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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 377 (Engine Controls - Self-Diagnostics - 4.3L) >> Diagnostic Tests >> DTC P0103: MAF Sensor Circuit - High Frequency >> Diagnostic Aids

Diagnostic Aids

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2003 GMC Sonoma, 2003 GMC Safari, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, and 2003 Chevrolet Blazer. However, it is still accessible from the selected car via links, so may be relevant.
  1. Any water that enters the air intake system that reaches the MAF sensor could cause this DTC to set. The water rapidly cools the hot sensing elements in the sensor causing a false indication of excessive air flow. Inspect the following areas for evidence of water intrusion:
    • The air induction system.
    • The Secondary Air Injection (AIR) if equipped.
  2. A poor connection in the ignition 1 voltage circuit of the MAF sensor can cause a DTC P0103 to set.

Condition may be related to aftermarket accessories. If the condition is intermittent, see INTERMITTENTS in TROUBLE SHOOTING - NO CODES - 4.3L ASTRO, BLAZER, JIMMY CANADIAN, SAFARI, SONOMA & S10 PICKUP article.

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