Series 50G & 60G Troubleshooting

Section 6.13 SID 77, FMI 4, Flash Code 73, Gas Valve Position Input Voltage Low

Section 6.13
SID 77, FMI 4, Flash Code 73, Gas Valve Position Input Voltage Low

The gas valve position input voltage is below normal range.‪

Section 6.13.1
Troubleshooting SID 77, FMI 3, Flash Code 73

Troubleshoot as follows:‪

NOTICE:

To avoid damage to the harness and connectors when disconnecting harness connectors, ensure the pulling force is applied to the connectors and not to the wires extending from the connectors.‪

  1. Check wire 958 (orange and black, PSV position) for continuity at cavity M-2 in the Engine Sensor Harness (ESH) 30–pin connector (see Figure "Engine Sensor Harness 30–pin Connector" ) and pin E in the PSV connector (see Figure "PSV Connector" ). If there is an open path, repair or replace the wire, pins, and sockets.
    Click to see this graphic in a separate window

    Figure 1. Engine Sensor Harness 30–pin Connector

    Click to see this graphic in a separate window

    Figure 2. PSV Connector

    1. If code is still active, go to step 2.
    2. If the code is no longer active, refer to "6.13.2 Verification" .
  2. Check wire 958 (orange and black, PSV position) for a short to battery (+12/24 VDC) at cavities M-2 in the ESH 30–pin connector (see Figure "Engine Sensor Harness 30–pin Connector" ) and pin E in the PSV connector (see Figure "PSV Connector" ). If there is a short, repair or replace the wire(s), pins, and sockets.
    1. If code is still active, go to step 3.
    2. If the code is no longer active, refer to "6.13.2 Verification" .
  3. Check wire 910 (orange, PWM out No. 3) for continuity at cavity W-2 in the ESH 30–pin connector (see Figure "Engine Sensor Harness 30–pin Connector" ) and pin H in the PSV connector (see Figure "PSV Connector" ). If there is an open path, repair or replace the wire, pins, and sockets.
    1. If code is still active, go to step 4.
    2. If the code is no longer active, refer to "6.13.2 Verification" .
  4. Check wire 910 (orange, PWM out No. 3) for a short to ground at cavity W-2 in the ESH 30–pin connector (see Figure "Engine Sensor Harness 30–pin Connector" ) and pin H in the PSV connector (see Figure "PSV Connector" ). If there is a short, repair or replace the wire, pins, and sockets.
    1. If code is still active, go to step 5.
    2. If the code is no longer active, refer to "6.13.2 Verification" .
  5. Check wire 446 (red, 12 VDC PSV power supply) for continuity at pins A in the PSV connector (see Figure "PSV Connector" ) and A in the OEM power harness connector (see Figure "OEM Power Harness Connector" ). If there is an open path , repair or replace the wire, pins, and sockets.
    Click to see this graphic in a separate window

    Figure 3. OEM Power Harness Connector

    1. If code is still active, go to step 6.
    2. If the code is no longer active, refer to "6.13.2 Verification" .
  6. Check wire 150-A (black, PSV ground) for a short to ground at pins B in the PSV connector (see Figure "PSV Connector" ) and A in the OEM ground harness connector (see Figure "OEM Ground Harness Connector" ). If there is a short, repair or replace the wire(s), pins, and sockets.
    Click to see this graphic in a separate window

    Figure 4. OEM Ground Harness Connector

    1. If code is still active, call Detroit Diesel Technical Service.
    2. If the code is no longer active, refer to "6.13.2 Verification" .

Section 6.13.2
Verification

Verify that troubleshooting was successful:‪

  1. Check the DDR to see if SID 77, FMI 4, Flash Code 73 is still active.
    1. If the code is still active, go to step 2.
    2. If the code is not active, troubleshooting is complete.
  2. If code is still active, call Detroit Diesel Technical Service.


Series 50G and 60G Troubleshooting Guide - 6SE482
Generated on 10-13-2008

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