Section 8.4 SPN 164/FMI 3

Section 8.4
SPN 164/FMI 3

PN 164/FMI 3 indicates the Rail Pressure Governor Sensor circuit failed high (open circuit).‪

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Check as follows:‪

  1. Check for multiple codes.
    1. If faults for the Intake Manifold Pressure/Temperature Sensor are active at the same time, repair the circuit between pin 58 or pin 102 of the MCM 120-pin Connector and pin 2 or pin 4 of the Intake Manifold Pressure/Temperature Sensor. Refer to "8.4.1 Verify Repairs" .
    2. If only fault 164/3 is active, go to the next step.
  2. Disconnect the Rail Pressure Governor Sensor connector.
  3. Measure the resistance across pins 1 and 2 of the Rail Pressure Governor Sensor.
    1. If the resistance is greater than 4.7 k Ω, replace Rail Pressure Governor Sensor.
    2. If the resistance is less than 4.7 k Ω, go to the next step.
  4. Turn the ignition ON (key ON, engine OFF).
  5. Measure the voltage between pins 1 and 3 of the Rail Pressure Governor Sensor harness connector.
    1. If the voltage is between 2.75 and 3.25 volts, go to step 7 .
    2. If the voltage is less than 2.75 volts, go to the next step.
  6. Measure the voltage between pin 3 of the Rail Pressure Governor Sensor harness connector and ground.
    1. If the voltage is between 2.75 and 3.25 volts, repair the open circuit between pin 1 of the Rail Pressure Governor Sensor harness connector and pin 102 of the 120-pin MCM connector. Refer to "8.4.1 Verify Repairs" .
    2. If the voltage is less than 2.75 volts, repair the open circuit between pin 3 of the Rail Pressure Governor Sensor harness connector and pin 58 of the MCM 120-pin connector. Refer to "8.4.1 Verify Repairs" .
  7. Disconnect the 120-pin MCM connector and measure the resistance between pin 78 of the MCM 120–pin connector and pin 2 of the Rail Pressure Governor Sensor harness connector.
    1. If the resistance is less than 5 Ω, repair the short between pin 2 of the Rail Pressure Governor Sensor harness connector and pin 78 of the MCM 120-pin connector. Refer to "8.4.1 Verify Repairs" .
    2. If the resistance is greater than 5 Ω, replace the sensor. Refer to "8.4.1 Verify Repairs" .

Section 8.4.1
Verify Repairs

Verify repairs as follows:‪

  1. Turn ignition OFF.
  2. Reconnect any electrical connections that were disconnected to perform the diagnosis.
  3. Clear codes with DDDL 7.0 or latest version.
    warning

    ENGINE EXHAUST

    To avoid injury from inhaling engine exhaust, always operate the engine in a well-ventilated area. Engine exhaust is toxic.‪

  4. Start and bring engine up to operating temperature (over 140°F/60°C).
  5. Verify operation is satisfactory and no warning lamps illuminate. If warning lamps illuminate, troubleshoot the codes. If assistance is required, call the Detroit Diesel Customer Support Center at 313–592–5800.


DD15 Fuel System Technician's Guide - DDC-SVC-MAN-0037
Generated on 10-13-2008

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