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Diagnostický případ
Opravené vozidlo
Fiesta 1,4 TDCi hard starting
16.02.2017
11314x
Informace o vozidle
| VIN: | |
| Výrobce: | Ford |
| Model: | Fiesta |
| Rok výroby: | 2004 |
| Kód motoru: | 1,4 TDCi |
| Typ motoru: | F6JA |
| Výkon (kW): | 50 kW |
| Převodovka: | Manuální |
| Palivo: | Diesel |
| Najeto: | 185 000 km |
- neukládá žádný chybový kód
Doposud provedeno bez úspěchu
The fuel supply was verified, the fuel strainer was cleaned, the fuel filter was replaced. The timing system was inspected and no problems found. Verified using the correct timing setup tools. Compression pressures OK - 32 bar. The camshaft was inspected to see if the cam lobes haven't rotated. No problem found. Even though no evident problem was found the CKP and CMP sensors were replaced with no change. Warm and repeated starts are OK. Once the engine is allowed to cool down for several hours it is hard to restart.Závěr
VOZIDLO JSEM NEOPRAVOVALAfter many testing sessions I discovered that the alternator is giving very high current during cranking. I purchased a new original Valeo voltage regulator. Since the replacement of the regulator the engine started without any problem. The customer told me afterwards, that the alternator charging system was repaired in the past and the installed regulator wasn't probably the correct type. Further the main alternator power cable is on the other side of the engine installed in the same wiring loom as the starters main power cable. The high current during cranking that is high as 130 A was causing interference of the engine ECU and as a result of this, the ECU was changing the preinjection values to a too high value.
Obrázky, fotografie a soubory
Injector detail (7384/6)
Channel numbers and colours:1 = Injector cylinder # 1 - voltage
2 = Injector cylinder # 1 - voltage
3 = Fuel injector cylinder # 1 - current
Alternator starting current (7384/10)
The alternator is mysteriously not waiting for the engine to start and is generating maximum current with ignition ON and thus is restricting the starter. The cause was the regulator that wasn't the correct part for this alternator.Soubory ke stažení
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mwfCKP & CMP sensors (7384/1).mwf Channel colours and numbers:Stáhnout soubor
1 = CMP sensor
2 = CKP sensor
3 =
4 =
Recorded: During cranking
Recording description: The synchronisation should be OK as compared with other available recordings. The only point takt I can see is that the crankshaft rotation speed is dropping.
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mwfFuel injector (7384/2).mwf Channel colours and numbers:Stáhnout soubor
1 = Fuel injector cylinder #1
2 = Fuel injector cylinder #1
3 = Fuel injector cylinder #1 - current
4 = Compression
5 = DRW valve on the fuel pump
Recorded: During engine cranking
Recording description: I am not completely confident with the injection point in relation to the cylinder compression. It is very difficulot to measure the injection point exactly but I think that fuel injection is occuring around 20 degrees before TDC.
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mwfFuel injector + fuel quantity solenoid + DRW (7384/3).mwf Channel colours and numbers:Stáhnout soubor
1 = Fuel injector cylinder #1
2 = Fuel injector cylinder #1
3 = Compression
4 = Fuel pressure sensor
5 = Fuel quantity solenoid
6 = DRW valve
Recorded: During engine cranking
Recording description: We can see that there seems to be sufficient pressure for starting a small pressure drop when the injectors open. Nevertheless I am not sure if we can determine if the injectors are giving the correct quantity.
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mwfFuel injector voltage & current + DRW valve (7384/4).mwf Channel colours and numbers:Stáhnout soubor
1 = Fuel injector cylinder #1
3 = Fuel injector cylinder #1 - current
4 = Compression
5 = Fuel pressure sensor
6 = DRW valve
Recorded: Engine cranking
Recording description: I don't know what to think about voltage impulses/spikes between the individual injections that are present on the injector wires. -
mwfNew CMP sensor (7384/5).mwf Channel colours and numbers:Stáhnout soubor
1 = CKP sensor
2 = CMP sensor
3 = Compression
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mwfAlternator after repair (7384/9).mwf Channel numbers and colours:Stáhnout soubor
1 = Alternator voltage
2 = Alternator current
3 =
4 =
Recorded: during cranking
Recording description: During cranking the alternator is rotating at no load without excitation. Charging starts gradually after the engine is started.
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