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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Throttle Position Sensor: Testing and Inspection

The Throttle Position Sensor (TPS) operation is monitored by the Engine Control Module (ECM) and a short or open in the TPS circuit should set Diagnostic Trouble Codes (DTC) 7.

When testing the TPS with a DVOM, watch for a smooth transition from 0.5 volts to 4.5 volts while opening the throttle with the ignition key ON.