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)

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Ignition Power Module (MPA)

Ignition Control Module:





Ignition Power Module (MPA) triggers the ignition coil, and has the ability to advance or retard the timing depending upon the signals sent by the ECU. The ECU uses control system inputs to determine at what time and to what degree the ignition timing needs to be altered. Some system inputs that affect the signals to the MPA are:

- Coolant Temperature Sensor
- MAP Sensor
- MAT Sensor
- Closed Throttle Switch
- Throttle Position Sensor (TPS)