AA80E Automatic Transmission: Automatic Transmission System

AA80E AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMISSION SYSTEM: P0500: Vehicle Speed Sensor "A"

DTC P0500 - Vehicle Speed Sensor "A"

DTC P0502 - Vehicle Speed Sensor "A" Circuit Low

DTC P0503 - Vehicle Speed Sensor "A" Intermittent / Erratic / High

DESCRIPTION

The speed sensor (SP2) detects the output axis rotation speed and inputs it into the TCM as a signal.
Based on the speed sensor (NT) signal and the speed sensor (SP2) signal, the TCM controls engine torque and shift timing.









MONITOR DESCRIPTION

The output speed sensor SP2 monitors the output shaft speed.
The ECM controls the gearshift point and the lock up timing based on the signals from the output speed sensor SP2 and throttle position sensor.
If the ECM detects no signal from the output shaft speed sensor SP2 even while the vehicle is moving, it will conclude that is a malfunction of the output speed sensor SP2.
The ECM will illuminate the MIL and set a DTC.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS

All





P0500:





TYPICAL MALFUNCTION THRESHOLDS

P0500:





P0502:





P0503:





COMPONENT OPERATING RANGE





WIRING DIAGRAM





INSPECTION PROCEDURE
HINT: Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals may be discovered before parts or wiring is disturbed. Reading the Data List information early in troubleshooting is one way to save diagnostic time.
NOTE:
In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not.

1 Warm up the engine.
2 Turn the engine switch off.
3 Connect the Techstream to the DLC3.
4 Turn the engine switch on (IG).
5 Turn the Techstream on.
6 Enter the following menus: Powertrain / ECT / Data List.
7 According to the display on the Techstream, read the Data List.

TCM:





HINT:
- SPD (SP2) is always 0 while driving: Open or short in the sensor or circuit.
- The SPD (SP2) value displayed on the tester is much lower than the actual vehicle speed: Sensor trouble, improper installation, or intermittent connection trouble of the circuit.

PROCEDURE

1. CHECK SPEED SENSOR TERMINAL (SP2 TERMINAL)




(a) Disconnect the transmission wire connector.
(b) Turn the engine switch on (IG).
(c) Measure the voltage of the wire harness side connector.
Standard voltage:





(d) Measure the resistance of the wire harness side connector.
Standard resistance:






NG -- CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - TCM)
OK -- Continue to next step.

2. INSPECT TRANSMISSION WIRE (SPEED SENSOR SP2)




(a) Disconnect the speed sensor (SP2) connector.
(b) Disconnect the transmission wire connector.
(c) Measure the resistance of the transmission wire.
Standard resistance:






NG -- REPAIR OR REPLACE TRANSMISSION WIRE
OK -- REPLACE SPEED SENSOR
3. CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - TCM)




(a) Disconnect the transmission wire connector.
(b) Disconnect the TCM connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

4. REPLACE TCM
(a) Replace the TCM Removal.
NEXT -- PERFORM A/T CODE REGISTRATION