Transmission Control Systems
TROUBLE CODE 33: VEHICLE SPEED SENSOR 2DIAGNOSIS:
The harness connector between TCM and vehicle speed sensor is in short or open.
TROUBLE SYMPTOM:
Improper shift point
FLOW CHART
WIRING DIAGRAM
1. CHECK OPERATION OF SPEEDOMETER.
Make sure that speedometer indicates the vehicle speed by driving the vehicle.
2. CHECK HARNESS CONNECTOR BETWEEN TCM AND COMBINATION METER.
1) Turn ignition switch to OFF.
2) Remove combination meter.
3) Disconnect connectors from TCM and combination meter.
4) Measure resistance of harness connector between TCM and combination meter.
Connector & terminal / Specified resistance:
(B53) No. 11 - (i18) No. 8 / 1 ohms, or less
5) Measure resistance of harness connector between combination meter and body to make sure that circuit does not short.
Connector & terminal / Specified resistance:
(i18) No. 8 - Body / 1 Mohms or more
3. CHECK INPUT SIGNAL FOR TCM.
1) Connect connector to combination meter.
2) Install combination meter.
3) Lift-up the vehicle or set the vehicle on free roller.
CAUTION: On AWD models, raise all wheels off floor.
4) Start the engine and drive the wheels slowly.
5) Measure voltage between TCM and body.
Connector & terminal / Specified voltage:
(B53) No. 11 - Body / Less than 1 more than 4 V
NOTE: The speed difference between front and rear wheels may light either the ABS warning light, but this indicates no malfunctions. When AT control diagnosis is finished, perform the ABS memory clearance procedure of self-diagnosis system.
- Using Subaru select monitor:
(1) Connect connector to combination meter.
(2) Install combination meter.
(3) Connect connectors to TCM.
(4) Lift-up the vehicle or set the vehicle on tree roller.
(5) Turn ignition switch to OFF.
(6) Connect the Subaru select monitor to data link connector.
(7) Turn ignition switch to ON and Subaru select monitor switch to ON.
CAUTION: On AWD models, raise all wheels off floor.
(8) Start the engine, and drive the wheels.
(9) Read data on Subaru select monitor.
(10) Designate mode using function key.
Function mode: F04 or FO5
SPECIFIED DATA:
Compare speedometer with select monitor indications.
- F04: Vehicle speed is indicated in mile per hour (MPH).
- F05: Vehicle speed is indicated in kilometer per hour (km/h).
NOTE: The speed difference between front and rear wheels may light either the ABS warning light, but this indicates no malfunctions. When AT control diagnosis is finished, perform the ABS memory clearance procedure of self-diagnosis system.
- Using oscilloscope:
(1) Connect connector to combination meter.
(2) Install combination meter.
(3) Lift-up the vehicle or set the vehicle on free rollers.
CAUTION: On AWD models, raise all wheels off floor.
(4) Set oscilloscope to TCM connector terminals.
Connector & terminals: Positive probe; (B 53) No. 11 Earth lead; Body
(5) Start the engine.
(6) Shift on the gear position and keep the vehicle speed at constant.
(7) Measure signal voltage.
Specified voltage: 2 V, or more
NOTE:
- If vehicle speed increases the width of amplitude (W) decreases.
- The speed difference between front and rear wheels may light the ABS warning light but this indicates no malfunctions. When AT control diagnosis is finished, perform the ABS memory clearance procedure of self-diagnosis system.