Series 60 DDEC V Troubleshooting – Section 73.2 Troubleshooting Flash Code 81, PID 411/FMI 3

Section 73.2
Troubleshooting Flash Code 81, PID 411/FMI 3

For all EGR related codes, always perform the “Exhaust Gas Recirculation System Basic Checks.” Refer to "20.18 Exhaust Gas Recirculation System Basic Checks for Series 60 Engines" .‪

Section 73.2.1
Check for Open

Perform the following steps to check for an open. ‪

1. Unplug the Engine Harness connector and unplug the EGR Delta-Pressure Sensor.
2. Install a jumper wire between cavities E-15 and E-38 at the engine sensor connector. See Figure "EGR  Delta-Pressure Sensor Wiring" .
   

   Figure 1. EGR  Delta-Pressure Sensor Wiring

3. Measure resistance between cavity 2 and 3. See Figure "EGR  Delta-Pressure Sensor Wiring" .
   1. If the resistance measurement is less than or equal to 5 Ω, Refer to "73.2.2 Check for Short" .
   2. If the resistance measurement is greater than 5 Ω, circuit E-15 is open. Repair and verify. Refer to "73.2.2.1 Verify Repair" .

Section 73.2.2
Check for Short

Perform the following steps to check for short: ‪

1. Remove the jumper wire.
2. Measure resistance between E-12 and E-38. See Figure "EGR  Delta-Pressure Sensor Wiring" .
   1. If the resistance measurement is less than 1.5 k Ω, circuit E-12 is shorted to E-38. Repair and verify. Refer to "73.2.2.1 Verify Repair" .
   2. If the resistance measurement is equal to 1.5 k Ω, replace the EGR Delta P sensor and go to "73.2.2.1 Verify Repair" .

Section 73.2.2.1
Verify Repair

‪

Perform the following steps to verify repairs.‪

1. Connect all connectors and start and run the engine.
2. Road test the engine.
   1. If code 81 was not logged, no further troubleshooting is required.
   2. If code 81 was logged, review this section from the first step to find the error. Refer to "73.2.1 Check for Open" . If this is the second time through the procedure, call the Detroit Diesel Customer Support Center (313–592–5800) or try a test ECM/ECU.