DTC Advanced Diagnostics: P0122, P0123 (3.0L Engine)

DTC P0122: Throttle Position (TP) Sensor A Circuit Low Voltage DTC P0123: Throttle Position (TP) Sensor A Circuit High Voltage

General Description

Courtesy of HONDA, U.S.A., INC.

The throttle position (TP) sensor A is a semiconductor type, and it is attached to the throttle body and shaft to determine throttle valve position. The throttle valve position signal from the TP sensor A is transmitted to the powertrain control module (PCM) for target position feedback control. The sensor outputs low signal voltage at throttle valve close and high signal voltage at throttle valve wide open. If the TP sensor A output voltage is excessively high or low, the PCM detects a TP sensor A malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type

Execution	Continuous
Sequence	None
Duration	0.025 second or more
DTC Type	One drive cycle, MIL on

Enable Conditions

Condition
Vehicle	ON mode

Malfunction Threshold

DTC: P0122

The TP sensor A output voltage [TP Sensor A] is 0.456 V* 1 (0.216 V)* 2 or less for at least 0.025 second.

DTC: P0123

The TP sensor A output voltage [TP Sensor A] is 4.45 V* 1 (4.773 V)* 2 or more for at least 0.025 second.

*1: USA and Canada models*2: Mexico models[ ]: HDS Parameter

Possible Cause

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.

DTC: P0122

TP sensor A THL1 line short to ground
TP sensor A VCC3 line open
TP sensor A VCC3 line short to ground

DTC: P0123

TP sensor A THL1 line open
TP sensor A THL1 line short to power
TP sensor A SG3 line open

Common

TP sensor A failure
PCM internal circuit failure

Diagnosis Details

Conditions for setting the DTC

When a malfunction is detected, the MIL comes on and a Pending DTC, a Confirmed DTC, the freeze data, and the on-board snapshot are stored in the PCM memory.

Conditions for clearing the DTC

The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, the freeze data, and the on-board snapshot can be cleared with the scan tool clear command.