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I have been working on a hard/impossible to start issue with my 92 JDM FD in the last couple weeks. Since I wanted to do some maintenance and look over the whole car anyways I didnt worry about fixing the issue until after that work was done.
So i put in a new fuel pump, fuel filter, redid the rats next, new plugs, new wires, etc.... That work has been completed now and Im troubleshooting the hard/impossible to start problem. I tried to check the codes last night but all I am getting is a solid MIL. By that I mean when i turn the ignition to the on position it illuminates the LED for a few seconds, then the led goes out for a few seconds then comes on and stays on. I think this means I have an issue with the ECU but have not been able to find any documentation to support this. Anyone know what a solid MIL means? |
jdm car you need the code checker?
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Nope, just need a 12v led and a 680 ohm resistor to get the codes.
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i thought the CEL light stayed on until the car was started, UNLESS there were codes to be displayed.. Or has it just been that damned long since i've driven mine??
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I check the operation of the LED on another 92 FD at the shop and it lit the led for a few seconds, then it went off and did not come back on. This makes me believe that a constant MIL means the ecu i toast but i cant find it in the FSM or on any of the rotary forums.
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So far everyone ive talked to has never seen this before. Im going to try my ecu on another FD to see if it gives the same solid MIL. If it does work i guess ill be testing wiring between the ecu and all the sensors :(
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Originally Posted by kevjs' post='876479' date='Jun 28 2007, 09:32 AM
So far everyone ive talked to has never seen this before. Im going to try my ecu on another FD to see if it gives the same solid MIL. If it does work i guess ill be testing wiring between the ecu and all the sensors :( yeah if its solid its not good |
I tried my ECU on an FD at the shop and it displayed a solid MIL, so it looks like my ECU is toast. Now I need to find out if there is a problem with the wiring on the car that damaged the ecu or not. I would try the working ECU off the car in the shop on my FD but dont want to buy two new ECU's :(
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i thought the CEL light stayed on until the car was started, UNLESS there were codes to be displayed.. Or has it just been that damned long since i've driven mine?? From what I have seen on the working FD at the shop the MIL (Led ive put in the diagnostic box) lights up for about 3 seconds when the ignition is turned on but goes out and does not come back on. Im not sure if the USDM FD's are different or not. |
Originally Posted by kevjs' post='876754' date='Jul 1 2007, 11:10 PM
From what I have seen on the working FD at the shop the MIL (Led ive put in the diagnostic box) lights up for about 3 seconds when the ignition is turned on but goes out and does not come back on. Im not sure if the USDM FD's are different or not.
Can anyone confirm this? JDM or USDM or both? |
To continue troubleshooting this before plugging in a new stock ecu or power fc I would like to verify the values on all wires running to the ecu. Where can i get a test harness for the ecu, one that allows the ecu to be connected to the connectors but has another set of connectors i can use with a probe? Similar to a harness used for piggy back setups but with the extra set of connectors.
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Originally Posted by kevjs' post='876754' date='Jul 1 2007, 10:10 PM
From what I have seen on the working FD at the shop the MIL (Led ive put in the diagnostic box) lights up for about 3 seconds when the ignition is turned on but goes out and does not come back on. Im not sure if the USDM FD's are different or not.
when you jump "ten" and "gnd" on a us car, and turn the key on. the check engine light turns on for 3 seconds, and then it flashes the code(s). afik, when you look at the signal with a voltmeter, its opposite. the voltmeter is on and then turns off for the codes |
Originally Posted by j9fd3s' post='876860' date='Jul 2 2007, 08:09 PM
when you jump "ten" and "gnd" on a us car, and turn the key on. the check engine light turns on for 3 seconds, and then it flashes the code(s).
afik, when you look at the signal with a voltmeter, its opposite. the voltmeter is on and then turns off for the codes Ok, but if it has no codes to display the light goes out after 3 seconds and stays out? |
Originally Posted by kevjs' post='876870' date='Jul 2 2007, 08:17 PM
Ok, but if it has no codes to display the light goes out after 3 seconds and stays out?
yes |
I have now received a 93 USDM ecu and no longer get the solid MIL. Now i have codes 28 (EGR which i dont have) and 39 (releif 2 solenoid) to deal with.
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