| Circuit Diagram |

Signal Waveform Idle rail pressure regulator waveform
Inspection 1. Turn the ignition switch OFF and disconnect the battery negative (-) cable. 2. Disconnect the fuel pressure regulator valve connector.
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Inspection 1. Turn the ignition switch OFF. 2. Disconnect the temperature control actuator connector. 3. Verify that the temperature control actuator operates to the warm (Driver's side) or cool (Passenger's side) position when connecting 12V to terminal 3 and grounding terminal 4.