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Diagnostic Aids

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  1. 1) DTC 0475: Check For Ground In Circuit 574 (Black/Pink Wire)

    DTC 0475 indicates a circuit failure has occurred in EPR control solenoid circuit. Possible causes for this DTC are:
    • Shorted to power.
    • Faulty EPR solenoid.
    • Open or shorted circuit.
    • Faulty PCM.

    Disconnect EPR connector. EPR is located on top of engine. Turn ignition off. Measure resistance between ground and terminal "A" (Black/Pink wire) at EPR wiring harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, locate and repair open circuit in Black/Pink wire. Clear DTCs, and repeat QUICK TEST .

  2. 2) Check EPR Coil

    Measure resistance between EPR terminals. If resistance is 2.5-12.0 ohms, go to next step. If resistance is not 2.5-12.0 ohms, replace EPR. Clear DTCs, and repeat QUICK TEST .

  3. 3) Check For Short To Power

    Disconnect PCM 104-pin connector, and inspect for damaged pins, corrosion and loose wires. Repair as necessary. Reconnect PCM connector. Measure voltage between ground and terminal "B" (Gray/Red wire) at EPR wiring harness connector. If battery voltage is not present, go to next step. If battery voltage is present, locate and repair short to power in Gray/Red wire. Clear DTCs, and repeat QUICK TEST .

  4. 4) Check For Short To Ground

    Disconnect PCM connector. Measure resistance between ground and terminal "B" (Gray/Red wire) at EPR wiring harness connector. If resistance is more than 10 k/ohms, go to next step. If resistance is 10 k/ohms or less, locate and repair short to ground in Gray/Red wire. Clear DTCs, and repeat QUICK TEST .

  5. 5) Perform Output State Check

    Reconnect PCM connector. Attach New Generation Star (NGS) scan tool. Turn ignition on. Connect DVOM between ground and terminal "B" (Gray/Red wire) at EPR harness connector. Using NGS tester, perform KOEO OUTPUT STATE SELF-TEST. See KOEO OUTPUT STATE SELF-TEST  under QUICK TEST. If voltage does not toggle between 12 volts and zero volts, go to next step. If voltage toggles between 12 volts and zero volts, reconnect all components. Repeat KOEO SELF-TEST  and KOER SELF-TEST  . If DTC is still present, replace PCM.

  6. 6) Check For Open Circuit

    Ensure EPR is disconnected. Disconnect PCM 104-pin connector, and inspect for damaged pins, corrosion and loose wires. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance of Gray/Red wire between EPR harness connector and test pin No. 42 at breakout box. If resistance is less than 5 ohms, reconnect all components. Repeat KOEO SELF-TEST  and KOER SELF-TEST  . If DTC is still present, replace PCM. If resistance is 5 ohms or more, locate and repair open circuit in Gray/Red wire. Clear DTCs, and repeat QUICK TEST .

  7. 7) DTC 0476

    DTC 0476 indicates an Exhaust Back Pressure Regulator (EPR) malfunction was detected during KOEO SELF-TEST . Possible causes for this DTC are:
    • Stuck or damaged butterfly.
    • Misadjusted or damaged linkage.
    • Restricted exhaust.
    • Exhaust leaks.
    • Faulty EPR.
    • Faulty Exhaust Back Pressure (EBP) Sensor.
    • Faulty PCM.

    Repair any KOEO EBP sensor DTCs before continuing with this test. Visually inspect butterfly tang. See Figure. If tang is open, go to next step. If tang is not open, repair damaged linkage or butterfly as necessary. Clear DTCs, and repeat QUICK TEST .

  8. 8) Check For Exhaust Restriction

    Ensure scan tool is connected to Data Link Connector (DLC). Using scan tool, access EBP PID from PID/DATA MONITOR & RECORD menu. Start engine. Briefly accelerate engine speed to Wide Open Throttle (WOT) while monitoring EBP PID. If EBP PID reading is less than 28 psi, go to next step. If EBP PID reading is 28 psi or more, repair restricted exhaust system. Clear DTCs, and repeat QUICK TEST .

  9. 9) Check EBP Sensor

    Ensure scan tool is connected to Data Link Connector (DLC). See VEHICLE PREPARATION & EQUIPMENT HOOKUP  under QUICK TEST. Turn ignition on. Using scan tool, access EBP PID from PID/DATA MONITOR & RECORD menu. Start engine and record EBP PID reading. While observing scan tool, briefly accelerate engine several times. If EBP PID reading increases 4 psi or more, go to next step. If EBP PID reading does not increase 4 psi or more, replace EBP sensor and retest system.

  10. 10) Check For Exhaust Leaks

    Inspect turbo pipe, crossover pipe and exhaust manifolds for leaks. Repair as necessary. Clear DTCs, and repeat QUICK TEST . If no exhaust leaks are found, go to next step.

  11. 11) Check EBP During KOEO Self-Test

    Disconnect EBP sensor connector. Install ICP/EBP Adapter Cable (D94T-50-A) between EBP sensor and sensor harness connector. Start engine. Measure voltage between signal circuit and signal ground at ICP/EBP adapter cable. Perform KOER SELF-TEST . If voltage increases 1.5-2.5 volts and then decreases as test ends, replace PCM. Clear DTCs, and repeat QUICK TEST . If voltage does not increase 1.5-2.5 volts and then decreases as test ends, go to next step.

  12. 12) EPR Visual Inspection

    Observe EPR valve linkage while performing KOER SELF-TEST . If linkage moves during self-test, adjust EPR linkage and repeat QUICK TEST . If linkage does not move during self-test, replace EPR valve. Clear DTCs, and repeat QUICK TEST .
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