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| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
The hybrid powertrain control module determines the engine speed which is based on the high-voltage battery pack state of charge. The ECM achieves throttle positioning by providing a pulse width modulated voltage to the throttle actuator motor. The throttle blade is spring loaded in both directions, and the default position is slightly open. The hybrid powertrain control module can detect a condition where the engine is cranking but does not start or has stalled, or if the engine speed does not match the commanded speed.
The throttle actuator control (TAC) motor is controlled by the engine control module (ECM). The DC motor located in the throttle body drives the throttle blade. In order to decrease engine speed, along with spark and fuel delivery changes the ECM commands the throttle closed reducing air flow into the engine and the engine speed decreases. In order to increase engine speed, the ECM commands the throttle plate open allowing more air to pass the throttle plate. If the hybrid powertrain control module detects the actual engine speed is not within a predetermined range of the commanded engine speed, this DTC sets.
| • | DTCs , P0068, P0101, P0102, P0103, P0112, P0113, P0116, P0117, P0118, P0121, P0122, P0123, P0128, P0171, P0172, P0201, P0202, P0203, P0204, P0222, P0223, P0300-P0304, P0351-P0354, P0461-P0463, P0496, P0606, P06A3, P0721, P1516, P2066-P2068, P2101, P2122, P2123, P2127, P2128, P2135, P2138, P2227-P2230 are not set. |
| • | The system voltage is between 9-32 volts. |
| • | The accelerator pedal position is valid. |
| • | The accelerator pedal position is less than 1 percent. |
| • | The engine has been running for greater than 60 seconds. |
| • | The vehicle speed is less than 1.6 km/h (1 mph). |
| • | The barometric pressure (BARO) is greater than 70 kPa (11 psi). |
| • | The engine coolant temperature (ECT) is greater than 60-125°C (140-257°F). |
| • | The intake air temperature (IAT) is warmer than -20°C (-4°F). |
| • | The commanded engine speed is steady within 25 RPM. |
| • | A scan tool output control is not active. |
| • | DTCs P0506 or P0507 run continuously when the above conditions are met for greater than 10 seconds. |
The actual engine speed is approximately 75 RPM less than the commanded engine speed.
The actual engine speed is approximately 150 RPM greater than the commanded engine speed.
DTCs P0506 and P0507 are Type B DTCs.
DTCs P0506 and P0507 are Type B DTCs.
| • | A stalling condition can cause DTC P0506 to set. |
| • | An intermittent vehicle speed sensor (VSS) signal can cause DTC P0507 to set. |
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
| ⇒ | If any other DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle . |
| • | Excess deposits in the Q38 throttle body. Refer to Throttle Body Inspection and Cleaning . |
| • | Restricted exhaust |
| • | Mechanical conditions that limit engine speed |
| • | Parasitic load on the engine -- For example, a transmission condition or a belt driven accessory condition. |
| ⇒ | If a condition is found, repair as necessary. |
| • | Vacuum leaks |
| • | A throttle valve that does not close correctly |
| • | Verify the correct operation of the crankcase ventilation system. Inspect for the following conditions: |
| - | The routing of the positive crankcase ventilation (PCV) system |
| - | Vacuum leaks in the PCV system |
| ⇒ | If a condition is found, repair as necessary. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
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