Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSSUBARU2022IMPREZA BASE, 4D SEDAN, AUTOMATIC CVT TRANSREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISAUTO START STOP (DIAGNOSTICS)DIAGNOSTICS WITH PHENOMENONINSPECTIONLIST OF CHECK ITEMS CLASSIFIED BY SYMPTOMS

2022 Subaru Impreza Base, 4D Sedan, Automatic CVT Trans

List Of Check Items Classified By Symptoms

2022 Subaru Impreza Base, 4D Sedan, Automatic CVT TransSECTION List Of Check Items Classified By Symptoms

NOTE:

Perform the diagnosis by comparing the vehicle's data monitor with each condition of Auto Start Stop. Ref. to AUTO START STOP (DIAGNOSTICS)>DATA MONITOR .
Each signal check includes the harness condition check and connector condition check.

Check target		Display	Judging item	Check item
Symptom 1	Symptom 2	Display	Judging item	Check item
◦	◦	ECM Idle Stop Prohibition	Judgment of prohibited condition by ECM	ECM CAN communication condition
◦	◦	Low water temperature stop prohibition judgment Coolant Temp.	Judgment that engine coolant temperature is low	Engine coolant temperature sensor signal ECM input judgment CAN communication condition
◦	◦	Battery current prohibition judgment Battery Charge/Discharge Current	Judgment that electric load is large	Battery sensor signal ECM input judgment CAN communication condition
◦	◦	Battery high temperature prohibition judgment Battery low temperature prohibition judgment Estimated Battery Temperature	Judgment that battery temperature is high or low	Battery sensor signal ECM input judgment CAN communication condition
◦	◦	Brake vacuum restart request evaluation Brake Booster Relative Pressure	Judgment that brake booster vacuum pressure is insufficient	Brake booster Brake booster pressure sensor output signal VDC control module input judgment CAN communication condition
◦	◦	Prohibition judgment by the atmospheric pressure condition Atmosphere Pressure	Judgment that altitude is high	Manifold absolute pressure sensor signal ECM input judgment CAN communication condition
◦	◦	Idle Switch(Accel)	Judgment that accelerator pedal is depressed	Accelerator pedal position sensor signal ECM input judgment CAN communication condition
◦	-	Engine rotation prohibition judgment Engine Speed(Auto Start Stop)	Judgment that it is idling trouble	Engine speed signal ECM input judgment CAN communication condition
◦	-	Shift position information	Judgment that select lever is in a range other than "D"	Inhibitor switch signal TCM CAN communication condition
-	◦	Shift position information	Judgment that select lever is in "R" range	Inhibitor switch signal TCM CAN communication condition
◦	◦	Vehicle speed restart request evaluation Vehicle Speed	Judgment that the vehicle is traveling	Vehicle speed sensor signal VDC control module input judgment CAN communication condition
◦	◦	Brake fluid pressure	Judgment that brake fluid pressure is insufficient	Pressure sensor signal VDC control module input judgment CAN communication condition
◦	-	Inclination prohibition judgment Forward and Rearward G	Judgment that road surface inclination is out of condition	Yaw rate and G sensor signal VDC control module input judgment CAN communication condition
◦	-	(ABS operation, No display)	Judgment that ABS operates before vehicle stops	VDC control module control condition CAN communication condition
◦	◦	Steering angle prohibition judgment Steering Angle Sensor(Auto Start Stop)	Judgment that steering angle is large or steering wheel is being turned	Steering angle sensor signal VDC control module input judgment CAN communication condition
◦	◦	EPS restart request judgment EPS idle stop prohibition		Torque sensor signal Power steering control module input judgment CAN communication condition
◦	◦	A/C Idle Stop Permission Air-conditioning prohibition evaluation Air conditioning restart request evaluation	Judgment of air conditioner prohibition condition	Air conditioner CAN communication condition
◦	-	Seat Belt Buckle Switch (D Seat Side)	Judgment that driver's seat belt is not fastened	Seat belt switch signal Combination meter input judgment CAN communication condition
◦	◦	Electric accessories restart request evaluation	Judgment of prohibited condition of turn signal or wiper	Auto Start Stop customize setting condition
		Turn signal evaluation		Turn signal light signal Combination meter input judgment CAN communication condition
		(Wiper judgment, No display)		Wiper switch signal Body integrated unit input judgment CAN communication condition
◦	◦	Rear Defogger Air-conditioning prohibition evaluation	Judgment that rear defogger is turned on	Rear defogger switch signal Combination meter input judgment Body integrated unit control condition CAN communication condition
◦	-	Door SW (D Seat Side)	Judgment that driver's door is opened	Door switch signal Body integrated unit input judgment CAN communication condition
◦	◦	DC/DC Converter Temperature Prohibition Evaluation DC/DC Converter 1 Status	Judgment of sub power supply temperature warning condition	DC/DC converter
◦	-	Hood open evaluation Hood SW Hood diagnosis signal	Judgment that front hood lock is released	Hood switch signal Body integrated unit input judgment CAN communication condition
◦	◦	Cancel status Auto Start Stop OFF Switch	Judgment of Auto Start Stop cancel switch operation	Auto Start Stop cancel switch signal Combination meter input judgment
◦	◦	Voltage drop prohibition evaluation at the time of start Main power supply voltage	Judgment that voltage decrease is large during starting	Battery (deterioration, capacity decrease) Non-genuine electrical parts (electric load is large) TCM input judgment
◦	◦	Battery protection restart request evaluation Main power supply voltage Audio Supply Voltage	Judgment of prohibited condition of battery protection	Battery (deterioration, capacity decrease) Non-genuine electrical parts (electric load is large) ECM input judgment
		Battery Charge/Discharge Current		Battery sensor signal ECM input judgment CAN communication condition
		DC/DC Converter 1 Status		DC/DC converter input signal (input terminal voltage)
◦	-	Engine Speed Complete combustion evaluation Engine stall evaluation Key start completion evaluation	Judgment of engine stop condition	Engine speed signal ECM output judgment
◦	◦	Stop Light Switch	Judgment that brake pedal is released	Stop light switch signal TCM input judgment
◦	◦	EPB Idle stop prohibition EPB restart request judgment	Judgment that electronic parking brake is activated	Electronic parking brake operation status

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.