Series 50G & 60G Troubleshooting

Section 6.10 SID 76, FMI 4, Flash Code 66, Engine Knock Level Sensor Input Voltage Low

Section 6.10
SID 76, FMI 4, Flash Code 66, Engine Knock Level Sensor Input Voltage Low

The engine knock level sensor input voltage is below normal range.‪

Section 6.10.1
Troubleshooting SID 76, FMI 4, Flash Code 66

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 976 (dark green, knock sensor) for short to ground at cavity L-2 in the Engine Sensor Harness (ESH) 30–pin connector (see Figure "Engine Sensor Harness 30–pin Connector" ), pin E in the SNEF module connector, and the knock sensor connector (see Figure "SNEF Module and Knock Sensor Connectors" ). If there is a short, repair or replace the wire(s), 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. SNEF Module and Knock Sensor Connectors

    1. If code is still active, go to step 2.
    2. If the code is no longer active, refer to "6.10.2 Verification" .
  2. Check wire 573 (brown, auxiliary timed input) for a short to ground at cavities X-1 in the ESH 30–pin connector (see Figure "Engine Sensor Harness 30–pin Connector" ) and pin C in the SNEF module connector (see Figure "SNEF Module and Knock Sensor Connectors" ). If there is a short, repair or replace the wire(s), pins, and sockets.
    1. If code is still active, call Detroit Diesel Technical Service.
    2. If the code is no longer active, refer to "6.10.2 Verification" .

Section 6.10.2
Verification

Verify that troubleshooting was successful:‪

  1. Check the DDR to see if SID 76, FMI 4, Flash Code 66 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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