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

Camshaft Position Sensor: Testing and Inspection

- Disconnect distributor lead coupler.





- Measure resistance of pickup coil by using ohmmeter.
- If resistance is out of specification, replace CMP sensor (signal generator) as follows.

Pickup coil resistance:
185 - 275 ohms at - 10°C (14°F) - 50°C (122°F)
240 - 325 ohms at 50°C (122°F) - 100°C (212°F)


- Remove distributor cap and rotor.
- Remove CMP sensor (signal generator) securing screws and lead wire clamp screws.
- Replace CMP sensor (signal generator).
- Adjust signal rotor air gap to specifications.
Refer to Adjustments.
- Install rotor, distributor cap seal and cap.