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

With SST-Monitor, Engine Signal


MASS AIR FLOW SENSOR
Inspection
Using SST-(Monitor, Engine Signal)
1. Check the mass air flow sensor for damage and cracks.
2. Remove the powertrain control module (PCM).




3. Connect the special service tools (SST)s to the PCM.
4. Measure the voltage at the PCM terminals as shown in the table.




5. If not as specified, inspect following:




Harness continuity
- Between PCM terminal 3E and mass air flow sensor terminal B
- Between PCM terminal 4D and mass air flow sensor terminal A
- Between PCM terminal 4A and mass air flow sensor terminal C
6. If there is incorrect terminal voltage or harness continuity, replace the mass air flow sensor.