Service Manual — page 192 of 715

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3-102 FUEL SYSTEM (DFI)
Oxygen Sensor Heater (Service Code 67) (DTC P0030)
(Checking wire for open circuit)
• Disconnect:
   Measuring Adapter
   ECU Connectors (see ECU Removal)
• Check the wiring for continuity between the ECU harness
  connector and sensor connector.
    Wiring Continuity Inspection
     ECU Harness Connector [A] ← →
        Oxygen Sensor Connector [B]
          P/BK lead (ECU terminal 64) [C]
    If there is no continuity, repair or replace the main har-
    ness.
    If there is continuity, check the oxygen sensor heater
    leads for open circuit (see Oxygen Sensor Circuit).
    If there is no continuity, repair or replace the main har-
    ness.
(Checking wire for short circuit to ground)
• Check the wiring for short circuit to ground by check-
  ing the continuity between the sensor connector [A] and
  frame ground [B].
    Wiring Continuity Inspection
     P/BK lead (ECU terminal 64) [C] ←→ Frame Ground
    If there is continuity, repair or replace the main harness.

    If there is no continuity, check the wiring for short circuit to
    ground by checking continuity between the oxygen sen-
    sor [A] and frame ground [B].
    Wiring Continuity Inspection
     BK lead [C] ←→ Frame Ground
    If there is continuity, replace the oxygen sensor.