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Home >> Cadillac >> 1995 >> Seville SLS >> Repair and Diagnosis >> Engine Performance >> Engine Controls - Adjustments >> Throttle Position (TP) Sensor >> Throttle Position Sensor >> Adjustment (4.9L)
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Adjustment (4.9L)

  1. Warm engine to normal operating temperature. Turn ignition off. Disable alternator by grounding Green harness connector adjacent to alternator. Turn ignition on, with engine off. Enter diagnostics, and select Powertrain Control Module (PCM) override PS03, Idle Speed Control (ISC) motor. See TESTS W/CODES - 4.9L article in this section.
  2. Press COOLER button on Climate Control Panel (CCP). This action disengages A/C compressor and commands EGR off. CCP display will change from 50 to 00. ISC motor will slowly move to a fully retracted position (in about 20 seconds).
  3. Ensure throttle lever rests on minimum idle speed screw. With ISC plunger fully retracted, disconnect ISC motor harness. While still in PCM override PS03, select PCM data PD01, TP sensor. Check throttle position displayed on PCM parameter PD01 in degrees. If display reads -0.5° to +0.5°, TP sensor is properly adjusted. Reconnect ISC motor harness and disconnect ground wire at alternator.
  4. If display reads -10.0° to -0.6° or +0.6° to +90.0°, TP sensor requires adjustment. Turn ignition on, with engine off. Reenter diagnostics, and select Powertrain Control Module (PCM) override PS03, Idle Speed Control (ISC) motor. See TESTS W/CODES - 4.9L article in this section.
  5. Press COOLER button on Climate Control Panel (CCP) to retract ISC motor to minimum air setting. Loosen TP sensor screws enough to permit sensor rotation. Open throttle slightly and allow throttle lever to snap shut against minimum air screw.
  6. Adjust TP sensor so parameter display is zero degrees. Tighten TP sensor mounting screws. Recheck parameter and ensure TP sensor parameter is -0.5° to +0.5°. Reconnect ISC motor harness and disconnect ground wire at alternator. Perform TP sensor/idle learn procedure. See TP SENSOR/IDLE LEARN procedure below.
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