GM Service Manual Online
For 1990-2009 cars only
Table 1: Powertrain Control Module (PCM) 3.8L L36
Table 2: Powertrain Control Module (PCM) 3.8L L67
Table 3: Powertrain Control Module (PCM) 4.6L LD8

Powertrain Control Module (PCM) 3.8L L36

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, Misfire, AIR, Fuel Trim

°C/°F

Varies

FC Relay 1 Circuit Status

ODD

OK/Fault

OK

FC Relay 2 and 3 Circuit Status

ODD

OK/Fault

OK

FC Relay 1 Command

Eng 2

On/Off

Off

FC Relay 2 and 3 Command

Eng 2

On/Off

Off

Powertrain Control Module (PCM) 3.8L 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, Misfire, AIR, Fuel Trim

°C/°F

Varies

FC Relay 1 Circuit Status

ODD

OK/Fault

OK

FC Relay 2 and 3 Circuit Status

ODD

OK/Fault

OK

FC Relay 1 Command

Eng 2

On/Off

Off

FC Relay 2 and 3 Command

Eng 2

On/Off

Off

Powertrain Control Module (PCM) 4.6L LD8

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, Misfire, AIR, Fuel Trim

°C/°F

Varies

FC Relay 1 Command

Eng 2

On/Off

Off

FC Relay 2 Command

Eng 2

On/Off

Off