Electronically controlled fuel injector is a solenoid valve which supplies exactly calculated amount of fuel to engine for optimum conbustion under various engine load and speed. To meet air-fuel ratio required in system, ECM regulates fuel injection quantity as controlling injector solenoid operating duration referring air flow to cylinders and output signals from HO2S. For this precise control, quick response of solenoid is required and for perfect combustion, injection characteristic is important.
If there is Open in injector #1 circuit, ECM sets DTC P0201.
Item
Detecting Condition
Possible Cause
DTC Strategy
Circuit continuity check, open
Poor connection
Open or short to ground in power circuit
Open in control circuit
Injector
Enable Conditions
Engine start completed
No fuel cut off condition
Threshold Value
Open in control circuit / Open in power circuit
Diagnostic Time
Continuous
MIL ON Condition
3 driving cycle
Specification
Coil Resistance (O)
13.8 ~ 15.2 [20 ? 68 ?]
When the ECM energizes the injector by grounding the control circuit, the circuit voltage should below (theoretically 0V) and the fuel is iniected. When the ECM de-energizes the injector by opening control circuit, the fuel injector is closed and circuit voltage should be peak for a moment.