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Home >> Suzuki >> 1999 >> Vitara JS+, 4D Utility, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P1450: Barometric Pressure Sensor Circuit Malfunction Or DTC P1451 Barometric Pressure Sensor Performance Problem
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DTC P1450: Barometric Pressure Sensor Circuit Malfunction Or DTC P1451 Barometric Pressure Sensor Performance Problem

  1. Turn ignition off. Connect scan tool to Data Link Connector (DLC). Turn ignition on. Clear DTC(s). Test drive vehicle and increase engine speed to 3000 RPM in 3rd gear (M/T) or "2" range (A/T). Release accelerator pedal and coast for 5 seconds or more. If necessary, perform test while coasting down a slope where engine can maintain 1600-3000 RPM and fuel-cut condition can be maintained for 5 seconds or more.
  2. Bring vehicle to a stop and allow engine to idle. Repeat test drive in step  1 2 times. Determine whether either DTC has reset. If DTC P1450 is present, replace PCM and retest system. If DTC 1451 has reset, go to next step.
  3. Inspect manifold differential pressure (MDP) sensor operation. See steps  1 and  2 in DTC P1408: MANIFOLD DIFFERENTIAL PRESSURE (MDP) SENSOR CIRCUIT MALFUNCTION  . If MDP sensor operation is not as specified, repair or replace MDP sensor or circuit as necessary. If MDP sensor operation is as specified, replace PCM and retest system.
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