2659/ FMI 1 EXHAUST GAS RECIRCULATION FLOW TARGET ERROR (LOW FLOW)

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    1. This troubleshooting applies to EPA07 DD13 engines ONLY; for EPA07 DD15, you must use the Advanced Diagnostic troubleshooting in DiagnosticLink® .

    1. Check for multiple codes.
        1. If any of the following codes are present, troubleshoot and repair them first:
          • SPN 411/FMI (any)
          • SPN 1636/FMI (any)
          • SPN 2791/FMI (any)
          • SPN 3563/FMI (any)
          • SPN 2630/FMI (any)

      1. If there are no other codes present, Go to step 3.

    1. Ensure Motor Control Module (MCM) software is version 13.2 ZGS003 or higher.

    1. Visually inspect the entire Exhaust Gas Recirculation (EGR) and exhaust system (turbine housing, exhaust manifold, etc.) for evidence of external leakage (e.g. soot, coolant deposits at joints).
        1. If external leakage is found, repair as necessary.

      1. If no external leakage is found, Go to step 5.

    1. Remove the delta P sensor from the mounting pad; leave the electrical harness connected.

    1. Inspect the delta P sensor for moisture inside the ports. Shake moisture out if necessary; do not replace the sensor.

    1. Inspect the delta P venturi ports for clogging and blockage. A layer of soot on the delta P sensor is OK.
        1. If no blockage is found, Go to step 8.

      1. If blockage is found, clean venturi ports. Do not replace delta P sensor.

    1. Turn the ignition ON (key ON, engine OFF).

    1. Using DiagnosticLink® , monitor delta P voltage (pin 109).

    1. Is the delta P voltage between 0.55 and 0.83 volts?
        1. Yes; Go to step 13.

      1. No; Go to step 11.

    1. Disconnect the delta P sensor harness connector.

    1. Inspect the delta P sensor harness connector for loose, bent, spread or corroded pins.
        1. If pin damage is found, repair as necessary.

      1. If no connector damage is found, replace delta P sensor. After sensor replacement, perform delta P re-calibration service routine and release the vehicle. Refer to section “Removal of the Delta P Sensor” .

    1. With key ON and engine OFF, compare inlet manifold pressure value with the barometric pressure value. Are the values within 1.5 psi (10.3 kPa) of each other?
        1. Yes; Go to step 14.

      1. No; inspect the inlet manifold pressure sensor and wiring for damage.

    1. Inspect the inlet manifold temperature sensor and the Charge Air Cooler (CAC) outlet temperature sensor connectors for corrosion.
        1. If no evidence of corrosion is found, Go to step 15.

      1. If evidence of corrosion is found, replace the affected temperature sensor and pigtail. Inspect the MCM 120-pin connector for corrosion and repair as necessary.

    1. Remove EGR cooler hot pipe, EGR crossover pipe and delivery pipe and inspect for excessive build up or blockage.
        1. If excessive build up or blockage is found, clean piping and replace EGR cooler. Refer to section “Removal of the DD13 Exhaust Gas Recirculation Cooler Water Manifold Assembly” .

      1. If there is no excessive build up or blockage, Go to step 16.

  1. Inspect the EGR valve for physical damage (broken butterfly, etc.).
      1. If the EGR valve is damaged, replace the center section of the exhaust manifold. Refer to section “Removal of the Exhaust Manifold” .

    1. If no damage is found, obtain a log file of the fault going active

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