P0505

DTC P0505 IDLE AIR CONTROL SYSTEM MALFUNCTION





SYSTEM DIAGRAM






WIRING DIAGRAM






DETECTING CONDITION






DTC CONFIRMATION PROCEDURE

NOTE: Check to make sure that following conditions are satisfied when using this DTC CONFIRMATION PROCEDURE.
- Intake air temp. or intake air temp. at start: higher than -7°C (19°F)
- Engine coolant temp. at start: higher than -7°C (19°F)
- Atmospheric pressure: higher than 570 mmHg (Altitude: lower than 2360 m (7740 ft))





TROUBLESHOOTING

Idle Air Adjusting Screw and Its Passage Check





Using SUZUKI scan tool
1) Connect SUZUKI scan tool to DLC with ignition switch OFF.
2) Warm up engine to normal operating temperature and keep it idle speed.
3) Check that "IAC DUTY" value displayed on SUZUKI scan tool increases when idle air adjusting screw is tightened and reduces when loosened.
If check result is as described above, idle air adjusting screw and its passage are in good condition.
If not, idle air adjusting screw is faulty or air passage is clogged.





Not using SUZUKI scan tool
1) Using service wire, ground diagnosis switch terminal in monitor coupler and connect duty meter (or volt meter) between duty output terminal and ground terminal of monitor coupler.
2) Warm up engine to normal operating temperature and keep it running at idle speed.
3) Check that idle air control duty value indicated by duty meter (or volt meter) increases when idle air adjusting screw is tightened and reduces when loosened.
If check result is as describe above, idle air adjusting screw and its passage are in good condition.
If not, idle air adjusting screw is faulty or air passage is clogged.

Fast Idle Air Valve
1) Disconnect AC valve coupler with ignition switch OFF.
2) Check that with cold engine started, as cooling water temperature rises, engine idle speed reduces gradually. If check result is as described above, fast idle air valve is in good condition.
If not, fast idle air valve, air passage or coolant passage is faulty.

IAC Valve And Its Circuit Check





1) Disconnect IAC valve hose from air intake pipe.
2) Turn ON ignition switch. Try blowing air into hose and check that air will not go in (hard to blow).





3) Using service wire, ground F33-12 (E172-12) terminal of ECM coupler with ignition switch OFF.
4) Turn ON ignition switch. Try blowing air into hose and check that air can be blown into air hose.
If check results are described above and E3312 (E172-12) terminal to ECM connection is OK, IAC valve and its circuit are in good condition.
If not proceed to step 5).





5) With ignition switch "OFF", disconnect IAC valve coupler.
6) Check resistance between each two terminals of AC valve.

Resistance: 11-14 Ohms at 20°C, 68°F

If it is within specification, proceed to step 7). If not, replace.





7) Disconnect AC valve air hose from air intake case. Try blowing air into air hose and check that air will not go in (hard to blow).





8) Connect 12V-battery to IAC valve terminals and check that air can be blown into air hose.
If check results are described above, check IAC valve harness.
If not, replace IAC valve.
9) Connect hose and coupler securely.