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86-95 Trucks & 4Runners 2nd/3rd gen pickups, and 1st/2nd gen 4Runners with IFS

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Old 03-29-2009, 03:31 PM   #1
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Flashing engine light codes?

What does the flashing check engine light mean when the T1 and E1 terminals are jumped? I kept getting a looped code of flashing a few times. What do these mean?
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Old 03-29-2009, 04:06 PM   #2
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Depends what code it's outputting. Count how many times it blinks in between pauses. I'm just going by memory here, so hopefully somebody can confirm, but I think it pauses 1 second between the two digits of each code, and it will pause 2 seconds between each code (if there is more than one). Do a search for OBD I codes on here, and you should find enough info to help you out.

To get you started, here's what a quick google search yielded.
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Old 03-29-2009, 04:22 PM   #3
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I read over the link(s) and did a search. Couldn't find any information on how to read the flashing light codes. That codes in that link above don't really match the codes I read, but that's why I'm trying to figure out how to "read" them. The engine light flashes twice, pauses, then 3 (maybe 4?) times, then pauses again and flashes 2 times, and keeps going in this loop.
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Old 03-29-2009, 04:39 PM   #4
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Sounds like a Code 24, Intake Air Temperature Sensor (THA) Signal.
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Old 03-30-2009, 07:15 AM   #5
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It's hard to describe it in words... can you post a video of the CEL when you jumper it?

If you can't, then be more descriptive in what you're seeing. There are two digits for each code, and as long as your jumper is in and the ignition is on, the code "loop" will just repeat itself, whether there is only one code in memory, or multiple codes.

As an example, if it goes 2 blinks, short pause, 4 blinks, long pause, 2 blinks, short pause, 4 blinks, long pause... and just keeps repeating this cycle, then you only have one code (a code 24).

Another example, if it goes 2 blinks, short pause, 4 blinks, medium pause, 3 blinks, short pause, 1 blink, long pause, 2 blinks, short pause, 4 blinks, medium pause, 3 blinks, short pause, 1 blink, long pause... and just keeps repeating this cycle, then you have two codes (a code 24, and a code 31).

Bottom line is there is a short blink between digits, a medium blink between different codes, and a long blink at the end of all the codes, before the loop starts over again. I don't know the exact lengths of the pauses, but I think they are: short = 1 second, Medium = 2 seconds, Long = 4 seconds.
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Old 03-30-2009, 07:33 AM   #6
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It's hard to describe it in words... can you post a video of the CEL when you jumper it?

If you can't, then be more descriptive in what you're seeing. There are two digits for each code, and as long as your jumper is in and the ignition is on, the code "loop" will just repeat itself, whether there is only one code in memory, or multiple codes.

As an example, if it goes 2 blinks, short pause, 4 blinks, long pause, 2 blinks, short pause, 4 blinks, long pause... and just keeps repeating this cycle, then you only have one code (a code 24).

Another example, if it goes 2 blinks, short pause, 4 blinks, medium pause, 3 blinks, short pause, 1 blink, long pause, 2 blinks, short pause, 4 blinks, medium pause, 3 blinks, short pause, 1 blink, long pause... and just keeps repeating this cycle, then you have two codes (a code 24, and a code 31).

Bottom line is there is a short blink between digits, a medium blink between different codes, and a long blink at the end of all the codes, before the loop starts over again. I don't know the exact lengths of the pauses, but I think they are: short = 1 second, Medium = 2 seconds, Long = 4 seconds.
Yeah, I'll get HD video of it and post it up.
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Old 03-30-2009, 02:41 PM   #7
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just count the flashes grouped in between the pauses and post what you got

for instance: 2-5--4-1--5-1----
(two flashes, short pause, five flashes, long pause, four flashes...)

that would be 21,41, and 51

there is a very long pause before the cycle starts over again

here is a link that may help


Diagnostic Trouble Codes - 1989
Toyota
11 ECU Power Supply.
12 Engine RPM Signal.
13 Engine RPM Signal.
14 Ignition Signal.
21 Oxygen Sensor (OS) Signal.
22 Water Temperature Sensor (THW) Signal.
24 Intake Air Temperature Sensor (THA) Signal.
25 Air/Fuel ratio lean.
26 Air/Fuel ratio rich.
27 Sub-oxygen sensor signal.
31 Air Flow Meter Signal.
32 Air Flow Meter Signal.
41 Throttle Position Sensor (TPS).
42 Vehicle Speed Sensor (VSS) Signal.
43 Starter Circuit Signal.
51 Switch Condition Signal.
71 EGR system malfunction.
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Old 03-31-2009, 01:21 PM   #8
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Here's the video. Shot in the darkest corner of the parking garage. Sorry, I was timing the engine.

YouTube Video
ERROR: If you can see this, then YouTube is down or you don't have Flash installed.


These are the codes I pulled. Am I correct: 21, 22, 24, 31, and 21 (loop again.)

These are totally different codes than I received the other day. The other day it seemed to only be 24. Now the water temp sensor can't be bad. I just replaced it a week ago.

By the way. Way off topic, but how do you embed videos on these forums? All of the code I edit doesn't seem to work.
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Old 03-31-2009, 01:25 PM   #9
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21,22,24,31

also, if you unplug the battery for a minute or unplug the EFI fuse (behind DS kick panel), the codes will be cleared from the ECU ... some codes could be old
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Old 03-31-2009, 01:31 PM   #10
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Water temp sensor is not refering to the sensor for the gauge. There are several water temp sensors
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Old 03-31-2009, 01:47 PM   #11
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Water temp sensor is not refering to the sensor for the gauge. There are several water temp sensors
I replaced the one in the front of the throttle body by the cold start injector. This was the actual sensor for the computer, not the gauge (from what I understood searching old threads)
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Old 08-29-2009, 09:03 PM   #12
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I finally got the intake leak fixed. Now I'm finally onto fixing the rest of the problems.

I'm testing the TPS cables and connectors tomorrow. But I'm now getting codes 12, 41, and 71. I'm not worried about 41 and 71 right now, but code 12; I'm reading code 12 is "RPM signal". But what the heck is that? I've been searching the forums and Google and cannot find the cause of a code 12.

I've tried resetting the ECU by removing the EFI fuse. No joy.
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Old 08-30-2009, 03:22 PM   #13
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could the RPM signal be related to the post I made here: http://www.yotatech.com/f116/22re-di...-wires-163570/
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Old 08-31-2009, 12:21 PM   #14
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*bump* anyone? Been googling all morning. Can't figure out what the RPM signal code is caused by.
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Old 08-31-2009, 12:45 PM   #15
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The flow chart for codes is in the FSM.
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Old 08-31-2009, 03:16 PM   #16
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The flow chart for codes is in the FSM.
Thanks for the lead. I found the info and the FSM says it's caused by an open or a short in the STA or NE circuit (another unlikely cause is the distributor)

Is testing the STA and NE circuits the same as the TPS circuit instructions on 4crawler's site: http://www.4crawler.com/4x4/CheapTricks/TPS/index.shtml ?
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Old 09-01-2009, 01:25 PM   #17
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aside from the info above, I also tested the connectors at the end of the TPS cable and I got some good closed circuits. Didnt write down the results because I didnt have a pen and it was just a quick test.

Now to test the circuits at the ECU. I'm hoping my ECU isnt bad. Can anyone provide some more info on testing the NE and STA terminals for the RPM signal code?
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Old 09-01-2009, 01:25 PM
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