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Q: code 1633 voltage too low. what could be the problem?
on 2003 Ford Taurus

Car seams to run good, but the check engine light stays on and the code is 1633, voltage to low.
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1. Check fuse #22 10A in the engine compartment fuse box for battery voltage at all times. Replace the fuse as needed and recheck operation.

2. If the fuse is OK, access the Powertrain Control Module (PCM) connector. Check the Pink/Light Blue (PK/LB) wire at pin 55 for battery voltage at all times from fuse #22. If there is low or no voltage on the wire, locate and repair the open circuit between the engine compartment fuse box and PCM.
I'm thinking I might be the last person to have heard about this concerning a cars 'engine light'. I have a 2003 Sable which will give off an 'evap code' as soon as the 8th monitor kicks in, so the trick is to get through inspection on the 7th monitor leaving only 'one' inactive (Which is allowed for any vehicle made in 2001 and later). Well the engine light came on and remained on with only two monitors working this time so I was completely lost on why? Disconnected the batt again, reconnected and got a code 1633! I restarted the car and now there were 'no' codes! I discovered that a 1633 code (which until now, I had never even heard of) had to do with a 'fuse'? Yes, a damn fuse! I checked the fuses and discovered one 10 amp of no importance fuse that was bad. I replaced it and the light went off, yaa. I always believed they could not make that 'idiot light' any stupider but they proved me wrong again. Now I happened to have a test light making the task easy but I couldn't help wonder how many older or even younger people have encountered this most disturbing feature (Broken fuse) of our auto systems protector, the 'engine light'? And how many out of all those people felt they had a major problem and took their car to any one of thousands of those auto 'specialist' who would be more than happy, in fact ecstatic to locate the problem for them at such a minimal charge? In fact I'm sure a few have even hit the 'panic' mode on this one and 'junked' their cars! Beware of the 'Blown fuse' encounter! Dave NJ
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