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Variable Geometry Turbocharger Actuator Over Temperature
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 9122 PID: S27 SPN: 641 FMI: 0/15 LAMP: None SRT: |
Variable geometry turbocharger actuator over temperature (calculated) |
Possible low power. Power to turbocharger actuator will be limited. |
 INSITE™ electronic service tool
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Circuit Description
The electronic control module (ECM) controls the turbocharger actuator motor, which changes the airflow of the turbocharger based on various engine operating conditions. The sliding nozzle in the turbocharger is operated by the turbocharger actuator motor. The turbocharger actuator motor is a DC motor that receives voltage from the ECM on the turbocharger actuator motor signal
(+) and turbocharger actuator motor signal (-) circuits. To open the sliding nozzle, the motor receives voltage on the turbocharger actuator motor signal
(+) circuit. To close the sliding nozzle, the motor receives voltage on the turbocharger actuator motor signal (-) circuit.
Component Location
The turbocharger actuator motor is part of the turbocharger actuator assembly, which is located on the exhaust side of the engine and is mounted to the bearing housing of the turbocharger. Refer to Procedure 100-002 for a detailed component location view.
Shop Talk
The electronic control module (ECM) calculates the temperature of the turbocharger actuator motor. If the ECM detects excessive temperatures for a calibrated period of time, this fault is recorded and power to the turbocharger actuator motor is limited. This action is for protection of the turbocharger actuator motor only; this fault code is not indicative of any component failure. Once the ECM detects normal turbocharger actuator motor temperatures, the fault code will go inactive and turbocharger operation will return to normal.
A combination of frequent turbocharger actuator movement and elevated coolant temperatures can lead to this fault code.
Refer to Troubleshooting Fault Code t05-9122
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