DDEC III/IV Single ECM Troubleshooting

Section 82.3 Troubleshooting Flash Code 82

Section 82.3
Troubleshooting Flash Code 82

The following procedure will troubleshoot Flash Code 82. For code s 155 or 411, refer to "82.3.1 Check EGR Delta-Pressure Sensor" ; for code s 154 or 412, refer to "82.3.3 Check for Short" . Refer to "82.4.1 Read Codes" for troubleshooting code p 98/4. Refer to "82.5.1 Check for Open" for troubleshooting code 173/4. ‪

Section 82.3.1
Check EGR Delta-Pressure Sensor

Perform the following steps to check the EGR Delta-Pressure sensor:‪

  1. Unplug the EGR Delta-P connector.
  2. Unplug the 30–pin engine sensor harness connector.
  3. Install a jumper wire between cavities indicated for the part numbers involved at the EGR Delta-Pressure sensor: See Figure "EGR Pressure Sensor Wiring" .
    • P/N: 23531964 or earlier Series 50, cavity 1 and 3
    • P/N: 23527349, cavity 2 and 3
    • Click to see this graphic in a separate window

      Figure 1. EGR Pressure Sensor Wiring

  4. Measure resistance between cavities M2 and Y2 See Figure "EGR Pressure Sensor Wiring" .
    1. If the resistance measurement is less than or equal to 5 Ω, Refer to "82.3.2 Check for Open" .
    2. If the resistance measurement is greater than 5 Ω, circuit #958 or #416 is open. Repair the open and refer to "82.3.4 Verify Repair" .

Section 82.3.2
Check for Open

Perform the following steps to check for an open. ‪

  1. Remove jumper cable.
  2. Measure resistance between cavities M2 and Y2. See Figure "EGR Pressure Sensor Wiring" .
    1. If the resistance measurement is less than 5 Ω, #958 is shorted to #452. Repair short and refer to "82.3.4 Verify Repair" .
    2. If the resistance measurement is greater than 5 Ω, replace the sensor and refer to "82.3.4 Verify Repair" .

Section 82.3.3
Check for Short

Perform the following steps to check for a short:‪

  1. Unplug the EGR temperature sensor.
  2. Measure resistance between cavities A and B. See Figure "EGR Temperature Sensor Wiring " .
    Click to see this graphic in a separate window

    Figure 2. EGR Temperature Sensor Wiring

    1. If the resistance measurement is less than or equal to 5 Ω, circuit #907 has shorted to circuit #452. Repair the short. Verify. Refer to "82.3.4 Verify Repair" .
    2. If the resistance measurement is greater than 5 Ω, replace the EGR temperature sensor and verify the repair. Refer to "82.3.4 Verify Repair" .

Section 82.3.4
Verify Repair

Perform the following steps to verify repairs for the EGR temperature or pressure sensor: ‪

  1. Connect all connectors.
  2. Start and run the engine.
  3. Road test the engine.
    1. If code 82 was not logged, no further troubleshooting is required.
    2. If code 82 was logged, please review this section from the first step to find the error. Refer to "82.3.1 Check EGR Delta-Pressure Sensor" . If this is the second time through the procedure, call Detroit Diesel Technical Service, or try a test ECM.


DDEC III/IV Single ECM Troubleshooting Guide - 6SE497
Generated on 10-13-2008

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