Checks
| Action
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DEFINITION: The engine has a power variation under a steady throttle or cruise. The vehicle seems to speed up and slow down with no change in the accelerator pedal.
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Preliminary Checks
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| • | Ensure the driver understands the torque converter clutch (TCC) operation. |
| • | Ensure the driver understands the A/C compressor operation. |
| • | Use the scan tool in order to make sure the vehicle speed sensor (VSS) reading matches the vehicle speedometer. This excludes vehicles with electronic transmissions where some variation between VSS and the speedometer is normal. |
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Sensor Check
| Observe the fuel rail pressure (FRP) sensor .
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Fuel System Checks
| Check the fuel supply system pressure while the concern exists. Fuel is under suction, there is a restriction in the fuel system between the fuel tank and the fuel injection pump.
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Additional Checks
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| • | Inspect the control module grounds for being clean, tight, and in their proper locations. |
| • | Inspect the generator output voltage. Repair if less than 9 volts or more than 16 volts. |
| • | Inspect the torque converter clutch (TCC) operation. |
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