P1545 ISUZU – A/C Compressor Clutch Relay Control Circuit Malfunction

P1545 ISUZU Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

P1545 ISUZU Possible Causes

Faulty A/C Clutch Relay,A/C Clutch Relay harness is open or shorted,A/C Clutch Relay circuit poor electrical connection

P1545 ISUZU Description

Ignition voltage is supplied directly to the Air Condition (A/C) compressor clutch relay coil. The Powertrain Control Module (PCM) controls the relay by grounding the control circuit via an internal switch called a driver. The primary function of the driver is to supply the ground for the controlled component. Each driver has a fault line which the PCM monitors. When the PCM commands a component ON, the voltage of the control circuit should be low (near 0 volts). When the PCM is commanding the control circuit to a component OFF, the voltage potential of the circuit should be high (near battery voltage).