GM Service Manual Online
For 1990-2009 cars only

Powertrain Control Module (PCM) 3.4 Liter LA1

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Ignition Switch in RUN/Engine running/Automatic Transmission in PARK/Air Conditioner is OFF

ECT Sensor

Eng 1, 2, EGR, EVAP, Misfire

°C/°F

Varies

FC Relay 1 Command

Eng 2

ON / OFF

OFF

FC Relay 2 and 3 Command

Eng 2

ON / OFF

OFF

FC Relay 1 Circuit Status

Output Driver Data

OK / Fault

OK

FC Relay 2 and 3 Circuit Status

Output Driver Data

OK / Fault

OK