DTC P0506: Idle Control System RPM Lower Than Expected: General Description
A target idle speed that meets the engine operating conditions (coolant temperature, A/C ON or OFF, etc.) is stored in the engine control module (ECM). The ECM monitors and controls the idle speed so that the actual idle speed is equal to the target idle speed. If the actual idle speed varies beyond a specified value from the target speed over a certain period of time, the ECM detects a malfunction in the idle speed control system and a DTC is stored.
MONITOR DESCRIPTION CHART
| Execution | Under the Enable Conditions |
| Sequence | None |
| Duration | 20 seconds or more |
| DTC Type | Two drive cycles, MIL ON |
ENABLE CONDITIONS CHART
| Condition | Minimum | Maximum | ||
|---|---|---|---|---|
| Elapsed time after starting the engine | 15 seconds | - | ||
| Engine coolant temperature | 158°F (70°C) | - | ||
| Intake air temperature | 20°F (-7°C) | - | ||
| Atmospheric pressure(1) | 67 kPa (500 mmHg, 20.0 in.Hg) | - | ||
| Fuel trim | 0.65 | 1.47 | ||
| Battery voltage | 10.53 V | - | ||
| Fuel feedback | Closed loop | |||
| Throttle position | Fully closed | |||
| No active DTCs | ECM, MAP, ECT, TP, IAT, EGR, BARO, IAC, VSS, VTEC System, A/T System(1), Fuel System | |||
| Others | At idle | |||
| The engine is under no load | ||||
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