How many electric fans does a GM LS series PCM need?
How many electric fans does a GM LS series PCM need?
GM vehicles equipped with an LS-series PCM and electric fans operate both fans in low-speed and high-speed mode only. This requires two PCM outputs and three relays. By using the two PCM outputs and three relays, two electric fans can be controlled in low-speed and high-speed modes.
Do you need air conditioning for GM LS series?
Before getting too far into a discussion of electric fans and PCM calibrations, it is important to first consider air conditioning control. This Tech Tip is From the Full Book, HOW TO USE AND UPGRADE TO GM GEN III LS-SERIES POWERTRAIN CONTROL SYSTEMS.
When did GM start using electric fan control?
In 2005, when electric fans were introduced in GM trucks, both manual and automatic A/C controls communicated with the PCM using the Class 2 data stream, a signal not available in early retrofit vehicles. The best solution for retrofits using the PCM for electric fan control is a 1999–2002 Camaro, Firebird, or Corvette calibration.
What kind of fan does a Gen III GM truck use?
Many GM trucks equipped with a Gen III PCM use a mechanical fan. They use the typical high-speed-fan control output (red PCM connector, pin 33) as A/C automatic recirculation.
GM vehicles equipped with an LS-series PCM and electric fans operate both fans in low-speed and high-speed mode only. This requires two PCM outputs and three relays. By using the two PCM outputs and three relays, two electric fans can be controlled in low-speed and high-speed modes.
In 2005, when electric fans were introduced in GM trucks, both manual and automatic A/C controls communicated with the PCM using the Class 2 data stream, a signal not available in early retrofit vehicles. The best solution for retrofits using the PCM for electric fan control is a 1999–2002 Camaro, Firebird, or Corvette calibration.
Before getting too far into a discussion of electric fans and PCM calibrations, it is important to first consider air conditioning control. This Tech Tip is From the Full Book, HOW TO USE AND UPGRADE TO GM GEN III LS-SERIES POWERTRAIN CONTROL SYSTEMS.
Many GM trucks equipped with a Gen III PCM use a mechanical fan. They use the typical high-speed-fan control output (red PCM connector, pin 33) as A/C automatic recirculation.
