1993 Saturn SL1 Check engine light codes

  • 1993 SATURN SL1
  • 4 CYL
  • 2WD
  • 90,000 MILES
Hi, I have a 93 saturn SL1, 90,000 miles; My check engine light has been coming on intermittently and I was able to retrieve these codes recently

--26 Quad driver output fail
--32 EGR system fault
--35 IAC valve rpm out of range
--45 oxygen sensor indicates system rich

Also my A/C compressor clutch is clicking and the rpms are idling low, sometimes it is hard to start the car in the morning; any idea of what is going on? Thank you in advance for your time
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Tuesday, March 30th, 2010 AT 10:57 AM

1 Reply





ur code 26 just means u have a failure in the quad circuit which includes ur egr,canister purge,spedo, cooling fan,power seat belts all that.i would start by checking out ur code 32 that could be causing ur code 26 lets fix that and see if ur code 26 goes away.ur code 32 is usually caused by a bad egr valve or egr solindo.sometimes rarely by a blocked egr port.u can test ur egr valve with a vaccuum pump u pull a vaccuum on the vaccuum nipple of the valve with the pump like 25 inch pounds of vaccuum and if it wont hold vaccuum or when u release the vaccuum the egr valve sticks open bad valve.on ur egr solido u would check that with a ohms meter it should read 20-50 ohms.if it tests good i use a hair dryer to simulate engine heat or u can check it when the engine is operating temp just be careful not to burn urself.also check the vaccuum lines to it.both the egr and solindo are under the air cleaner.ur code 35 means u have a high idle or u have a problem with ur idle air control solindo or the wiring to it.usually a vaccuum leak.for a vaccuum leak i would check the hose going to pcv for holes.also check all the hoses to the back of the throttle body.and the vaccuum plate where the hoses attaches its plastic and warpes causing a vaccuum leak.make sure all ur throttle bolts are tight they loosen up all the ones around the throttle body opening even the torx ones.u can also spray some carb spray around everywhere looking for a vaccuum leak if the idle goes down or up or the engine stumbles or dies u have a leak there.for ur code 45 its usually a bad coolant temp sensor or o2 sensor.when u have trouble starting when cold does the engine seem flooded?if u hold ur gas pedal all the way down when u have trouble starting will it start better?its pretty common for the coolant temp sensors to go bad.when u remove the connector look and see if its corroded if it is then replace the connector too.when u remove the sensor make sure the engine is cold and u will loose coolant.the plastic tips of the sensors crack and let coolant into the connector so if u replace the sensor make sure u get a brass tipped one there under 20.let me know what u find.
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Tuesday, March 30th, 2010 AT 1:23 PM

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