DTC 11 Engine Speed Signal

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

DIAGNOSIS:

The engine speed input signal circuit is open or shorted.

TROUBLE SYMPTOM:

No lock-up (after engine warm-up).
The AT OIL TEMP warning light remains on when vehicle speed is "0".

WIRING DIAGRAM:

Fig 1: Engine Speed Input Signal - Wiring Diagram

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 (B55) No. 4 - (B134) No. 10:	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 (B55) No. 4 - 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 PREPARE SUBARU SELECT MONITOR.	Do you have a Subaru Select Monitor?	Go to step 5.	Go to step 4.
4 CHECK INPUT SIGNAL FOR TCM. Connect the connectors to TCM and ECM. Turn the ignition switch to ON (engine OFF). Measure the voltage between TCM connector and chassis ground. Connector & terminal (B55) No. 4 (+) - Chassis ground (-):	Is the voltage more than 10.5 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 6.
5 CHECK INPUT SIGNAL FOR TCM USING SUBARU SELECT MONITOR. Connect the connectors to TCM and ECM. Connect the Subaru Select Monitor to data link connector. Start the engine and turn Subaru Select Monitor switch to ON. Warm-up the engine until engine coolant temperature is above 80°C (176°F). Idle the engine. Read the data of engine speed using Subaru Select Monitor. Display shows the engine speed signal value sent from ECM.	Is the revolution value same as tachometer reading shown on combination meter?	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 6.
6 CHECK POOR CONTACT.	Is there poor contact in engine speed signal circuit?	Repair the poor contact.	Go to step 7.
7 CONFIRM DTC 11.	Replace the ECM with a new one. Does the DTC appear again, after memory has been cleared?	Replace the TCM. < Ref. to TRANSMISSION CONTROL MODULE (TCM) . >	Replace the ECM.