Operation CHARM: Car repair manuals for everyone.
Home >> Chevrolet >> 2001 >> Cavalier L4-2.2L VIN 4 >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Testing and Inspection >> Initial Inspection and Diagnostic Overview >> - Bi-Fuel/Alternative Fuels >> Vehicle On-Board Diagnostics (Accessing and Clearing Codes) >> Scan Tool Data Definitions >> NGO Signal
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

NGO Signal

Display shows GASOLINE or ALT. FUEL. This display monitors the vehicles GASOLINE Control Module (VCM/PCM or ECM) NGO Enable Input circuit. Alternative fuel operation is requested when the AF ECU grounds the NGO Enable circuit to the gasoline control module. This display is received through serial data from the gasoline control module and NOT the AF ECU.
pro multis · About Operation CHARM