Important: Make sure the driver understands torque converter clutch (TCC) and A/C compressor operation as described in the owner's manual.
The speedometer reading and the speed reading on the scan tool should be equal.
Before diagnosing the symptom, check service bulletins for updates.
Step | Action | Values | Yes | No |
|---|---|---|---|---|
DEFINITION: Engine power varies under steady throttle or cruise, making it feel as if the vehicle speeds up and slows down with no change in the accelerator pedal position. | ||||
1 | Were the Preliminary Checks performed? | -- | Go to Step 2 | |
2 | Connect the scan tool to the data link connector (DLC). Does the oxygen sensor (O2S) respond quickly to different throttle positions? | -- | Go to Step 4 | Go to Step 3 |
3 |
Did you find and correct the condition? | -- | System OK | -- |
4 |
Is the Long Term Fuel Trim reading within the specified range? | -25% to +25% | Go to Step 7 | Go to Step 5 |
5 | Is the Long Term Fuel Trim reading below the value specified? | -20% | Go to DTC P0132 | Go to Step 6 |
6 | Is the Long Term Fuel Trim reading above the value specified? | 25% | Go to DTC P0131 | -- |
7 | Inspect the fuel system pressure while the condition exists. Is the fuel system pressure within the specified range? | 379-393 kPa (55-57 psi) | Go to Step 8 | Go to Step 17 |
8 | Inspect the in-line fuel filter. Is the filter dirty or plugged? | -- | Go to Step 18 | Go to Step 9 |
9 | Perform an injector diagnosis. Refer to Fuel Injector Balance Test with Special Tool . Does the injector balance test pinpoint the problem? | -- | Go to Step 19 | Go to Step 10 |
10 |
Is a repair necessary? | -- | Go to Step 11 | Go to Step 12 |
11 | Repair or replace any ignition system components as needed. Did you complete the repair? | -- | System OK | -- |
12 |
Is a repair necessary? | -- | Go to Step 13 | Go to Step 14 |
13 | Repair the electrical connections or the vacuum lines as needed. Did you complete the repair? | -- | System OK | -- |
14 | Measure the generator output voltage. Is the generator voltage within the specified range? | 12-16 V | Go to Step 16 | Go to Step 15 |
15 | Repair the generator. Did you complete the repair? | -- | System OK | -- |
16 |
Did you find and correct the condition? | -- | System OK | -- |
17 | Repair the fuel system as needed. Did you complete the repair? | -- | System OK | -- |
18 | Replace the fuel filter. Did you complete the replacement? | -- | System OK | -- |
19 | Replace the leaking or restricted fuel injectors. Did you complete the replacement? | -- | System OK | -- |
