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Diagnostic Aids

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  1. 1) DTC 1280: Low ICP Circuit Input

    This DTC indicates injector control signal is out of self-test range (low). Possible causes for this DTC are:
    • Biased ICP sensor/PCM.
    • Open ICP sensor circuit.
    • Open VREF circuit.
    • Shorted ICP sensor circuit.
    • Faulty Powertrain Control Module (PCM).

    Disconnect ICP sensor connector. Turn ignition on. Measure voltage between ground and Brown/White wire (VREF circuit) at ICP sensor wiring harness connector. If voltage is 4.5-5.5 volts, go to next step. If voltage is not 4.5-5.5 volts, locate and repair open circuit in Brown/White wire. Clear DTCs, and repeat QUICK TEST .

  2. 2) Check SIG RTN Circuit

    Measure voltage between Brown/White wire and Gray/Red wire at ICP sensor wiring harness connector. If voltage is 4.5-5.5 volts, go to next step. If voltage is not 4.5-5.5 volts, locate and repair open circuit in Gray/Red wire (SIG RTN circuit). Clear DTCs, and repeat QUICK TEST .

  3. 3) Check ICP Signal Circuit

    Turn ignition off. 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 between Dark Blue/Light Green wire at ICP wiring harness connector and test pin No. 87 at breakout box. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, locate and repair open circuit. Clear DTCs, and repeat QUICK TEST .

  4. 4) Check VREF Circuit

    Measure resistance between Brown/White wire at ICP sensor wiring harness connector and test pin No. 90 at breakout box. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, locate and repair open circuit in Brown/White wire. Clear DTCs, and repeat QUICK TEST .

  5. 5) Check SIG RTN Circuit

    Measure resistance between Gray/Red wire at ICP sensor wiring harness connector and test pin No. 91 at breakout box. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, locate and repair open circuit in Gray/Red wire. Clear DTCs, and repeat QUICK TEST .

  6. 6) Check For Short To Ground

    Measure resistance between test pin No. 87 and test pins No. 25, 51, 76, 77, 91 and 103 at breakout box. If all readings are more than 10 k/ohms, go to next step. If any reading is 10 k/ohms or less, locate and repair short to ground in Dark Blue/Light Green wire. Clear DTCs, and repeat QUICK TEST .

  7. 7) Check For Short

    Connect PCM connector to breakout box. Measure resistance between test pin No. 87 and test pins No. 25, 51, 76, 77, 91 and 103 at breakout box. If all readings are more than 10 k/ohms, replace ICP sensor. Clear DTCs, and repeat QUICK TEST . If any reading is 10 k/ohms or less, replace PCM. Clear DTCs, and repeat QUICK TEST .

  8. 8) DTC 1281: High ICP Circuit Input

    This DTC indicates injector control signal is out of self-test range (high). Possible causes for this DTC are:
    • Biased ICP sensor/PCM.
    • Shorted ICP sensor circuit.
    • Faulty Powertrain Control Module (PCM).

    Disconnect ICP sensor connector. Turn ignition on. Repeat QUICK TEST . If DTC 1280 is set, replace ICP sensor. Clear DTCs, and repeat QUICK TEST. If DTC 1280 is not set, go to next step.

  9. 9) Check For Short To Power

    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 between test pin No. 87 and test pins No. 55, 71, 90 and 97 at breakout box. If all readings are more than 10 k/ohms, go to next step. If any reading is 10 k/ohms or less, locate and repair short to ground in Light Blue/Red wire. Clear DTCs, and repeat QUICK TEST .

  10. 10) Check For Short

    Connect PCM connector to breakout box. Measure resistance between test pin No. 87 and test pins No. 55, 71, 90 and 97 at breakout box. If all readings are more than 10 k/ohms, replace ICP sensor. Clear DTCs, and repeat QUICK TEST . If any reading is 10 k/ohms or less, replace PCM. Clear DTCs, and repeat QUICK TEST .

  11. 11) KOEO DTC 1212: High ICP Circuit Input

    This DTC indicates injector control signal is more than expected. Possible causes for this DTC are:
    • Biased ICP sensor.
    • Shorted ICP sensor circuit.
    • Open ICP SIG RTN circuit.
    • Faulty Powertrain Control Module (PCM).

