Kubota WG1605-E3, Diagnostic Manual

Page: 149 / 241

ECM SYSTEM
WG1605-G-E3,WG1605-L-E3,WG1605-GL-E3, DM
1-139
(4) IAT (Intake Air Temperature Sensor) (DTC 111, 112, 113, 127, 129)
DTC 111-IAT Higher Than Expected Stage 1
• Hardware: Intake Air Temperature Sensor
• Enabling Conditions: Engine Running higher than 1000 min
-1
(rpm)
• Set Conditions: Intake Air Temperature greater than stage 1 limit (71 °C (160 °F)) for longer than 60 seconds
when rpm is above 1000 min
-1
(rpm).
• Corrective Action(s): Activate power derate 1 (max 50 % throttle angle)
• Non-emissions related fault
• Possible Causes: Damaged inlet air system allowing hotter than normal air into engine intake system
DTC 112-IAT Low Voltage
• Hardware: Intake Air Temperature Sensor
• Enabling Conditions: Engine Running
• Set Conditions: IAT sensor voltage less than 0.050 V for longer than 1 second
• Corrective Action(s): Illuminate MIL, disable fuel adaptive learning while the code is active.
• Emissions related fault
• Possible Causes: Faulty ECM (no voltage on signal wire), signal wire shorted to ground or sensor internally
shorted
DTC 113-IAT High Voltage
• Hardware: Intake Air Temperature Sensor
• Enabling Conditions: Engine Running
• Set Conditions: IAT sensor voltage greater than 4.95 V for longer than 1 second
• Corrective Action(s)-Disable fuel adaptive learn while code is active
• Emissions related fault
• Possible Causes: Signal wire shorted to 12.0 V, signal wire open, sensor open internally or open 5 Vrtn1 (sensor
ground)
DTC 127-IAT Higher Than Expected Stage 2
• Hardware: Intake Air Temperature
• Enabling Conditions: Engine Running higher than 1000 min
-1
(rpm)
• Set Conditions: Intake Air Temperature greater than stage 2 limit (93 °C (200 °F)) for longer than 2 minutes
• Corrective Action(s)-Illuminate MIL, disable fuel adaptive learning while code is active
• Emissions related fault
• Possible Causes: Damaged inlet air system allowing hotter than normal air into engine intake system
KiSC issued 12, 2016 A