GM Service Manual Online
For 1990-2009 cars only
Table 1: Instrument Panel Cluster (IPC)
Table 2: Powertrain Control Module (PCM) 8.1L

Instrument Panel Cluster (IPC)

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

Check Coolant Temperature

Outputs

On/Off

Off

Check Engine Temperature

Outputs

On/Off

Off

Displayed Coolant Temperature

Data

°C/°F

87°C (190°F)

Low Coolant

Outputs

On/Off

Off

Monitored Coolant Temperature

Data

°C/°F

82-93°C (180-200°F)

Powertrain Control Module (PCM) 8.1L

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

Engine Data 1

°C/°F

85°C-105°C (185°F-220°F) Varies with Temperature