How do I reset the CHECK ENGINE light on a 97 4Runner w/ 3.4L?

Hollywood · 08-12-2007, 10:37 AM

Short story: I got back from the beach, let everything cool, was hosing it out and doing some cleaning under the hood. I think something got too wet. It was mis-firing for about 30 minutes of driving with a check engine light. Runs fine now, but the light is still on. I want to reset it and see if it returns before I take it in for diag.

Any suggestions?

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SC4Runner · 08-12-2007, 11:17 AM

I'm pretty sure you pull the ECU fuse. Don't quote me on that though.

Nismo Convert · 08-12-2007, 11:20 AM

Disconnect the battery, wait about 2 mins, and reconnect.

Elton · 08-12-2007, 11:20 AM

ether pull the efi fuse for a few mins or unhook one of the battery cables

Hollywood · 08-12-2007, 03:06 PM

Thanks for the help, disconnecting the battery for a few minutes did the trick!

GSGALLANT · 08-13-2007, 05:45 AM

Your misfire was likely caused by water getting down into one of your sparkplug holes. Did it to me one time when I washed the engine, with the same symptoms you described.

08-12-2007, 11:17 AM	#2 (permalink)
SC4Runner Contributing Member Join Date: Apr 2004 Location: 5th Gen San Diegan, California Posts: 5,886	I'm pretty sure you pull the ECU fuse. Don't quote me on that though. __________________ 1996 4x4 3.4L 4Runner on 35's - 6" of lift, MTR's, E-locked, ARB Tacoma Bumper, Sliders and a cut off tail pipe. 1966 FJ40 - SOA with stock springs, stock 1F motor, and a smelly tailpipe.

08-12-2007, 11:20 AM	#3 (permalink)
Nismo Convert Registered User Join Date: May 2007 Location: Kincardine, Ontario Canada Posts: 163	Disconnect the battery, wait about 2 mins, and reconnect. __________________ Current POS': 1986 Mazda RX7 TII. Haltech E6x, Koni Yellows, solid motor mounts, 10psi 290ishwhp Stock turbo, and stock intercooler... 1991 Toyota Corolla, AKA Crolls Royce. Sold 1995 Toyota Tacoma! 2.7L 4WD 5SPD. The Purple People Eater:TrueFlow Filter, Bilstein HD's, Magnaflow cat, 2.5" Lift, Bilstein 5150's, 265 Toyo OC A/T's, Hawk LTS pads, Brembo brakes; thats it... For now... 2009 Corolla Sport, 5spd, stock for a lonnnnnnnnngggggggg time.

08-12-2007, 11:20 AM	#4 (permalink)
Elton Contributing Member Join Date: Jul 2005 Location: Siletz,Oregon Posts: 10,647	ether pull the efi fuse for a few mins or unhook one of the battery cables __________________ My Truck 98 4runner SR5 3.4L 5spd 4x4 E-Locker Mods Mom 07 Tundra d-cab limited 5.7L 4x4 auto sister 92 pickup SR5 X-cab 3.0L 5spd 4x4 Papa 89 Pickup SR5 X-cab 4x4 3.0L 5spd/98 4runner SR5 4x4 auto 3.4L R.I.P 91 4runner SR5 4x4 3.0L 5spd Totaled 5/13/06 My Wreck

08-12-2007, 03:06 PM	#5 (permalink)
Hollywood Registered User Join Date: Dec 2006 Location: in the Great Dismal Swamp Posts: 14	Thanks for the help, disconnecting the battery for a few minutes did the trick! __________________ '97 Toyota 4Runner Limited '01 Honda S2000 '93 GMC Shaggin Wagon '00 Glastron SX 195 '82 Yamaha Maxim '06 Troy Built Pony

08-13-2007, 05:45 AM	#6 (permalink)
GSGALLANT Registered User Join Date: Mar 2005 Location: New Brunswick, Canada Posts: 1,760	Your misfire was likely caused by water getting down into one of your sparkplug holes. Did it to me one time when I washed the engine, with the same symptoms you described. __________________ 2002 4Runner, Auto-A340F, 3.4L, 4.30 Gears TJM T15 Front Bumper & Warn M8000, 4xInnovation sliders, Sonoran Steel 1.2 Lift, Toytec LCA Skids, Tundra Brake Upgrade (231mm), Extended rear diff breather, Deckplate Mod, Andymod, Dual batt setup with Optima blue top aux battery, Hardwired 1000W inverter, Aux fuse box, Full time power to 12V plugs, Yaesu FT7800R Radio, "4-air" system for airing up/down tires. 2004 Camry LE - stock (and will stay that way) 1993 4Runner has been sold

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