Section 92.4
Spn2659/FMI 18

This code is typically EGR Low Flow (System Restriction Detected).‪

Section 92.4.1
EGR Low Flow Restriction Check

Check as follows:‪

1. Turn the ignition ON (key ON, engine OFF).
2. Using DDDL 7.X, perform Turbo Hysteresis test.
   1. If the Turbo Hysteresis test fails, refer to the refer to "6.5 Turbocharger (Diesel)" in the EPA07 Series 60 Workshop Manual (DDC-SVC-MAN-0005) for turbo diagnostics.
   2. If the Turbo Hysteresis test passes, go to step 3 .
3. Check EGR valve operation. Command PWM1 to 50% while monitoring "EGR Actual Position." Does "EGR Actual Position" read between 48-52%?
   1. Yes, go to step 4 .
   2. No, go to step 5 .
4. Command PWM1 to 90% while monitoring "EGR Actual Position." Does "EGR Actual Position" read between 88-92%?
   1. Yes, go to step 8 .
   2. No, go to step 5 .
5. Turn the ignition OFF.
6. Disconnect EGR Valve Harness connector.
7. Inspect connector for damaged, corroded pins.
   1. If damage is found, repair as necessary.
   2. If no damaged pins are found, replace the EGR Valve. Refer to "92.4.1.1 Verify Repairs" .
8. Check the Inlet Manifold Pressure Sensor; using DDDL 7.X compare inlet manifold pressure to barometric pressure. Is the inlet manifold pressure within 0.6 psi of barometric pressure?
   1. Yes, go to step 10 .
   2. No, go to step 9 .
9. Substitute a known good Inlet Manifold Pressure Sensor. Is the inlet manifold pressure now within 0.6 psi of barometric pressure?
   1. Yes, replace the Inlet Manifold Pressure Sensor. Refer to "92.4.1.1 Verify Repairs" .
   2. No, replace the MCM. Refer to "92.4.1.1 Verify Repairs" .
10. Access the “Voltage Service” Routine
11. Select “Start Acquiring.”
12. Monitor “P_DPF_IN” voltage.
13. Is the voltage between 0.44 to 0.56 volts?
    1. If yes, go to step 14 .
    2. If voltage is not within the range above, inspect electrical connections upstream to the MCM (sensor, ATD harness 10–pin, 31–pin VIH and the 120–pin MCM) for corrosion spread pins. If connector damage is found repair as necessary. If no corrosion or damage is found replace the suspect sensor. Refer to "92.4.1.1 Verify Repairs" .
14. Start the engine.
15. Increase engine to 1500 rpm while monitoring DPF Inlet Pressure.
16. Is DPF Inlet Pressure greater than 2 psi?
    1. Yes, go to step 17 .
    2. No, go to step 18 .
17. Inspect DOC Inlet face for soot contamination, or “DOC Push Out,” also inspect DPF Outlet for soot contamination. Replace contaminated/damaged component(s), re-install and perform parked regeneration.
18. Turn the engine OFF.
19. Remove the EGR valve and inspect the butterfly for physical damage.
    1. If butterfly damage is found, replace the EGR Valve. Refer to "92.4.1.1 Verify Repairs" .
    2. If no damage is found, replace the EGR cooler. Refer to "92.4.1.1 Verify Repairs" .

Section 92.4.1.1
Verify Repairs

Verify repairs as follows:‪

1. Turn ignition OFF.
2. Reconnect any electrical connections that were disconnected to perform the diagnosis.
3. Clear codes with DDDL 7.0 or latest version.
4. Start and bring engine up to operating temperature (over 140°F/60°C).
5. Verify operation is satisfactory and no warning lamps illuminate. If warning lamps illuminate, troubleshoot the codes. If assistance is required, call the Detroit Diesel Customer Support Center at 313–592–5800.