Operation CHARM: Car repair manuals for everyone.
Home >> Mazda >> 1994 >> B2300 L4-2.3L VIN A >> Repair and Diagnosis >> Relays and Modules >> Relays and Modules - Powertrain Management >> Relays and Modules - Computers and Control Systems >> Engine Control Module >> Testing and Inspection
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

Engine Control Module: Testing and Inspection


1. Disconnect the Powertrain Control Module (PCM) connector.

Special Service Tool (SST) "Breakout Box":





2. Connect the Super Star II Tester to the PCM.
3. Measure the voltage at each terminal with a voltmeter.
4. If any PCM terminal voltage is incorrect, check the related input or output devices and wiring. If no problem is found, replace the PCM.
pro multis · About Operation CHARM