Frank van Rouendal

Hi Cameron, Thanks for your info. and advice. I see a signal as per attached picture. Roughly 40 Hz, between 14.0 and 14.5 Volt. This does not bring the ISC into action. - Wires are OK (measuring ISC-C against ground, with 1 kOhm resistor between 12 Volt and ISC-C). - TPS set-up is OK (reads 10 during idling, 100 at full throttle). - Idle settings 60 hot, 70 cold. Engine idles at 900-1000 rpm after warming up (mechanically set by means of adjusting ISC actuator on ISC valve body). At the moment I think that the ECU does not generate the correct signal for this type of ISC. But as the car is scheduled for rolling road dynamometer tests soon, I will leave it as it is. With regards, Frank van Rouendal

Hi Simon, There is a sub-board, but the chip reads "SUBH6D 110504", see attached picture. Do the two switches on the side of the sub-board have anything to do with this? With regards, Frank van Rouendal

Extra upload of screen-101.jpg Frank

Hi Cameron, Thanks for the info. Installed a 1 kOhm resistor between ISC-C and 12V at ISC side, and put the signal on the scope (screen-101.jpg). No result. Added 1 kOhm to the first, then another 1 kOhm, reducing the resitance to 500 Ohm / 330 Ohm. Same picture on the scope, no result. Took all resistors out, same picture, no results. Incidently, the 12V supply to ISC shows the same kind of picture on the scope (screen-104.jpg). I see no useful 12V - 0V square wave signal at ISC-C. Hope you can understand what the problem is. With regards, Frank van Rouendal

Hi Cameron, Thanks for your advice. Connected the ISC as indicated in the picture, but still no results. PCLink screen correctly indicates "increasing idle" or "decreasing idle" depending on IS-setting and actual RPM, but no reaction from ISC. 1. Tested wiring between ECU and ISC connector, both ISC-O and ISC-C are OK. 2. Checked for voltage between ISC control wires and earth during idling, this stays zero. 3. Checked for variation in resistance between ISC control wires and earth during idling, this stays at infinite. 4. Tried to catch signals from ISC control wires on the scope during idling, but not more than 20 mV (constant) through all idling phases. Some noise, showing as spikes. At all tests throttle position was 10 = closed. Please indicate what type and level of signal I should read on ISC control wire(s), so I can check whether ECU is not sending or ISC is not receiving. Engine idles fine on mechanical adjustment of ISC actuator on ISC body, but this depends on engine temperature, and is not controlled by ECU. Hope you know how to solve this. With regards, Frank van Rouendal

Hello Cameron, Thanks for your advice. I did following tests: - Started engine with ISC connected to ECU and IS-setting 1250 rpm: engine stalls unless throttle is opened. - Started engine with ISC disconnected: engine idles at approx. 1500 rpm with throttle closed. - With engine running, throttle closed and +12 V connected to middle pin of ISC, grounded right pin: engine slows down temporarily to approx. 1000 rpm, returns to 1500 rpm after 0.5 sec. - With engine running, throttle closed and +12 V connected to middle pin of ISC, grounded left pin: engine remains at 1500 rpm. - With engine running and throttle closed, connected ISC to ECU again: engine stalls. This mystifies me quite a bit. What would you make of this? I do not understand what you mean by the frequency I am running the ISC at. Cannot find this in the manual. Please explain. Hope you know the answers. With regards, Frank van Rouendal

Hello Jurgen, Thanks for the info. My ISC looks like the last picture, with 3-pins. I have some trouble understanding the pin connections, as I have TWO control wires coming from the ECU: ISC-O and ISC-C. This contradicts the pin assignment in the picture, showing 12 V+, ground and ONE control wire. In the meantime, I did a test with the engine running and setting the speed by throttle. With the ISC connected to the ECU and going through the idle speed range, I noticed that the ISC valve did make some small movements. So I asume that the basic connection is OK, maybe I need to switch ISC-O and ISC-C connections. Now I will study all ISC setting details in the manual, and try to set my ECU correctly. Any advice from you in this matter is welcome. With regards, Frank van Rouendal

