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Persistent Code 9

Old 12-06-2010, 08:00 PM
TexasHonda's Avatar
Super Moderator : And A Texan
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Join Date: Feb 2007
Location: Katy, TX
Posts: 9,651

The way I eventually convinced myself the ECU was likely the problem was disconnecting the B (middle) connector at the ECU and measuring the CYP sensor resistance (orange, pin 11 and white, pin 12 wires) from that point. I got values of ~820 ohms, nearly same as I got at every other connector stage of the wiring harness.

Since you've replaced the ECU, I would check the sensor resistance as described above to check for a wiring fault or sensor fault. If you get out of spec values (too low or high), check closer (right fender shock tower) to the distributor, and finally at the distributor connector. If you get good sensor resistance at all those points, it would suggest an ECU fault as I had.

good luck
Old 01-29-2017, 02:45 PM
Join Date: Jan 2017
Posts: 1

I had a code 9 in my 94 accord, went threw 3 distributors, had the timing belt done and still the code came back, put a new ecu in and she runs like a champ.
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