Test A: Loss of Coolant
Test A: Loss Of CoolantNormal Operation
Under normal operation, the battery junction box (BJB) supplies constant power to the low speed engine cooling fan relay through fuse F1.2 (30A) and to the high speed cooling fan relay through fuse F1.6 (50A). The PCM provides the ground through the engine cooling fan resistor on circuit 15S-PA2 (GN/BU) for the low speed engine cooling fan relay on circuit 15S-PA9 (GN/WH) and also the high speed engine cooling fan relay on circuit 15S-PA1 (GN/BU).
Possible Causes
^ Hoses
^ Hose connections
^ Radiator
^ Coolant pump
^ Degas bottle
^ Heater core
^ Engine gaskets
^ Engine casting cracks
^ Engine block core plugs
TEST A: LOSS OF COOLANT
