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Besides the fuel relay and the radio suppression relay, the crank position sensor may be at fault. I've had an occaisional no-start with my '93 940, Regina system. The last time it failed to start, I disconected and reconnected the crank sensor and wiggled the sensor cable down at the sensor and the car started. Today I replaced that sensor. The old one was probably original with 10 years and 107,000 miles on it. The rubber covering had split open at the sensor where I couldn't see it and there may have been an intermittant connection inside, I can't be sure. I just went out to the garage and checked the resistance of the pick-up coil in the sensor. When I move the cable near where the insulation had come off, the coil will short out. There's a good chance that has been the source of my no start.
Several on this board have recommended the replacement of the crank sensor as a preventative measure at my car's mileage. The sensor isn't expensive and took me about 10 minutes to replace.
By the way, if you feel the injectors while the ECU is going through the test sequence, you can tell if they are pulsing. If they are, the suppression relay is working since it has to complete the ground circuit for the injectors.
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