Car dies? Code # 00253 undocumented code what does it mean
have the same problem?
Wednesday, October 12th, 2011 AT 4:38 PM
WAY too many details to sort through. "Undocumented" means it's not a legitimate code for that car model. What have you checked so far? What are the symptoms? At least tell us which engine you have. Do you still have spark? Did you check fuel pressure? Does the battery crank the engine normally? Pretend we're not standing next to the car and can't see or hear what's happening.
Wednesday, October 12th, 2011 AT 5:00 PM
It has a2.7 vin r the car runs fine it will be driving along the car dies fuel pressure ok loses spark intermitley when plugged into scanner veh reads no tps, cps, cmps but still runs only code is 00253 thats why I needed info on that code please
Wednesday, October 12th, 2011 AT 5:26 PM
That code, when used, refers to a diesel injection pump.
How are you getting the information on the TPS, crank, and cam sensors? If you're not getting fault codes related to them, are their values just not showing up on the scanner under "live data"? If so, the diagnosis can be done by measuring the voltages on the three wires on the TPS. That has to be done by back-probing the plug through the rubber seals while it's still connected.
The engine will still run, but poorly, if there's a problem with the throttle position sensor. If the cam or crank sensors fail, some models will still run on one of them. Some models will stall if either one fails. The stalling occurs because the Engine Computer will turn off the automatic shutdown (ASD) relay which removes voltage to the ignition coil(s), injectors, alternator field, oxygen sensor heaters, and fuel pump or pump relay. When that happens, you will still see residual fuel pressure at the test port but the pump won't be running AND there won't be spark.
The first thing to observe is whether you can hear the hum of the fuel pump for one second after turning on the ignition switch. If you can, the next thing is to measure the voltage on the dark green / light green wire to any ignition coil, any injector, or either small wire on the back of the alternator. Battery voltage should appear there during engine rotation, (cranking or running). If it does not show up, the first suspect on that engine would be the cam sensor. Next would be the crank sensor. Typically there will be a stored diagnostic fault code. If you're missing the signals from three sensors, look for something they have in common. In this case the only thing is their common ground return wire to the Engine Computer. There's two splices in that circuit. A corroded splice could cause an intermittent loss of all three signals. The clue is you would find 5.0 volts on all three wires to the TPS.