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Home >> Mazda >> 2008 >> Tribute Hybrid Touring, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Pinpoint Tests - Hybrid >> B: Powertrain Control Module (Pcm) Power Relay >> Test Procedure
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Test Procedure

  1. B1: CHECK THE VPWR CIRCUIT FOR AN OPEN IN THE HARNESS 
    • PCM connector disconnected.
    • PCM Power Relay connector disconnected.
    • Measure the resistance between:
      (+) PCM Power Relay Connector, Harness Side (-) PCM Connector, Harness Side
      VPWR - Pin 5 VPWR - Pin B35, B36
    • Is the resistance less than 5 ohms? 
    • Yes:  GO to  B2.
    • No:  REPAIR the open circuit. CLEAR the DTCs. REPEAT the self-test.
  2. B2: CHECK THE B+ VOLTAGE TO PCM POWER RELAY 
    • Key ON, engine OFF.
    • Measure the voltage between:
      (+) PCM Power Relay Connector, Harness Side (-)
      B+ - Pin 3 Ground
      IGN START/RUN - Pin 1 Ground
    • Are the voltages greater than 10.5 V? 
    • Yes:  GO to  B3.
    • No:  REPAIR the open circuit. CLEAR the DTCs. REPEAT the self-test.
  3. B3: CHECK THE GROUND CIRCUIT TO THE PCM POWER RELAY 
    • Measure the voltage between:
      (+) PCM Power Relay Connector, Harness Side (-) PCM Power Relay Connector, Harness Side
      B+ - Pin 3 GND- Pin 2
    • Is the voltage greater than 10.5 V? 
    • Yes:  INSTALL a new PCM Power relay. CLEAR the DTCs. REPEAT the self-test.
    • No:  REPAIR the open circuit. CLEAR the DTCs. REPEAT the self-test.
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