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Fault Code 272, SPN 1347, Fmi 3: Troubleshooting Steps

Fault code 272 indicates a shorted high or open circuit in the fuel pump actuator, which is controlled by the ECM to regulate fuel flow. Troubleshooting steps include checking actuator resistance, signal voltage, and resistance between various pins and ground. Proper readings are essential for diagnosing the issue effectively.

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223 views1 page

Fault Code 272, SPN 1347, Fmi 3: Troubleshooting Steps

Fault code 272 indicates a shorted high or open circuit in the fuel pump actuator, which is controlled by the ECM to regulate fuel flow. Troubleshooting steps include checking actuator resistance, signal voltage, and resistance between various pins and ground. Proper readings are essential for diagnosing the issue effectively.

Uploaded by

sami abdul
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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FAULT CODE 272 , SPN 1347 , FMI 3

Fuel pump actuator shorted high or open circuit

fuel pump actuator is grounded to ecm , he ECM varies the current to this valve to provide the
correct fuel flow to the high-pressure pump based on engine operating conditions.

The fuel pump pressurizing assembly 1 [ACTUATOR] valve is a normally open valve

The PWM duty cycle to the fuel pump pressurizing assembly 1 depends on the difference between
desired rail pressure and sensed rail pressure

TROUBLESHOOTING STEPS

1. ACTUATOR RESISTANCE CHECK BETWEEN SIGNAL AND RETURN PINS [ NOT


CONNECTED TO HARNESS]

less than 5 ohms [actuator ok]

2. CHECK SIGNAL VOLTAGE IN HARNESS WHILE KEY SWITCH ON

Must be greater than 3 vdc

3. RESISTANCE BETWEEN THE HARNESS ACTUATOR RETURN PIN AND GROUND.

Must be less than 10 ohms

4. RESISTANCE BETWEEN THE FUEL PUMP ACTUATOR SIGNAL PIN IN HARNESS


[ ECM CONNECTOR] AND ALL OTHER PINS IN THE CONNECTOR

must be greater than 100k ohms

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