What does fault code P0193 mean?

The control module has detected a fault in the Fuel Rail Pressure Sensor Circuit High (Bank 1) (P0193). The signal is above the upper threshold, typically from an open circuit, poor connection, or a short to battery voltage. Affects cylinder bank 1 (bank 1 containing cylinder 1, firewall/right side). Measurements: • Fuel Rail Pressure Sensor Circuit High (Bank 1) – Signal Voltage (Voltage (V)): > 4.80 V (fault state) [Condition: Ignition ON, connector engaged] • 5 V Reference Voltage (Voltage (V)): 4.95 - 5.05 V [Condition: Ignition ON at sensor connector] • Sensor Ground Voltage Drop (Voltage (V)): < 0.05 V (< 50 mV) [Condition: Under load to chassis ground] • Signal Wire Continuity (Resistance (Ω)): < 0.5 Ω (Open = OL) [Condition: Disconnected harness between sensor and ECM] Oscilloscope: Capture the Fuel Rail Pressure Sensor Circuit High (Bank 1) signal through a slow sweep of its operating range. The trace must be smooth with no dropouts to 0 V or 5 V. (Scale: 100 ms/div, 1 V/div)

What are the symptoms of fault code P0193?

Sensor signal is pegged at the upper voltage limit (5 V / supply rail) Check Engine Light (MIL) illuminated Possible drivability or power reduction Risk of failing an emissions inspection

What causes fault code P0193?

Most likely: Open circuit on signal wire, spread terminal pin, or short to power feed at Fuel Rail Pressure Sensor Circuit High (Bank 1) Bank 1 specific: Inspect wiring harness to cylinder bank 1 (firewall/right bank, exposed to exhaust manifold heat). Likely: Chafed or pinched wiring harness along the signal path to Fuel Rail Pressure Sensor Circuit High (Bank 1) Likely: Poor ground connection or excessive voltage drop (> 0.1 V) at the ground point for Fuel Rail Pressure Sensor Circuit High (Bank 1) Rare: Defective internal output driver or reference circuit in the control module for Fuel Rail Pressure Sensor Circuit High (Bank 1)

How do you fix fault code P0193?

Cross-swap the component on Bank 1 with Bank 2 to rule out mechanical oil passages and internal timing wear. Measure signal terminal voltage with ignition ON and sensor unplugged to determine if ECM pull-up is active or harness is shorted to 12V. Verify loaded supply voltage and harness terminal pins at Fuel Rail Pressure Sensor Circuit High (Bank 1). Check circuit continuity and ground-side voltage drop (< 0.05 V) for Fuel Rail Pressure Sensor Circuit High (Bank 1). Unplug the sensor: the signal must swing to a known rail. Replace the sensor or repair the wiring based on the result. Mechanic tip: Always run a loaded voltage-drop test on the sensor ground with ignition ON. A drop above 0.1 V shifts the whole signal and tricks the module into setting sensor codes on a good sensor.

Standard EOBD

P0193 - drivstoff rail-trykksensor – høyt signal (Bank 1)

Q: What are the symptoms of fault code P0193?

Sensor signal is pegged at the upper voltage limit (5 V / supply rail) Check Engine Light (MIL) illuminated Possible drivability or power reduction Risk of failing an emissions inspection

Q: What causes fault code P0193?

Most likely: Open circuit on signal wire, spread terminal pin, or short to power feed at Fuel Rail Pressure Sensor Circuit High (Bank 1) Bank 1 specific: Inspect wiring harness to cylinder bank 1 (firewall/right bank, exposed to exhaust manifold heat). Likely: Chafed or pinched wiring harness along the signal path to Fuel Rail Pressure Sensor Circuit High (Bank 1) Likely: Poor ground connection or excessive voltage drop (> 0.1 V) at the ground point for Fuel Rail Pressure Sensor Circuit High (Bank 1) Rare: Defective internal output driver or reference circuit in the control module for Fuel Rail Pressure Sensor Circuit High (Bank 1)

Relatert:drivstoff rail-trykksensor, Ledningsnett og kontakter, Styreenhet (ECM/PCM)

System

Drivlinje (Motor og girkasse)

Kontakt oss Finn reparasjon

Teknisk beskrivelse

Styreenheten registrerer en feil i drivstoff rail-trykksensor (P0193). Signalet ligger over øvre terskel, som regel på grunn av brudd, dårlig kontakt eller kortslutning mot spenning. Gjelder sylinderbank 1 (bank 1 med sylinder 1).

