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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Wide Open Throttle (WOT)

This is an OPEN LOOP mode. During WOT operation, the following inputs are received by the PCM:
- Engine coolant temperature
- Manifold absolute pressure
- Engine speed
- Throttle position

When the PCM senses WOT condition through the Throttle Position Sensor (TPS) it will:
- De-energize the air conditioning relay This disables the air conditioning system.

The exhaust gas oxygen content input is not accepted by the PCM during WOT operation. The PCM will adjust injector pulse width to supply a predetermined amount of additional fuel.