GM Service Manual Online
For 1990-2009 cars only
Table 1: Powertrain Control Module
Table 2: Instrument Panel Cluster

Powertrain Control Module

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Ignition switch in RUN/Engine running/Automatic transmission in PARK/Manual transmission in NEUTRAL/Air conditioner is OFF

ECT

Eng 1, 2, Fuel Trim, Misfire

°C/°F

Varies

High Speed Fan Relay

Eng 2

On/Off

Varies

Low Speed Fan Relay

Eng 2

On/Off

Varies

Instrument Panel Cluster

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Ignition switch in RUN/Engine running/Automatic transmission in PARK/Manual transmission in NEUTRAL/Air conditioner is OFF

Monitored Coolant Temp

Data 1

°C/°F

Varies

Displayed Coolant Temp

Data 1

°C/°F

Varies