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HOMESERVICE MANUALSSAAB1995900 S, 2D HATCHBACK, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - TESTS W/CODES - 2.3L 4-CYLDIAGNOSTIC TESTINGDTC P0120, P0121, P0122 &/OR P0123 - TP SENSOR CIRCUITDIAGNOSIS & REPAIR PROCEDURE
1995 Saab 900 S, 2D Hatchback, Automatic

Diagnosis & Repair Procedure

1995 Saab 900 S, 2D Hatchback, AutomaticSECTION Diagnosis & Repair Procedure
  1. Connect scan tool to Data Link Connector (DLC). Start engine. Select READ FUNCTIONS. Select THROTTLE POSITION. If scan tool readout is about 10%, go to next step. If scan tool readout is about 2% or about 99%, go to step 5).
    NOTE: In the event of an internal TP sensor replacement, idle must be readjusted. See ADJUSTMENTS - 2.3L 4-CYL article.
  2. Depress the accelerator pedal very slowly, taking 20-30 seconds to achieve Wide Open Throttle (WOT). Observe scan tool during throttle advance. Readout should indicate a continuous, steady increase from 10% to 90%. Any break in the increase will cause a readout of 99% for a short time. If the scan tool readout is not as specified, go to next step. If the scan tool readout is as specified, go to step 5).
  3. Unplug the 3-pin TP sensor connector. Measure specified values between indicated TP sensor connector terminals and battery. See TP SENSOR CIRCUIT TEST  table. See Figure . If all readings are not as specified, go to next step. If readings are as specified, go to step 5).
    TP SENSOR CIRCUIT TEST

    Terminals Approximate Value
    1 & Battery (-) 5 Volts
    3 & Battery (-) 5 Volts
    2 & Battery (+) 12 Volts
    2 & 3 .1 Milliamps (mA)
  4. Check wiring between TP sensor connector and ECM for continuity and short circuits. See wiring diagram in WIRING DIAGRAMS  section. If wiring is good, go to next step. If any problems are found, repair circuit(s) as necessary.
  5. Clear DTC(s) and road test vehicle. If DTC is reset, retest system. If DTC is not reset, repair is complete.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.