Checks
| Action
|
DEFINITION: The engine has a power variation under a steady
throttle or cruise. The vehicle feels as if speeds up and slows down with
no movement of the accelerator pedal.
|
Preliminary Checks
|
| • | Refer to Important Preliminary Checks in
Symptoms
. |
| • | Ensure the vehicle operator understands the transmissions torque
converter clutch (TCC) operation (if equipped). |
| • | Ensure the vehicle operator understands the A/C compressor clutch
operation (if equipped). |
|
Sensor Checks
|
| • | Check for proper operation of the vehicle speed sensor (VSS). |
| • | Check for proper operation and performance of the oxygen sensor. |
|
Fuel System Checks
|
| • | Check for a lean or rich engine condition. |
| | Using a scan tool, observe the oxygen sensor output while operating
the vehicle under the symptom condition. |
| • | Ensure that the quarter-turn manual shut-off valve (if equipped)
is fully open. |
|
