What does fault code P0197 mean?

The control module has detected a fault in the Engine Oil Temperature Sensor Sensor 'A'' Circuit Low (P0197). The signal is below the lower threshold, typically from a short to ground or an internally shorted sensor. Measurements: • Engine Oil Temperature Sensor Sensor 'A'' Circuit Low – Signal Voltage (Voltage (V)): < 0.20 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 Engine Oil Temperature Sensor Sensor 'A'' Circuit Low 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 P0197?

Sensor signal is pegged at the lower voltage limit (0 V / ground) Check Engine Light (MIL) illuminated Possible drivability or power reduction Risk of failing an emissions inspection

What causes fault code P0197?

Most likely: Short to ground on the signal wire or an internal short circuit within Engine Oil Temperature Sensor Sensor 'A'' Circuit Low Channel A: Verify dedicated wiring pins and signal pair for circuit A against the schematic. Likely: Chafed or pinched wiring harness along the signal path to Engine Oil Temperature Sensor Sensor 'A'' Circuit Low Likely: Poor ground connection or excessive voltage drop (> 0.1 V) at the ground point for Engine Oil Temperature Sensor Sensor 'A'' Circuit Low Rare: Defective internal output driver or reference circuit in the control module for Engine Oil Temperature Sensor Sensor 'A'' Circuit Low

How do you fix fault code P0197?

Compare signal voltage and resistance between circuit A and companion circuit B at module connector. Measure signal wire resistance to chassis ground with connector unplugged (must exceed 10 kΩ; low reading confirms short to ground). Verify loaded supply voltage and harness terminal pins at Engine Oil Temperature Sensor Sensor 'A'' Circuit Low. Check circuit continuity and ground-side voltage drop (< 0.05 V) for Engine Oil Temperature Sensor Sensor 'A'' Circuit Low. 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

P0197 - Motoroljetemperatursensor sensor 'A'' – lavt signal

Q: What are the symptoms of fault code P0197?

Sensor signal is pegged at the lower voltage limit (0 V / ground) Check Engine Light (MIL) illuminated Possible drivability or power reduction Risk of failing an emissions inspection

Q: What causes fault code P0197?

Most likely: Short to ground on the signal wire or an internal short circuit within Engine Oil Temperature Sensor Sensor 'A'' Circuit Low Channel A: Verify dedicated wiring pins and signal pair for circuit A against the schematic. Likely: Chafed or pinched wiring harness along the signal path to Engine Oil Temperature Sensor Sensor 'A'' Circuit Low Likely: Poor ground connection or excessive voltage drop (> 0.1 V) at the ground point for Engine Oil Temperature Sensor Sensor 'A'' Circuit Low Rare: Defective internal output driver or reference circuit in the control module for Engine Oil Temperature Sensor Sensor 'A'' Circuit Low

Relatert:Motoroljetemperatursensor sensor 'A'', Ledningsnett og kontakter, Styreenhet (ECM/PCM)

System

Drivlinje (Motor og girkasse)

Kontakt oss Finn reparasjon

Teknisk beskrivelse

Styreenheten registrerer en feil i Motoroljetemperatursensor sensor 'A'' (P0197). Signalet ligger under nedre terskel, som regel på grunn av kortslutning mot jord eller en internt kortsluttet sensor.

Multimeter Målepunkter & Nominelle Verdier

Målepunkt / Komponent	Måletype	Nominelt Målområde	Målevilkår
Motoroljetemperatursensor sensor 'A'' – signalspenning	Spenning (V)	< 0.20 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

Motoroljetemperatursensor sensor 'A'' – signalspenningSpenning (V)

Børverdi:< 0.20 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 Motoroljetemperatursensor sensor 'A'' gjennom hele arbeidsområdet; jevn kurve uten hopp til 0 V eller 5 V.

Mulige årsaker

Kortslutning til jord i signalledningen eller internt i Motoroljetemperatursensor sensor 'A''

Kanal A:Sjekk dedikert ledningspar for kanal A i modulkontakten.

Gnagd eller klemt ledningsnett fram til Motoroljetemperatursensor sensor 'A''

Dårlig jordforbindelse eller spenningsfall (> 0.1 V) for Motoroljetemperatursensor sensor 'A''

Defekt driver eller referanseutgang i styreenheten for Motoroljetemperatursensor sensor 'A''

Symptomer

Sensorsignalet ligger låst ved nedre spenningsgrense (0 V / jord)

Motorlampe (MIL) lyser

Mulig redusert kjørbarhet eller effekt

Risiko for underkjent EU-kontroll

Anbefalt tiltak

Sammenlign måleverdier mellom krets A og krets B.

Mål signalens motstand mot jord frakoblet (> 10 kΩ; lav motstand bekrefter kortslutning til jord).

Sjekk matespenning og kontaktstykke ved Motoroljetemperatursensor sensor 'A''.

Mål kontinuitet og jordspenningsfall (< 0.05 V) for Motoroljetemperatursensor sensor 'A''.

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.

Vanlige kombinasjoner

P0196

P0197

P0198

P0196, P0197, P0198 VW 2.0 TDI EA288 – Oljenivå & Oljetemperaturgivare G266 Teknisk Feilsøkingsguide

VOLKSWAGEN • 124 analyser

Vis alle diagnostiske kombinasjoner

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

Motoroljetemperatursensor sensor 'A'' – signalspenning

Spenning (V)

< 0.20 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