Code
P1607
DAEWOO
P — Powertrain
Vacuum solenoid v/v - stuck
Views:
UK: 4
EN: 9
RU: 15
AI status
Completed
Completed
100%
Causes
- Vacuum solenoid valve mechanically seized or internal contamination
- Solenoid coil open or shorted
- Broken, corroded or loose electrical connector or wiring (open, short to ground or battery)
- Blocked, collapsed or disconnected vacuum/hoses or ports
- Vacuum source failure (pump or manifold vacuum low)
- Contaminants (oil, carbon, debris) inside valve or vacuum lines
Symptoms
- Check Engine Light (MIL) illuminated and P1607 stored
- Related system faults: rough idle, hesitation or poor drivability if valve affects intake/EGR/boost
- Reduced fuel economy
- Unusual vacuum-related behavior (failed purge, reduced boost, hard starting)
- Audible clicking absent when solenoid commanded (if normally audible)
What to check
- Read and record freeze-frame and related stored codes with a scan tool; verify P1607 is current
- Visually inspect vacuum solenoid, hoses and connections for damage, kinks, blockages or contamination
- Inspect the electrical connector for corrosion, bent pins, water intrusion or poor mating
- Command the solenoid ON/OFF with a scan tool and listen for operation (click) while monitoring live data
- Measure solenoid coil resistance with a multimeter and compare to manufacturer specification
- Check for proper supply voltage at the solenoid connector (battery voltage) and switching to ground when commanded
Signal parameters
- Control signal: ECU command typically switches solenoid between 0 V and battery voltage or applies PWM (duty cycle control)
- Coil resistance: varies by part — commonly in the order of 10–50 ohms (check service spec for exact value)
- Supply voltage at rest: ~12 V (battery) at one terminal, switching to ground when commanded
- Expected audible/physical response: click or movement when energized
- Vacuum hold/permeability: valve should hold vacuum when closed and pass vacuum when opened
- Response time: milliseconds to tens of milliseconds (varies by design)
Diagnostic algorithm
- Retrieve DTCs and freeze-frame data; note when fault occurs and any related codes (EVAP, EGR, boost).
- Perform a careful visual inspection of the solenoid, mounting, vacuum hoses and electrical connector. Repair visible damage.
- With ignition ON (engine off) command the solenoid ON/OFF via a scan tool and observe for clicking or change in live-data parameter. If it clicks, issue may be mechanical downstream (hose/port).
- Disconnect connector and inspect pins; check for continuity to ECU connector and for voltage supply (battery) at the power terminal with ignition ON.
- Measure coil resistance across solenoid terminals. Compare to service spec. Infinite or very high resistance indicates open coil; near zero indicates short.
- Carefully apply fused 12 V directly to the solenoid coil (bench/vehicle) to verify movement. Do not leave battery voltage applied long-term. If solenoid does not move, replace it.
- While commanding solenoid closed, apply vacuum downstream and verify it holds vacuum; when commanded open it should pass vacuum. Replace if it leaks or is stuck.
- Inspect and, if needed, replace or clean hoses and check vacuum source (manifold vacuum or pump). Repair leaks found by smoke test or visual inspection.
- If electrical control is present as PWM, verify waveform with an oscilloscope. If ECU is not commanding correctly but wiring and solenoid are good, suspect ECU or control module fault.
- After repair or replacement, clear codes, perform relearn (if required), and test-drive to confirm the fault does not return.
Likely causes
- Stuck or contaminated solenoid valve
- Wiring/connector fault to the solenoid
- Blocked vacuum hose or failed vacuum source
- Failed solenoid coil
Fault status
Status
Control module has detected the vacuum solenoid valve is stuck or not changing state when commanded. Check solenoid mechanical operation, vacuum lines and electrical control.
Repair difficulty: Medium
Diagnostic time: 0.5-2.5 hours
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