| vdawg4 |
07-11-2009 10:52 AM |
trying to solve the mystery
trying to diagnose a component problem. on a 95 ssei. first the car started surging at idle and and would hesitate some on acceleration. not real bad and the car was still driveable. thought it might be vacuum leak but it was not. this went on for severl weeks. then last week the emc kicked two codes.. po118 and po670 these are coolent temp sens and quad driver module 4 fault. replaced the coolent temp sensor.seemed to drive some better but eventually the emc kicked the same exact code for the new sensor. and i am still getting surge and hesitation. seems unlikely the new sensor would have exact same problem as the old one... my understanding of the quad driver module is that on my car it controls a/c relay, mil, low speed cooling fan and high speed cooling fan. all of these components seem to be ok except the mil. for example, the car information center is acting up.. on the diagram of the car, the engine is lighting and chime is ringing. it comes on intermittantly as if there were a short. then yesterday i drove the car about 5 mile and the mil light on the dash kicked on.. today with the actron 9145 scanner, with the ignition on and the engine off, i get system pass no codes .. my question is..is there a way to check the mil system.. is there an actuator, relay,control module, or something else i can check and correct. or would this be a problem with the emc? also, would the driveability problems have anything to do with these codes? thanks very much for any help. vernon
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