Question about 1993 Chevrolet S-10

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1993 s10 2.5L the aldl not responding and code reader says module not responding

Truck wont hardly idle ses light comes in and out or dim and shift light goes in and out to all the time sometimes. so trying check codes and tried snap on scanner and the jumper wire way doesnt do a thing

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1 Answer

Now you need a wiring diagram & work your way back on all
of the ALDL Pins or wires, to see if their good end to end

Then you need to see what data some of them are supposed
to have at the connector.

21 years -- most likely some corrosion in the wiring, where somewhat exposed to the road,engine bay, etc

The ses light,idle,& such are another issue to work on.

I think the codes, if any, are less help than component testing
the vehicle sensors & wiring

The OBD1 Systems had common sensor wiring or grounds shared,
so grounds & failed sensors can effect other sensors & send
you all sorts of places, rather than walking down every wire with
a wiring diagram to see what's what

Posted on Mar 19, 2014

  • jarrett
    jarrett Mar 20, 2014

    so i checked wires and went to ecm and unplugged and checked every pin and even took apart and checked connection on prom and all. everything looks clean and fine put all back together and tried to check codes again and see what truck would do. well no flashing light yet but i jumped terminals now and it flashed but it looked like more of continous flash not sure if paused but was running better and noticed when grounded the b pin on dlc like should the idle would change seem to get worse its wierd

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SOURCE: 91 S10 rough idle, stalling ALDL problems

Make sure there is no vacuum leaks.


Vacuum leak at intake manifold and vacuum hose.

Bad Idle Air Control Motor (IAC)

Low compression (170 psi + is OK)

Start cleaning and repair these trouble spots and see is there any improvement.

====

For more advance DIY'er then you may try this.

Use a can of Berryman carburetor clean to locate the vacuum leak.


SEE SAMPLE PICTURE HERE


This is a 20-30 minutes job.

Vacuum leaks can occur in following locations.


Intake manifold AND/OR vacuum lines.


Intake manifold is not accessible unless the engine head if off.

You can still check the potential leak by spraying some Berryman near the intake manifold.

Listen for rpm increase after you introduce the Berryman (FUEL) at idle.


Do the same starting from the brake booster unit (the round unit) on the drive side fire all.

Carefully listen for increase of RPM right after to spray the Berryman to the potential vacuum spot.

Get a friend to HEAR the RPM increase or monitor for RPM on the tech.

DO NOT AIM the Berryman into any heat source.


PLEASE RATE my answer if it is useful to you.

Posted on Dec 17, 2009

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SOURCE: WHY CAN'T I GET ANY CODES ON MY 1994 3.4 CAMARO

The only way those type of scanners will give you a code is if it is a hard code. When a check engine light is on, but doen's flash it is usually referring to an emission problem. A flashing light refers to misfire. Spark plugs, wire, etc. A snap on scanner or Genesis Scanner is able to look at perimeters inside the system which is a better approach when you don't have a hard code. Sometimes after the code is on long enough it will become a hard code and the type of scanner that you have will pull it. The thing that often happens is the EGR isn't circulating properly and you get an intermediate light and don't get a hard code for a while which leaves you in the dark. You might take your vehicle to a local service shop which uses a better scanner and they can look at what is going on and solve that problem.

Posted on Mar 07, 2010

Testimonial: "You are correct. However I'm not enen getting the code 12 that the system is working. I think my computer might be fried? "

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2 Answers

Ran it out of gas, now runs fine cold, as soon as its warm starts hard, and stalls when put in drive


Is the \'Service Engine Soon\' light on? Only from what you described, it sounds like the engine\'s running in \'open loop\' (fast idle, cold) okay, then when it\'s supposed to go into \'closed loop\', you have a malfunction. Checking the trouble codes will pinpoint the problem; your truck is pre-\'95 so it\'s the older OBD-I and you could get the trouble codes by grounding the proper terminal in the ALDL, counting the blinks of the SES light and using it to determine what electronic control device is malfunctioning. If no SES light/trouble codes and since you ran out of gas (?), it might be time to replace the fuel filter and possibly check the fuel pressure and/or fuel pump.

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What make take off in 2nd and shift to 3 just them 2 gears . 1st and 4 wont shift


Sounds like the transmission control module (TCM) is not responding to vehicle speed sensors input or speed sensors are defective. One maybe but two sensors not likely). Take the vehicle to transmission repair shop and have them scan TCM for codes then take it from there.

