Code
P1143
DAEWOO
P — Powertrain
FEED BACK SOL V/V MAL
Views:
UK: 1
EN: 3
RU: 3
AI status
Completed
Completed
100%
Causes
- Open or short in solenoid wiring or connector
- Corroded/damaged electrical connector or poor pin contact
- Failed/shorted/grounded solenoid valve coil
- Blocked or mechanically stuck solenoid or associated vacuum/air passage
- Faulty ECM or poor ECM ground
- Intermittent harness damage (chafing, heat, rodent)
Symptoms
- Check Engine Light (MIL) illuminated
- Rough idle or unstable idle speed
- Reduced engine performance, hesitation or stumble under load
- Increased emissions or failed emissions test
- Stalling at idle or poor starting (in some cases)
What to check
- Read and record freeze frame and all stored codes with a capable scanner
- Visually inspect solenoid, connector and wiring for damage, corrosion or disconnection
- Back-probe solenoid connector with ignition on and observe commanded signal using scan tool
- Measure solenoid coil resistance with ohmmeter and compare to service spec
- Check for proper supply voltage and ground at connector when commanded
- Inspect related vacuum/air lines and passages for blockages or leaks
Signal parameters
- Coil resistance: typically tens of ohms (consult vehicle service manual for exact spec)
- Control signal: battery voltage when commanded ON or PWM/duty-cycle drive from ECM
- Expected behavior: circuit shows continuity when unpowered; voltage present at terminal when ECM commands ON
- Response: solenoid should actuate quickly when energized (milliseconds-to-seconds)
Diagnostic algorithm
- Connect a diagnostic scanner and confirm P1143 and any related codes; note freeze-frame data
- Perform a visual inspection of the solenoid, harness and connector for obvious faults
- Measure coil resistance at the solenoid; if open or out of spec, replace solenoid
- With connector attached, back-probe power and ground terminals: verify battery voltage and solid ground
- Command the solenoid ON with a scan tool while monitoring voltage/waveform; if control signal present but valve does not actuate, replace valve
- If no control signal present, trace wiring back to ECM: check for open/short, corrosion, or poor grounds; repair wiring as needed
- If wiring and solenoid check good but code persists, test/replace ECM only after confirming all external circuits are good
- Clear codes and test drive to confirm repair; re-scan to ensure P1143 does not return
Likely causes
- Defective feedback solenoid valve
- Broken or corroded connector pins at the solenoid
- Open circuit or short to ground/power in harness to solenoid
- Clogged or stuck valve from carbon or debris
- Poor ground at engine/ECM causing false detection
Fault status
Status
Malfunction detected in feedback solenoid valve circuit or solenoid. ECM unable to verify correct operation of the feedback/control solenoid; may affect emissions control and engine operation.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email