P1722
DTC P1722 - AUTOMATIC TRANSMISSION DIAGNOSIS INPUT SIGNAL CIRCUIT HIGH INPUTDTC DETECTING CONDITION:
- Two consecutive driving cycles with fault.
CAUTION: After repair or replacement of faulty parts, conduct CLEAR MEMORY MODE and INSPECTION MODE. Refer to How To Clear Diagnostic Trouble Codes.
WIRING DIAGRAM
11DF1: CHECK TRANSMISSION TYPE.
CHECK: Is transmission type AT?
YES: Go to step 11DF2.
NO: Check AT/MT identification circuit.
11DF2: CHECK HARNESS BETWEEN ECM AND TCM CONNECTOR.
1. Turn ignition switch to ON.
Connector & terminal (B135) No.4 (+) - Chassis ground (-):
2. Measure voltage between ECM and chassis ground.
CHECK: Is the voltage more than 10 Volt?
YES: Repair battery short circuit in harness between ECM and TCM connector. After repair, replace ECM.
NO: Go to step 11DF3.
11DF3: CHECK HARNESS BETWEEN ECM AND TCM CONNECTOR.
Connector & terminal (B135) No.4 (+) - Chassis ground (-):
Measure voltage between ECM connector and chassis ground.
CHECK: Is the voltage more than 4 Volt?
YES: Go to step 11DF6.
NO: Go to step 11DF4.
11DF4: CHECK HARNESS BETWEEN ECM AND TCM CONNECTOR.
Connector & terminal (B135) No.4 (+) - Chassis ground (-):
Measure voltage between ECM connector and chassis ground.
CHECK: Is the voltage less than 1 Volt?
YES: Repair poor contact in ECM connector.
NO: Go to step 11DF5.
11DF5: CHECK OUTPUT SIGNAL FROM ECM.
Connector & terminal (B135) No.4 (+) - Chassis ground (-):
Measure voltage between ECM and chassis ground.
CHECK: Does the voltage change from 1 Volt to 4 Volt while monitoring the value with voltage meter?
YES: Even if MIL lights up, the circuit has returned to a normal condition at this time.
NOTE: In this case, repair the following:
- Poor contact in ECM connector
- Poor contact in TCM connector
NO: Contact with Subaru of America (SOA) service.
NOTE: Inspection by Subaru of America's DTM is required, because probable cause is deterioration of multiple parts.
11DF6: CHECK HARNESS BETWEEN ECM AND TCM CONNECTOR.
Connector & terminal (B54) No.4 (+) - Chassis ground (-):
Measure voltage between TCM and chassis ground.
CHECK: Is the voltage more than 4 Volt?
YES: Go to step 11DF7.
NO: Repair open circuit in harness between ECM and TCM connector.
11DF7: CHECK POOR CONTACT.
Check poor contact in TCM connector.
CHECK: Is there poor contact in TCM connector?
YES: Repair poor contact in TCM connector.
NO: Check TCM power supply line and grounding line.