Apr 30, 2010 | 1993 Honda Accord

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Code reader does not work


with a test light test the ALDL plug for battery power the pin right next to it willl be ground. ( hook the test light to power and a ground will light the light) the check engine light should come on and if you crossthe upper two pins in the aldl the check engine light should flash out the codes. The code reader might not be working and may need to hook it to a different car and see if it reads a different car.

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SES light on after gear selection


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The easiest way to determine what your engine is complaining about would be to take the car to an auto store or a mechanic and have them scan the diagnostic module for you (or you can do this yourself if you happen to have a code reader/clearer unit)
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99 Saturn SC1 ''Service engine soon'' light is on.


Did you get the code that triggered the SEL? If you know that, it will be easier to diagnose your problem. You can do it without a tool on the old saturns. Just need a paperclip. :

Use a paper clip to jumper Terminal A and B of the ALDL *Assembly Line Diagnostic Link* which is above your left knee.
Terminal A is an interal ground and is the top right terminal in the connector. Terminal B is directly adjacent and to the left of Terminal A.

Turn the ignition to ON.

All codes are 2 digits between 11 and 99. Codes are displayed on the SES light by flashing the light with short and long pauses to distinguish digits of one code from digits of another. The short pause is used between digits of the same code, long pauses are between codes. Also, each code is flashed three times before going to the next code.

For example, the sequence of code 12 will be: flash, pause, flash-flash, long pause, then repeat 2 times. If Code 12 is not displayed, the self-diagnostic pogram i snot functioning properly.

If only Code 12 is displayed, no system malfunctions have been stored.

Any existing system fault codes are displayed in order from low to high, except for Code 11.

On vehicles with an automatic transaxle and on which exist stored transaxle codes, Code 11 will be displayed last, then the SHIFT TO D2 light will begin flashing transaxle codes of flags.

When all engine codes have been displayed, Code 12 will flash again.

Diagnostic Codes
11. Transaxle Codes present
12. Diagnostic System Check
13. Oxygen sensor, circuit open or not ready
14. CTS circuit, out of range high
15. CTS circuit, out of range low
17. PCM fault, pullup resistor
19. 6x signal fault, no 6x signal between reference pulses
21. TPS circuit, out of range high
22. TPS circuit, out of range low
23. ATS circuit, out range low
24. VSS circuit, no signal
25. ATS circuit, out or range high
26. Quad Driver output fault
32. EGR system fault
33. MAP sensor circuit, out of range high
34. MAP sensor circuit, out of range low
35. IAC valve, rpm out of range
41A EST circuit open
41B EST circuit shorted
42A Bypass circuit grounded
42B Bypass circuit open
42C Bypass circuit shorted
41. EST bypass, open or shorted
42. EST bypass, open or shorted
43. ECS (knock sensor) circuit open or shorted
44. Oxygen sensor indicates system lean
45. Oxygen sensor indicates system rich
46. Power steering pressure switch circuit, open
49. Idle rpm out of limit high (vacuum leak)
51. PCM memory error
55. A/D converter error in PCM
81. ABS message fault (1993 vehicles with TCS)
82 PCM internal communication fault


Diagnostic Flags
27. Quick quad driver output fault (1993 only)
48. Reference imput intermittent or noisy
52. Battery voltage out of range
53. ESC knock present
54. Five volt reference ground
58. Battery voltage unstable
61. 6x signal fault
63. Option check sum error
67. Handwheel sensor circuit fault
71. Cooling system temperature high
72. Coolinng system temeprature low
73. CTS sensor unstable
74. CTS/transaxle temperatuer sensor ratio error
76. ATS sensor unstable
83. Low coolant (1993 only)

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Trouble codes for 1993 Dodge Daytona with 3.0 liter


CODE 12
Trouble Code 12 is a special case code that is not logged into the ECM's Non-Volatile Memory (NVM) when detected. When the ignition is "ON" and the ECM detects no ignition reference pulses coming from the ignition module, it illuminates the Service Engine Soon lamp.
CODE 22
Trouble Code 22 indicates that the Throttle Position Sensor (TPS) is reading abnormally low. TPS volts should be close to 0.42 V at closed throttle and rise smoothly in about 0.02 volt increments to a maximum reading of about 4.85 volts at WOT
CODE 35
Trouble Code 35 is not used in the Turbo cars. If this code appears while a computer is connected to the ALDL connector, it is probably the result of a bad cable connection at the PC or the ALDL connector. Reseat the cable connections.

Aug 24, 2008 | 1993 Dodge Daytona

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