Code
P1513
PORSCHE
P — Powertrain
Idle control valve opening coil
Views:
UK: 0
EN: 4
RU: 7
AI status
Completed
Completed
100%
Causes
- Opening coil open or shorted
- Poor or corroded connector/pins at the idle control valve
- Damaged wiring harness (chafing, broken conductor, short to ground or battery)
- Faulty idle control valve (stuck, internal coil fault)
- Blown fuse or faulty relay feeding the valve
- Faulty ECU/driver output (rare)
Symptoms
- Rough or unstable idle
- High or low idle speed, or fluctuating RPM
- Stalling at idle or during deceleration
- Check Engine Light (MIL) illuminated
- Reduced driveability until problem appears to clear
What to check
- Retrieve freeze frame data and stored freeze/related codes from ECM
- Visual inspection of valve connector, wiring and harness for damage, corrosion or pin deformation
- Check relevant fuse(s) and relays
- Measure coil resistance with multimeter at valve connector (unplugged)
- Backprobe connector with ignition on to confirm supply voltage and ECU drive signal when commanded
- Wiggle test wiring while monitoring live data or voltage for intermittent faults
Signal parameters
- Coil resistance (typical): often in the low ohm to tens of ohms range — expect a finite low resistance; consult model-specific data for exact spec
- Supply voltage: ~battery voltage (11–14.5 V) on the power feed when ignition ON
- Driver output: pulsed or switched ground from ECU when adjusting valve (verify with oscilloscope or DVOM in duty mode)
- Current draw: coil currents commonly in the 0.1–2 A range when energized (model dependent)
- No continuity (infinite resistance) indicates open coil; near-zero indicates short to ground
Diagnostic algorithm
- Read and record the code(s), freeze frame and live data. Note when fault sets (cold start, warm idle, etc.).
- Perform a thorough visual inspection of the idle control valve, connector and wiring harness for damage, corrosion, heat or pin deformation.
- With ignition OFF, disconnect the valve and measure coil resistance across the opening coil terminals. Compare to model-specific spec. Replace valve if out of spec or open/shorted.
- Check supply and ground at the valve connector with ignition ON. Verify battery feed fuse/relay continuity and that power is present at the feed pin.
- With engine running or commanded by a scan tool, backprobe the driver pin and observe voltage/pulse pattern. If no driver signal, suspect ECU or wiring. If driver is present but valve does not respond, suspect valve.
- Perform a continuity and short-to-ground/short-to-battery check from the connector to the ECU harness. Repair damaged wiring as needed.
- If intermittent, perform wiggle testing while monitoring live data or using an oscilloscope to catch breaks under movement/heat.
- If tests point to ECU driver fault (rare), confirm wiring and replace ECU only after eliminating harness and valve faults.
- After repairs, clear codes, perform relearn procedures if required by model, and road test to confirm repair. Re-check for recurrence.
Likely causes
- Corroded/loose connector at the idle control valve
- Open circuit in the coil (measured high or infinite resistance)
- Short to ground or battery in the coil circuit
- Idle control valve internal failure
Fault status
Status
Idle control valve opening coil circuit malfunction — open, short, high resistance or intermittent detected by ECM.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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