 Fault Light For Engine Electronic System, fuel or ignition system?? |
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| Fault Light For Engine Electronic System, fuel or ignition system?? |
 Aug 22 2005, 11:05 AM
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Newbie Group: Members Posts: 9 Joined: 23-May 05 Member No.: 5,069 Status:  Location: uk Drives: 1994 850 2.0 auto estate  |
hi all.
ive just changed the gear oil in my 1994 850 and the fault in the engine electronic system warning light on the dash has come on.i took the breather hose off at the air box and cleaned it as well whilst the car was running any ideas?? this has made me scratch my head at this also how do i get rid of the light. gratefull for any help on this regards |
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Aug 22 2005, 01:19 PM
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 Member  Group: Members Posts: 34 Joined: 2-August 05 Member No.: 6,680 Status: Location: Winterswijk, GLD, Netherlands Drives: Volvo 850 Tdi Sedan 1996 |
Possible solution, Mass Air Flow, pulled out the sensor perhaps while the engine was running (or did not connect it at all?)
Found this on Bay 13, it is an official Volvo modification on the MAF connector, and we need to use a tie-wrap in it as shown on the images: Some time after 1996 a message came out about the Mass Air Flow connector on the turbo models. In time and because of the shortness of the connector from the MAF connection and the wiring harness, a resistance can build up on the connection. In time due to vibration, the connector can become chaffed, causing a bad connection. This bad connection can send incorrect information to the Engine Control Module (ECM), it can also set codes suggesting that the MAF sensor is bad. (ECM 121). The above picture is what the typical connection looks like prior to the recommended fix. To correct to potential problem, take the connector off, clean it out with some type of contact cleaner, then plug and un-plug the connector about 20 times. I also put some die-electric grease on the connections or some stable-lite. Once the connector is connected after the cleaning and such, tie wrap the wire to the MAF housing as illustrated in the above photo. This will ensure you don't have problems down the road caused by the connector chaffing. To solve the problem: reconnect the MAF sensor, make sure it is attached properly, drive to your dealer and let them read out and delete the OBDII errors.
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