    Maintenance & Repair

  • 03 chevy cavalier 6 answers

    My 03 cavalier check engine light is can't be erased even though if already fix the problem any suggestions on what can be worng

    2003 Chevrolet Cavalier Base

    -

    Maintenance & Repair

  • What causes an 02 Cavalier trac off light to show up on the dashboard? The car also does not shift right. 14 answers

    2002 Chevy Cavalier problems with the trac off light on and the car is not shifting right.

    2002 Chevrolet Cavalier LS Sport

    -

    Maintenance & Repair

  • 2002 Chevy Cavalier won't Start 3 answers

    Ok, this is getting frustrating. My daughter's 2002 Chevy Cavalier died and won't start again. She was backing out of a driveway and it died. Now she says the Anti-Theft light WAS on when it died, but...

    2002 Chevrolet Cavalier Base

    -

    Maintenance & Repair

  • CEL on for no apparent reason 3 answers

    I have an 04 MIT. Montero. The CEL is on. I've changed the oil, plugs, timing belt. Had it turned off 3 times. What in the world else? No diagnostics come up either. Is this an o2 sensors?

    2004 Mitsubishi Montero Limited 4WD

    -

    Maintenance & Repair

Search Chevrolet Cavalier Questions

Chevrolet Cavalier Experts

#1 John Saffrahn
John Saffrahn
Reputation 2,920
#2 dandyoun
dandyoun
Reputation 1,300
#3 mbar1
mbar1
Reputation 1,180
View All

Related Models For Sale

Used Honda Civic
654 Great Deals out of 88,603 listings starting at $995
Used Chevrolet Camaro
226 Great Deals out of 30,943 listings starting at $1,217
Used Ford Mustang
474 Great Deals out of 45,735 listings starting at $1,999
Used Toyota Corolla
786 Great Deals out of 73,830 listings starting at $1,995
Used Honda Accord
812 Great Deals out of 84,287 listings starting at $1,050
Used Chevrolet Corvette
119 Great Deals out of 20,753 listings starting at $3,000
Used Ford Taurus
249 Great Deals out of 20,434 listings starting at $699
Used Pontiac Grand Prix
30 Great Deals out of 2,871 listings starting at $900

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.