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

Computers and Control Systems: Tools and Equipment

View: Special Service Tools:





SPECIAL SERVICE TOOLS / SYSTEM SELECTOR / SELF-DIAGNOSIS CHECKER





ENGINE SIGNAL MONITOR
- Engine Signal Monitor (49 9200 162A)
- Harness Adapter (49 TO18 902)
- Harness Adapter, Power (49 D088 008)

NOTE: The Engine Signal Monitor (49 9200 162A) was developed to check the ECM terminal voltages.

HOW TO USE THE ENGINE SIGNAL MONITOR
1. Connect the Special Service Tools (SSTs) to the ECM as shown.
2. Turn the selector switch and monitor switch to select the desired terminal number.
3. Measure the terminal voltage.

CAUTION: Do not apply voltage to the terminals of the SST. It will damage the SST.