Briggs & Stratton BIG BLOCK EFI, Repair Manual

Page: 65 / 142

Section 2: Troubleshooting DTCs 61
DTC P0505 Idle Air Control (IAC) Malfunction
Scan Diagnostics
Step Action Yes No
1
1. Select the Dashboard ribbon and then the Main tab.
2. Observe Engine Speed display while idling.
3. Is reading 750-950 RPM?
NOTE: Cold engine temperatures and low battery voltages
can cause high engine idle speeds. For example, at -18°
F. (-28° C.), idle speed can be as high as 1350 RPM, while
low battery voltages at normal engine operating tempera-
tures can cause the engine idle speed to reach 1200 RPM.
IAC
circuit OK.
Go to
DTC P0505
Non-Scan
Diagnostics.
Figure 2-51 Check Engine Speed Display.