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

Checking Engine Speed Sensor Signal

Checking Engine Speed Sensor Signal
- Ignition ON.
- Go into scrolling values.
- Operate starter motor.
- Read OFF engine speed (RPM).
- Engine speed should be 100-300 rpm when the engine is being turned by the starter motor.

If reading is OK:
^ Proceed to Checking Ignition Relay.

If reading is incorrect:
^ Fault-trace engine speed sensor.
^ Proceed to Testing By Trouble Code - Code EFI-131 Engine Speed Sensor Signal.