DTC Advanced Diagnostics: P0046 (3.0L Engine)

DTC P0046: Turbocharger Wastegate Control Actuator Circuit Range/Performance Problem

General Description

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

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

The powertrain control module (PCM) adjusts the boost pressure by controlling the turbocharger wastegate control actuator of the turbocharger. The actual turbocharger wastegate control valve position is compared with the target turbocharger wastegate control valve position. If the difference between the actual turbocharger wastegate control valve position and the target turbocharger wastegate control valve position is excessive, the PCM detects a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type

Execution	Continuous
Sequence	None

Duration	2.5 seconds or more
DTC Type	One drive cycle, MIL on

Enable Conditions

Condition	Minimum	Maximum
Engine coolant temperature [ECT Sensor 1]	155.9 deg.F (68.8 deg.C)	-
Turbocharger wastegate control valve position change per 5 milliseconds	1.5 mm (0.059 in)	-
Turbocharger wastegate control valve closed position learning	Completed
Boost pressure feedback	Closed loop

[ ]: HDS Parameter

Malfunction Threshold

Target turbocharger wastegate control valve position - (minus) actual turbocharger wastegate control valve position is less than -2.0 mm (-0.079 in), or more than 2.0 mm (0.079 in) for at least 2.5 seconds.

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.

Turbocharger wastegate control actuator failure
Turbocharger wastegate control actuator position sensor failure

Confirmation Procedure

Operating Condition

Start the engine. Hold the engine speed [Engine Speed] at 3, 000 rpm without load (in P or N) until the radiator fan comes on, then let it idle for 10 seconds.
Accelerate the vehicle from 38 mph (60 km/h) to 50 mph (80 km/h) by taking 3 seconds.

Test-drive the vehicle at a place where the outside temperature is 32 deg.F (0 deg.C) or more.
Drive the vehicle in this manner only if the traffic regulations and ambient conditions allow.

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.