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Diagnostic Aids

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  1. 1) DTC 1663

    This DTC indicates that PCM has detected a FDCS circuit malfunction. Possible causes for this DTC are:
    • Faulty IDM.
    • Open or grounded circuit.
    • Faulty Powertrain Control Module (PCM).

    Disconnect PCM 104-pin connector, and inspect for damaged pins, corrosion and loose wires. Repair as necessary. Install Breakout Box (014-00950) and connect PCM connector to breakout box. Turn ignition on. Measure voltage between ground and test pin No. 95 at breakout box. If voltage is .5-.7 volt, go to next step. If voltage is less than .5 volt, go to step  3). If battery voltage is present, go to step  4).

  2. 2) Perform KOEO Output State Self-Test

    Attach New Generation Star (NGS) scan tool. Turn ignition on. Using NGS tester, perform KOEO OUTPUT STATE SELF-TEST  under QUICK TEST. Measure voltage between ground and test pin No. 95 at breakout box while depressing and releasing accelerator pedal. If voltage does not toggle between .5-.7 volt and 12 volts, replace PCM. Clear DTCs, and repeat QUICK TEST . If voltage toggles between .5-.7 volt and 12 volts, fault is intermittent. Go to step  7).

  3. 3) Check Brown/Orange Wire For Continuity

    Turn ignition off. Disconnect PCM connector from breakout box. Disconnect IDM 40-pin connector. IDM is located in left side of engine compartment. Measure resistance between terminal No. 17 (Brown/Orange wire) at IDM connector and test pin No. 95 at breakout box. If resistance is less than 5 ohms, go to step  5). If resistance is 5 ohms or more, locate and repair open circuit in Brown/Orange wire. Clear DTCs, and repeat QUICK TEST .

  4. 4) Check Brown/Orange Wire For Short To Power

    Turn ignition on. Measure voltage between ground and test pin No. 95 at breakout box. If battery voltage is not present, go to step  6). If battery voltage is present, locate and repair short to power in Brown/Orange wire between PCM connector and IDM connector.

  5. 5) Check Brown/Orange Wire For Short To Ground

    Turn ignition off. Measure resistance between test pin No. 95 and test pins No. 25, 51, 76, 77, 91 and 103 at breakout box. 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 Brown/Orange wire. Clear DTCs, and repeat QUICK TEST .

  6. 6) Check PCM Output State Function

    Connect PCM to breakout box. Ensure IDM is disconnected. Turn ignition on. Using NGS tester, perform KOEO OUTPUT STATE SELF-TEST  under QUICK TEST. Measure voltage between ground and test pin No. 95 at breakout box while depressing and releasing accelerator pedal. If voltage does not toggle between .5-.7 volt and zero volts, replace PCM. Clear DTCs, and repeat QUICK TEST . If voltage toggles between .5-.7 volt and zero volts, replace IDM. Clear DTCs, and repeat QUICK TEST .

  7. 7) Check For Intermittent

    Clear DTCs. Start engine and allow it to idle. Wiggle and bend small sections of wiring harness starting at IDM connector and working toward PCM. Perform KOEO SELF-TEST . If DTC 1663 is present, locate and repair intermittent in Brown/Orange or Gray/Red wire between IDM and PCM. Clear DTCs, and repeat QUICK TEST . If DTC 1663 is not present, no problem is indicated at this time.
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