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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Using the Engine Signal Monitor




1. Connect the Special Service Tools (Engine Signal Monitor) to the PCM.
2. Verify that the throttle valve is at the closed throttle position.
3. Turn the ignition switch to ON.
4. Measure the voltage at PCM terminal 3F.




5. If not as specified, inspect the throttle position sensor harness.
6. If the harness is OK, replace the throttle position sensor.