Geely EC718 2009 Workshop Manual page 262

2-180 Control System JL4G18-D
2.2.7.36 DTC P0506-P0509 P0511
1. DTC Descriptor:
DTC P0506
DTC P0507
DTC P0508
DTC P0509
DTC P0511
ECM controls the engine idle speed by regulating the IAC valve core shaft position. IAC valve's two internal coils are driven by the
stepper motors. idle air control valve's move is controlled by 4 circuits. ECM's driver controls idle air control valve two wires polarity
via these circuits. ECM commands the IAC valve stepper motor rotate clockwise or counterclockwise. IAC valve motor is connected
to the idle air control spool shaft through the driver screw. ECM sends electrical pulses to the IAC valve coils to allow the core shaft
stretch into or contract out of the throttle body channel. Through the core shaft, air flow increases, so the engine speed increases.
When the pivotal stretches, the air flow decreases, therefore the engine speed is reduced. If the engine control module detects the
engine speed is not in the expected range, the DTC codes will be set.
ECM harness connector EN01 terminals No. 21,22,35,36 are connected to IAC valve harness connector EN17 terminals B, A, C,
D.
2. Conditions For Setting DTC and The Fault Location:
DTC
DTC Detection Strategy Conditions For Setting The DTC (Control Strategy)
Code
Idle actuator stays at a
P0506
small opening position.
EC718/EC718RV EC715/EC715RV 10/2009
Controlled Idle Speed Lower Than Target Idle Speed
Controlled Idle Speed Higher Than Target Idle Speed
Stepper Motor Driver Pin Short to Ground
Stepper Motor Driver Pin Short to Power Supply
Stepper Motor Driver Pin Circuit Open
1. Static target idle speed and the actual idle speed
difference is less than 200 rpm.
2. Idle speed integral part is equal to the minimum.
3. Canister solenoid valve opening is less than 100%.
4. The engine is at idle speed.
5. The vehicle speed is equal to 0.
6. Engine coolant temperature is higher than 80.3°C
(176.5 ºF) .
7. Intake air temperature is higher than 20.3°C (68.5 ºF).
Engine
Fault Locations
1. Idle Air Control Valve
Circuit
2. Idle Speed Control
Valve
3. Intake System
4. ECM