How-To: Engine Diagnostics

todd 11 · Post by **todd 11** » Tue Mar 13, 2007 10:09 pm

great post

98DOHCSport · Post by **98DOHCSport** » Thu Apr 19, 2007 11:48 pm

hell yeah. This is always needed but never handy, here it is.

pa98sport · Post by **pa98sport** » Tue Jun 19, 2007 7:03 pm

does anyone know what # 36 means

chipdogg · Post by **chipdogg** » Mon Jul 02, 2007 4:31 pm

Means you counted wrong.

Pedro F · Post by **Pedro F** » Mon Jul 02, 2007 4:47 pm

i thought this only worked on 95 non obd2 neons

chipdogg · Post by **chipdogg** » Mon Jul 02, 2007 4:49 pm

Works on all 1st gens.

Pedro F · Post by **Pedro F** » Mon Jul 02, 2007 4:50 pm

very nice

plumcrazy73 · Post by **plumcrazy73** » Sat Oct 06, 2012 9:49 am

there is nothing there! all it says is edit.

northern · Post by **northern** » Sat Oct 06, 2012 3:11 pm

do you need the codes?

95-99 neon OBD-II Codes

Cycle the ignition key on-off-on-off-on within five seconds, don't crank engine, only to get dash lights to respond.

Count the number of times the check engine lamp flashes, pause, and flashes again. First set of flashes is first digit, second digit comes after the pause.

Codes and description of trouble are as follows:

11- Timing belt skipped 1 tooth or more from initial learned value; Intermittent loss of either camshaft or crankshaft position sensor. 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 change in manifold absolute pressure (MAP) from start to run
14- Manifold absolute pressure (MAP) sensor voltage out of range
15- No vehicle speed sensor signal
17- Closed loop temp not reached or engine cold too long
21- 02 sensor problem (oxygen sensor), upstream or downstream
22- Engine coolant temp sensor out of range
23- Intake air temp sensor out of range
24- Throttle position sensor (TPS) out of range, or disagrees with MAP
25- Idle air control motor circuits problem, target idle not reached(+/- 200), vacuum leak found
27- Injector control circuit problem
31- Evaporator purge flow monitor failure or evaporator solenoid circuit problem
32- Exhaust gas recirculating (EGR) system failure or solenoid circuit problem
33- A/C clutch relay circuit problem
34- Speed control solenoid circuits problem
35- Radiator fan control relay circuit problem
37- Torque converter clutch solenoid circuit or park/neutral switch failure
41- Generator field not switching properly
42- Fuel pump relay control circuit problem Auto shutdown (ASD) relay control circuit problem No ASD relay output voltage at PCM Fuel level sending unit - volts out of range Fuel level sending unit - no change over miles
43- Multiple/ single cylinder misfire
44- Battery temp sensor volts out of range
46- Charging system voltage too high
47- Charging system voltage too low
51- Fuel system lean
52- Fuel system rich
53- Internal controller failure
54- No cam signal at PCM
55- End of error messages (If you get this only, no errors were found)
62- PCM failure - SRI mile not stored
63- PCM failure - EEPROM write denied
64- Catalytic converter efficiency failure
65- Power steering switch failure

Post by **racer12306** » Mon Nov 12, 2012 7:48 am

Yeah, lackof got a sandy vag and delete the few useful posts he made.