Series 60 DDEC V Troubleshooting – Section 73.3 Troubleshooting Flash Code 81, PID 412/FMI 3

Section 73.3
Troubleshooting Flash Code 81, PID 412/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 73.3.1
Check for Open

Perform the following steps to check for an open. ‪

1. Disconnect the EGR Temperature Sensor.
2. Install a jumper wire between cavities 1 and 2. See Figure "EGR Temperature Sensor Wiring" .
3. Disconnect the Engine Harness connector.
4. Measure resistance between E-10 and E-15. See Figure "EGR Temperature Sensor Wiring" .
   1. If the resistance measurement is less than or equal to 5 Ω, Refer to "73.3.2 Check for Short" .
   2. If the resistance measurement is greater than 5 Ω, circuit E-10 or E-15 is open. Repair and verify. Refer to "73.3.2.1 Verify Repairs" .
   

   Figure 1. EGR Temperature Sensor Wiring

Section 73.3.2
Check for Short

Perform the following steps to check for short:‪

1. Remove jumper wire.
2. Measure resistance between the engine block and E-10. See Figure "EGR Temperature Sensor Wiring" .
   1. If the resistance measurement is less than 1.5 k Ω, circuit E-10 is shorted. Repair and verify. Refer to "73.3.2.1 Verify Repairs" .
   2. If the resistance measurement is greater than 1.5 k Ω, replace the EGR temperature sensor.

Section 73.3.2.1
Verify Repairs

Perform the following steps to verify repairs.‪

1. Connect all connectors.
2. Start and run the engine.
3. Road test the engine.
   1. If code 81 was not logged, no further troubleshooting is required.
   2. If code 81 was logged, please 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.