Series 50G & 60G Troubleshooting

Section 6.2 SID 21, FMI 0, Flash Code 41, Too Many SRS (Missing TRS)

Section 6.2
SID 21, FMI 0, Flash Code 41, Too Many SRS (Missing TRS)

The Timing Reference Sensor (TRS) measures the amount of crankshaft rotation. The Synchronous Reference Sensor (SRS) indicates the position of No. 1 (front) cylinder. See Figure "The TRS and SRS" . The ECM then knows when to fuel each cylinder from position, rotation, and firing order. ‪

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Figure 1. The TRS and SRS

SID 21, FMI 0, Flash Code 41 indicates that the ECM has detected extra SRS pulses, or the ECM has detected missing TRS pulses due to an open wire or a short.‪

Section 6.2.1
Troubleshooting SID 21, FMI 0, Flash Code 41

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 109 [purple, TRS (-)] for continuity at cavity T-1 in the Engine Sensor Harness (ESH) 30–pin connector (see Figure "Engine Sensor Harness 30–pin Connector" ) and pin A in the TRS connector (see Figure "The TRS and SRS" ). Repair or replace wire if path is open.
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    Figure 2. Engine Sensor Harness 30–pin Connector

    1. If the code is still active, go to step 2.
    2. If the code is no longer active, refer to "6.2.2 Verification" .
  2. Check wire 109 [purple, TRS (-)] for short to ground at cavity T-1 in the ESH 30–pin connector (see Figure "Engine Sensor Harness 30–pin Connector" ) and pin A in the TRS connector (see Figure "The TRS and SRS" ). If there is a short, repair or replace the wire.
    1. If the code is still active, go to step 3.
    2. If the code is no longer active, refer to "6.2.2 Verification" .
  3. Check wire 109 [purple, TRS (-)] for short to wire 416 (gray, 5 VDC sensor supply) at cavities T-1 (wire 109) and W-1 (wire 416) in the ESH 30–pin connector (see Figure "Engine Sensor Harness 30–pin Connector" ) and pin A in the TRS connector (see Figure "The TRS and SRS" ). If there is a short, repair or replace the wire(s).
    1. If the code is still active, go to step 4.
    2. If the code is no longer active, refer to "6.2.2 Verification" .
  4. Check wire 110 [dark green, TRS (+)] for continuity at cavity T-2 in the ESH 30–pin connector (see Figure "Engine Sensor Harness 30–pin Connector" ) and pin B in the TRS connector (see Figure "The TRS and SRS" ). Repair or replace wire if path is open.
    1. If the code is still active, go to step 5.
    2. If the code is no longer active, refer to "6.2.2 Verification" .
  5. Check wire 110 [dark green, TRS (+)] for short to ground at cavity T-2 in the ESH 30–pin connector (see Figure "Engine Sensor Harness 30–pin Connector" ) and pin B in the TRS connector (see Figure "The TRS and SRS" ). If there is a short, repair or replace the wire.
    1. If the code is still active, go to step 6.
    2. If the code is no longer active, refer to "6.2.2 Verification" .
  6. Check wire 110 [dark green, TRS (+)] for short to wire 416 (gray, 5 VDC sensor supply) at cavities T-2 (wire 110) and W-1 (wire 416) in the ESH 30–pin connector (see Figure "Engine Sensor Harness 30–pin Connector" ) and pin B in the TRS connector (see Figure "The TRS and SRS" ). If there is a short, repair or replace the wire(s).
    1. If the code is still active, call Detroit Diesel Technical Service.
    2. If the code is no longer active, refer to "6.2.2 Verification" .

Section 6.2.2
Verification

Verify that troubleshooting was successful :‪

  1. Check the DDR to see if SID 21, FMI 0, Flash Code 41 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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