GM Service Manual Online
For 1990-2009 cars only
Table 1: Powertrain Control Module (PCM) 3.1 L (LG8)
Table 2: Powertrain Control Module (PCM) 3.8 L (L36, L67)

Powertrain Control Module (PCM) 3.1 L (LG8)

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, Fuel Trim, Misfire

°C/°F

Varies

Engine Hot Lamp Circuit Status

ODM

Fault/OK

OK

Engine Hot Lamp Command

ENG2

On/Off

Off

FC Relay 1 Circuit Status

ODM

OK/Fault

OK

FC Relay 1 Command

ENG2

On/Off

Varies

FC Relay 2 and 3 Circuit Status

ODM

OK/Fault

OK

FC Relay 2 and 3 Command

ENG2

On/Off

Varies

Powertrain Control Module (PCM) 3.8 L (L36, L67)

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

Eng 1, 2, EGR, EVAP, Cat, HO2S, Misfire, AIR

°C/°F

Varies

Engine Hot Lamp

ENG2

On/Off

Off

Fan High Speed

ENG2, Cat

On/Off

Off

Fan Low Speed

ENG2, Cat

On/Off

Off

FC Relay 1

ODM

Fault/OK

OK

FC Relay 2 and 3

ODM

Fault/OK

OK