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Home >> Infiniti >> 2003 >> QX4 RWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0121: Throttle Position Sensor - Range/Performance Problem >> DTC Confirmation Test Malfunction "B" (Using CONSULT-II)

DTC Confirmation Test Malfunction "B" (Using CONSULT-II)

  1. Start engine and warm to normal operating temperature.
  2. Turn ignition off, and wait for 10 seconds. Turn ignition on.
  3. On CONSULT-II, select DATA MONITOR mode. From DATA MONITOR, select MANU TRIG, then select THRTL POS SEN and ABSOL TH-P/S. On CONSULT-II press RECORD at the same time press accelerator pedal to floor. Print out recorded graph and check following.
  4. Voltage rise is linear in response to accelerator pedal position. At wide open throttle, TPS voltage should be 4 volts. If voltage is as specified, go to next step. If voltage is not as specified, go to DIAGNOSTIC PROCEDURE .
  5. With CONSULT-II in DATA MONITOR mode, select AUTO TRIG. Maintain following conditions for at least 10 consecutive seconds:
    • Engine speed at 2000 RPM or more.
    • MAS A/F SE-B1 3.2 volts or more (as observed on CONSULT-II).
    • Engine coolant temperature 158°F (70°C) or more (as observed on CONSULT-II).
    • A/T in drive position or M/T in appropriate gear to drive vehicle uphill maintaining increased engine load for specified time period.
  6. If 1st trip DTC is detected, go to DIAGNOSTIC PROCEDURE .
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