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Home >> Mitsubishi >> 2002 >> Montero XLS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0122: Throttle Position (TP) Sensor Circuit Low Input >> Test Procedure
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Test Procedure

  1. Turn ignition on. Using scan tool, check data list item No. 14 (throttle position sensor). Turn ignition on. With throttle valve in idle position, voltage should be 0.535-0.735 volt. With throttle valve in fully open position, voltage should be 4.5-5.5 volts. If voltages are as specified, problem is intermittent. See INTERMITTENT DIAGNOSTIC TROUBLE CODES . If voltages are not as specified, go to next step.
  2. Turn ignition off. Disconnect TP sensor 4-pin connector. See Figure. Check TP sensor connector for loose, damaged, or corroded terminals. If problem exists, repair or replace connector. Go to step  10. If problem does not exist, go to next step.
  3. Turn ignition on. Measure voltage between ground and TP sensor connector terminal No. 4 (Green/Yellow wire). Voltage should be 4.8-5.2 volts. If voltage is as specified, go to step  6. If voltage is not as specified, go to next step.
  4. Check PCM connector D-108 for loose, damaged, or corroded terminals. If problem exists, repair or replace connector. Go to step  10. If problem does not exist, go to next step.
  5. Check for open or short to ground in Green/Yellow wire between TP sensor connector terminal No. 4 and PCM connector D-108 terminal No. 46. If problem exists, repair Green/Yellow wire. Go to step  10. If problem does not exist, replace PCM. Go to step  10.
  6. Measure resistance between TP sensor terminals No. 1 and 4 (component side). Resistance should be 3.5-6.5 K ohms. Also, measure resistance between TP sensor terminals No. 1 and 3 (component side) while moving throttle valve from idle position to full throttle position. Resistance should change smoothly in proportion to the opening angle of throttle valve. If both resistance checks are as specified, go to next step. If either resistance checks are not as specified, replace TP sensor . Go to step  10.
  7. Check PCM connectors D-108 and D-109 for loose, damaged, or corroded terminals. If problem exists, repair or replace connector(s). Go to step  10. If problem does not exist, go to next step.
  8. Check for open or short to ground in Yellow/Red wire between TP sensor connector terminal No. 3 and PCM connector D-109 terminal No. 78. If problem exists, repair Yellow/Red wire. Go to step  10. If problem does not exist, go to next step.
  9. Turn ignition on. Using scan tool, check data list item No. 14 (throttle position sensor). With throttle valve in idle position, voltage should be 0.535-0.735 volt. With throttle valve in fully open position, voltage should be 4.5-5.5 volts. If voltages are as specified, problem is intermittent. See INTERMITTENT DIAGNOSTIC TROUBLE CODES . If voltages are not as specified, replace PCM. Go to next step.
  10. Test drive vehicle following OBD-II drive cycle Other Monitor pattern. See OTHER MONITOR  under OBD-II DRIVE CYCLES under VERIFYING REPAIRS. Check for DTCs. If DTC P0122 is output, go to step  1 and retry diagnostic procedure. If DTC P0122 is not output, inspection is complete.
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