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| efxr6wagon |
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The idle speed control valve suddenly stopped working a few days ago. Unplugging it had no effect, so it clearly wasn't working. I bought another one from the wreckers, installed it, and it worked fine.
Started the car again today, and the "new" ISC has the same problem. No change when you unplug it. I back-probed the terminals of the connector, and am getting full battery voltage on both. Does that mean that my "new" ISC has failed too? What are the chances of that?
_________________ 95 EF XR6 wagon, 17" FTRs, DBA rotors, KYB/Koni, AU bottom end, ported EF head, backcut valves, SS Inductions, Territory intake, 10.2 CR, Auckland 1258 cam, vernier gear, PH4480 headers, no cat, Tickford 2.5", 2800rpm stall, J3 chip |
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| Krytox |
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perhaps the ECU driver is stuffed, try another ecu.
_________________ Carefree, we may not be number one, but we're up there. |
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| efxr6wagon |
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Thanks for that. If I'm getting full voltage to the ISC, doesn't that mean that the ECU driver is trying to open the valve, ie functioning properly? Thanks for the help.
_________________ 95 EF XR6 wagon, 17" FTRs, DBA rotors, KYB/Koni, AU bottom end, ported EF head, backcut valves, SS Inductions, Territory intake, 10.2 CR, Auckland 1258 cam, vernier gear, PH4480 headers, no cat, Tickford 2.5", 2800rpm stall, J3 chip |
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| snap0964 |
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Nah, most if not all of the actuators/controllers get 12v on one side, and 12v the other if they're closed, not operating, etc. The ECU then controls one side by varying voltage - in the ISC's case, it may be a PWM signal, can't remember.
I think the Gregory's gave the respective outputs - the ECU pinouts in the Tech docs might give you some values as well. +1 on Andrew's call on the blown driver.
_________________ 96 XH Longreach 'S': LPG, Alarm, 3.23:1 LSD, Cruise, Trip Comp, ABS, Power Windows, Mid Series Dome Lt, Climate Ctrl |
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| TROYMAN |
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the isc has constant 12v with ignition on, the controler is controled by pwm on the earth side..
the isc driver in your ecu might be crook?? |
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| efxr6wagon |
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Seems like it was the ISC driver in the ECU. I replaced the ECU and it's all good. Thanks for all the good advice - you guys are onto it.
I talked to my friendly Ford mechanic about it, and he says it's fairly common for the ISC to fail and push 12V back into the 5V ECU, which burns out the driver. So, if you replace the ECU without replacing the ISC, you will blow the new ECU again. The old ISC promptly went in the bin  Thanks again.
_________________ 95 EF XR6 wagon, 17" FTRs, DBA rotors, KYB/Koni, AU bottom end, ported EF head, backcut valves, SS Inductions, Territory intake, 10.2 CR, Auckland 1258 cam, vernier gear, PH4480 headers, no cat, Tickford 2.5", 2800rpm stall, J3 chip |
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