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Toyota Camry 1989 has two codes set in memory, 12 and 51 Help?
No spark and no pulse at injectors. Main relay has power and fuel pump is receiving power in crank position. Tried igniter and no change, strongly suspect ECM has died. Distributor went up in smoke and would not start even with replacing distributor and ignition coil and igniter. Old coil was cracked badly 1/4 inch crack and white molten plastic leaking from crack. Any help appreciated.
Diana, I asked a serious question and you post and advertisement in response. I have a good sence of humor but please stop if you can't be of help.
Engine has no knock sensor, it is not missing, this engine did not come with one. I checked and there is no hole in the block at the correct location and no wires coming from the harness to be used for this purpose.
4 Answers
- 10 years agoFavorite Answer
Code 12 is RPM signal, ecm isn't receiving tdc so it doesn't know when to throw spark. Code 51, switch signal, no idle signal is being recieved. All that's left is checking continuity between the pick-up coil wires in the distributor and if that comes up ok I would then replace the ecm.
Even if you had a knock sensor you could pull the wires off and the car would start and run.
Everything the ecm needs to determine tdc is in the distributor. It does not have an external crank positon sensor. That came about in the middle 90's
- FlagMichaelLv 710 years ago
Diana was a spammer, so I reported the answer.
Code 12 is "Knock Control Sensor signal" and 51 is "Switch signal" - both are not very helpful. The knock detector can cause the power to be low but should not interfere with starting. The "switch signal" code is one of two codes with that designation. Because it is producing codes I doubt the ECU is bad. Since you replaced the igniter (my next suspect) I would look to the crank sensor, which signals the ECU that the engine is turning and when it is at TDC. Blind replacement is premature but if you can verify it is producing a signal that would be great.
Good luck - when it gets to this stage troubleshooting gets tough.
Source(s): http://www.troublecodes.net/Toyota/ 35 years maintaining my own codes - The DevilLv 710 years ago
12 is for a bad knock sensor
51 is for a bad signal concerning the airconditioner.
There is likely trouble originating with your ECU.
Get a used ECU from the salvage yard.
Source(s): Innova Import code reader manual # 3005
