Question about 1994 Toyota Corolla

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How do i get codes out of the ecm 1994 toyta corolla can i use a jumper wire? if so what wires do i jump?

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Best is to take to a friend or someone who has a scan tool with OBD2 compatability. This is the best way to find, scan, and print out the codes. Jumping may cause damage to the computer.

Posted on Mar 14, 2011

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1 Answer

Can a vehicle run with a non functioning ECM?


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99 dodge ram 5.9 if I groung the relay to build fuel pressure the truck will start and run on it's own thought I had a loose connection went back to same problem in a day.


If you jumped the ground, then removed the jumper wire and it stayed running (meaning the ECM/PCM is working). I would check the wire from the relay to the ECM/PCM. Use an ohm meter and check resistance. Put it on the lowest setting (200). There should be any more than 5 ohms. It will usually read .05 or close. Up to 5.0 is OK. Anything over that run a new wire. If it died when you removed the jumper, you will still need to check the wire close to the ECM. You can use a test light for this. Hook the light to the positive side of the battery+.Then probe the wire and have some one turn the key on or try to start the truck. The light should come on. If it does, the ECM is good, replace the wire. If the light doesn't come on. The ECM is bad. Sending a schematic of how it works .



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Dec 27, 2014 | Cars & Trucks

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How do I check for spark in my 1994 toyota corolla. I have volt/ohm/amp meters if necessary.


Disconnect a spark plug wire ... attach a plug to it ... turn the engine over ... watch the plug ... spark?

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1 Answer

How do I obtain and read the error codes on a 1991 Geo Tracker?


You must use a short jumper wire to ground the white diagnostic connector. This terminal is part of the Assembly Line Diagnostic Link (ALDL), located under the dash near the ECM. This is under the passenger side glove box behind the kick panel.

To activate the diagnostic codes, jump terminals 1 and 3 (the two outer terminals of the white connector). Then turn the ignition switch to on (engine not running). The check engine light will flash a code of 12 three times and then display the stored trouble codes.

To clear the codes, remove the ECM fuse for at least 10 seconds.

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1 Answer

MY COROLLA 1994 I PUT THE SCAN AND THE RESULT IS DTC 43 HOW I CAN DO TO REPAIR


That code 43 is: "starter signal". The diagnosis is: "No 'STA' signal to the ECM until engine speed reaches 800 rpm with the vehicle not moving."

Areas to check are the starter signal circuit, the ignition switch, the main relay switch, and the ECM itself. If the engine can be started, there may be a poor wire connection from the starter relay to the ECM.

If the engine cannot be started and you have a manual transmission, first check that the clutch/start switch is closing properly when you push down the clutch. You will find it under the dash near the top of the clutch pedal lever arm.

The starter relay should be in the engine compartment fuse box and its internal coil should be checked with an ohm meter. If the coil is open, the car won't start and the start signal (STA) will not be sent to the ECM.

Feb 06, 2011 | 1994 Toyota Corolla

1 Answer

What is needed to fix fault codes 14 and 24 for a 1994 toyota corolla


The following is from a Haynes manual for 1993-1996 toyota corolla and geo prism:

Code 14: ignition signal. No ignition signal to the ECM. Check igniter or circuit, ignition coil, ig. switch or circuit, ECM (engine control module or "computer")

Code 24: intake air temperature sensor. Open or short in the intake air temperature sensor circuit. Check intake air temp. sensor or wiring to ECM.

Jan 27, 2011 | 1994 Toyota Corolla

1 Answer

How can I replace an alternator in a Toyta RAV4 2006?


if i recall correctly about a 30 - 40 minute job its mounted on top of the engine so easy to get to. theres just a couple of nuts and bolts to remove alternator along with wiring on the back of it. JUST REMEMBER TO DISCONNECT BATTERY EARTH LEAD FIRST then reconnect when new alternator fitted, ensure alternator drive belt is tensioned correctly also. hope this helps

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1 Answer

How do i check my engine trouble codes on a 1994 COROLLA


take it to advanced auto parts. they will hook a computer up to your car for free and tell you the codes. you dont need to be jumping anything

Apr 20, 2010 | 1994 Toyota Corolla

1 Answer

My 1994 suburban engine stops. No fuel, no MIL light.


I checked all of the fuseable links and they were all good. Next I decided to check all the power wires to the ECM and also the grounds from a wiring diagram because the Mil is controlled by the ecm and the bulb was good. The ecm is located behind the glove box. Bingo, the orange wire was only reading 3-5 volts at the ECM, but 12.5 volts after the fuseable link at the underhood fuse block (passenger side firewall). I ran a temp wire directly from after the fuseable link to the orange wire at the ecm and the ecm turned back on and the Mil or "check engine soon" light came on too. The truck started up and has never run smoother.

Note that at first the truck just stalled out and I could restart it right away with no error codes. Eventually the stalling became more frequent with longer reset times required. Once it threw a "code 54" and I thought it was fuel related as each time the gas stopped and I could still start the truck with gas poured into the TB. Ignition ok. My fuel pump turned on and ran if I tested it. I even checked the pressure regulator and the fuel filter to no avail.The orange wire that powers up the ecm is technically part or the fuel pump relay circuit as it also feeds the fuel pump relay 12.5 volts all the time. The thin orange wire from the fuse block is joined to two other thin orange wires in the large group of wires that heads to the ecm along the firewall behind the engine. I had to dig it out of the many wires to find it and remove a lot of tape. It is amazing to me that this one little orange wire could cause so much grief and be so hard to track down. I could not have afforded to take this problem to the Dealer.

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