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Service engine soon lite


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1990 running ok but 150 miles ago <BR>the service engine soon lite started<BR>comming on sometimes staying sometimes not<P>I'm getting the lite on most of the time<BR>when checking the codes to find the problem<BR>I Get E026c E026h<BR> and b552h ro26h<P>Please help with the code meaning and possible problem<P>Jim Stephens jastep@zapplink.com<p>[ 06-23-2002: Message edited by: ket ]

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EO26 refers to the "Quad Driver" which controls the EGR, TCC solenoid, A/C relay, HI and LO fan relays and the cannister purge solenoid.<P>Check is by entering the diagnostics mode and verifying cycle of outputs 1,4,5,6,7,& 9. See pages 8d1-34 through 39 in the 88 FSM.<P>If occurring intermittantly, it is probably a bad wire or connector but need to know which one.

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Simplified "Check Engine Lamp" diagnostics:<P>A "c" sufffix after the code means <B>current</B>.<P>An "h" suffix after the code means <B>history</B>.<P>Your code E026 is both history and current. This is the code that is setting.<P>EO26 can set if any one of four malfunctions occur:<P>1) EGR coils open or wiring to EGR open.<BR>2) Torque Converter lockup solenod coil open or wiring to TCC open.<BR>3) Air Conditioning relay or AC high speed relay coil open or wiring to such open.<BR>4) Canister Purge or Low speed fan relay coil open or wiring to such open.<P>The computers on cars do not always check for a proper functioning sensor or operation but check to be sure the coil is connected by noting there is a resistance in the circuit and/or current flow to a particular coil.<P>Code EO24 checks for the coil of the relay, clutch, EGR, etc. for connections. Code EO24 does NOT check for proper operation of these devices.<P>There are six pages in the Service Manual on trouble shooting code EO26. The problem is an OPEN circuit.<P>Since Padgett lives in the same town as you do, perhaps he can help you. In any case, you will need a Service Manual.<P>Good luck. An ohmmeter, physical inspection of plugs and wiring and a good sense of logic will find your problem. smile.gif" border="0

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Fixed -- With Padgett help we traced it to a blown 15 amp fuse located in the fuse panel on the passanger side. There's a panel on both sides of the 90's & 91's.<P>Many thanks once again guys<BR>Jim

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