DTC 3-2-2

EQ. Diagnostic trouble code (DTC) 3-2-2 MFI LH 2.4

3-2-2 Mass air flow (MAF) sensor burn-off signal absent or faulty



DTC conditions:
If the engine speed has exceeded 2100 rpm and the engine temperature has exceeded 60°C (140°F) sensor burn-off should take place when the ignition is switched off. If the voltage on terminal 7 does not exceed 2 V the DTC will be logged.
If the DTC occurs together with DTC 1-2-1, remedy only 1-2-1 in accordance with EC.

Causes of fault:
Break or short circuit in the wiring between MFI #8 and terminal 4 on the MAF sensor.

Fault symptoms:
Various driving problems due to a dirty wire in the MAF sensor.

EQ1




Checking the power supply
- Warm up the engine, engine temperature should be over 60°C (140°F).
- Engine speed must exceed 2200 rpm.
Connect a voltmeter between terminals 4 and 1 (GND) on the MAF sensor connector.




- Switch off the engine.
The voltmeter should read approx. 4 V after a few seconds.

If the reading is OK:
Intermittent fault.
^ Check the MAF sensor connections for loose contacts in accordance with NA5 and clean the connector and treat it for corrosion in accordance with NA7. NA. Checking the Wiring

If the reading is incorrect:
- Disconnect the MAF
^ Clean the MAF sensor connector and treat it for corrosion in accordance with NA7. NA. Checking the Wiring
^ Connect the test box to MFI EQ2.

EQ2




Connecting the test box to MFI LH 2.4
- Ignition off.
- Connect the test box to MFI.
- Connect an ohmmeter between #8 and #5 (GND).
The ohmmeter should read infinite resistance.

If the value is OK:
^ Check the wiring resistance EQ3.

If the reading is incorrect:
^ Check the wiring to the MAF sensor for grounding in accordance with NA3. NA. Checking the Wiring

EQ3




Checking the wiring resistance
- Connect an ohmmeter between terminal 4 on the MAF sensor and #8 on the test box.
- The ohmmeter should read 0 ohms.

If this value is OK:
^ Try using a new control module on MFI.

If the reading is incorrect:
^ Check the wiring to the MAF sensor for breaks or contact resistance in accordance with NA2 and NA6. NA. Checking the Wiring