1990 Camry Trouble

[jgcertified]

Hello all.. My camry is at it again.. I fixed the last problems.. (Was a hole in the radiator what was causing a lot of trouble)

Now I have new ones

Just as a refresher it's an I4 and it's done about 373,000 k's
For the Aussies who read the forums the engine has only done 82k .. It's an HM/Gem remanufactured motor

The problems are as follows:

Slight unevenness on acceleration and idle once warmed up (Almost like it's running on 3 cylinders)

When I check my oil there's little bits of crap on my dipstick from the oil (It was changed about 2000 k ago)

The ECU gives me diagnostic code 12 .. But I've never seen the check engine light come on

If you need any more details let me know.. I'm not a big one for going "Oh my god! What's happened.. HELP!"

[Dr Tweak]

The code 12 is related to the crank position sensor which is in the distributor. That very well could cause the problems you're describing. I would try pulling an entire junkyard distributor and replace it and see if that fixed your problem.

-Doc

[toyomoho]

Code 12: G, NE Signal Circuit (No 1)

The code is set if the ECU does not receive a NE signal for 2 seconds. Or a G signal for 3 seconds with RPM between 600 and 4K.

The distributor has two signal rotors. One sends out a G signal representing the standard crank position. Assume this is No 1 cylinder DTC. The other rotor sends out a signal representing crank position. Assume this is each cylinders TDC. The inputs from both signals allow the ECU to control timing.

Might check the following resistance:
G to G-- = 140-180 ohm
NE to G-- = same as above

When looking at the front of the electrical plug for the distributor, with the plug lock down. The terminal layout is G and NE on top (left to right), G-- (in lower right corner of plug).

The air gap between rotor and pick up coils should be 0.008 inch (0.2mm).

Check for loose or disconnected wires between the distributor and ECU. Coil primary resistance 0.41-0.50 ohm cold, secondary 10.2-13.8 ohm cold. Ignition wire resistance should be 25K ohm per wire.

[jgcertified]

I'll have to give that a shot then..

Gotta love family.. Mum insists that the car still belongs to her.. But when I say it's broke.. Not her problem ^o)..

The other thing was the junk in my oil.. Would a disintergrating rear-main oil seal do that? It's more of a gusher than a leaker now

[fredk]

drain it into a clean pan and look at it, and put a rear main in

[toyomoho]

Might be the seal coming apart. The screen and filter should pick up most of it. But long term best to find the problem otherwise you could have bearing problems. If you drop the pan, check the oil pump screen.

[bdc961]

Hello all.

I have a 94 Camry LE 2.2L. The check engine light is on and through some web surfing I was able to figure out how to retrieve the code for the problem. I was looking through your forum and came across a post from 2006. The solution provided by toyomoho below is, I believe, what I am looking for, I think. However, I have a few questions about the possible solution.

1st ? / What do all the accronyms mean?
ECU?
NE signal?
G signal?
DTC?
TDC?


2nd ? / The author, toyomoho, goes on to discuss checking resistance, I.E. G to G, NE to G. Does anyone have a diagram of the terminal layout the author is mentioning?

Thanks in advance for all your help.

Originally Posted by toyomoho

Code 12: G, NE Signal Circuit (No 1)

The code is set if the ECU does not receive a NE signal for 2 seconds. Or a G signal for 3 seconds with RPM between 600 and 4K.

The distributor has two signal rotors. One sends out a G signal representing the standard crank position. Assume this is No 1 cylinder DTC. The other rotor sends out a signal representing crank position. Assume this is each cylinders TDC. The inputs from both signals allow the ECU to control timing.

Might check the following resistance:
G to G-- = 140-180 ohm
NE to G-- = same as above

When looking at the front of the electrical plug for the distributor, with the plug lock down. The terminal layout is G and NE on top (left to right), G-- (in lower right corner of plug).

The air gap between rotor and pick up coils should be 0.008 inch (0.2mm).

Check for loose or disconnected wires between the distributor and ECU. Coil primary resistance 0.41-0.50 ohm cold, secondary 10.2-13.8 ohm cold. Ignition wire resistance should be 25K ohm per wire.