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.
Check EGR Delta-Pressure Sensor
Perform the following steps to check the EGR Delta-Pressure sensor:
- Unplug the EGR Delta-P connector.
- Unplug the 30–pin engine sensor harness connector.
- 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
Figure 1. EGR Pressure Sensor Wiring
- Measure resistance between cavities M2 and Y2 See Figure "EGR Pressure Sensor Wiring" .
Check for Open
Perform the following steps to check for an open.
- Remove jumper cable.
- Measure resistance between cavities M2 and Y2. See Figure "EGR Pressure Sensor Wiring" .
Check for Short
Perform the following steps to check for a short:
- Unplug the EGR temperature sensor.
- Measure resistance between cavities A and B. See Figure
"EGR Temperature Sensor Wiring "
Figure 2. EGR Temperature Sensor Wiring
- 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" .
- 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" .
Perform the following steps to verify repairs for the EGR temperature or pressure sensor:
- Connect all connectors.
- Start and run the engine.
- Road test the engine.
- If code 82 was not logged, no further troubleshooting is required.
- 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|