SPN 411/FMI 4
This diagnosis is typically EGR Delta P Sensor short to ground.
Check as follows:
- Disconnect the EGR Delta P Sensor.
- Disconnect the 120–pin MCM connector.
- Measure the resistance between pins 1 and 2 of the EGR Delta P Sensor.
- If the resistance is greater than 5Ω, go to the next step.
- If the resistance is less than 5Ω, repair the short between pins 103 and 117 of the 120–pin MCM connector. Refer to “39.4.1 Verify Repairs” .
- Measure the resistance between pins 2 and 3 of the EGR Delta P Sensor.
- If the resistance is greater than 5Ω, go to the next step.
- If the resistance is less than 5Ω, repair the short between pins 103 and 109 of the 120–pin MCM connector. Refer to “39.4.1 Verify Repairs” .
- Measure the resistance between pin 1 of the EGR Delta P Sensor and ground.
- If the resistance is greater than 3Ω, go to the next step.
- If the resistance is less than 3Ω, repair the short circuit between pin 1 of the EGR Delta P Sensor harness connector and ground. Refer to “39.4.1 Verify Repairs” .
- Measure the resistance between pin 3 of the EGR Delta P Sensor and ground.
- If the resistance is greater than 3Ω, repeat the previous steps. If the results are the same, call the Detroit Diesel Customer Support Center (313–592–5800).
- If the resistance is less than 3Ω, repair the short circuit between pin 3 of the EGR Delta P Sensor harness connector and ground. Refer to “39.4.1 Verify Repairs” .
Verify Repairs
Verify repairs as follows:
- Turn ignition OFF.
- Reconnect any electrical connections that were disconnected to perform the diagnosis.
- Clear codes with DDDL 7.0 or latest version.
ENGINE EXHAUST To avoid injury from inhaling engine exhaust, always operate the engine in a well-ventilated area. Engine exhaust is toxic. - Start and bring engine up to operating temperature (over 140°F/60°C).
- Verify operation is satisfactory and no warning lamps illuminate. If warning lamps illuminate, troubleshoot the codes.