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VOLKSWAGEN
P0321
P0322
P0300

P0321 P0322 P0300 VW – Engine Speed Crankshaft Sensor G28 Diagnostics

Priorytet diagnostyczny: Wysoki
Stopień złożoności: Zaawansowany

Diagnostic guide for P0321, P0322, and P0300 on Volkswagen engines. Crankshaft speed sensor G28 thermal failure, engine stalling, and no-signal diagnostics.

Pojazd

VOLKSWAGEN

Kody

3 sterowników

Typ analizy

Ekspert techniczny

Status

Przeanalizowano

Analiza techniczna

REF: #3DAC0E

The combination of P0321, P0322, and P0300 indicates thermal breakdown of the crankshaft speed sensor G28 on VAG engines, cutting ignition and fuel delivery.

Oczekiwane objawy

Check engine light illuminated with sudden boost drop under hard acceleration on VOLKSWAGEN (DTCs: P0321, P0322, P0300)
Rough idle and sluggish throttle pickup from a dead stop
Misfiring and hesitation during high-speed highway overtaking (2,500–3,500 RPM)

Wpływ na układ

Układ napędowy
Sterowanie silnikiem
Układ oczyszczania spalin

Potencjalne przyczyny usterki

01Sticking electronic wastegate actuator or heavy carbon buildup on intake valves (affecting VOLKSWAGEN subsystem for P0321, P0322, P0300)
02Boost control solenoid N75 leakage or split charge air hose
03Ruptured diaphragm in PCV oil separator assembly (logged fault: P0321)

Procedura diagnostyczna

01

Verify supply voltage and sensor telemetry for P0321, P0322, P0300 on VOLKSWAGEN with multimeter at key ON.

02

Measure wastegate position feedback voltage at key ON: normal 3.5–3.9 V in closed position.

03

Smoke-test induction system and boost plumbing at 1.2 bar to pinpoint leaks.

04

Check crankcase depression with digital manometer at warm idle (-100 to -150 mbar).

Live Data & Mätvärdestoleranser (Är/Bör-värden)

Fabriksgodkända referensvärden vid diagnos och live-avläsning

Mätvärdesblock
Parameter / SignalTestvillkorBör-värde (Normalt)Avvikelse / Varning
GivarreferensspänningTändning på4.95 – 5.05 V< 4.75 V (Kortslutning/Spänningsfall)
Signalretur tomgångDriftstemperaturInom fabriksintervall ±5%Signalkorruption el avbrott

Ocena i zalecenia naprawcze

Rekomendacja techniczna

Install a new genuine crankshaft position sensor (G28) and secure wiring harness with heat shielding. Clear DTCs.

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Vanliga frågor om dessa felkoder

Vad är den primära orsaken till felkoderna?

The combination of P0321, P0322, and P0300 indicates thermal breakdown of the crankshaft speed sensor G28 on VAG engines, cutting ignition and fuel delivery.

Kan man köra vidare med tänd motorlampa / varningslampa?

Körning med aktiva felkoder kan leda till strypt motoreffekt (nödläge / Limp Home), blockerad partikelfilterregenerering eller följdskador på mekaniska komponenter. Felsökning bör genomföras omgående.

Hur åtgärdas kombinationen på säkrast sätt?

Install a new genuine crankshaft position sensor (G28) and secure wiring harness with heat shielding. Clear DTCs.