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Cylinder Power Imbalance
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 951 PID: P166 SPN: 166 FMI: 2/2 LAMP: None SRT: |
A power imbalance between cylinders was detected by the electronic control module (ECM). |
Engine can have rough idle or misfire. |
 Cylinder Power Imbalance
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Circuit Description
The ECM calculates the power output of each cylinder at engine idle speeds.
Component Location
The ECM is located on the intake side of the engine between the intake air horn and the front of the engine. Refer to Procedure 100-002 in Section E.
Shop Talk
At engine idle speeds, the ECM measures the instantaneous acceleration of each cylinder as it fires to determine the cylinder’s power. The ECM adjusts fueling to individual cylinders if the imbalance is within pre-defined limits. If the imbalance is greater than the pre-defined limits, Fault Code 951 will be set active.
Refer to Troubleshooting Fault Code t05-951.
Last Modified: 26-Oct-2010
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