What does fault code P0342 mean?

The control module has detected a fault in the Camshaft Position Sensor (CMP) 'A' Circuit Low (Bank 1 or Single Sensor) (P0342). The signal is below the lower threshold, typically from a short to ground or an internally shorted sensor. Affects cylinder bank 1 (bank 1 containing cylinder 1, firewall/right side). Measurements: • Camshaft Position Sensor (CMP) 'A' Circuit Low (Bank 1 or Single Sensor) – Coil Resistance (Resistance (Ω)): 200 - 1800 Ω (typically 500 - 1200 Ω) [Condition: Sensor disconnected at 20°C] • Camshaft Position Sensor (CMP) 'A' Circuit Low (Bank 1 or Single Sensor) – Output (AC Voltage) (Voltage (V)): 0.5 - 2.0 V AC at cranking, rising with RPM [Condition: During cranking / engine running] • Insulation Resistance to Ground (Resistance (MΩ)): > 20 MΩ [Condition: Sensor pin to chassis ground] Oscilloscope: Scope the output during cranking and revving. The waveform must be a clean sine of even amplitude; a missing reluctor tooth shows as a brief amplitude dip once per revolution. (Scale: 2 ms/div, 2 V/div)

What are the symptoms of fault code P0342?

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 P0342?

Most likely: Short to ground on the signal wire or an internal short circuit within Camshaft Position Sensor (CMP) 'A' Circuit Low (Bank 1 or Single Sensor) Bank 1 specific: Inspect wiring harness to cylinder bank 1 (firewall/right bank, exposed to exhaust manifold heat). 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 Camshaft Position Sensor (CMP) 'A' Circuit Low (Bank 1 or Single Sensor) Likely: Poor ground connection or excessive voltage drop (> 0.1 V) at the ground point for Camshaft Position Sensor (CMP) 'A' Circuit Low (Bank 1 or Single Sensor) Rare: Defective internal output driver or reference circuit in the control module for Camshaft Position Sensor (CMP) 'A' Circuit Low (Bank 1 or Single Sensor)

How do you fix fault code P0342?

Compare signal voltage and resistance between circuit A and companion circuit B at module connector. Cross-swap the component on Bank 1 with Bank 2 to rule out mechanical oil passages and internal timing wear. 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 Camshaft Position Sensor (CMP) 'A' Circuit Low (Bank 1 or Single Sensor). Check circuit continuity and ground-side voltage drop (< 0.05 V) for Camshaft Position Sensor (CMP) 'A' Circuit Low (Bank 1 or Single Sensor). Scope the signal trace during cranking to verify symmetric sine peaks without missing or deformed teeth. Mechanic tip: Inductive VR sensors often test fine cold but develop an open circuit when engine heat expands the internal fine windings. Gently warm the sensor with a heat gun while monitoring resistance to expose thermal open circuits.

Standard EOBD

P0342 - Kamakselsensor (CMP) 'A' – lavt signal (Bank 1 eller enkeltsensor)

Relatert:Kamakselsensor (CMP) 'A', Ledningsnett og kontakter, Styreenhet (ECM/PCM)

System

Drivlinje (Motor og girkasse)

Kontakt oss Finn reparasjon

Teknisk beskrivelse

Styreenheten registrerer en feil i Kamakselsensor (CMP) 'A' (P0342). Signalet ligger under nedre terskel, som regel på grunn av kortslutning mot jord eller en internt kortsluttet sensor. Gjelder sylinderbank 1 (bank 1 med sylinder 1).

Multimeter Målepunkter & Nominelle Verdier

Målepunkt / Komponent	Måletype	Nominelt Målområde	Målevilkår
Kamakselsensor (CMP) 'A' – spolemotstand	Motstand (Ω)	200 - 1800 Ω	Frakoblet sensor ved 20°C
Kamakselsensor (CMP) 'A' – utsignal (vekselspenning)	Spenning (V)	0.5 - 2.0 V AC ved start	Under start

Kamakselsensor (CMP) 'A' – spolemotstandMotstand (Ω)

Børverdi:200 - 1800 Ω

Frakoblet sensor ved 20°C

Kamakselsensor (CMP) 'A' – utsignal (vekselspenning)Spenning (V)

Børverdi:0.5 - 2.0 V AC ved start

Under start

Oscilloskop Kurveformanalyse

2 ms/div, 2 V/div

Mål utsignalet under start og turtallsøkning; ren sinus med jevn amplitude.

Mulige årsaker

Kortslutning til jord i signalledningen eller internt i Kamakselsensor (CMP) 'A'

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

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

Gnagd eller klemt ledningsnett fram til Kamakselsensor (CMP) 'A'

Dårlig jordforbindelse eller spenningsfall (> 0.1 V) for Kamakselsensor (CMP) 'A'

Defekt driver eller referanseutgang i styreenheten for Kamakselsensor (CMP) '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.

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

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

Sjekk matespenning og kontaktstykke ved Kamakselsensor (CMP) 'A'.

Mål kontinuitet og jordspenningsfall (< 0.05 V) for Kamakselsensor (CMP) 'A'.

Oscilloskopmål signalet for å kontrollere jevn sinuskurve.

Mekanikerens tips

Induktive sensorer kan virke kald, men få brudd ved varm motor. Varm opp sensoren forsiktig for å avdekke termisk brudd.

Relaterte feilkoder

P0379

overvåket krets eller komponent (urimelig verdi / ytelsesproblem)

P0392

Kamakselsensor (CMP) 'B' – lavt signal (Bank 2)

P0318

Rough Road sensor 'A'' Signal krets

P0332

Bankesensor '2' – lavt signal (Bank 2)

Målepunkt / Komponent

Måletype

Nominelt Målområde

Målevilkår

Kamakselsensor (CMP) 'A' – spolemotstand

Motstand (Ω)

200 - 1800 Ω

Frakoblet sensor ved 20°C

Kamakselsensor (CMP) 'A' – utsignal (vekselspenning)

Spenning (V)

0.5 - 2.0 V AC ved start

Under start