BlackEv03

Hey everyone, I hope this is in the right section, just had a cel, and it came up P203,(injector circit malfunction) bla bla bla, whatever that is...so it bogs down when I push in the clutch, and kills if theres any other strain on the system, turning, ac, whatever. Its all stock, but the old owner told me they had a apexi a/f controller in the car, but it was stolen. I just had it in for the 60k service, new belts, all fluids changed. Anyone have an idea what could be causing this???

BlackEv03

anyone?

evo150

iTrader: (51)

are you sure the code is p203 or p0203? this is what i found. looks to be the # 3 injector failed or bad wiring. but if you havent had any problems till now i would first check the harness.

there is a code p0201 which is for the injectors as well as p0202, p0203, p0204 depending on which injector fails. Anyway here is what the service manual says.

CIRCUIT OPERATION
• The power for the injector is supplied by the No. 4 terminal of the MFI relay via an injector resistor.
• The ECM controls the injector by turning the power transistor in the ECM "ON" and "OFF".
TECHNICAL DESCRIPTION
• The amount of fuel injected by the injector is controlled by the amount of continuity time the coil is grounded by the ECM.
• A surge voltage is generated when the injectors are driven and the current flowing to the injector coil is shut off.
• The ECM checks this surge voltage.
DTC SET CONDITIONS

Check Conditions
Engine speed is lower than 1,000 r/min.
Throttle position sensor output voltage is lower than 1.16 volts.

Judgement Criteria
• Injector coil surge voltage (battery positive voltage +2 volts) has not been detected for two seconds.
TROUBLESHOOTING HINTS (The most likely causes for this code to be set are: )
• Injector failed.
• Injector resistor failed.
• Open or shorted injector circuit, harness damage, or loose connector.
• ECM failed.

Hope this helps

BlackEv03

yeah, p0203 was it. Hmmm so injector, ECU, or the connection. Dang I need to buy a manual, wonder if Checker has them....