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

Transmission Code

Symptom:
P1687-NO COMMUNICATION WITH THE MIC

Test 1-2:




Test 3-6:





When Monitored:
Continuously with engine running.

Set Condition: The DTC sets in approximately 25 seconds if no BUS messages are received form the MIC.

POSSIBLE CAUSES
- OTHER BUS PROBLEMS PRESENT
- MIC - NO COMMUNICATION
- POWERTRAIN CONTROL MODULE
- INTERMITTENT WIRING AND CONNECTORS