Car died in intersection .

[Pring]

i checked and i i have no voltage bewteen 1&2 or pins 2&3, anybody know what the problem is?

Hey guys sorry but if this man's computer could get the codes but when he went was trying to access a spot where all the data was shown in his device it couldn't go any further is wasnt' able to read the info he was trying to get to. He said if he could get that info he could tell me exactly what the problem was. If it be a grounded wire he could find it. Or if it were a blow resistor or what have you. Do you guys think that my computer is fried ? SOrry if this is hard but I'm starting to freak.. It is getting time to go back to school and I need a car .. Thanks

 

[xdxoxuxgx]

It could definitely be the ECU, my car just shut off and it would crank but it wouldn't turn over. My ECU was fried, we replaced it and it started right up. The ECU shouldn't be expensive, they're probably cheaper for non-turbo cars anyway. Good luck

 

[Pring]

how much do yo think a ECU would cost.?.. did you run alot of differant diagnostics. cause I've spent some considerable time in the garage doing all sorts of continuity tests.. any idea how to check to see if the computer is bad ? for sure ? Thanks maybe I'll call a junk yard to find a used ECU thanks.

 

[xdxoxuxgx]

Well my car got towed to a garage and I guess they did the diagnostics, though you could see the burn mark on the ECU where it fried , though I'm not sure how you could tell for sure. You should check in the classifides on this site for an ECU, you'll definitely be able to find one.

 

[Pring]

how much were you charged for a brand new one ? because I'm kinda of in a pinch for time here.

 

[xdxoxuxgx]

I bought mine from a fellow DSMer that lives about 5 minutes from me for $125, i was told by the shop that a rebuilt one would be $600 and a new one would be $1200, so that's a pretty good reason to look under the classifides to get a cheap one.

 

[Pring]

I found an ECU at a junkyard for 100$ but I don't wanna go buy it and have the ECU not be the problem.. I took the ECU out and pulled the cover off. There doesn't seem to be any black marks or anything looks suspicious. Any other things to look for ?

another question sorry to double post but where is the crank angle sensor and how do I test it to see if it is bad. I'm running out of things to check here haha .. I'm starting too get upset.

 

[xdxoxuxgx]

Well like I said, I'm not really sure how to actually check the ECU besides the burn mark on mine. I would agree with you that I wouldn't want to buy an ECU and have that not be the problem. It could be a whole list of things, but whatever it is it's probably something small and dumb.

 

[Pring]

CrankAngle Sensor ?? anyone have any idea ?

 

[Locke]

The 420a's crank angle sensor is a hall-effect sensor, and can be tested as described in this page: Automotive Tutorial - trigger signals

It is located on the back of the block, mounted into the block just above the oil filter.

 

[Pring]

do you think if the ECU wasn't picking this up it would shut off power to the Relay that is mounted on the firewall ? That is the problem i'm having. Hope you guys can get me running. thanks
or would a bad CAS cause me to have no spark?

 

[Locke]

A bad crank angle sensor would cause you to lose the spark signal.

You should still be getting power from the ASD relay.

 

[Pring]

I have power to the ASD for the first 3 seconds. So when the fuel pump is running butthen it clicks off and doesn't click back on when cranking the car over.. any other suggestions ?

 

[Locke]

Are you sure you're checking the correct relay? The fuel pump relay will be the left most of the pack of them against the firewall, as seen when standing in front of the vehicle. The ASD relay will be to it's immediate right.

 

[Pring]

I only have 2 relays ... not 3? does that help anyone out I've been checking the one that is on the left.

 

[dr1665]

1. It's not the ECU.

2. The ECU needs to see signals from cam position (CMP) and crank position sensors (CPS). If it does not see these, it trips the ASD and the engine will not light off. (No signal to the coil.)

3. Both CMP and CPS are tested the same way - backprobing the connector during cranking and looking for an alternating 5VDC (volts, dc).
--3a. Backprobing means sticking a pin or paperclip into the connector from the wire side, then touching the probes from your multi-meter to them so you can get a reading while the sensor is hooked up.
--3b. You have to watch the meter while cranking. The CPS will be switching between 5VDC and 0VDC at crank speed. The CMP will do the same thing at HALF crank speed.
--3c. You can use a Chilton's manual (or the ECU pinouts in the 2GNT wiki) to also check these signals at the ECU connector if you want to avoid lying under the car to get to the CPS.
--3d. CMP is on the driver's side of the valve cover on the front. CPS is on the back of the engine block, near the oil pressure sending unit.
--3e. It is VERY COMMON for the EGR pipe that runs along the head under the intake pipe to melt wires and cause a short in this system. Save some time and inspect that section of the wire harness for any signs of melting or damage before you do anything else. (I just mention this here because it works with the flow of my post.)

ONLY if both your CMP and CPS test out okay at both the sensors and ECU connector do you have reason to suspect either the ASD relay (prime suspect at that point) or ECU (very rare that this shits the bed, imo.)

Oh yeah, and since you have a 97, you shouldn't have to go to Autozone or borrow a scanner to pull codes since you can do the Keydance. Here's how to do the Keydance.

It's a 97. Keydance it, see the CMP/CPS code, suggest EGR harness check. Call it a day.

EDIT:
2 relays are ASD (left) and FUEL PUMP (right).

 

[Locke]

2. The ECU needs to see signals from cam position (CMP) and crank position sensors (CPS). If it does not see these, it trips the ASD and the engine will not light off. (No signal to the coil.)

I wasn't aware of that. Good to know.

EDIT:
2 relays are ASD (left) and FUEL PUMP (right).

You must be logged in to view this image or video.

 

[Pring]

so we narrowed things down to a broken wire a bad ground or the crank shaft position sensor is bad.. Because when I turn the car to the start position I have to no power to the (cps). Does anyone know some key spots to look for broken ground/wire other than the ones mentioned above by the pipe cause the cluster of wires looks perfectly fine in that general Area. Any help is great.. Thanks

 

[Locke]

Crack open the loom on the harness near the EGR pipe, there may still be damage. You could try pin-probing sections of wire to check for broken circuits.

 

[Pring]

Ok upon getting under the car and looking for the CPS. I noticed alot of furry material around the belt area. At first I thought maybe a rodent or something I may have hit.. but then upon inspecting the timing belt. It is toast. holding on by about 3 seperate strands. about a quarter inch thick. Might this obviously be my problem? Would that obviously be the reason I dont' have spark. When I turn the car over the timeing gears dont' move. Doesthis mean a lot of bad things to come for me ? Or is this going to be an easy fix ?

 

[psycho]

Replace the timing belt, tensioner, idler pulley and water pump. Re-time it and see what happens. Usually a broken timing belt means bent valves but maybe you got lucky.

 

[Pring]

not broken actually... Just shredded.. still hanging on but barely.. it looked like a rat built a nest inthe cover.

Is there anyhope since I was idleing whenthe care stauled that I might not have any bent valves. I didn't hear any noises when it stauled. and the Belt is still hanging on a little bit It didn't blow off so ?? IS there any hope for me ?

 

[Locke]

Put a new belt on, time the engine, then do a compression test.

 

[bullettdsm]

IS there any hope for me ?

Yes...... Well, I mean the engine

MB

 

[Pring]

have any of you guys ever shredded a Timing Belt and not bend all your valves.. Cause that would potentially make my day if that actually had a moderately decent chance of happening. thank you. You guys ahve been alot of help.