DTC 38 Torque Control Signal

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

DIAGNOSIS:

The signal circuit is open or shorted.

TROUBLE SYMPTOM:

Excessive shift shock.

WIRING DIAGRAM:

Fig 1: Torque Control Signal - Wiring Diagram

G04990733

Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE CHART

Step	Check	Yes	No
1 CHECK HARNESS CONNECTOR BETWEEN TCM AND ECM. Turn the ignition switch to OFF. Disconnect the connectors from TCM and ECM. Measure the resistance of harness between TCM and ECM connector. Connector & terminal (B54) No. 21 - (B136) No. 18: (B54) No. 13 - (B136) No. 1:	Is the resistance less than 1 Ω?	Go to step 2.	Repair the open circuit in harness between TCM and ECM connector.
2 CHECK HARNESS CONNECTOR BETWEEN TCM AND ECM. Measure the resistance of harness between TCM connector and chassis ground. Connector & terminal (B54) No. 21 - Chassis ground: (B54) No. 13 - Chassis ground:	Is the resistance more than 1 MΩ?	Go to step 3.	Repair the short circuit in harness between TCM and ECM connector.
3 CHECK OUTPUT SIGNAL EMITTED FROM TCM. Connect the connectors to TCM and ECM. Turn the ignition switch to ON (engine OFF). Measure the voltage between TCM connector terminals. Connector & terminal (B54) No. 21 (+) - Chassis ground (-): (B54) No. 13 (+) - Chassis ground (-):	Is the voltage more than 4.8 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 connector in TCM and ECM.	Go to step 4.
4 CHECK POOR CONTACT.	Is there poor contact in torque control signal circuit?	Repair the poor contact.	Go to step 5.
5 CHECK GROUND LINE BETWEEN TRANSMISSION AND BODY. Check installing condition of the ground line in transmission and body.	Is there any dirt or rust at the ground line installing point?	Remove dirt and rust.	Go to step 6.
6 CHECK GROUND LINE BETWEEN TRANSMISSION AND BODY. Check installing condition of the ground line in transmission and body. Tightening torque: 10 - 16 N.m (1.0 - 1.6 kgf-m, 7.2 - 11.6 ft-lb)	Is the tightening torque value within specification?	Go to step 7.	Tighten to the specified torque.
7 CHECK GROUND LINE INSIDE TRANSMISSION. Drain the ATF and remove oil pan. Check the tightening torque value of ground line installing bolt. Tightening torque: 7 - 9 N.m (0.7 - 0.9 kgf-m, 5.1 - 6.5 ft-lb)	Is the tightening torque value within specification?	Go to step 9.	Tighten to the specified torque.
8 CHECK GROUND CIRCUIT OF ECM. < Ref. to DTC 31 THROTTLE POSITION SENSOR , Diagnostic Procedure with Diagnostic Trouble Code (DTC). >	Is there any trouble?	Repair the ground terminal and/or ground circuit of ECM.	Go to step 9.
9 RECHECK OUTPUT SIGNAL EMITTED FROM TCM. Measure the voltage between TCM connector and chassis ground. Connector & terminal (B54) No. 21 (+) - Chassis ground (-): (B54) No. 13 (+) - Chassis ground (-):	Is each voltage more than 4 V?	Replace the TCM. < Ref. to TRANSMISSION CONTROL MODULE (TCM) . >	Replace the ECM.