GM Service Manual Online
For 1990-2009 cars only
Table 1: Instrument Panel Cluster (IPC)
Table 2: Powertrain Control Module (PCM) 4.3L
Table 3: Powertrain Control Module (PCM) 4.8L, 5.3L, and 6.0L
Table 4: 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 Temp

Outputs

On/Off

Off

Check Engine Temp

Outputs

On/Off

Off

Displayed Coolant Temp

Data

Celsius (C)/Fahrenheit (F)

87°C (189°F)

Low Coolant

Outputs

On/Off

Off

Monitored Coolant Temp

Data

Celsius (C)/Fahrenheit (F)

87°C (Fluctuates range 82-93°C) 189°F (Fluctuates range 180-200°F)

Reduced Engine Power

Outputs

On/Off

Off

Powertrain Control Module (PCM) 4.3L

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

Coolant Level Switch

Engine Data 2

Low/OK

OK

ECT Sensor

Engine Data 2

Degrees

87°C (189°F)

Powertrain Control Module (PCM) 4.8L, 5.3L, and 6.0L

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

Coolant Level Switch

Engine Data 2

Low/OK

OK

ECT Sensor

Engine Data 1

Engine Data 2

Degrees

87°C (189°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

Coolant Level Switch

Engine Data 2

Low/OK

No

ECT

Engine Data 1

Engine Data 2

Engine Data 3

Degrees

87°C (189°F)