DIAGNOSTIC ITEM 21: Diagnose When The Scan Tool Cannot Receive The Data Sent By A/C-ECU - Vehicles With A/C - Or Heater Control Unit - Vehicles Without A/C: Notes

CAUTION: When servicing a CAN bus line, ground yourself by touching a metal object such as an unpainted water pipe. If you fail to do so, a component connected to the CAN bus line may be damaged.

Fig 1: CAN-B Communication Circuit Diagram

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Fig 2: CAN-B Communication Circuit Connectors

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.