O2 sensor is on pin D7 as JazzMan described. No MAF sensor on Fiero.
Info from http://www.geocities.com/MotorCity/Garage/5007/fiero_osg/ECM.html
Pin Function
A01 Fuel Pump Relay[A] (Switch to IGN)
A02
A03
A04 EVRV[B] (Solid state)
A05 SES (Switch to Gnd)
A06 +12V Contact
A07 Upshift (Switch to Gnd)
A08 ALDL[E] (Serial data)
A09 ALDL[B] (Diagnostic terminal)
A10 VSS[U] (Input 2000Pulses/Mile)
A11 MAT[A] (Air temp input)
A12 Gnd
B01 +12V Batt.
B02
B03 EST (0.76V)
B04 EST (Sparktiming input)
B05 EST (Distributor ref. puls input)
B06
B07
B08 Airco (Compressor control)
B09
B10 GSS[A] (Park/Neutral Input)
B11
B12
C01
C02 Airco (Compressor control)
C03 IAC[D] Coil 2
C04 IAC[C] Coil 2
C05 IAC[A] Coil 1
C06 IAC[B] Coil 1
C07
C08
C09
C10 CTS[B] (Input)
C11 MAP[B] (Input)
C12 MAP[B] (Input)
C13 TPS[B] (Input)
C14 MAP[C]/TPS[A] (Common +5V Ref.)
C15 Fuel Injectors 2-4-6 (Gnd Switch)
C16 +12V Batt.
D01 Gnd
D02
D03
D04
D05 EST (Ignition mod. bypass output)
D06 Gnd
D07 OS (Input)
D08 EVRV[C] (Solid state)
D09
D10 not used
D11
D12 TPS[C]/CTS[A] (Common Gnd)
D13 MAT[B]/MAP[A] (Common Gnd)
D14 Fuel Injectors 1-3-5 (Gnd Switch)
D15 Fuel Injectors 1-3-5 (Gnd Switch)
D16 Fuel Injectors 2-4-6 (Gnd Switch)
CTS Coolant Temperature Sensor
EST Electronic Spark Timing
EVRV Electronic Vacuum Regulator Valve
GSS Gear Selector Switch
IAC Idle Air Control Valve
MAP Manifold Absolute Pressure Sensor
MAT Manifold Air Temperature Sensor
OS Oxygen Sensor
TPS Throttle Position Sensor
VSS Vehicle Speed Sensor
[This message has been edited by spark1 (edited 09-20-2003).]
