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)

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Quick Test 5.0A - Switch Monitor Test

NOTE: The Switch Monitor Test checks input signals from the individual input switches to the 4EAT.

1. Test all switches under conditions specified in Quick Test Step 5.0B - Switch Monitor Test Result Chart.
2. If all switches are OK, go to Diagnostic Charts-Operational Test.
3. If any switch fails, proceed to Diagnostic Charts-Pinpoint Test PPM.





Using the 4EAT Tester:
1. Ground the 4EAT Tester.
2. Connect the 4EAT Tester to the 6-pin 4EAT Self Test Input (STI) connector.
3. Connect the 1-pin 4EAT Self Test Output (STO) connector to ground with jumper wire.
4. Turn ignition switch ON.