# Check Engine Light? **URL:** \ **Category:** SON240sx Automotive\ **Created:** [April 30, 2007, 11:54am UTC](https://forums.speedlife.net/t/check-engine-light/106102 "2007-04-30T11:54:06Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![PureEuroM3](https://avatars.discourse-cdn.com/v4/letter/p/3bc359/32.png) [@PureEuroM3](https://forums.speedlife.net/u/PureEuroM3)\ **Post date:** [April 30, 2007, 11:54am UTC](https://forums.speedlife.net/t/check-engine-light/106102/1 "2007-04-30T11:54:06Z")
It just went off after doing a compression test. I put the plugs back in, torque to 15 and than put the wires back on. I than re-attached the two harasses. Does anyone have an idea…oh ya I tried to un hook the battery and re connect it, no difference. On a good note my compression showed 185-175psi dry and 197-185psi wet ---
**Author:** ![PureEuroM3](https://avatars.discourse-cdn.com/v4/letter/p/3bc359/32.png) [@PureEuroM3](https://forums.speedlife.net/u/PureEuroM3)\ **Post date:** [April 30, 2007, 11:54am UTC](https://forums.speedlife.net/t/check-engine-light/106102/2 "2007-04-30T11:54:06Z")
It just went off after doing a compression test. I put the plugs back in, torque to 15 and than put the wires back on. I than re-attached the two harasses. Does anyone have an idea…oh ya I tried to un hook the battery and re connect it, no difference. On a good note my compression showed 185-175psi dry and 197-185psi wet ---
**Author:** ![s1495](https://avatars.discourse-cdn.com/v4/letter/s/b2d939/32.png) [@s1495](https://forums.speedlife.net/u/s1495)\ **Post date:** [April 30, 2007, 10:13pm UTC](https://forums.speedlife.net/t/check-engine-light/106102/3 "2007-04-30T22:13:48Z")
> [@circuit city customer service](https://forums.speedlife.net/t/circuit-city-customer-service/12373/4): > > It just went off after doing a compression test. I put the plugs back in, torque to 15 and than put the wires back on. I than re-attached the two harasses. Does anyone have an idea…oh ya I tried to un hook the battery and re connect it, no difference. > > On a good note my compression showed > 185-175psi dry and 197-185psi wet Disconnecting the battery won’t do much - to reset the ecu - unplug it and rotate the small knob on the back of ecu to diagnostic mode then back. But first check the codes - it could have had enough time to detect maf disconnect (my guess is those are 2 harnesses you were talking about – IAT sensor and MAF). Check your codes. Jack ---
**Author:** ![Lith](https://avatars.discourse-cdn.com/v4/letter/l/fbc32d/32.png) [@Lith](https://forums.speedlife.net/u/Lith)\ **Post date:** [May 1, 2007, 6:34pm UTC](https://forums.speedlife.net/t/check-engine-light/106102/4 "2007-05-01T18:34:09Z")
turn the ecu to diagnostics mode and check how many times the check engine light blinks. Here’s a guide: [http://www.ka24development.com/ecu\_codes.html](http://www.ka24development.com/ecu_codes.html) ---
**Author:** ![Osad](https://avatars.discourse-cdn.com/v4/letter/o/3ab097/32.png) [@Osad](https://forums.speedlife.net/u/Osad)\ **Post date:** [May 1, 2007, 7:30pm UTC](https://forums.speedlife.net/t/check-engine-light/106102/5 "2007-05-01T19:30:53Z")
Good link. Lith, come to the meet! ---
**Author:** ![PureEuroM3](https://avatars.discourse-cdn.com/v4/letter/p/3bc359/32.png) [@PureEuroM3](https://forums.speedlife.net/u/PureEuroM3)\ **Post date:** [May 1, 2007, 7:32pm UTC](https://forums.speedlife.net/t/check-engine-light/106102/6 "2007-05-01T19:32:55Z")
> [@TW: Pioneer In-Dash Multimedia A/V Receiver](https://forums.speedlife.net/t/tw-pioneer-in-dash-multimedia-a-v-receiver/12319/27): > > Good link. > > Lith, come to the meet! I’m coming to you bastard. ---
**Author:** ![rsam240sx](https://avatars.discourse-cdn.com/v4/letter/r/4bbf92/32.png) [@rsam240sx](https://forums.speedlife.net/u/rsam240sx)\ **Post date:** [August 27, 2007, 10:20am UTC](https://forums.speedlife.net/t/check-engine-light/106102/7 "2007-08-27T10:20:12Z")
The check engine light came on a while back. I finally got around to reading the ECU trouble codes. The diagnostic trouble code is 55 - no failure (No self Diagnostic Failure indicated) – this means all is OK. I then cleared the stored codes on the ECU but the light came back on and again got DTC 55. Anyone experience this before or know what’s wrong? Do I have to take it in and get Nissan to read/scan it?? Oh yeah my car is a 1995… Any help would be greatly appreciated, I hate seeing that light on… thanks Rick ---
**Author:** ![rsam240sx](https://avatars.discourse-cdn.com/v4/letter/r/4bbf92/32.png) [@rsam240sx](https://forums.speedlife.net/u/rsam240sx)\ **Post date:** [August 27, 2007, 10:23am UTC](https://forums.speedlife.net/t/check-engine-light/106102/8 "2007-08-27T10:23:09Z")
Sorry I meant to create a new thread… please ignore this… Rick