Input Speed Sensor A

INPUT SPEED SENSOR A

Description
The input speed sensor detects forward clutch drum rpm (revolutions per minute). It is located on the input side of the automatic transaxle. The output speed sensor is located on the output side of the automatic transaxle. With the two sensors, input and output rpms are accurately detected. As a result, optimal shift timing during deceleration and shift quality can be improved.

CONSULT-III Reference Value in Data Monitor Mode

On Board Diagnosis Logic
- This is not an OBD-II self-diagnostic item.
- Diagnostic trouble code "INPUT SPEED SENSOR A" with CONSULT-III or 10th judgement flicker without
CONSULT-III is detected when TCM does not receive the proper voltage signal from the sensor.

Possible Cause
- Harness or connector
(The sensor circuit is open or shorted.)
- Input speed sensor

DTC Confirmation Procedure

CAUTION:
- Always drive vehicle at a safe speed.
- Be careful not to rev engine into the red zone on the tachometer.
- If performing this "DTC Confirmation Procedure" again, always turn ignition switch OFF and wait at least 10 seconds before continuing.
After the repair, perform the following procedure to confirm the malfunction is eliminated.

WITH CONSULT-III
1. Start engine.
2. Select "DATA MONITOR" mode for "TRANSMISSION" with CONSULT-III.
3. Touch "START".
4. Drive vehicle under the following conditions for more than 5 seconds.
SLCT LVR POSI: "D" position
VEHICLE SPEED: Higher than 40 km/h (25 MPH)
ENGINE SPEED: Higher than 1,500 rpm
THROTTLE POSI: Greater than 1.0/8 of the full throttle position
5. If the check result is NG, go to SEE Diagnosis Procedure .

WITHOUT CONSULT-III
1. Start engine.
2. Drive vehicle under the following conditions for more than 5 seconds.
Selector lever position: "D" position
Vehicle speed: Higher than 40 km/h (25 MPH)
Engine speed: Higher than 1,500 rpm
Throttle position: 1.0/8 of the full throttle position
3. Perform self-diagnosis. Automatic Transmission .
4. If the check result is NG, go to SEE Diagnosis Procedure .

Wiring Diagram - AT - PT/SEN

TCM TERMINALS AND REFERENCE VALUES
Automatic Transmission.

Diagnosis Procedure
1.CHECK INPUT SIGNAL
With CONSULT-III
1. Start engine.
2. Select "TCM INPUT SIGNALS" in "DATA MONITOR" mode for "TRANSMISSION" with CONSULT-III.
3. Read out the value of "INPUT SPEED" while driving. Check the value changes according to driving speed.

OK or NG
OK - GO TO 8.
NG - GO TO 2.
2. CHECK INPUT SPEED SENSOR
With CONSULT-III
1. Start engine.
2. Check power supply to input speed sensor by voltage between TCM connector terminals. Main Power Supply And Ground Circuit and SEE Wiring Diagram - AT - PT/SEN .

3. If OK, check the pulse when vehicle cruises.

OK or NG
OK - GO TO 8.
NG - GO TO 3.
3. CHECK POWER AND SENSOR GROUND
1. Turn ignition switch OFF.
2. Disconnect the input speed sensor harness connector.
3. Turn ignition switch ON.

4. Check voltage between input speed sensor harness connector terminals.

5. Check voltage between input speed sensor harness connector terminal and ground.

6. If OK, check harness for short to ground and short to power.
7. Reinstall any part removed.
OK or NG
OK - GO TO 4.
NG - 1 - Battery voltage is not supplied between terminals 1 and 3, terminals 1 and ground: GO TO 6.
NG - 2 - Battery voltage is not supplied between terminals 1 and 3 only: GO TO 7.
4. CHECK HARNESS BETWEEN TCM AND INPUT SPEED SENSOR
1. Turn ignition switch OFF.
2. Disconnect the input speed sensor harness connector.

3. Check continuity between TCM connector (A) terminal and input speed sensor harness connector (B) terminal.

4. If OK, check harness for short to ground and short to power.
5. Reinstall any part removed.
OK or NG
OK - GO TO 5.
NG - Repair open circuit or short to ground or short to power in harness or connectors.
5.CHECK TCM
1. Check TCM input/output signal. Automatic Transmission .
2. If NG, re-check TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK - GO TO 8.
NG - Repair or replace damaged parts.
6. CHECK HARNESS BETWEEN TCM AND INPUT SPEED SENSOR (POWER)
1. Turn ignition switch OFF.
2. Disconnect the input speed sensor harness connector.

3. Check continuity between TCM connector (A) terminals and input speed sensor harness connector (B) terminal. Automatic Transmission and Main Power Supply And Ground Circuit.

4. If OK, check harness for short to ground and short to power.
5. Reinstall any part removed.
OK or NG
OK - 10A fuse (No.49, located in the IPDM E/R) or ignition switch are malfunctioning.
NG - Repair open circuit or short to ground or short to power in harness or connectors.
7. CHECK HARNESS BETWEEN TCM AND INPUT SPEED SENSOR (GROUND)
1. Turn ignition switch OFF.
2. Disconnect the input speed sensor harness connector.

3. Check continuity between TCM connector (A) terminal and input speed sensor harness connector (B) terminal.