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
Symptom Related Diagnostic Procedures
Connect a Scan Tool to the ALDL Connector. Drive the vehicle. Observe the Speedometer and Scan Tool speed display.
^
If the Speedometer and Scan Tool agree, check the ECM MEM-CAL, the
Vehicle Speed Sensor, and for the correct tire size.
^
If the Speedometer and Scan Tool disagree, service the Instrument Cluster.