DTC 2-2-3

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

2-2-3 Idle air control (IAC) valve signal absent or faulty



DTC conditions:
By measuring the valve power consumption the control module can ascertain whether the valve is operating within its normal range.
If terminal 33 is grounded, power consumption will be too high. The control module considers power consumption under 0.12 A as a break in the circuit.
The DTC 2-2-3 is logged in both cases.

Causes of fault:
Break or grounding in the circuit or in the IAC valve.

Fault symptoms:
The engine will not start or Is difficult to start.
Low idle speed.

EL1




Checking the power supply
- Disconnect the IAC valve.
- Ignition on.
Connect a voltmeter between terminal 1 on the connector and GND.
The voltmeter should read battery voltage.

If this value is OK:
^ Check the IAC valve EL2.

If the reading is incorrect:
^ Check the wiring between the IAC valve and #9 on the control module for breaks In accordance with NA2. NA. Checking the Wiring

EL2




Checking the idle air control (IAC) valve
- Ignition off.
Connect an ohmmeter between terminals 1 and 2 on the IAC valve.
The ohmmeter should read approx. 8 ohms.

If this value is OK:
^ Connect the test box EL3.

If the reading is incorrect:
^ Try using a new IAC valve.

EL3




Connecting the test box
Connect the test box to MFI and check the GND points in accordance with P1-P2. P. Test Box, Signal Description
^ Continue with Checking the resistance to GND EL4.

EL4




Checking resistance to ground
- Idle speed air valve disconnected Connect an ohmmeter between #5 and #33.
The ohmmeter reading should indicate infinite resistance.

If this value is OK:
^ Check the wiring and the IAC valve resistance EL5.

If the reading is 0 ohms:
^ Check the wiring for grounding in accordance with NA3. NA. Checking the Wiring

EL5




Checking the wiring and the idle air control (IAC) valve resistance
- Connect the IAC valve.
- Ignition off.
Connect an ohmmeter between #33 and #9.
The ohmmeter should read approx. 8 ohms.

If this value is OK:
^ Check the IAC valve control EL6.

If the reading is incorrect:
^ Check the wiring between the IAC valve and #33 on the control module for contact resistance or breaks in accordance with NA6 and NA2. NA. Checking the Wiring

EL6




Checking the idle air control (IAC) valve control
- Connect the control module to the test box.
- Connect the IAC valve.
- Put in fuse 1 (or 31).
- Start the engine and let it idle.
Connect a voltmeter between #33 and #5.
The voltmeter should read 7-10 V.

If this value is OK:
Intermittent fault.
^ Check the connections for loose contacts in accordance with NA5. NA. Checking the Wiring

If the reading is battery voltage:
^ Try using a new control module.