ECM SYSTEM
WG1605-G-E3,WG1605-L-E3,WG1605-GL-E3, DM
1-221
DTC 2126-FPP1 Higher Than FPP2
• Hardware: Foot Pedal Position /Throttle control sensor
• Enabling Conditions: Key On, Engine Off
• Set Conditions: (FPP1 % - FPP2 %) is higher than 20 for longer than 1.5 seconds
• Corrective Action(s): Illuminate MIL, Power derate 2, Low rev limit
• Non-emissions related fault
• Possible Causes:
This fault indicates that the measured % deflection of sensor 1 is greater than sensor 2 by an amount defined in
calibration.
DTC 2122-FPP1 Voltage High
• Hardware: Electronic foot pedal/throttle control sensor
• Enabling Conditions: Key On, Engine Off
• Set Conditions: FPP1 voltage > 4.00 V for longer than 0.5 seconds
• Corrective Action(s): Illuminate MIL, activate low rev limit
• Non-emissions related fault
• Possible Causes: FPP signal shorted to voltage, 5 V_rtn1 open to FPP, FPP open internally
DTC 2127-FPP2 Voltage High
• Hardware: Electronic foot pedal/throttle control sensor
• Enabling Conditions: Key On, Engine Off
• Set Conditions: FPP2 voltage > 4.00 V for longer than 0.5 seconds
• Corrective Action(s): Illuminate MIL, activate low rev limit
• Non-emissions related fault
• Possible Causes: FPP signal shorted to voltage, 5 V_rtn1 open to FPP, FPP open internally
DTC 2123-FPP1 Voltage Low
• Hardware: Electronic foot pedal/throttle control sensor
• Enabling Conditions: Key On, Engine Off
• Set Conditions: FPP1 voltage < 0.300 V for longer than 0.5 seconds
• Corrective Action(s): Illuminate MIL, activate low rev limit
• Non-emissions related fault
• Possible Causes: Loss of 5 V supply, FPP1 signal circuit open or shorted to ground, faulty FPP, faulty ECM
DTC 2128-FPP2 Voltage Low
• Hardware: Electronic foot pedal/throttle control sensor
• Enabling Conditions: Key On, Engine Off
• Set Conditions: FPP2 voltage < 0.300 V for longer than 0.5 seconds
• Corrective Action(s): Illuminate MIL, activate low rev limit
• Non-emissions related fault
• Possible Causes: Loss of 5 V supply, FPP2 signal circuit open or shorted to ground, faulty FPP, faulty ECM
The FPP sensor is an electronic device that is coupled to a mechanically driven input as commanded by the
vehicle/engine operator. The FPP sensor output is proportional to the commanded input. The ECM uses the FPP
sensor input to control the throttle and adjust the engine’s load in order to achieve the requested power. Since the
FPP sensor inputs directly affect the engine’s power output, redundant sensors are generally used to ensure safe,
reliable operation. In electronic throttle control systems the foot pedal position/throttle control position sensor is used
by the engine/equipment operator or system to command either throttle position or a governor speed target
proportional to the input in order to achieve desired system behavior.
DTC 1121-FPP1/2 Simultaneous Voltages Out-of-Range
Diagnostic Aids Chart
• Troubleshoot according to FPP1 voltage out-of-range following DTC 2122 and 2123 procedures.
• Troubleshoot according to FPP2 voltage out-of-range following DTC 2127 and 2128 procedures.
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