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HOMESERVICE MANUALSSUBARU2022IMPREZA BASE, 4D SEDAN, AUTOMATIC CVT TRANSREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 16 (P-HEV HYBRID POWERTRAIN CONTROL SYSTEM (DIAGNOSTICS) (1 OF 4))DIAGNOSIS SYSTEMINSPECTIONINSPECTION OF EACH SYSTEM
2022 Subaru Impreza Base, 4D Sedan, Automatic CVT Trans

Inspection Of Each System

2022 Subaru Impreza Base, 4D Sedan, Automatic CVT TransSECTION Inspection Of Each System
WARNING: This page is about a different car, the 2022 Subaru Crosstrek. However, it is still accessible from the selected car via links, so may be relevant.

Below are shown the inspection range and main inspection contents for each system inspection.

INSPECTION RANGE FOR EACH SYSTEM INSPECTION

G13237892Courtesy of SUBARU OF AMERICA, INC.

Inspection contents of each system inspection

System inspection Possibility of malfunction Contents of inspection
Cooling System Temperature is extremely high.
  • Grille clogged state
  • Coolant level
  • Check if there is a possibility that the coolant has frozen when a malfunction occurs.
  • Coolant hose clogged state
  • HV radiator fan operating state
Shut Down Signal Circuit Shutdown signal Open or short circuit of shutdown signal communication line between Hybrid vehicle control ECU assembly and Motor generator control ECU
Inverter low-voltage circuit Power supply from +B voltage or communication between Hybrid vehicle control ECU assembly and Motor generator control ECU
  • Open or short circuit state of communication line between Hybrid vehicle control ECU assembly and Motor generator control ECU
  • Open or short circuit state of +B and GND line
  • Fuse blown state
HV BATTERY HIGH-VOLTAGE LINE CIRCUIT High voltage power supply from HV battery Open or short circuit state of "system main relay, connector and cable"
MOTOR RESOLVER CIRCUIT Motor resolver signal Open or short circuit state of "Motor resolver body, connector and cable"
GENERATOR RESOLVER CIRCUIT Generator resolver signal Open or short circuit state of "Generator resolver body, connector and cable"
MOTOR HIGH-VOLTAGE CIRCUIT Motor output Open or short circuit state of "motor body, T/M bus bar, terminal block and cable"
GENERATOR HIGH-VOLTAGE CIRCUIT Generator output Open or short circuit state of "generator body, T/M bus bar, terminal block and cable"
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.