Operation CHARM: Car repair manuals for everyone.
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

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Tests HA: Natural Gas Fuel Control




NOTE
This Pinpoint Test is intended to diagnose the following:
- Heated Oxygen Sensor (HO2S)/Heater
- HO2S Connections
- Vacuum Systems
- Fuel Injector(s)
- Harness Circuits: HO2S GND, HO2S, INJ 1-8, VPWR and SIG RTN
- Powertrain Control Module (PCM)
- Natural Gas Module (NG)

Pinpoint Test Connectors

HO2S Harness Connector Pin Locations:





Fuel Tank Pressure (FTP) Harness Connedtor:






HO2S Connector Pin Assignment

HO2S Connector Pin Assignment:






HO2S Location

HO2S Location:






Natural Gas Vehicle (NGV) Module 60 Pin Connector

Natural Gas Vehicle (NGV) Module 60 Pin Connector:






Pinpoint Tests