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Diagnosis Procedure
1.CHECK IN-VEHICLE SENSOR SIGNAL
  1. Ignition switch ON.
  2. Check voltage between A/C amp. harness connector.
    A/C amp.Voltage
    ConnectorTerminal
    +-
    M554878
Is the inspection result normal?
Replace A/C amp. Refer to A/C AMP. REMOVAL AND INSTALLATION.
.
 
2.CHECK IN-VEHICLE SENSOR POWER SUPPLY
  1. Ignition switch OFF.
  2. Disconnect in-vehicle sensor connector.
  3. Ignition switch ON.
  4. Check voltage between in-vehicle sensor harness connector and ground.
    +-Voltage
    (Approx.)
    In-vehicle sensor
    ConnectorTerminal
    M411Ground5 V
Is the inspection result normal?
.
.
 
3.CHECK IN-VEHICLE SENSOR
Check in-vehicle sensor. Refer to Component Inspection.
Is the inspection result normal?
Replace A/C amp. Refer to A/C AMP. REMOVAL AND INSTALLATION.
Replace in-vehicle sensor. Refer to IN-VEHICLE SENSOR REMOVAL AND INSTALLATION.
 
4.CHECK IN-VEHICLE SENSOR POWER SUPPLY CIRCUIT FOR SHORT
  1. Ignition switch OFF.
  2. Disconnect A/C amp. connector.
  3. Check continuity between in-vehicle sensor harness connector and ground.
    In-vehicle sensor—Continuity
    ConnectorTerminal
    M411GroundNot existed
Is the inspection result normal?
Replace A/C amp. Refer to A/C AMP. REMOVAL AND INSTALLATION.
Repair harness or connector.