I've been searching throughout many different forums but all lead me to the same answer... "code 2 does not exist!" I'm getting a code 2 on my ECU even after resetting multiple times. Does anyone here know what code 2 is so I can fix it?
Chasis- 91 DA9
ECU- OBD-0 PR3
Engine- JDM B18C
Signed,
Frustrated!!!

 

HELP!!! Anyone!?!

 

It's your O2 sensor a code 1 is the one O2 sensor the code 2 is the 2nd O2 sensor

OBD0 is the only version that requires 2 o2 sensors in the primaries of the exhaust manifold.

 

In my experience not all oxygen sensor codes mean a bad sensor. Lots of times something else causes a bad fuel mixture and throws the code. Check out this link:http://www.mr2.com/TEXT/O2_Sensor.html

 

Code 2 is yes the secondary O2 sensor. If you dont have one just run a single wire to the added sensor on the exhaust manifold.
It goes to the C8 pin location
If you have one already double check wiring. This Ecu will not diagnose a faulty sensor,it just recognizes its not connected
Tech - PR3/PW0 Wiring

‘A’ connector (White)

N/C A15
Yel/Blk
+12V
Switched IGP1 A13
Yel/Blk
+12V
Switched IGP1 A11
Blu/Yel
Air control value
EACV (IAC) GAP A7
Yel
Injector
INJ4 A5
Lt Blu
Injector
INJ3 A3
Red
Injector
INJ2 A1
Brown
Injector
INJ1
A18
Blk/Red
GND
LG1 A16
Bro/Blk
GND
LG1 A14
Grn/Blk
Fuel pump
FLR A12
Grn/Blk
Fuel pump
FLR A10
Green
Purge valve
PCS A8
Green
VTEC Spool
VTS N/C A4
Black
GND
PG1 A2
Black
GND
PG1


‘B’ connector

B19
White
Knock Sensor
B17
White
Ignitor
ICM B15
White
Ignitor
ICM B13
Blu/Wht
+12V at start
STS B11
Black
Rear
Demister N/C N/C B5
Blu/Blk
VTEC pressure
VTP B3
Yellow
A/C Clutch
ACC B1
Wht/Grn
+12V always
VBU
B20
Brown
Adjust timing
N/C B16
Yel/Red
Speed sensor
VSS B14
Blue
Alternator
ALTC B12
White
Dist
Crank- B10
White
Dist
Crank+ B8
Blue/Red
A/C switch
ACS B6
Grn/Orge
Check light
MIL


‘C’ connector

C15
Yel/Red
MAP+
VCC1 C13
Yel/Whte
TPS+
VCC2 C11
White

MAP C9
Red/Wht
P/S
Pressure? C7
Red/Blue

TPS C5
Red/Yel
Air Temp
C3
Orange/Blue
Dist TDC+
C1
Blue/Grn
Dist CYL+

C16
White
O2 #1
C14
Grn/Wht
MAP-
SG1 C12
Grn/Wht
Sensor
GND SG2 C10
Grn/Wht
Brake Lt
C8
Red/Blue
O2 #2
C6
Red/Wht
Water T
C4
Wht/Blu
Dist TDC-
C2
Blu/Yel
Dist CYL-







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