On Board Diagnostic System — Code No. 34 (Idle Air Control Valve)
F2-90flowchartCode No. 34 (Idle Air Control Valve)
1
STEP 1: Disconnect connector from ECM; is there battery positive voltage at ECM terminal 3Q with ignition switch ON?
Yes
Check ECM terminal for poor connection. If OK, replace ECM (see page F2-141); if not OK, repair or replace connector
No
2
STEP 2: In same condition as step 1, is there battery positive voltage at idle-up solenoid valve connector terminal?
Yes
Repair or replace wire
No
3
STEP 3: Does idle air control valve have correct resistance? (see page F2-99) Resistance: 10.7–12.3 Ω [at 20°C {68°F}]
No
Replace idle air control valve
Yes
Look for a short or open circuit in wiring from main relay (FUEL INJ relay) to idle air control valve