240 L4-2320cc 2.3L SOHC VIN 83 B230FD (1993)
Testing Pin 5 On Air Mass Meter
8.
Connect a lead from ECU connector pin 21 to ground.
9.
Connect voltmeter between ground and #5 connection on mass air flow sensor connector.
Reading: approx. 12 volts.
Testing Pin 1 On Air Mass Meter
10.
Connect voltmeter between mass air flow sensor connection #1 (ground) and #5 (current feed from system relay).
Reading: Approx. 12 volts
Remove ground lead from ECU connector pin 21. If reading is incorrect, continue with step 16. If reading is correct, continue with next steps.
11.
Disconnect all test equipment, reconnect all connectors (including the ECU connector). Keep rubber boot from mass air flow sensor connector
removed.
12.
Start engine and run to operating temperature (minimum of 60°C / 140°F).
