The Gasoline Direct Injection (GDI) system injects high pressure fuel directly into the combustion chamber. The high pressure injectors have an internal swirl disk which rotates with fuel flow to help atomize the discharging fuel. This causes the fuel to evaporate rapidly, which reduces inlet air temperature. This cooler atomized air/fuel inlet charge increases power output.
GDI injector drive has 2 circuits for high side. One handles cylinder 1&4 and another handles cylinder 2&3, so that these paired cylinders always occur same DTC.
ECU shows P2149 when the 2,3 high or low side is short circuit ground or short circuit battery.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
Electrical Check | 1. Checking high and low side wiring from PCU |
Enable Conditions |
•
Time after fuel cut off elapsed 3 sec over | |
Threshold Value |
•
PCU power stage diagnosis high side & low side short circuit ground, short circuit battery | |
Diagnostic Time |
•
4 sec. | |
Mil On Condition |
•
Two trips |
- Normal signal at the HIGH SIDE terminal(HS_23)
- Power supply to No.2 & No.3 injectors
- Normal signal at the LOW SIDE terminal(LS_2)
- No.2 injector not working
- Normal signal at the LOW SIDE terminal(LS_3)
- No.3 injector working
Normal operating signal of ECU HS_23, LS_2 and LS_3 during Cyl. 2 Injection
※ PCM's HIGH SIDE control circuit(HS_14) is connected to No.1 and No.4 injectors together and PCM's HIGH SIDE control circuit(HS_23) is connected to No.2 and No.3 injectors together.
