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Fuel System Underfueling
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 486 PID: P129 SPN: 1349 FMI: 1/18 LAMP: Amber SRT: |
Injector Metering Rail Number 2 Fueling Low – WarningAn unexpectedly low fuel delivery was detected on the rear three cylinders. |
Low power or rough idle. |
 Hydraulic Fuel System
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Circuit Description
The electronic control module (ECM) supplies voltage to open the rear fueling actuator for a short length of time. This allows a short pulse of fuel to flow to the injector. The injector then injects the fuel into the cylinder for combustion.
Component Location
The rear fuel metering actuator is located on the fuel control housing. It is the first actuator from the rear of the engine. The fuel control housing is located on the intake side of the engine below the exhaust gas mixer. Refer to Section E for a detailed component location view.
Shop Talk
The ECM estimates the amount of fuel delivered to each bank by monitoring the crankshaft acceleration pattern as it rotates. This fault is set active if the ECM estimates that the rear bank is receiving insufficient fuel flow.
Refer to Troubleshooting Fault Code t05-486
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