Multimeter Målepunkter & Nominelle Verdier

Målepunkt / Komponent	Måletype	Nominelt Målområde	Målevilkår
drivstoff rail-trykksensor – signalspenning	Spenning (V)	> 4.80 V (ved feil)	Tenning PÅ, kontakt tilkoblet
5 V referansespenning	Spenning (V)	4.95 - 5.05 V	Tenning PÅ ved sensorkontakt
Sensorjord spenningsfall	Spenning (V)	< 0.05 V	Under belastning mot gods

drivstoff rail-trykksensor – signalspenningSpenning (V)

Børverdi:> 4.80 V (ved feil)

Tenning PÅ, kontakt tilkoblet

5 V referansespenningSpenning (V)

Børverdi:4.95 - 5.05 V

Tenning PÅ ved sensorkontakt

Sensorjord spenningsfallSpenning (V)

Børverdi:< 0.05 V

Under belastning mot gods

Oscilloskop Kurveformanalyse

100 ms/div, 1 V/div

Registrer signalspenningen fra drivstoff rail-trykksensor gjennom hele arbeidsområdet; jevn kurve uten hopp til 0 V eller 5 V.

Mulige årsaker

Brudd i signalledningen, løst kontaktpunkt eller kortslutning til pluss ved drivstoff rail-trykksensor

Bank 1:Kontroller ledningsnettet til sylinderbank 1 (mot torpedovegg).

Gnagd eller klemt ledningsnett fram til drivstoff rail-trykksensor

Dårlig jordforbindelse eller spenningsfall (> 0.1 V) for drivstoff rail-trykksensor

Defekt driver eller referanseutgang i styreenheten for drivstoff rail-trykksensor

Symptomer

Sensorsignalet ligger låst ved øvre spenningsgrense (5 V / matespenning)

Motorlampe (MIL) lyser

Mulig redusert kjørbarhet eller effekt

Risiko for underkjent EU-kontroll

Anbefalt tiltak

Bytt om komponenten mellom Bank 1 og Bank 2 for å bekrefte feilen før ny del bestilles.

Mål signalspenning med tenning PÅ og frakoblet sensor for å skille ECM pull-up fra kortslutning til 12V.

Sjekk matespenning og kontaktstykke ved drivstoff rail-trykksensor.

Mål kontinuitet og jordspenningsfall (< 0.05 V) for drivstoff rail-trykksensor.

Koble fra sensoren og se om signalet går til kjent endeverdi; bytt sensor eller reparer ledning.

Mekanikerens tips

Mål alltid spenningsfall på sensorens jord under belastning. Et fall over 0,1 V forskyver signalet og gir falske sensorkoder.

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Relaterte feilkoder

P010A

Luftmassemåler (MAF) B krets

P012A

Turbolader Inlet trykksensor 'A' krets

P010F

Luftmassemåler (MAF) A/'B' korrelasjonsfeil

P010C

Luftmassemåler (MAF) B – lavt signal

Målepunkt / Komponent

Måletype

Nominelt Målområde

Målevilkår

drivstoff rail-trykksensor – signalspenning

Spenning (V)

> 4.80 V (ved feil)

Tenning PÅ, kontakt tilkoblet

5 V referansespenning

Spenning (V)

4.95 - 5.05 V

Tenning PÅ ved sensorkontakt

Sensorjord spenningsfall

Spenning (V)

< 0.05 V

Under belastning mot gods