P0507 - Idle Air Control System RPM Higher Than Expected
System
Powertrain (Engine & Gearbox)
Technical Description
The control module has detected a fault in the Idle Air Control System RPM Higher Than Expected (P0507).
Multimeter Test Points & Nominal Values
| Test Point / Component | Measurement | Nominal Target Range | Test Condition |
|---|---|---|---|
| Idle Air Control System RPM Higher Than Expected – Coil Resistance | Resistance (Ω) | 3 - 30 Ω (typical) | Connector disconnected at 20°C |
| Idle Air Control System RPM Higher Than Expected – Duty Cycle | PWM (%) | 5 - 95 % (modulates with target) | Engine running, actuator in control |
| Idle Air Control System RPM Higher Than Expected – Supply Voltage | Voltage (V) | 11.8 - 14.4 V | Ignition ON at connector |
Connector disconnected at 20°C
Engine running, actuator in control
Ignition ON at connector
Oscilloscope Waveform Analysis
2 ms/div, 20 V/divPossible Causes
Chafed or pinched wiring harness along the signal path to Idle Air Control System RPM Higher Than Expected
Internal mechanical wear or carbon deposits inside Idle Air Control System RPM Higher Than Expected
Defective internal output driver or reference circuit in the control module for Idle Air Control System RPM Higher Than Expected
Symptoms
4
Recommended Solution
Inspect and clean delivery passages for carbon buildup and measure differential flow pressure.
Verify loaded supply voltage and harness terminal pins at Idle Air Control System RPM Higher Than Expected.
Check circuit continuity and ground-side voltage drop (< 0.05 V) for Idle Air Control System RPM Higher Than Expected.
Check supply and the low-side driver at the ECM connector. Replace the actuator or repair the circuit based on the readings.
Mechanic's Tip
Use the scan-tool output test with the scope on the control side at the same time. If duty changes but the actuator does not move, the valve is stuck — not the electrical fault you were chasing.
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