Operation CHARM: Car repair manuals for everyone.
Home >> Mazda >> 1994 >> RX7 2RTR-1308cc 80 >> Repair and Diagnosis >> Transmission and Drivetrain >> Automatic Transmission/Transaxle >> Testing and Inspection >> Initial Inspection and Diagnostic Overview >> Troubleshooting Tips >> Outline

Outline



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

Park/Neutral Switch
- If a malfunction occurs in the wiring of the park/neutral switch, the powertrain control module (transmission) 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.

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




- If a malfunction occurs in the throttle position sensor, the powertrain control module (transmission) judges the throttle opening signals from the idle signal, and sets the line pressure as shown above.

Idle Signal
- If the wiring is open, the powertrain control module (transmission) does not correct the throttle characteristics. In this case, lockup 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 trans- mission may slip when shifting.

Vehicle Speed Sensor
- If there is no input signal from vehicle speed sensor, diagnostic trouble code No.06 is displayed by the self-diagnosis function and hold mode is canceled.
- Shifting is made based on signals from vehicle speedometer sensor.
- If a malfunction occurs in vehicle speed sensor and vehicle speedometer sensor at the same time, shift A and B solenoid valve go OFF and D and S ranges become in Third gear position, L range becomes in 2nd gear position, and lockup is inhibited.

Vehicle Speedometer Sensor
- If there is no input signal from vehicle speedometer sensor, diagnostic trouble code No.07 is displayed by the self-diagnosis function, and hold mode is canceled.
- If a malfunction occurs in vehicle speedometer sensor, shifting is made normal based on signals from the vehicle speed sensor (revolution sensor).
- If a malfunction occurs in vehicle speed sensor and vehicle speedometer sensor at the same time, shift A and B solenoid valve go OFF and D and S ranges become in Third gear position, L range becomes in 2nd gear position, and lockup is inhibited.

Vehicle Speed Pulse Generator
- If no input signal from the vehicle speed pulse generator, diagnostic trouble code No.55 is displayed by the self-diagnosis function and hold mode is canceled.
- If a malfunction occurs in the vehicle speed pulse generator, 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 vehicle speed sensor (revolution sensor). Shift shock may be slightly strong.

Stoplight Switch
- If the wiring of the stoplight switch is open or shorted, PCMT 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.

Torque Reduced Signal
- If the wiring is open or shorted, diagnostic trouble code No.57 is displayed by the self-diagnosis function 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 lockup signal, diagnostic trouble code No.57 is displayed by the self-diagnosis function.

Mileage Switch
- If the wiring is open, the line pressure characteristics will be slightly high. Shift shock may be slightly strong when shifting from 1st to 2nd or from 2nd to Third gear.
- If the wiring is shorted, the transmission may slip when shifting from 1st to 2nd or from 2nd to Third gear until the total mileage of the vehicle exceeds approximately 600 km (372 miles).

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

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.

Slip Lockup OFF Signal
- If the wiring of the slip lockup OFF signal is open or shorted, PCMT control is made normal.

Engine RPM Signal
- If there is no input signal from the engine rpm signal, diagnostic trouble code No.01 is displayed by the self-diagnosis function and hold mode is canceled.
- If a malfunction occurs in the engine rpm signal, lockup shock may be slightly strong.

ATF Thermosensor
- If the wiring is open, diagnostic trouble code No.56 is memorized by the self-diagnosis function. Line pressure is set at maximum and Fourth gear and lockup are inhibited.
- If the wiring is shorted, diagnostic trouble code No.56 is memorized by the self-diagnosis function. Shift shock at low ATF temperature may be strong.

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

TAT Terminal (Data Link Connector)
- If the wiring is open, diagnostic trouble code(s) are not displayed by the self-diagnosis function.
- If the wiring is shorted, diagnostic trouble code(s) memorized in the powertrain control module (transmission) are displayed by hold indicator.

Shift A and B Solenoid Valve
- If the wiring is open or shorted, diagnostic trouble code No.60 for shift A solenoid valve or diagnostic trouble code No.61 for shift B solenoid valve is displayed and hold mode is canceled.
- If either solenoid valve malfunctions, both solenoid valves go OFF and D and S ranges become in Third gear position, L range becomes in 2nd gear position, and lockup is inhibited.

Line Pressure Solenoid Valve
- If the wiring is open or shorted, diagnostic trouble code No.64 is displayed by the self-diagnosis function and hold mode is canceled.
- If a malfunction occurs in the line pressure solenoid valve, line pressure is set at maximum to make driving possible.
- If a malfunction occurs in the dropping resistor, diagnostic trouble code No.64 is displayed by the self- diagnosis function.

Lockup Solenoid Valve
- If the wiring is open or shorted, diagnostic trouble code No.63 is displayed by the self-diagnosis function and hold mode is canceled.
- If a malfunction occurs in the lockup solenoid valve, the solenoid valve goes OFF and lockup is canceled.

Lockup Control Solenoid Valve
- If the wiring is open or shorted, diagnostic trouble code No.65 is displayed by the self-diagnosis function and hold mode is canceled.
- If a malfunction occurs in the lockup control solenoid valve, the solenoid valve goes OFF and lockup is canceled.

Overrunning Clutch Solenoid Valve
- If the wiring is open or shorted, diagnostic trouble code No.62 is displayed by the self-diagnosis function and hold mode is canceled.
- If a malfunction occurs in the overrunning clutch solenoid valve, the solenoid valve goes OFF and the overrunning clutch engages. Engine braking is available when coasting. There is no shift to Fourth gear.

Dropping Resistor
- If the wiring is open or shorted, diagnostic trouble code No.64 is displayed by the self-diagnosis function and hold mode is canceled.
- If a malfunction occurs in the dropping resistor, the line pressure is set at maximum to make driving possible.
- If a malfunction occurs in the line pressure solenoid valve, diagnostic trouble code No.64 is displayed by the self-diagnosis function.


Reduce Torque Signal
- If the wiring is open or shorted, diagnostic trouble code No.57 is displayed by the self-diagnosis function 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 lockup signal, diagnostic trouble code No.57 is displayed by the self-diagnosis function.

Slip Lockup Signal
- If the wiring is open or shorted, diagnostic trouble code No.57 is displayed by the self-diagnosis function and hold mode is canceled.
- If a malfunction occurs in the slip lockup 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 self-diagnosis function.

Inhibitor Signal
- If the wiring is open, the engine speed will be slightly low in P and N ranges.
- If the wiring is shorted, the engine speed will be slightly high in R, D, S, and L ranges

Hold Indicator Light
- If the wiring is open, the hold indicator light will not illuminate.
- If the wiring is shorted, the hold indicator light will remain illuminated.
- If the wiring between the FAT terminal and terminal 2N is open or shorted, diagnostic trouble code(s) will not be displayed by the self-diagnosis function.

pro multis · About Operation CHARM