Check Engine Light Codes

This is the forum for technical articles, part numbers, history, and other information about the 1st gen Neon.
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Whodini
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Check Engine Light Codes

Post by Whodini » Sat Feb 24, 2007 8:04 am

11** Intermittent loss of either camshaft or crankshaft position sensor.
11** CKP sensor target windows have too much variation.
11* No crank reference signal detected during engine cranking.
12* Direct battery input to PCM was disconnected within the last 50 Key-on cycles.
13** No difference recognized between the engine MAP reading and the barometric (atmospheric) pressure reading from start-up.
14** MAP sensor input below minimum OR above maximum acceptable voltage.
15** No vehicle speed sensor signal detected during road load conditions.
17* Engine did not reach operating temperature within acceptable limits.
17** Engine does not reach 20°F within 5 minutes with a vehicle speed signal.
21 Oxygen sensor response slower than minimum required switching frequency.
21** O2 sensor voltage too low, tested after cold start.
21** Neither reich or lean condition detected from the downstream oxygen sensor.
21** Oxygen sensor heating element circuit malfunction.
21** Oxygen sensor response slower than minimum required switching frequency.
21** Upstream oxygen sensor heating element circuit malfunction.
21** Oxygen sensor input voltage maintained above the normal operating range.
21** Neither rich or lean condition detected from the oxygen sensor.
22** Engine coolant temperature sensor input below minimum OR above maximum acceptable voltage.
23** Intake air temperature sensor input below the maximum OR above the minimum acceptable voltage.
24** TPS signal does not correlate to MAP sensor.
24** Throttle position sensor input below the minimum OR above the maximum acceptable voltage.
25** Actual idle speed does not equal target idle speed.
25** MAP sensor signal does not correlate to throttle position sensor signal. Possible vacuum leak.
25** A shorted or open condition detected in one or more of the idle air control motor circuits.
27** Injector #1 OR #2 OR #3 OR #4 output driver does not respond properly to the control signal.
31** A small leak has been detected by the leak detection monitor.
31** The leak detection monitor is unable to pressurize Evap system, indicating a large leak.
31** Leak detection pump soleniod circuit fault (open or Short).
31** Leak detection pump switch does not respond to input.
31 A pinched or bent Evap hose.
31** An open or shorted condition detected in the duty cycle purge solenoid circuit.
32** Required change in air/fuel ratio not detected during diagnostic test.
32** An open or shorted condition detected in the EGR transducer solenoid circuit.
33* An open or shorted condition detected in the A/C clutch relay circuit.
34* An open or shorted condition detected in the Speed Control vacuum or vent solenoid circuits.
35** An open or shorted condition detected in the low speed radiator fan relay control circuit.
37** An open or shorted condition detected in the torque converter part throttle unlock solenoid control circuit (3 speed auto RH trans. only).
37** Incorrect input state detected for the Park/Neutral switch, auto. trans. only.
37* Relationship between engine speed and vehicle speed indicates no torque converter clutch engagement (auto. trans. only).
41*** An open or shorted condition detected in the generator field control circuit.
42* An open or shorted condition detected in the auto shutdown relay circuit.
42* An Open condition Detected In The ASD Relay Output Circuit.
42* An open or shorted condition detected in the fuel pump relay control circuit.
42* Open circuit between PCM and fuel gauge sending unit.
42* Circuit shorted to voltage between PCM and fuel gauge sending unit.
42* No movement of fuel level sender detected.
43** Misfire detected in multiple cylinders.(#1 or #2 or #3 or #4)
44** Battery temperature sensor input voltage below OR above an acceptable range.
46*** Battery voltage sense input above target charging voltage during engine operation.
47*** Battery voltage sense input below target charging during engine operation. Also, no significant change detected in battery voltage during active test of generator output circuit.
51** A lean air/fuel mixture has been indicated by an abnormally rich correction factor.
52** A rich air/fuel mixture has been indicated by an abnormally lean correction factor.
53** PCM Internal fault condition detected.
53** PCM Internal fault condition detected.
54** No camshaft signal detected during engine cranking.
55* Completion of fault code display on Check Engine lamp.
61
62* Unsuccessful attempt to update EMR mileage in the PCM EEPROM
63** Unsuccessful attempt to write to an EEPROM location by the PCM.
65* Power steering high pressure seen at high speed (2.5L only).
65** No release of brake switch seen after too many accelerations.
71** 5 volt output from regulator does not meet minimum requirement.
72** Catalyst efficiency below required level.

cycle your ignition key 3 times and on the third time leave it on, then watch the check engine lite for how many times it blinks...for example... if it blinks 5 times with a pause and then blinks 5 more times, this means theres no codes to decifer. if it blinks 2 times with a pause, then it blinks 3 times, thats 23 and would mean Intake air temperature sensor input below the maximum OR above the minimum acceptable voltage. good luck. hope this becomes a sticky.
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~96 Plymouth Neon 2 Door Coupe ~A Little Show & A Little Go~

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98DOHCSport
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Post by 98DOHCSport » Fri Apr 06, 2007 4:16 pm

Thats a complete list. Some aren'tt there in other posts
98 PLAT Sports Coupe(fun)
98 White R/T(funner)
97 DOHC ACR Coupe(funnerest)

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hotrod
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Post by hotrod » Thu Feb 25, 2010 1:18 pm

How do you get rid of a code 12* Direct battery input to PCM was disconnected within the last 50 Key-on cycles.
I'm trying to get my car to pass smog, but the tech said,
the computer is registering no memory, because
I had the battery disconnected, when I stored my vehicle
In my garage.
My Ne0n Project Can Be Found Here
http://teamtos.ca/forum/viewtopic.php?f=31&t=153
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IT'S JUST A NEON L0oL...

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