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. Clear Memory Mode
WIRING DIAGRAM
10DF1: CHECK TRANSMISSION TYPE.
CHECK: Is transmission type AT?
YES: Go to step 10DF2.
NO: Check AT/MT identification circuit.
10DF2: 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 V?
YES: Repair battery short circuit in harness between ECM and TCM connector. After repair, replace ECM.
NO: Go to step 10DF3.
10DF3: 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 V?
YES: Go to step 10DF6.
NO: Go to step 10DF4.
10DF4: 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 V?
YES: Repair poor contact in ECM connector.
NO: Go to step 10DF5.
10DF5: 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 V to 4 V 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 DIM is required, because probable cause is deterioration of multiple parts.
10DF6: 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 V?
YES: Go to step 10DF7.
NO: Repair open circuit in harness between ECM and TCM connector.
10DF7: 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.