What does fault code P0077 mean?

The control module has detected a fault in the Intake Valve Control Solenoid Circuit High (Bank 1) (P0077). 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: • Intake Valve Control Solenoid Circuit High (Bank 1) – Coil Resistance (Resistance (Ω)): 20 - 120 Ω (relay) / 8 - 40 Ω (solenoid) [Condition: Device disconnected at 20°C] • Intake Valve Control Solenoid Circuit High (Bank 1) – Supply Voltage (Voltage (V)): 11.8 - 14.4 V [Condition: Ignition ON, high side of load] • Intake Valve Control Solenoid Circuit High (Bank 1) – Control (Low Side) Rest / Active (Voltage (V)): Rest ≈ battery voltage / Active < 1.0 V [Condition: Module commanding device ON/OFF] Oscilloscope: Scope the control side as the module commands the device. Switch-off must show a clear inductive spike (60 - 300 V); no spike means an open coil or a failed driver. (Scale: 5 ms/div, 50 V/div)

What are the symptoms of fault code P0077?

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 P0077?

Most likely: Open circuit on signal wire, spread terminal pin, or short to power feed at Intake Valve Control Solenoid 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 Intake Valve Control Solenoid Circuit High (Bank 1) Possible: Internal mechanical wear or carbon deposits inside Intake Valve Control Solenoid Circuit High (Bank 1) Rare: Defective internal output driver or reference circuit in the control module for Intake Valve Control Solenoid Circuit High (Bank 1)

How do you fix fault code P0077?

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 Intake Valve Control Solenoid Circuit High (Bank 1). Check circuit continuity and ground-side voltage drop (< 0.05 V) for Intake Valve Control Solenoid Circuit High (Bank 1). Command device via scan-tool bidirectional control to verify mechanical operation and flyback spike. Mechanic tip: When an inductive relay/solenoid turns off, an inductive flyback spike (60 - 300 V) MUST appear on the scope. Absence of the spike indicates an open coil winding or an open module driver.

Standard EOBD

P0077 - Innsugsventil styresolenoid (VVT) – høyt signal (Bank 1)

Q: What are the symptoms of fault code P0077?

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 P0077?

Most likely: Open circuit on signal wire, spread terminal pin, or short to power feed at Intake Valve Control Solenoid 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 Intake Valve Control Solenoid Circuit High (Bank 1) Possible: Internal mechanical wear or carbon deposits inside Intake Valve Control Solenoid Circuit High (Bank 1) Rare: Defective internal output driver or reference circuit in the control module for Intake Valve Control Solenoid Circuit High (Bank 1)

Q: How do you fix fault code P0077?

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 Intake Valve Control Solenoid Circuit High (Bank 1). Check circuit continuity and ground-side voltage drop (< 0.05 V) for Intake Valve Control Solenoid Circuit High (Bank 1). Command device via scan-tool bidirectional control to verify mechanical operation and flyback spike. Mechanic tip: When an inductive relay/solenoid turns off, an inductive flyback spike (60 - 300 V) MUST appear on the scope. Absence of the spike indicates an open coil winding or an open module driver.

Relatert:Innsugsventil styresolenoid (VVT), Ledningsnett og kontakter, Styreenhet (ECM/PCM)

System

Drivlinje (Motor og girkasse)

Kontakt oss Finn reparasjon

Teknisk beskrivelse

Styreenheten registrerer en feil i Innsugsventil styresolenoid (VVT) (P0077). 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
Innsugsventil styresolenoid (VVT) – spolemotstand	Motstand (Ω)	20 - 120 Ω / 8 - 40 Ω	Frakoblet ved 20°C
Innsugsventil styresolenoid (VVT) – matespenning	Spenning (V)	11.8 - 14.4 V	Tenning PÅ

Innsugsventil styresolenoid (VVT) – spolemotstandMotstand (Ω)

Børverdi:20 - 120 Ω / 8 - 40 Ω

Frakoblet ved 20°C

Innsugsventil styresolenoid (VVT) – matespenningSpenning (V)

Børverdi:11.8 - 14.4 V

Tenning PÅ

Oscilloskop Kurveformanalyse

5 ms/div, 50 V/div

Mål styresiden når modulen aktiverer; tydelig induktiv spenningstopp ved frakobling.

Mulige årsaker

Brudd i signalledningen, løst kontaktpunkt eller kortslutning til pluss ved Innsugsventil styresolenoid (VVT)

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

Gnagd eller klemt ledningsnett fram til Innsugsventil styresolenoid (VVT)

Mekanisk slitasje eller sotbelegg i Innsugsventil styresolenoid (VVT)

Defekt driver eller referanseutgang i styreenheten for Innsugsventil styresolenoid (VVT)

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 Innsugsventil styresolenoid (VVT).

Mål kontinuitet og jordspenningsfall (< 0.05 V) for Innsugsventil styresolenoid (VVT).

Aktiver komponenten med aktuatortest for å bekrefte funksjon og flyback-spiss.

Mekanikerens tips

Ved utkobling må det oppstå en induktiv spenningstopp (60 - 300 V). Uteblir toppen er spolen eller driveren defekt.

Relaterte feilkoder

P002B

'B' Kamprofilstyring (VVL) – lavt signal (Bank 1)

P00A9

Innsugslufttemperatursensor (IAT) sensor '2' – periodisk / ustabil signal (Bank 2)

P00AF

Ladetrykksmodul A – urimelig verdi

P00B8

MAP - Luftmassemåler (MAF) korrelasjonsfeil (Bank 2)

Målepunkt / Komponent

Måletype

Nominelt Målområde

Målevilkår

Innsugsventil styresolenoid (VVT) – spolemotstand

Motstand (Ω)

20 - 120 Ω / 8 - 40 Ω

Frakoblet ved 20°C

Innsugsventil styresolenoid (VVT) – matespenning

Spenning (V)

11.8 - 14.4 V

Tenning PÅ