Operation CHARM: Car repair manuals for everyone.
Home >> Chevrolet >> 1995 >> Cavalier/Z24 L4-2.2L VIN 4 >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Crankshaft Position Sensor >> Testing and Inspection
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

Crankshaft Position Sensor: Testing and Inspection

DESCRIPTION
The Powertrain Control Module (PCM) receives the 7X reference signal from the Crankshaft Position (CKP) sensor to enable alternating synchronous double fire fuel control. This signal is called a "7X" reference signal because it is a pulse which occurs 7 times per revolution. The PCM uses this signal from the CKP sensor to calculate engine RPM.

DIAGNOSIS
A Tech 1 scan tool has two displays based on this input. One indicates crank RPM or simply that the PCM is receiving the 7X reference pulses while cranking. The other indicates engine RPM while the engine is running.
pro multis · About Operation CHARM