Tps (Throttle Position Sensor) (Dtc 121 To 123, 221 To 223, 2111, 2112, 2135) - Kubota WG1605-E3 Diagnostic Manual

WG1605-G-E3,WG1605-L-E3,WG1605-GL-E3, DM
(6) TPS (Throttle Position Sensor) (DTC 121 to 123, 221 to 223, 2111, 2112,
2135)
DTC 121-TPS1 % Lower Than TPS2 %
• Hardware: Throttle Body-Throttle Position Sensors 1 & 2 relationship
• Enabling Conditions: Key-On, Engine Cranking, or Running
• Set Conditions-TPS1 % lower than TPS2 % by more than 20 % for longer than 1 second
• Corrective Action(s): Turn on MIL, activate engine shutdown mode
• Emissions related fault
• Possible Causes: TPS1 or TPS2 out of calibration in throttle body, unwanted resistance in either TPS1 or TPS2
signal circuits, unwanted resistance in either the shared reference feed (5 V_ext1) or shared sensor ground
(5 Vrtn1), bad ECM
DTC 122-TPS1 Signal Voltage Low
• Hardware: Throttle Body-Throttle Position Sensor 1
• Enabling Conditions: Engine running
• Set Conditions: TPS1 sensor voltage lower than 0.200 V for longer than 0.5 seconds
• Corrective Action(s): Illuminate MIL, shutdown engine
• Emissions related fault
• Possible Causes: Loss of 5.00 V reference feed, open or shorted to ground signal circuit, open or shorted to
ground TPS in throttle body, bad ECM
1-149
ECM SYSTEM
KiSC issued 12, 2016 A