    Turn ignition off. Disconnect ICP sensor connector. Measure resistance between ground and Gray/Red wire at ICP sensor wiring harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, locate and repair short to ground in Gray/Red wire. Clear DTCs, and repeat QUICK TEST .

  12. 12) Check For Short To Power

    Turn ignition on. Measure voltage between ground and Dark Blue/Light Green wire at ICP sensor wiring harness connector. If voltage is less than .25 volt, go to next step. If voltage is .25 volt or more, locate and repair short to power in ICP signal circuit. Clear DTCs, and repeat QUICK TEST .

  13. 13) Check ICP Sensor

    Turn ignition off. Reconnect ICP sensor connector. Ensure scan tool is connected to Data Link Connector (DLC). Turn ignition on. Using scan tool, access ICP PID from PID/DATA MONITOR & RECORD menu. If ICP PID reading indicates zero psi, replace PCM. Clear DTCs, and repeat QUICK TEST . If ICP PID reading does not indicate zero psi, replace ICP sensor. Clear DTCs, and repeat QUICK TEST .

  14. 14) Continuous Memory DTC 1212

    This DTC indicates that there was no ICP signal present during cranking. Possible causes for this DTC are:
    • Empty/low oil reservoir.
    • Injection Pressure Regulator (IPR) circuit fault.
    • Faulty IPR valve.
    • Faulty ICP sensor.
    • Faulty high pressure pump.

    If any KOEO DTCs are set, service DTCs as necessary before continuing with this test. If DTC 1212 is still set, go to next step. If no KOEO DTCs are set, go to next step (for a no-start), or step  19) (for vehicle starts).

  15. 15) Check Oil Reservoir Level

    Remove plug in top of oil reservoir and check level. If oil level is within 1" (25.4 mm), go to next step. If oil level is not within 1" (25.4 mm), check and repair cause of low fluid. Top off fluid. Clear DTCs, and repeat QUICK TEST . If vehicle does not start, go to next step.

  16. 16) Check Injection Control Pressure (ICP) Sensor

    Disconnect ICP sensor connector. Attempt to start vehicle. If vehicle starts, replace ICP sensor and retest. If vehicle does not start, go to next step.

  17. 17) Check Oil System Pressure

    Perform INJECTION CONTROL PRESSURE TEST and check for pressurized oil leaks. See HARD START/NO-START DIAGNOSIS in I - SYSTEM & COMPONENT TESTS - 7.3L DIESEL article. Repair as necessary. If no leaks are found, go to next step.

  18. 18) Injection Pressure Regulator

    Check Reconnect all hoses and ICP sensor connector. Replace IPR valve. Ensure oil reservoir level is full. Attempt to start vehicle. If vehicle starts, replacing IPR valve corrected fault. Clear DTCs, and repeat QUICK TEST . If vehicle does not start, replace high pressure oil pump. Clear DTCs, and repeat QUICK TEST .

  19. 19) Check For Intermittent Faults

    Ensure scan tool is connected to Data Link Connector (DLC). Turn ignition on. Using scan tool, access ICP PID from PID/DATA MONITOR & RECORD menu. While observing ICP PID, wiggle and bend small sections of wiring harness starting at ICP sensor and working toward PCM. If ICP PID reading fluctuates, isolate fault and repair as necessary. Clear DTCs, and repeat QUICK TEST . If ICP PID does not fluctuate, go to next step.

  20. 20) Check Injection Pressure Regulator (IPR)

    Circuit Inspect wiring harness and connectors between IPR valve and PCM. Repair as necessary. Clear DTCs, and repeat QUICK TEST . If wiring harness and connectors are okay, no problems are indicated at this time. Clear DTCs, and repeat QUICK TEST .

  21. 21) DTC 1284

    This DTC indicates ICP sensor circuit failure has occurred while performing KOER CYLINDER CONTRIBUTION SELF-TEST . Perform KOEO SELF-TEST . If ICP circuit fault is indicated, service DTC as necessary. Clear DTCs, and repeat QUICK TEST . If no ICP fault is indicated, replace PCM. Clear DTCs, and repeat QUICK TEST .
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