DTC 73 Low Clutch Timing Solenoid

WARNING: This page is about a different variant/trim than selected.

DIAGNOSIS:

The output signal circuit of low clutch timing solenoid is open or shorted.

TROUBLE SYMPTOM:

Excessive shift shock.

WIRING DIAGRAM:

Fig 1: Low Clutch Timing Solenoid - Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE CHART

Step	Check	Yes	No
1 CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION. Turn the ignition switch to OFF. Disconnect the connector from TCM and transmission. Measure the resistance of harness between TCM and transmission connector. Connector & terminal (B54) No. 14 - (B11) No. 3:	Is the resistance less than 1 Ω?	Go to step 2.	Repair the open circuit in harness between TCM and transmission connector.
2 CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION. Measure the resistance of harness between TCM connector and transmission ground. Connector & terminal (B54) No. 14 - Chassis ground:	Is the resistance more than 1 MΩ?	Go to step 3.	Repair the short circuit in harness between TCM and transmission connector.
3 CHECK LOW CLUTCH TIMING SOLENOID. Measure the resistance between transmission connector terminals. Connector & terminal (T4) No.3 - No. 16:	Is the resistance 10 - 16 Ω?	Go to step 4.	Go to step 7.
4 CHECK OUTPUT SIGNAL EMITTED FROM TCM. Connect the connectors to TCM and transmission. Turn the ignition switch to ON (engine OFF). Move the select lever to "D" range. Measure the voltage between TCM connector and chassis ground. Connector & terminal (B54) No. 14 (+) - Chassis ground (-):	Is the voltage more than 9 V?	Go to step 5.	Go to step 6.
5 CHECK OUTPUT SIGNAL EMITTED FROM TCM. Set the select lever to "2" range. Measure the voltage between TCM connector and chassis ground. Connector & terminal (B54) No. 14 (+) - Chassis ground (-):	Is the voltage less than 1 V?	Even if the AT OIL TEMP warning light blinks, the circuit has returned to a normal condition at this time. A temporary poor contact of the connector or harness may be the cause. Repair the harness or contact in TCM and transmission.	Go to step 6.
6 CHECK POOR CONTACT.	Is there poor contact in low clutch timing solenoid circuit?	Repair the poor contact.	Replace the TCM. < Ref. to TRANSMISSION CONTROL MODULE (TCM) . >
7 CHECK LOW CLUTCH TIMING SOLENOID (IN TRANSMISSION). Remove the transmission connector from bracket. Lift-up or raise the vehicle and support with safety stand. NOTE: Raise all wheels off ground. Drain the ATF. CAUTION: Do not drain the ATF until it cools down. Remove the oil pan, and disconnect connector from low clutch timing solenoid. Measure the resistance between low clutch timing solenoid connector and transmission ground. Terminals No. 1 - Transmission ground:	Is the resistance 10 - 16 Ω?	Go to step 8.	Replace the low clutch timing solenoid. < Ref. to SHIFT SOLENOIDS, DUTY SOLENOIDS AND ATF TEMPERATURE SENSOR . >
8 CHECK HARNESS CONNECTOR BETWEEN LOW CLUTCH TIMING SOLENOID AND TRANSMISSION. Measure the resistance of harness between low clutch timing solenoid and transmission connector. Connector & terminal (AT9) No. 1 - (T4) No. 3:	Is the resistance less than 1 Ω?	Go to step 9.	Repair the open circuit in harness between low clutch timing solenoid and transmission connector.
9 CHECK HARNESS CONNECTOR BETWEEN LOW CLUTCH TIMING SOLENOID AND TRANSMISSION. Measure the resistance of harness between low clutch timing solenoid connector and transmission ground. Connector & terminal (T4) No. 3 - Transmission ground:	Is the resistance more than 1 MΩ?	Even if the AT OIL TEMP warning light blinks, the circuit has returned to a normal condition at this time. A temporary poor contact of the connector or harness may be the cause. Repair the harness or connector in low clutch timing solenoid and transmission.	Repair the short circuit harness between low clutch timing solenoid and transmission connector.