z4 swap/code 43,45 help

[ride_child]

so i just finished my z4 swap and started my car up and it started fine. drove nice but did have a cel. once it was warmed up i tried a couple of hard pulls and i was hit fuel/boost cut around 8 psi i think. went to work for 3 or so hours and came back out to go home, its about 35 to 40 degrees up here, and the car is very hard to start and keep idling, i had to give it a bit of gas to get it to idle. even then the idle is extremely rough. i check the codes (black connecters) and it gave me code 45 for the map. i find this a little weird because it was working perfectly with the 22t ecu.
so i drove it for a while, having read about the 20g cold start problems, i thought that if i got it up to operating temp it would even out the idle. no luck. so i decided to run d-check mode. and it came up with codes 43 and 45.
im goin to do more research tomorrow, but any help is appreciated.
Thanks guys!

[wtdash]

Hi,
You didn't read my THREAD on running the EJ20G ECU...or you'd have read this:

Wiring
The ignition differences are described above, but the MAP sensor also needs addressed. Otherwise, it'll throw a code - 45. The solution is to remove pin 5 on B48 and join it with pin 21 on B48 @ the ECU connector.

Code 43 is a Throttle switch on THIS SITE for the WRX.

I'd fix the Code 45 and see what comes back.

The idle issue may be your IAC/ idle air control valve. My Rob-tuned EJ20G ECU just started to have a poor idle when warm and warming up and the car would die @ stop lights randomly. I replaced ONLY THE TOP portion of the IAC and it's 100% better...and my EJ20G cold-start issue is slightly better (maybe). Easy to just remove the two screws, note the orientation (although it should be marked w/white paint) and reinstall.

I'd also recommend cleaning the IAC by pouring some Seafoam or other suitable cleaner down the IAC's intake tube while manually turning the IAC valve back and forth - easy to do w/the top off. When you restart the car you'll get some/a lot of white smoke out of the exhaust 'til it's used up so be aware!

GL,
Td

And for posterity - EJ20G ECU codes - check engine light / CEL:

Impreza Codes
These are the Impreza Error codes that are documented in the Workshop Manual & Stored in the ECU.
Note – not all error codes are not stored and are not documented (though they are all decoded by a Select Monitor) some of these may be found in the next section.
Code ITEM
11 Crankshaft position sensor
12 Starter switch
13 Camshaft position sensor
21 Engine coolant temperature sensor
22 Knock sensor
23 Mass air flow sensor
24 Idle air control solenoid
31 Throttle position sensor
32 Oxygen sensor
33 Vehicle speed sensor 2
35 Purge control solenoid valve
42 Idle switch
44 Wastegate control solenoid valve
45 Pressure sensor –Pressure exchange solenoid valve
51 Neutral position switch

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Other Subaru Codes
These codes are not documented in the Impreza Workshop manual but are mentioned in other Subaru Documentation (and can be decoded by a Select Monitor), these may or may not be applicable to the Impreza.
Code ITEM
11 Crank Angle Sensor or Circuit
12 Starter Switch or Circuit
13 Cam Position Sensor or Circuit (TDC Sensor on Justy)
14 Fuel Injector No. 1 (Legacy, Impreza, Justy, SVX)
15 Fuel Injector No. 2 (Legacy, Impreza, Justy, SVX)
16 Fuel Injector No. 3 (Legacy, Impreza, Justy, SVX)
17 Fuel Injector No. 4 (Legacy, Impreza, SVX)
18 Fuel Injector No. 5 (SVX)
19 Fuel Injector No. 6 (SVX)
21 Coolant Temperature Sensor or Circuit
22 Knock Sensor or Circuit (Right Side on SVX)
23 Air Flow Meter or Circuit (Exc. Justy)
24 Air Control Valve or Circuit (Exc. Justy)
25 Fuel injector No. 3 and 4 (XT-6)
26 Air Temperature Sensor (Justy)
28 Knock Sensor No. 2 (SVX, Left Side)
29 Crank Angle Sensor (SVX, No. 2)
31 Throttle Position Sensor or Circuit
32 Oxygen Sensor or Circuit (No. 1, Right Side, On SVX)
33 Vehicle Speed Sensor (VSS) or Circuit
34 EGR Solenoid or Circuit
35 Purge Control Solenoid or Circuit
36 Air Suction Solenoid Valve (Impreza)
37 Oxygen Sensor (No. 2, Left Side, On SVX)
38 Engine Torque Control (SVX)
41 Air/Fuel Adaptive Control
42 Idle Switch or Circuit
43 Throttle Switch
44 Wastegate Duty Solenoid (Turbo Models)
45 Pressure Sensor Duty Solenoid (Turbo Models)
45 Atmospheric Pressure Sensor or Circuit (Non-Turbo Models)
46 Neutral or Parking Switch or Circuit
47 Fuel Injector
49 Airflow Sensor
51 Neutral Switch (Manual Transmission Models)
51 Inhibitor Switch (Automatic Transmission Models)
52 Parking Brake Switch (Exc. Justy)
53 Fuel Pump or Circuit
54 Choke Control System
55 EGR Temperature Sensor or Circuit
56 EGR System
57 Canister Control System
58 Air Control System
61 Fuel Tank Pressure Control Solenoid (Impreza)
62 Fuel Temperature Sensor (Impreza)
63 Fuel Tank Pressure Sensor (Impreza)
64 Vacuum Line Control Valve or Circuit
65 Vacuum Pressure Sensor
66 Sequential turbo system
67 Exhaust valve solenoid (positive pressure)
68 Exhaust valve duty solenoid
71 Ignition Pulse System
73 Ignition Pulse System
74 Ignition Pulse System
88 TBI Control Unit

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Sensors
All Sensors
Under bonnet view of all sensors
Individual Sensors
Sensor Diagnostics
- Starter switch is abnormal
- Neutral position switch is abnormal.(AT)
3
Wastegate control solenoid valve is not functioning
1
Pressure sensor is abnormal
2
Pressure exchange solenoid valve is not functioning
5
Mass air flow sensor signal is abnormal
6
Oxygen sensor is not functioning
7
Vehicle speed sensor 2 is not functioning
8
Engine coolant temperature sensor signal is abnormal
9
Throttle position sensor signal is abnormal
9
Idle switch signal is abnormal
10
Idle air control solenoid valve is not functioning
11
Knock sensor signal is abnormal
12
No signal from camshaft position sensor, but signal from crankshaft position sensor
13
No signal from crankshaft position sensor when starter switch is ON
14
Purge control solenoid valve is not functioning

[ride_child]

i fixed it! i forgot to do some stuff to the patch harness and voila! beast unleashed!
thanks for your help wtdash!