Hello Jason, Thanks for your information. I had checked the tech. drawings before, but these give no clue about exact pin arrangement. I hope Link knows this. I doubt that my AFR is wrong, as the engine runs fine, only doesn't idle. Besides, I will check movement of ISC during running, by connecting a separate ISC to the loom, and changing idle speed setting in the program. Hope this will give me more understanding of what is wrong. With regards, Frank van Rouendal

Hi, I have a G1V14 on a Subaru 3 liter engine. Engine is running fine now (see earlier discussion "Syn/Cyl Ratio"), but the ISC does not react to the ECU. ISC is 3-pin, see picture. The part number is 22650AA21B, a.k.a. 22650AA211. I tried +12V on centre pin and ISC 1/2 control on the other pins, but no result. Any idea about the correct pin arrangement? Frank van Rouendal

Hello Simon, Funny: in my screen, Sync/Cyl ratio is still set to 6. More important, voltage of crank trigger signal was too low for ECU. See attachment "screen 041.jpg" at my reply dt. 01-10-2010. After finding out, I moved the sensor nearer to the crank, and got much higher voltage, see present attachment. After this modification engine started normally. Sync/Cyl error shows 0 or 1 at each start, which is normal. Also ignition and injection output signals look good on the scope. I'm glad to have solved the problem. Thanks for your co-operation. With kind regards, Frank van Rouendal

Hi Simon, With triggers swapped I see no errors, but I think this is due to the fact that no useful signals are received by the ECU at all. No indication of RPM on PC Link screen, but from the scope I calculate approx. 175 RPM during starting. Swapped back the triggers, as it seems not logic to foul the ECU. Resulting signals as per attached picture. I have hooked up a second separate battery for the starter motor, to keep voltage at ECU in the correct range, and to continue cranking longer than possible with the racing battery. Now voltage at ECU does not drop below 11.5 V, but still no results. Rising number of Sync/Cyl Errors still noted. Also I noted green and red LEDs on ECU steady after switching on, but red LED blinks about 5-6 times during each start attempt; not during whole start attempt. Does this indicate something? Can you confirm settings are OK (see attachment to Post dt. 18-09-2010)? With kind regards, Frank van Rouendal

Hello Simon, Noting that Sync/Cyl Error keeps adding up during start attempts, I have changed over the crank and cam trigger signals at the ECU input. This results in no more Sync/Cyl Error counts (!). However, still no starts. The injection signal shows no activity on the scope, so the ECU is still blocking the start action. Does the absence of Sync/Cyl Error counts in the new situation give you a clue about what is going on? Does the programme use any other input to block ignition and injection in case the signal is not OK? Please find the settings file for this job, attached. Could you confirm correct settings for this engine? Hope this will get us any further. With kind regards, Frank van Rouendal

Hello Simon, Thanks for your info. I have re-checked everything. 12 V power is available at both ignition and injection drives. I can trigger injectors individually by earthing the signal connection at the ECU connector, so this works fine. For ignition I cannot do the same, because I have no info. about the signal that drives the coil; no earthing here? Still thinking why I have an increasing Sync/Cyl Error upon starting. By the way, does the programme use any other input to block ignition and injection in case the signal is not OK? Like pressure/vacuum, temperature? Or did I adjust one or more settings incorrectly during set-up? Please find the settings file for this job, attached. In case you have no further possibility for solving this problem, please return the ECU to my address, and I will put all input and output signals on the oscilloscope to check for malfunctioning. Thanks for your efforts. With kind regards, Frank van Rouendal

Hi Simon, ECU was sent to your attention, today. I hope you will be able to find the problem and solution soon, as I am running out of time somewhat. Awaiting your answer, with kind regards, Frank van Rouendal Ferron bv Overdinkel, The Netherlands

Hi Simon, Please find enclosed an additional screen dump of the scope reading, generated with larger time scale. This shows several revolutions of the crankshaft during starting attempt. It should give us a better understanding of the relation between crank and cam sensor. Both are functioning well, apparently. By the way, the ECU still reports "Cyl/Sunc Error". Hope this will give you enough information to sort out the problem. With kind regards, Frank van Rouendal