Checks
| Action
|
DEFINITION: The engine delivers less than expected power. There is little or no increase in speed when partially applying the accelerator pedal.
|
Preliminary Checks
|
| • | Compare the vehicle with a similar unit. Ensure the vehicle has an actual problem. |
| • | Compare the scan tool data at idle with the scan tool data list. Refer to
Scan Tool Data List
. |
| • | Remove the air filter and check for dirt, or for air ducts being plugged or leaking. Repair or replace as necessary. |
| • | Inspect for a proper transmission operation. |
| • | Inspect the engine oil level and quality. |
|
Sensor Inspection
|
| • | Observe the Actual Fuel Rail Pressure and the Desired Fuel Rail Pressure parameters. If the pressure difference is more than 2 MPa, a fuel control issue may exist. |
| • | Inspect the crankshaft position (CKP) sensor reluctor wheel. Remove the CKP sensor and attempt to move the reluctor wheel front to back or side to side with a probe. If there is any movement the reluctor wheel retaining bolts are loose. |
| • | Observe that the barometric (BARO) and manifold absolute pressure (MAP) sensors are within 5 kPa of each other. Refer to
DTC P0106
. |
|
Fuel System Checks
|
| • | Observe the actual vs desired fuel rail pressure with a scan tool, with the engine idling. |
| • | Inspect the engine speed signal circuit for high resistance. |
| • | If the engine control module (ECM) or a fuel injector has recently been replaced, it may be necessary to confirm the fuel injector flow rate values. Refer to
Fuel Injector Flow Rate Programming
. |
|
Exhaust System Checks
| Inspect the exhaust system for a possible restriction. Refer to
Restricted Exhaust
.
|
Air Intake System Checks
|
| • | Inspect for an air leak or restriction in the air inlet ducts or the intake manifold. Refer to
DTC P0234
. |
| • | Inspect for an air leak in the charge air cooler with a
J 46091
Charge Air Cooler Tester. |
| • | Inspect for a restriction in the charge air cooler. |
| • | Inspect for a worn or damaged turbo charger turbine wheel, shaft or compressor wheel. |
| • | Inspect for a skewed mass air flow (MAF) sensor. Refer to Diagnostic Aids in
DTC P0101
. |
| • | Inspect that the EGR valve is fully closing. Remove the EGR valve and visually inspect that there is no light seen between the valves and the valve seats. |
| • | Ensure that the EGR valve does not bind when manually moving the valve. |
|
Engine Mechanical Check
| Inspect the engine for the following:
| • | Improper valve timing |
| • | Improper or worn camshaft |
Refer to
Engine Compression Test
.
|
Additional Checks
|
| • | Inspect the control module grounds for being clean, tight, and in their proper location. |
| • | Inspect the torque converter clutch (TCC) operation. |
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