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DTC P1500: AC Inverter Malfunction: Description

This vehicle is equipped with a voltage inverter, which supplies power to various electrical appliances. When the main switch of the voltage inverter is turned ON, the inverter relay turns ON, and the inverter then converts the 12 V Direct Current (DC) of the battery into an 115 V Alternating Current (AC). The voltage inverter can output a maximum of 400 W from an outlet.

When the AC 115 V is output, a load is applied to the engine. The ECM controls the engine idling speed according to the vehicle speed and engine load. A speed signal is input to the inverter and an idle-up signal is transmitted to the ECM.

Fig 1: Identifying AC Inverter Circuit Diagram
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DTC DETECTION CONDITIONS AND TROUBLE AREA REFERENCE

DTC No. DTC Detection Conditions Trouble Areas
P1500 While vehicle running, idle-up signal input to ECM for 10 seconds
(2 trip detection logic)
  • Open or short in speed signal circuit
  • Short between idle-up signal and +B circuits
  • Voltage inverter
  • ECM