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

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

Or, hide this message: temporarily or permanently

Neutral Switch (MTX)

View: Neutral Switch:





PURPOSE
The neutral switch signals the engine control module (ECM) that the gear selector is either in neutral or any other position.

CONSTRUCTION
The neutral switch and the clutch switch are "ON/OFF" type switches. Both switches share the same ECM input terminal 1V.

OPERATION
The ECM uses the inputs in calculations for the control of these output systems and/or devices:
- Ignition control module (timing control)
- Fuel injection quantity
- Idle air control valve (idle speed)
- Purge solenoid valve (purge control)
- Pressure regulator control solenoid valves (fuel pressure)
- EGR solenoid valves (EGR operation)
- A/C cut-off.