1993 Mazda 626 Car unable to start

Tiny
FRUSTRATEDMAZDA1993
  • MEMBER
  • 1993 MAZDA 626
  • 4 CYL
  • FWD
  • MANUAL
  • 156,000 MILES
Cryptic problem and question. Car engine died after fairly severe impact of bumping through over gravel "speedbump" on farm road on steep gradient. Speed at time of impact +-4 kph. Engine died at exact moment of impact. (No damage to underside of car at all). Car will not start but engine to what is wrong. Only things discovered are: no spark at plugs (New dissie did not help), no current at fuel pump and central locking system not operating. All of aforementioned only since incident took place. What could the problem be please. The agents have tried for 4 weeks to find the problem to no avail. If a fix is found I will be more than willing to make a donation once the car IS fixed. Regards Graham Chaman.
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Wednesday, January 14th, 2009 AT 4:41 AM

5 Replies

Tiny
RASMATAZ
  • MEMBER
Test the main relay and fuse no. 10 in the joint box
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Wednesday, January 14th, 2009 AT 6:22 AM
Tiny
FRUSTRATEDMAZDA1993
  • MEMBER
The agents have already done the above.
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Thursday, January 15th, 2009 AT 8:50 AM
Tiny
RASMATAZ
  • MEMBER
Have they tested the fuel pump relay if not advise on it-try having them direct battery voltage straight to the fuel pump and see what happens. Also to test the crankshaft position sensor
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Thursday, January 15th, 2009 AT 2:54 PM
Tiny
FRUSTRATEDMAZDA1993
  • MEMBER
They have checked both the crankshaft and the cam sensors. They also used a direct lead from the battery to the fuel pump to try to start the car. This way the fuel pump operates but, No Go. Is it possible that some connecting plug on the wiring which is carrying voltage to both fuel pump and distributor could have been shocked loose by the bump? (Hence my request for diagrams hereunder).

I noticed that my original explanation to you of the problem is for some reason incomplete. Forgive me but I am going to include here the explanation again for better clarification.

Here goes. I will make it cryptic without losing detail. Car crossed a type of "speed bump" on a gravel road on an up gradient. The speed bump not for speed but to drain rainwater from the road to each side of the road. The car bumped through on the chasis just to the rear of the front suspension but with absolutely no damage to the chasis at all. At the exact moment of impact, (bumping through), the engine "died". After the incident I could not get the car started until now. I know Mazda had a weakness in the distributor in this model and so I fitted a new distributor at very high cost. Still no spark, no start. The car is now at the agents in the nearest town but they cannot trace anything as they do not have the official workshop manual/s for this vehicle as the manuals were not in the company when they took it over around 2004. The previous owners took all manuals with them when they left. All they can tell me is that there is no spark at plugs, (new dissie did not solve problem), no current at the fuel pump and the central door locking system also does not work. I suspect that there is some form of impact switch somewhere in the car which might have triggered through the fairly severe impact mentioned. The problem is, WHERE it could be on the vehicle. The South Africam Factory maintains that there was no impact switch of any kind on 1993 models. Furthemore the factory says that they do not have any car manuals older than 10 years (1998). This is a problem as my car IS a 1993 model. Another agent some 1000 kilometers from me at the other end of the country says that there was an impact switch connected to the central door locking system. Is it not possible that the dissie and fuel pump are connected through the same circutry? If so, I am in desperate need of detailed wiring diagrams of the car system as well as the onboard computer, the ignition circutry, engine ignition circutry, factory immobilizer circutry, fuel injection circutry and the fuel pump circutry, the impact switch circut if it has one and the circut diagram of the central locking system. If my request for wiring diagrams would mean the upload of a very big file perhaps you could e-mail them to me. If so I will give you my e-mail address. I would also very much appreciate any written advice to go with the diagrams. I will leave it to you as to what you feel I need in order to fix this D. MN thing. Finally the agents say that for them to hit miss diagnose the problem as they don't have a manual to check the wiring it will cost me more than the car is worth at present. I believe there must be some small problem. There must be a fix and I am looking to you wonderful guys to PLEASE! ! ! Help if you can. Regards, Graham Chapman
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Thursday, January 15th, 2009 AT 10:18 PM
Tiny
RASMATAZ
  • MEMBER
Again test the main relay and fuse no.10-be advised you only have (1) fuel pump. Powering the fuel pump direct-if the fuel pump is good should come on.

Below is your electrical diagram


http://www.2carpros.com/forum/automotive_pictures/12900_diagram_2.jpg

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Friday, January 16th, 2009 AT 11:12 AM

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