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Home >> Suzuki >> 2001 >> Grand Vitara JLS, Standard >> 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 >> Diagnosis & Repair Procedure
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Diagnosis & Repair Procedure

  1. Perform DTC CONFIRMATION TEST . If DTC P1451 is set, go to next step. If DTC P1450 is set, replace PCM and go to DTC CONFIRMATION TEST . If DTCs P1450 and P1451 are not set, problem is intermittent. System is okay at this time. See TROUBLE SHOOTING - NO CODES article.
  2. Turn ignition off. Backprobing, measure voltage between PCM 26-pin connector C51-3 terminals No. 13 (Red/White wire) and No. 20 (Gray/Yellow wire). See Figure. Turn ignition on. Reading should be 3.3-4 volts. Start engine and allow it to idle. Reading should be less than 3.3 volts. If readings are as specified, replace PCM and go to DTC CONFIRMATION TEST . If readings are not as specified, go to DTC P1408. See DTC P1408: MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR CIRCUIT MALFUNCTION 
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