2022 Subaru WRX Base, Automatic CVT TransFACTORY OEM SERVICE PROCEDURE

Diagnostic Method

Judge as NG when the following conditions are established.

JUDGMENT VALUE SPECIFICATION (DIAGNOSIS 1-1 AND 1-2)

Malfunction Criteria Threshold Value
Instruction value Different from expected value
JUDGMENT VALUE SPECIFICATION (DIAGNOSIS 2)

Malfunction Criteria Threshold Value
Process flow result The result and expected value do not match.
JUDGMENT VALUE SPECIFICATION (DIAGNOSIS 3)

Malfunction Criteria Threshold Value
High integrated IC motor continuity cut demand Yes
JUDGMENT VALUE SPECIFICATION (DIAGNOSIS 4)

Malfunction Criteria Threshold Value
Driving IC bus signal No change
JUDGMENT VALUE SPECIFICATION (DIAGNOSIS 5)

Malfunction Criteria Threshold Value
Writing value to CAN register Not equal to the reading value
JUDGMENT VALUE SPECIFICATION (DIAGNOSIS 6)

Malfunction Criteria Threshold Value
Absolute throttle position - Absolute throttle position memory when monitoring 1.6% or more
JUDGMENT VALUE SPECIFICATION (DIAGNOSIS 7)

Malfunction Criteria Threshold Value
Data written in CPU Not equal to expected value
JUDGMENT VALUE SPECIFICATION (DIAGNOSIS 8)

Malfunction Criteria Threshold Value
Data written in register Not equal to the reading value
JUDGMENT VALUE SPECIFICATION (DIAGNOSIS 9)

Malfunction Criteria Threshold Value
Diagnostic Value (DV) 1900 kW or more
NOTE:

Calculate DV as follows.Β 

  • When (Actual engine output - Target engine output) is equal to or greater than Map value:Β 

    DV = Ξ£(Actual engine output - Target engine output)Β 

  • When less than (Actual engine output - Target engine output) - Map value:Β 

    DV = Ξ£[(Actual engine output - Target engine output) - Map value]Β 

 Β 
MAP SPECIFICATION

Vehicle speed (km/h (MPH)) 0
(0)		 10
(6.25)		 20
(12.5)		 30
(18.75)		 40
(25)		 50
(31.25)		 60
(37.5)		 70.4
(43.75)		 80.5
(50)		 91
(56.25)		 101
(62.5)
Engine output (kW) 26 26 26 26 30 40 60 85 120 160 200

Time needed for diagnosis:Β 

Diagnosis 1-1: 2 times

Diagnosis 1-2: 8 times

Diagnosis 2: 504 ms

Diagnosis 3: 48 ms

Diagnosis 4: 2500 ms

Diagnosis 5: Less than 1 s

Diagnosis 6: 24 ms

Diagnosis 7: 2 times

Diagnosis 8: 2 times

Diagnosis 9: Less than 1 s

Malfunction indicator light illumination:Β  Illuminates as soon as a malfunction occurs.

Factory Service Tools

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When to See a Mechanic

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

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

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