DTC 1631- PWM1/Gauge1 Open/Ground Short

SFC 612-FPP Low Voltage

Key On -Engine Off System Data Mode

Does DST display FPP voltage of 0.2 volts or less with the Foot Pedal in idle position?

No

Slowly depress FP while observing FPP voltage.

Does DST FPP voltage ever drop below 0.2 volts?

No

Intermittent Problem Yes * Key Off * Disconnect FPP sensor from harness * Jumper 5 volt reference circuit and FPP signal circuit together * Key On

Yes Does DST display FPP voltage of 4.8 volts or greater? Yes

No

Probe FPP signal circuit with test light connected to battery voltage. * Poor sensor connection or * Faulty sensor

* Faulty FPP or * Faulty Connection or * Poor 5 volt power supply circuit Does DST display FPP voltage of 4.8 volts or greater? Yes

No

* FPP signal circuit open or shorted to ground or * Faulty ECM connection or * Faulty ECM * 5 volt reference is open or shorted to ground or * Faulty ECM connection or * Faulty ECM

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SPN 51, FMI 31 - TPS1/2 Simultaneous Voltages Out-of-Range

• Electronic throttle body • Check Condition- Key On, Engine On • Fault Condition- TPS1 and TPS2 voltages are both simultaneously out-of-range • Corrective Action(s)- Illuminate MIL, sound audible warning or illuminate secondary warning lamp, and shutdown engine • Non-emissions related fault

The throttle is an air valve used to control the amount of air available to the engine for combustion and thereby the engine’s power output. An electronic throttle simply means that a motor is controlled electronically through an electronic control system to actuate the throttle valve. Electronic throttle control is advantageous because it tends to offer improved starting, improved idle governing, improved maximum speed governing, excellent load acceptance and steady-state speed governing, permits engine synchronization, and offers flexibility to protect the engine during certain fault conditions.

This fault is generated when both feedback sensors in the ETB (TPS1 and TPS2) simultaneously produce out-of-range faults. This fault indicates that there is no feedback of the throttle valve and as a result throttle control cannot take place. This fault is, and should always be, configured to shut the engine down.

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SPN 51, FMI 31 - TPS1/2 Simultaneous Voltages Out-of-Range

Diagnostic Aids

Troubleshoot according to TPS1 voltage out-of-range following DTC 122 and 123 procedures. Troubleshoot according to TPS2 voltage out-of-range following DTC 222 and 223 procedures.

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