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Taken from FAQ:
960 Flashing Transmission Lights. [Inquiry] After selecting low gear and accelerating, I get a series of flashing lights: the instrument panel arrow flashes, the lights alternate between "E" and "W" on trans selector, switch positions "E" and "S" will stay depressed when depressed, but "W" will NOT stay depressed. The tranny shifts normally. What is wrong?
[Response: Tom] You have a faulty gear position sensor. I had mine replaced at around 68000 miles, but some last longer. It is on the right passenger side of the tanny, next to the fluid cooler line.
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960: Transmission Lights Flash, Engine Stalls: Bad Ground. [Steve Wilson] Symptoms: Transmission mode selector lights would start flashing as soon as the key was turned on; the up-shift arrow on the dash would flash on & off; and occasionally the engine fails with no spark on 2 adjacent cylinders at the same time. Diagnosis: Since the ignition control modules for the even & odd cylinders are separated, that eliminated that possibility. The only thing those have in common are the ECM & a ground connection at the left (driver's side) motor mount just above the steering rack. There are 2 black wires (the individual grounds for the separate ignition control modules) that exit the harness approximately 3 inches long with a crimped terminal on each. The fixing bolt also acts to secure a corner of a plastic shield for the wire harness. I had checked continuity previously from the bolt to ground and gotten a good reading. This time I removed the bolt and connected both ground wires to a common ground back to the battery negative terminal. As soon as I turned the key and the transmission mode lights didn't flash I knew I was on to something. The 2.9 sprang to life on 4 cyl, the 2 plugs were still removed and were firing like crazy. This is the ground Volvo identifies in their schematic as a "power ground". If your car just sputters and dies and won't restart, look here before buying any parts.
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My '92 960 wagon will not start after short trips. The gear shifter will lock when placed into "park" and the car will not make a sound (other than the "click" when I turn over the ignition) when I attempt to re-start it. Usually, after sitting for about an hour, the car will start normally. Is this my PNP switch? [Response: Etherman] Put the trans in PARK. Turn the key to #2. Step on the brake and attempt to shift out of Park. Does it happen? I think it will. If so, your PNP is working. In this case, look to a bad battery and/or voltage drop in the batt cables which may or may not exhibit signs of corrosion. Check the voltage drop on both cables. $5.00 says your positive cable needs to be spliced or replaced.
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The Gear position sensor I hear is a common problem on these cars. Hope this stuff helps and let us know what the outcome is...
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1998 Volvo S90 SE (Black Cherry) 264,000+km
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