What this code means
P003A can mean the wastegate position signal is outside its specified range when full closure is commanded.
P003A concerns the position feedback used when full closure of the turbocharger wastegate is commanded. The PCM is evaluating whether the position sensor output falls within the specified range for that commanded state. The code therefore needs to be read together with both the requested position and the feedback signal.
The wastegate actuator and position sensor are integrated with the turbocharger in this procedure. The listed checks still examine different things: visible condition around the actuator link and cover, actuator operation through the HDS, and the electrical result at the disconnected connector. Those results help separate the turbocharger-related branch from other related components and the conditional PCM conclusion.
What the vehicle may do
- The position signal may be out of range at commanded full closure.
Possible fault areas
- The actuator link or turbocharger cover may have a problem.
- The actuator, position sensor, related components, or PCM may be involved.
The confirmation sequence first establishes the stated engine condition and then uses the Electric Waste Gate function. The visual checks follow, looking at the actuator link and turbocharger cover. The operation check then observes what the actuator does when the HDS function is selected.
The connector voltage check comes after those inspections. Its expected reading belongs to the disconnected connector and IG mode described in that step. It is not a replacement for observing actuator operation or inspecting the mechanical areas. The final PCM assessment depends on the other inspection items being normal.
Diagnostic path
Understand the stored condition
P003A means Turbocharger Wastegate Control Actuator Position Exceeded Learning Limit. The PCM stores this code when the position sensor output is outside its specified range while the turbocharger wastegate control valve is commanded fully closed.
Before troubleshooting
The wastegate actuator and its position sensor are integrated with the turbocharger.
Initial confirmation
Start the engine. With the transmission in P or N and without load, hold the engine speed at 3,000 rpm until the radiator fan comes on. Let the engine idle for 2 minutes. Then run HDS [Electric Waste Gate]. The listed HDS paths are PGM-FI ＞ Function Test ＞ Electric Waste Gate and PGM-FI ＞ Data List.
Actuator link and turbocharger cover
Check for foreign material at the actuator link. Check the turbocharger cover for damage. Neither area should have visible abnormalities. If either check is abnormal, there is a problem with the turbocharger.
This is a visual-condition check. Foreign material at the link and damage to the cover are the particular findings being considered. Keep each observation attached to the area inspected. An abnormal condition in either of these areas follows the turbocharger branch given by the procedure.
Actuator operation
Select HDS [Electric Waste Gate] and watch the actuator. It should operate. If its operation is abnormal, there is a problem with the turbocharger.
Position sensor circuit check
This check evaluates the component through its related components. For this voltage check, have the Turbocharger connector (5P) disconnected. You will use female terminals 2 and 3. With the connector disconnected and IG Mode ON, check the unit output voltage.
- First probe: female terminal 2 and the other probe on female terminal 3.
The reading should be about 5.0 volts. If the reading is normal, there is a problem with the turbocharger. If the reading is abnormal, there is a problem with other related components.
This measurement evaluates the related circuit with the turbocharger connector disconnected. The two female terminal locations identify where the voltage is checked. Interpret the approximate expected reading under that setup: the stated normal result points toward the turbocharger, and an abnormal result points toward other related components.
PCM assessment
The PCM check applies only if the other inspection items indicated a normal condition. If those other checks were normal, the remaining cause is the PCM.
Takeaway
P003A concerns the position signal when full wastegate closure is commanded. The visual, operation, and voltage checks guide the diagnosis toward the turbocharger, related components, or PCM.
Final check
The documented checks can point toward the turbocharger, related components, or PCM.
The final assessment combines visible condition, commanded actuator operation and the connector reading. They are complementary stages with different test setups. Preserve their separate results so that the remaining PCM conclusion is used only when its prerequisite of normal earlier inspections is satisfied.
