Idle Air Control Stepper Does Not Move
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Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0).
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
The full forum rules are here: Forum Rules, be sure to read them all regularly.
Idle Air Control Stepper Does Not Move
MSII V3 board. V2.88 code. I purchased an IAC that is designed to fit into a 4.0L Jeep Cherokee inline 6 engine. After ohming out the connector, I found pin 1 & 4 were one coil and pins 2 & 3 were the other coil pair. I have tried IAC moving only and IAC always on settings but the stepper never moves. I have looked at the circuits thru an O'scope and found pins 1 & 2 were square waves driving the coils and pins 3 & 4 were close to ground. I have tried reversing pins 1 & 4 and pins 2 & 3 with still no motion. Is there another point in the config I am missing?
74 Datsun 260Z slightly modified
Re: Idle Air Control Stepper Does Not Move
problem found: apparently I have the wrong interconnect cable. Pins 27 & 29 are missing and pin 25 has the shield for the ignition going to it.
74 Datsun 260Z slightly modified