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Diagnostic Aids

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  1. 1) DTCs 1283: Check Power Feed Circuit

    This DTC indicates that PCM has detected a IPR circuit malfunction. Turn ignition off. Disconnect IPR connector. IPR is mounted on high pressure oil pump, located on top of engine. Remove PCM relay from power distribution box in engine compartment. Measure resistance of Red wire between IPR connector and PCM relay 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 Red wire. Clear DTCs, and repeat QUICK TEST .

  2. 2) Check IPR Coil Resistance

    Measure resistance between IPR terminals. If resistance is 5-20 ohms, go to next step. If resistance is 5 ohms or more, replace IPR. Clear DTCs, and repeat QUICK TEST .

  3. 3) Check IPR Control 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 test pin No. 83 and test pins No. 71 and 97 at breakout box. Also, measure resistance between test pin No. 83 and test pins No. 25, 51, 76, 77 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 or power in Yellow/Red wire. Clear DTCs, and repeat QUICK TEST .

  4. 4) Check Wiring Harness Continuity

    Check for continuity in Yellow/Red wire between test pin No. 83 at breakout box and IPR wiring harness connector. If continuity exists, replace PCM. Clear DTCs, and repeat QUICK TEST . If continuity does not exist, locate and repair open circuit in Red/Yellow wire. Clear DTCs, and repeat QUICK TEST .

  5. 5) DTC 1282: Excessive Injection Control Pressure

    This DTC indicates excessive injection control pressure was detected during continuous diagnostic monitoring. Possible causes for this DTC are:
    • Intermittent short to ground in IPR circuit.
    • Stuck IPR.

    Turn ignition off. Disconnect IPR connector. IPR is located on top of engine. Attempt to start vehicle. If engine starts, replace IPR. Clear DTCs, and repeat QUICK TEST . If engine does not start, go to next step.

  6. 6) Check For Intermittent Short To Ground

    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 ground and test pin No. 83 at breakout box. Resistance should be more than 10 k/ohms. Wiggle and bend small sections of wiring harness starting at IPR connector and working toward PCM. If fault is indicated (resistance 10 k/ohms or less), isolate fault and repair as necessary. Reconnect all connectors. Clear DTCs, and repeat QUICK TEST . If no fault is indicated, no problem is indicated at this time. Clear DTCs, and repeat QUICK TEST . If DTC resets, replace PCM.

  7. 7) KOER DTC 1211

    This DTC indicates that control pressure was low during self-test. Possible causes for this DTC are:
    • Low reservoir oil level.
    • Poor oil quality.
    • Injector "O" ring leak.
    • Faulty IPR valve.
    • Faulty Injection Control Pressure (ICP) sensor.
    • Faulty oil pressure pump.
    • Faulty Powertrain Control Module (PCM).

    Perform KOEO SELF-TEST . If any DTCs are set, service DTCs as necessary. Clear DTCs, and repeat QUICK TEST . If no DTCs are set, go to next step.

  8. 8) 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 .

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

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

  10. 10) Check For Oil Aeration

    Again, using scan tool, access ICP PID from PID/DATA MONITOR & RECORD menu. Ensure ignition is on (engine off). Depress accelerator pedal to wide open throttle for 3 minutes. If ICP PID reading increases to more than 1250 psi, change oil and repeat test. If ICP PID reading does not increase to more than 1250 psi, go to next step.

  11. 11) Check ICP Sensor

    Disconnect ICP sensor connector. Install ICP/EBP Adapter Cable (D94T-50-A) between ICP sensor and sensor wiring harness connector. Start engine. Measure voltage between ICP signal circuit and ground at ICP/EBP adapter cable. Perform KOEO SELF-TEST . If voltage increases to more than 3 volts and then decreases to about one volt during ICP portion of test, replace PCM. Clear DTCs, and repeat QUICK TEST . If voltage does not increase to more than 3 volts and then decrease to about one volt during ICP portion of test, go to next step.

  12. 12) Injector Leak Check

    Disconnect high pressure hose from right cylinder head. Using Oil High Pressure Leakage Adapter Set (D94T-6600-A), plug right high pressure hose. Using scan tool, monitor IPR PID reading. Start engine and record IPR PID reading. Turn ignition off. Reconnect right cylinder head high pressure hose. Disconnect high pressure hose from left cylinder head. Using oil high pressure leakage adapter set, plug left high pressure hose. Again, monitor IPR PID reading. Start engine and record IPR PID reading. If IPR PID readings are not within 2 percent of each other, repair internal oil leak on cylinder head with the higher IPR PID reading. If both IPR PID readings are within 2 percent of each other, replace IPR and retest system. If DTC 1211 is still set, go to next step.

  13. 13) 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, replace high pressure oil pump.

  14. 14) Continuous Memory DTC 1211

    This DTC indicates that injector control pressure was not to specification during normal driving conditions. Possible causes for this DTC are:
    • Low reservoir oil level.
    • Poor oil quality.
    • Injector "O" ring leak.
    • Faulty IPR valve.
    • Faulty oil pressure pump.
    • Faulty Powertrain Control Module (PCM).

    Perform KOEO SELF-TEST . If any DTCs are set, service DTCs as necessary. Clear DTCs, and repeat QUICK TEST . If no DTCs are set, go to next step.

  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 .

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

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

  17. 17) Check For Oil Aeration

    Again, using scan tool, access ICP PID from PID/DATA MONITOR & RECORD menu. Ensure ignition is on (engine off). Depress accelerator pedal to wide open throttle for 3 minutes. If ICP PID reading increases to more than 1250 psi, change oil and repeat test. If ICP PID reading does not increase to more than 1250 psi, go to next step.

  18. 18) Perform KOER SELF-TEST

    Perform KOER SELF-TEST . If DTC 1211 is set, go to step  11). If DTC 1211 is not set, no problem is indicated at this time.
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