DTC Advanced Diagnostics: P0507 (K20C1) - Honda Civic FC/FK 2016-2021

DTC Advanced Diagnostics: P0507

DTC P0507:Idle Control System RPM Higher Than Expected

General Description

The idle speed control system matches desired and current engine idle speed. Therefore, an integral action controller is used. In case of a permanent difference between desired and current engine idle speed, the diagnosis checks if this difference is out of a calibrated range with the integral action controller. If current engine speed deviation occurs, the powertrain control module (PCM) detects a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type

Execution	Continuous
Sequence	None
Duration	8 seconds or more
DTC Type	Two drive cycles, MIL on

Enable Conditions

Condition	Minimum	Maximum
Engine coolant temperature [ECT Sensor 1]	-4.5 °F (-20.3 °C)	289.85 °F (143.25 °C)
Intake air temperature [IAT Sensor (1)]	-23.4 °F (-30.8 °C)	–
Other	Vehicle speed [Vehicle Speed] is at 0 mph (0 km/h)

[ ]: HDS Parameter

Malfunction Threshold

The set point idle speed minus the current idle speed is less than -200 rpm.

Possible Cause

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.

	Throttle body air leak
	Intake manifold air leak
	Intake air system air leak
	Evaporative emission (EVAP) system air leak
	EVAP system failure
	PCM internal circuit failure

Confirmation Procedure

Operating Condition

1.	Start the engine. Hold the engine speed [Engine Speed] at 3,000 rpm without load (in neutral) until the radiator fan comes on.
2.	Let the engine idle for a while.

Diagnosis Details

Conditions for setting the DTC

When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the PCM memory. If the malfunction returns in the next (second) drive cycle, the MIL comes on and a Confirmed DTC and the freeze data are stored.

Conditions for clearing the DTC

The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command.