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Home >> Infiniti >> 2003 >> QX4 4WD >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0172: Fuel Injection System Too Rich Or DTC P0175: Fuel Injection System Too Rich >> DTC Confirmation Test (Using Generic Scan Tool)
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DTC Confirmation Test (Using Generic Scan Tool)

  1. Start engine and warm to normal operating temperature. Turn ignition off and wait at least 10 seconds. Disconnect MAF sensor 5-pin harness connector. See Figure. Start engine and let it idle for at least 5 seconds. Turn ignition off and reconnect MAF sensor harness connector.
  2. Using scan tool, Select MODE 7, and ensure 1st trip DTC P0102 is detected. Select MODE 4 and erase DTC. Start engine and let it idle for at least 10 minutes. Select MODE 7. If 1st trip DTC 0172 or P0175 is detected, go to DIAGNOSTIC PROCEDURE . If 1st trip DTC is not detected, go to next step.
  3. If it is difficult to start engine, fuel injection system has a malfunction. Attempt to start engine while depressing accelerator pedal. If engine starts, go to DIAGNOSTIC PROCEDURE . If engine does not start, visually check for intake and exhaust leaks or spark plug fouling.
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