Dodge Dakota (ND). Manual - part 1007

P0122-TPS/APP CIRCUITLOW

For the Transmission circuit diagram (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - DIAGNOSIS AND
TESTING).

For a complete wiring diagram Refer to Section 8W.

•

When Monitored:
Continuously with the ignition on and engine running.

•

Set Condition:
This DTC will set if the monitored TPS voltage drops below .078 volts for the period of 0.48 seconds.

Possible Causes

RELATED ENGINE TPS/APPS DTC’S PRESENT

POWERTRAIN CONTROL MODULE

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - TRANSMIS-
SION/TRANSAXLE/AUTOMATIC - 45RFE/545RFE - DIAGNOSIS AND TESTING).

Theory of Operation

Due to the integration of the Powertrain and Transmission Control Modules the New Generation Control Module III
will be referred to as the Powertrain Control Module (PCM). The 3–wire TPS (4.7L V-8 Engine) provides the PCM
with an input signal voltage that represents the throttle blade position of the throttle body. The Throttle Position
Sensor (TPS) is connected to the throttle blade shaft. As the position of the throttle blade changes, the output volt-
age of the TPS changes.

The PCM supplies approximately 5.0 volts to the TPS. The TPS output voltage (input signal to the PCM) represents
the throttle blade position. The PCM receives an input signal voltage from the TPS. This will vary in an approximate
range from 0.26 volts at minimum throttle opening (idle), to 4.49 volts at maximum opening (wide open throttle).

The Accelerator Pedal Position Sensor (APPS) is currently used only with the 5.7L V-8 engine. The APPS is a linear
potentiometer. It provides the PCM with a voltage signal proportional to the angle, or position of the accelerator
pedal. The APPS signal along with inputs from other sensors is used by the PCM to calculate the throttle plate
position.

A mechanical cable is used between the accelerator pedal and the APPS assembly. Although a cable is used
between the accelerator pedal and the APPS assembly, a mechanical cable is not used between the accelerator
pedal and the throttle body. The throttle plate position is electronically controlled by the PCM.

Diagnostic Test

DETERMINING IF RELATED ENGINE TPS/APPS DTC’S ARE PRESENT

With the scan tool, check Engine DTC’s.

Are there any Engine TPS/APPS DTCs present?

Yes

>> Refer to the Drivability Category and perform the appropriate Symptom.

>> Go To 2

21 - 420

AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS

P0122-TPS/APP CIRCUITLOW (CONTINUED)

CHECK TO SEE IF DTC IS CURRENT

With the scan tool, record the EATX DTC EVENT DATA to help identify the conditions in which the DTC was set.

With the scan tool, erase Transmission DTCs.

NOTE: To erase EATX DTC DTC EVENT DATA information, a BATTERY DISCONNECT must be performed.
Performing a BATTERY DISCONNECT may reset learned Transmission values to controller defaults which
may lead to erratic shift schedules.
Drive the vehicle and try to duplicate the conditions in which the DTC was reported by the EATX DTC EVENT
DATA.

With the scan tool, read Transmission DTCs.

Did the DTC P0122 TPS/APPS LOW, reset?

Yes

>> Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion,

damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems
are found, replace the PCM per the Service Information. With the scan tool, perform QUICK LEARN.

Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1.

>> Go To 3

INTERMITTENT WIRING AND CONNECTORS

The conditions necessary to set the DTC are not present at this time.

Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.

Wiggle the wiring and connectors while checking for shorted and open circuits.

With the scan tool, check the EATX DTC EVENT DATA to help identify the conditions in which the DTC was set.

Were there any problems found?

Yes

>> Repair as necessary.

Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1.

>> Test Complete.

AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS

21 - 421

P0123- TPS/APP CIRCUIT HIGH

For the Transmission circuit diagram (Refer to ) (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 45RFE/
545RFE - SCHEMATICS AND DIAGRAMS).

For a complete wiring diagram Refer to Section 8W.

•

When Monitored:
Continuously with the ignition on and engine running.

•

Set Condition:
This DTC will set if the monitored TPS voltage rises above 4.94 volts for the period of 0.48 seconds.

Possible Causes

RELATED ENGINE TPS/APPS DTC’S PRESENT

POWERTRAIN CONTROL MODULE

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - TRANSMIS-
SION/TRANSAXLE/AUTOMATIC - 45RFE/545RFE - DIAGNOSIS AND TESTING).

Theory of Operation

Due to the integration of the Powertrain and Transmission Control Modules the New Generation Control Module III
will be referred as the Powertrain Control Module (PCM). The 4.7L V-8 Throttle Positioning Sensor (TPS) provides
the PCM with an input signal voltage that represents the throttle blade position of the throttle body. The TPS is
connected to the throttle blade shaft. As the position of the throttle blade changes, the output voltage of the TPS
changes.

The 5.7L V-8 Accelerator Pedal Position Sensor (APPS) is a linear potentiometer that provides the PCM with a
voltage signal proportional to the angle, or position of the accelerator pedal. The APPS signal along with inputs from
other sensors is used by the PCM to calculate the throttle plate position which is electronically controlled.

Diagnostic Test

DETERMINING IF RELATED ENGINE TPS/APPS DTC’S ARE PRESENT

With the scan tool, check Engine DTC’s, this includes all one trip failures.

Are there any Engine TPS/APPS DTCs present?

Yes

>> Refer to the Drivability category and perform the appropriate symptom.

>> Go To 2

21 - 422

AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS

P0123- TPS/APP CIRCUIT HIGH (CONTINUED)

CHECK IF THE DTC IS CURRENT

With the scan tool, record the EATX DTC EVENT DATA to help identify the conditions in which the DTC was set.

With the scan tool, erase Transmission DTCs.

NOTE: To erase EATX DTC EVENT DATA information, a BATTERY DISCONNECT must be performed. Per-
forming a BATTERY DISCONNECT may reset all learned Transmission values to controller defaults that
could lead to an inconsistent shift schedule.
Drive the vehicle and try to duplicate the conditions in which the DTC was reported by the EATX DTC EVENT
DATA.

With the scan tool, read Transmission DTCs.

Did the DTC P0123 TPS/APPS HIGH, reset?

Yes

>> Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion,

Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1.

>> Go To 3

INTERMITTENT WIRING AND CONNECTORS

The conditions necessary to set the DTC are not present at this time.

Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.

Wiggle the wiring and connectors while checking for shorted and open circuits.

With the scan tool, check the EATX DTC EVENT DATA to help identify the conditions in which the DTC was set.

Were there any problems found?

Yes

>> Repair as necessary.

Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1.

>> Test Complete.

AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS

21 - 423

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