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Home >> Mazda >> 1995 >> RX7 2RTR-1308cc 80 >> Repair and Diagnosis >> Transmission and Drivetrain >> Automatic Transmission/Transaxle >> Testing and Inspection >> Initial Inspection and Diagnostic Overview >> Troubleshooting Tips >> Input Devices
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Input Devices


A/C Signal
- If the wiring is open, normal mode, A/C ON is selected because an ON A/C signal is judged.
- If the wiring is shorted, normal mode, A/C OFF is selected because an OFF A/C signal is judged.

Barometric Pressure Sensor
- If the wiring is open or shorted, diagnostic trouble code No.58 is displayed by the on-board diagnosis. Line pressure is not controlled correctly at high altitude and shift shock will be strong.

Brake Switch
- If the wiring of the brake switch is open or shorted, TCM control is made normal.
- If the wiring is shorted to the battery power, there may be a shift from fourth gear to third gear when the throttle valve is at the closed throttle position.

Engine RPM Signal
- If there is no input signal from the engine rpm signal, diagnostic trouble code No.01 is displayed by the on-board diagnosis and HOLD mode is canceled.
- If a malfunction occurs in the engine rpm signal, torque converter clutch shock may be slightly strong.

HOLD Switch
- If the wiring of the HOLD switch is open or shorted, selection to/from HOLD mode is not possible.

Idle Signal
- If the wiring is open, the transmission control module does not correct the throttle characteristics. In this case, torque converter clutch is not canceled when cruising (closed throttle position) and vehicle jolts when accelerator pedal is depressed or released.
- If the wiring is shorted, the line pressure will be low (does not match throttle characteristics) and the transmission may slip when shifting.

Input/Turbine Speed Sensor
- If no input signal from the input/turbine speed sensor, diagnostic trouble code No.55 is displayed by the on-board diagnosis and HOLD mode is canceled.
- If a malfunction occurs in the input/turbine speed sensor, the torque reduction control function is inhibited.

The gear position at shifting cannot be determined and timing control at shifting is made based on signals from output speed sensor. Shift shock may be slightly strong.

4GR Inhibit Signal (ASC Signal)
- If the wiring is open, there is no input signal from the cruise control unit and acceleration feeling (driving performance) will be deteriorated when the vehicle speed drops 8km/h (5mph) below the set speed or RESUME/ACCEL switch is operated during cruise control operation.
- If the wiring is shorted, there is no shift to fourth gear.

Mileage Switch
- If the wiring is open, the line pressure characteristics will be slightly high. Shift shock may be slightly strong when shifting from first to second or from second to third gear.
- If the wiring is shorted, the transmission may slip when shifting from first to second or from second to third gear until the total mileage of the vehicle exceeds approximately 600 km (372 miles).

Output Speed Sensor
- If there is no input signal from output speed sensor, diagnostic trouble code No.06 is displayed by the on-board diagnosis and HOLD mode is canceled.
- Shifting is made based on signals from vehicle speedometer sensor.
- If a malfunction occurs in output speed sensor and vehicle speedometer sensor at the same time, shift solenoid A and B go OFF and D and S ranges become in third gear position, L range becomes in second gear position, and torque converter clutch is inhibited.

Reduce Torque Signal
- If the wiring is open or shorted, diagnostic trouble code No.57 is displayed by the on-board diagnosis and HOLD mode is canceled.
- If a malfunction occurs in the reduce torque signal, the torque reduction control function is inhibited and line pressure will be high at shifting. Shift shock may be slightly strong.
- If a malfunction occurs in the torque reduced signal or slip torque converter clutch signal, diagnostic trouble code No.57 is displayed by the on-board diagnosis.

Slip Torque Converter Clutch Signal
- If the wiring is open or shorted, diagnostic trouble code No.57 is displayed by the on-board diagnosis and HOLD mode is canceled.
- If a malfunction occurs in the slip torque converter clutch signal, the torque reduction control function is inhibited and line pressure will be high at shifting. Shift shock may be slightly strong.
- If a malfunction occurs in the torque reduced signal or reduce torque signal, diagnostic trouble code No.57 is displayed by the on-board diagnosis.

Slip Torque Converter Clutch OFF Signal
- If the wiring of the slip torque converter clutch OFF signal is open or shorted, TCM control is made normal.

TAT Terminal (Data Link Connector)
- If the wiring is open, diagnostic trouble code(s) are not displayed by the on-board diagnosis.
- If the wiring is shorted, diagnostic trouble code(s) memorized in the transmission control module are displayed by HOLD indicator light.

Throttle Position Sensor
- If the wiring of the throttle position sensor is open or shorted, diagnostic trouble code No.12 is displayed by the on-board diagnosis, and HOLD mode is canceled.




- If a malfunction occurs in the throttle position sensor, the transmission control module judges the throttle opening signals from the idle signal, and sets the line pressure as follows:

Torque Reduced Signal
- If the Wiring is open or shorted, diagnostic trouble code No.57 is displayed by the on-board diagnosis and HOLD mode is canceled.
- If a malfunction occurs in the torque reduced signal, the torque reduction control function is inhibited and the line pressure characteristics will be high when shifting. Shift shock may be slightly strong.
- If a malfunction occurs in the reduce torque signal or slip torque converter clutch operation signal, diagnostic trouble code No.57 is displayed by the on-board diagnosis.

Transmission Fluid Temperature Sensor
- If the wiring is open, diagnostic trouble code No.56 is memorized by the on-board diagnosis. Line pressure is set at maximum and Fourth gear and torque converter clutch are inhibited.
- If the wiring is shorted, diagnostic trouble code No.56 is memorized by the on-board diagnosis. Shift shock at low ATF temperature may be strong.

Transmission Range Switch
- If a malfunction occurs in the wiring of the transmission range switch, the transmission control module cannot determine the range position, and shifting may be abnormal in D, S, and L ranges. There may not be a shift to fourth gear.

Vehicle Speedometer Sensor
- If there is no input signal from vehicle speedometer sensor, diagnostic trouble code No.07 is displayed by the on-board diagnosis, and HOLD mode is canceled.
- If a malfunction occurs in vehicle speedometer sensor, shifting is made normal based on signals from the output speed sensor.
- If a malfunction occurs in output speed sensor and vehicle speedometer sensor at the same time, shift solenoid A and B go OFF and D and S ranges become in third gear position, L range becomes in second gear position, and torque converter clutch is inhibited.

Water Thermoswitch
- If the wiring of the water thermoswitch is open or shorted, TCM control is made normal.
- If the wiring is shorted, the engine coolant temperature may increase.

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