P0243 - Turbocharger Wastegate Actuator 'A'
System
Powertrain (Engine & Gearbox)
Technical Description
The control module has detected a fault in the Turbocharger Wastegate Actuator 'A' (P0243).
Multimeter Test Points & Nominal Values
| Test Point / Component | Measurement | Nominal Target Range | Test Condition |
|---|---|---|---|
| Turbocharger Wastegate Actuator 'A' – Coil Resistance | Resistance (Ω) | 3 - 30 Ω (typical) | Connector disconnected at 20°C |
| Turbocharger Wastegate Actuator 'A' – Duty Cycle | PWM (%) | 5 - 95 % (modulates with target) | Engine running, actuator in control |
| Turbocharger Wastegate Actuator 'A' – Supply Voltage | Voltage (V) | 11.8 - 14.4 V | Ignition ON at connector |
Connector disconnected at 20°C
Engine running, actuator in control
Ignition ON at connector
Oscilloscope Waveform Analysis
2 ms/div, 20 V/divPossible Causes
Short to ground on the signal wire or an internal short circuit within Turbocharger Wastegate Actuator 'A'
Channel A:Verify dedicated wiring pins and signal pair for circuit A against the schematic.
Chafed or pinched wiring harness along the signal path to Turbocharger Wastegate Actuator 'A'
Internal mechanical wear or carbon deposits inside Turbocharger Wastegate Actuator 'A'
Defective internal output driver or reference circuit in the control module for Turbocharger Wastegate Actuator 'A'
Symptoms
Recommended Solution
Compare signal voltage and resistance between circuit A and companion circuit B at module connector.
Check wire insulation resistance to ground (< 1 Ω indicates harness pinched or chafed against engine block/chassis).
Verify loaded supply voltage and harness terminal pins at Turbocharger Wastegate Actuator 'A'.
Check circuit continuity and ground-side voltage drop (< 0.05 V) for Turbocharger Wastegate Actuator 'A'.
Check supply and the low-side driver at the ECM connector. Replace the actuator or repair the circuit based on the readings.
Mechanic's Tip
Use the scan-tool output test with the scope on the control side at the same time. If duty changes but the actuator does not move, the valve is stuck — not the electrical fault you were chasing.