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Be advised that the MIL or CHECK ENGINE light can only perform a limited number of functions and it is a good idea to have the system checked with a scan tool to double check the circuit function.
Within a period of 5 seconds, cycle the ignition key ON - OFF - ON - OFF - ON .
Count the number of times the MIL (check engine lamp) on the instrument panel flashes on and off.
The number of flashes represents the trouble code. There is a short pause between the flashes representing the 1st and 2nd digits of the code. Longer pauses are used to separate individual 2-digit trouble codes.
An example of a flashed DTC is as follows:
Lamp flashes 4 times, pauses, then flashes 6 more times. This denotes a DTC number 46.Lamp flashes 5 times, pauses, then flashes 5 more times. This indicates a DTC number 55. DTC 55 will always be the last code to be displayed.
Here is a tip for retrieving Diagnostic Trouble Codes (DTCs) from any OBD1 GM vehicle. <br /><br />First thing is your going to need to get a paper clip, and bend it into a U shape. <br /><br />Now stick the ends of the paper clip into the 2 top right hand side holes in the connector. Note: Do this with the key in the run position, but with the engine off.<br /><br />You should now see your check engine light flash once, pause, then 2 times. This indicates that your ECM is working properly.<br /><br />Now it will blink indicating your code. For example an EGR failure code is DTC 32. You will see your light blink 3 times, pause, then blink 2 times, giving you code 32.<br /><br />A list of codes can be found here: http://www.gmtuners.com/OBD1_DTC.htm.<br /><br />Hopefully this helps some of you all out there. Thanks for looking.
Well, that's the check engine light I think. It is saying something is not normal. You can read out a trouble code to give you an idea of why it is on. Turn the ignition on, but engine stopped, and with a piece of wire bridge terminals TE1 and E1 in the service terminal box, at one rear corner of the engine compartment.
The check engine light will then blink. A steady blink 4 times per sec is "all normal".
Trouble codes are 2 digits, and these will be blinked - first digit - pause - second digit - repreat.
So the oxygen sensor fail code (a common one) is 21, and will show 2 blinks - pause - 1 blink - repeat.
I would check for fuel,(pressure and injector pulse), spark, and compression, before checking any codes. Lack of any of these basics can result in codes, and then you waste alot of time chasing a symptom, instead of the actual problem.If more people followed basic diagnostics, which always come back to these three basics, rather than chasing codes first,they would find no starts much more quickly.
The 95 Caravan is great for giving you trouble codes. However they are two digit codes. There should be a blink sequence followed by a short pause then another blink sequence (example 2 blinks, short pause, 3 blinks... Then 5 blinks, pause, 5 blinks which means no more codes. Turn key from off to run three times and leave in run and watch check engine light to count blinks. Disconnecting negative terminal on battery for 30 seconds clears codes.
Does this light blink at all ? count the blinks. Sometimes it will blink three times, then pause then blink twice etc. Some variation of that? blinks once, then pause then twice. The first example is code 32, the second is code 12. These codes are in my manual, but you have to count them for me. Oh, by the way, is this a celica with the 2.2L 5sfe engine?
There is a diagnostic box under the hood on the passenger side. Its small and it has diagnostics written on the lid. Open the lid and look at the bottom of the lid. Find the two junctions that are labled Tc and E1. Add a jumper wire in between the two ports and look at the check engine light. Count how many times it blinks. Example, in order to get a code 31 the light will blink three times, short pause and then blink once. there will be a little bit longer of a pause between codes and a very long pause after all codes are done. Then you have your codes to try to find out what the problem is. After that you can go to the fuse box under the hood and locate the EFI fuse. Remove the fuse for about 30 seconds and install it back in. This will eliminate the check engine light.
First you need to find out what the fault code is that is making the check engine light come on. To do this, locate the diagnostic connector under the hood. It will be a black rectangular connector approx 50mm X 25mm with Diagnostic written on the cover. Open the cover and on the inside of the cover will be a diagram of the connections and their different labels. Locate pins labelled TE1 and E1. Switch on the ignition switch without starting the engine and with a small jumper wire bridge between pin TE1 and pin E1. Observe the check engine light on the dash and you will notice that it will be flashing. Read the diagnosis code as indicated by the number of flashes that this light makes. Each code will be displayed by first blinking the first digit of the code, then a pause and blink the second digit of the code. For example, Code 52 (knock sensor signal) will flash 5 times, pause and then flash 2 times, then a longer pause before it goes onto the next fault code if there is another one. Once it has gone through all the stored fault codes it will go through the sequence again starting at the first fault code again. Due to the many different fault codes that can be obtained it would be better to post another question for the fault code obtained. Good luck!
FIRST YOU TURN IGNITION SWITCH ON WITH ENGINE OFF.LOOK AT MIL LIGHT IT SHOULD COME ON 3 SECONDS THEN GO OFF IT NOT THEN YOU GOT BURN OUT BULB OR A CIRCUIT PROBLEM.IF ALL IS WELL. ATTEMPT TO START ENGINE.TURN OFF IGNITION. WITH OUT STARTING ENGINE.TURN IGNITION ON OFF ON OFF AND WITHIN 5 SECONDS RECORD 2 DIGIT DIAGNOSTIC TROUBLE CODES.DISPLAYED BY FLASHING MIL LIGHT.YOUR MIL FLASHES WILL BE YOUR CODE LIKE THE MIL LIGHT FLASHES 5 TIMES THEN PAUSE FLASHES 3 TIMES THAT CODE 53 THAT YOUR CODE.IT LIKE MORSE CODE.WHEN DONE TURN OFF IGNITION SWITCH.GO TO AUTO ZONE OR ADVANCE AUTO GET HAYNES COMPUTER CODE BOOK. TO GET CODE MEANING OR WHAT SENSOR GONE BAD.HOPE THIS CAN BE SOME HELP.