Code
P1714
DAEWOO
P — Powertrain
Idle speed switch
Views:
UK: 1
EN: 2
RU: 3
AI status
Completed
Completed
100%
Causes
- Faulty idle speed/idle switch (worn, stuck, or internally open)
- Damaged, corroded or disconnected wiring or connector at the idle switch
- Poor ground or power supply to the switch or ECM
- Contamination or sticking throttle plate/throttle body linkage
- Vacuum leaks or intake air leaks affecting idle control
- Faulty ECM or intermittent module input circuit
Symptoms
- Check Engine Light (MIL) illuminated
- Intermittent or unstable idle speed (surging or rough idle)
- Engine stalls at idle or when coming to a stop
- Poor idle response after throttle release
- Possible difficulty starting or erratic idle RPM
What to check
- Use a scan tool to read freeze frame and live data; monitor idle switch status and throttle position sensor (TPS) values
- Visually inspect idle switch connector and wiring for corrosion, damage, or loose pins
- Operate throttle by hand and observe switch actuation (watch live data or test light/voltmeter)
- Check for vacuum leaks and inspect throttle body for carbon buildup or sticking throttle plate
- Check for related codes (TPS, IAC, MAF, vacuum) that might point to other causes
Signal parameters
- Typical switch is a discrete on/off input to ECM — expected change in state when throttle returns to idle (closed throttle)
- Expected voltage levels: 0–5 V logic level or continuity to ground depending on manufacturer wiring — consult vehicle wiring diagram
- Signal should be stable (no rapid toggling) when throttle is stationary at idle
- Resistance across switch terminals: near 0 Ω (closed) and very high/open (open) — measure with throttle at idle and moved off idle
Diagnostic algorithm
- Read and record codes and freeze-frame data with a scan tool; note conditions when P1714 set
- Inspect harness and connector at the idle switch for corrosion, water entry, bent pins or loose terminals; repair or clean as needed
- Backprobe the switch connector and observe the signal while slowly opening and closing the throttle; confirm change of state at the specified idle position
- Measure reference voltage and switch output to ECM with a multimeter (or check continuity) and compare to expected values from wiring diagram
- Check grounds and power supply circuits for proper voltage and continuity
- Clean throttle body and ensure throttle plate moves freely; re-test switch actuation after cleaning
- If wiring and switch check OK, consider replacing the idle speed/switch assembly
- If fault persists after repair and wiring is confirmed good, suspect ECM input circuit fault and test/replace ECM as last resort
Likely causes
- Corroded/loose connector at the idle switch
- Idle switch mechanical failure (contacts open/short when closed)
- Wiring chafed or shorted to ground/power near throttle body
- Carbon buildup causing throttle plate to stick, preventing proper switch actuation
Fault status
Status
Idle speed switch circuit malfunction. ECM detected an invalid or inconsistent idle switch signal (open, short, or incorrect logic level) that prevents reliable idle detection.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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