OPERATION PROCEDURE
- Connect both battery cables. NOTE: Supply power using jumper cables if battery is discharged.
- Use the Intelligent Key or mechanical key to turn the ignition switch to the "ACC" position. At this time, the steering lock will be released.
- Disconnect both battery cables. The steering lock will remain released and the steering wheel can be rotated.
- Perform the necessary repair operation.
- When the repair work is completed, return the ignition switch to the "LOCK" position before connecting the battery cables. (At this time, the steering lock mechanism will engage.)
- Perform a self-diagnosis check of all control units using CONSULT-II.
SYSTEM DESCRIPTION
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Many electronic control units are equipped onto a vehicle, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with 2 communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring. Each control unit transmits/receives data but selectively reads required data only. For details, Refer to CAN COMMUNICATION UNIT .
Scheme 1
Scheme 2
- When an input torque signal equivalent to the engine drive force is sent from the ECM to the TCM, the TCM controls the line pressure solenoid valve and secondary pressure solenoid valve.
- This line pressure solenoid controls the pressure regulator valve as the signal pressure and adjusts the pressure of the operating oil discharged from the oil pump to the line pressure most appropriate to the driving state. Secondary pressure is controlled by decreasing line pressure.
DESCRIPTION
- The purpose of the test is to determine overall performance of CVT and analyze causes of problems.
- The road test consists of the following three parts
Scheme 3
- «Check Before Engine Is Started»(ref-234000-S17662428872006052800000) .
- «Check at Idle»(ref-234000-S04573332932006052800000) .
- «Cruise Test»(ref-234000-S27597162532006052800000) .
Scheme 4
- Before road test, familiarize yourself with all test procedures and items to check.
- Perform tests on all items until specified symptom is found. Troubleshoot items which check out No Good after road test. Refer to «ON BOARD DIAGNOSTIC (OBD) SYSTEM»(ref-234000-S30686238302006052800000) .
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle multiplex communication line with high data communication speed and excellent malfunction detection ability. Many electronic control units are equipped onto a vehicle, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with 2 communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring. Each control unit transmits/receives data but selectively reads required data only.
- TCM controls starter relay in IPDM E/R.
- TCM switches starter relay ON at "P" or "N" position and allows to crank engine.
- Then it prohibits cranking other than at "P" or "N" position.
Scheme 5
ON, OFF status of the stop lamp switch is sent via the CAN communication from the unified meter and A/C amp to TCM using the signal.
Scheme 6
- The park/neutral position (PNP) switch includes 4 transmission position switches.
- TCM judges the selector lever position by the PNP switch signal. PARK/NEUTRAL POSITION SWITCH CHART Shift position PNP switch 1 PNP switch 2 PNP switch 3 PNP switch 4 PNP switch 3 (monitor) P OFF OFF OFF OFF OFF R ON OFF OFF ON OFF N ON ON OFF OFF OFF D.S (1) ON ON ON ON ON L (1) OFF ON ON OFF ON (1) Without manual mode
Scheme 7
The CVT fluid temperature sensor detects the CVT fluid temperature and sends a signal to the TCM.
Scheme 8
The input speed sensor (primary speed sensor) detects the primary pulley revolution speed and sends a signal to the TCM.
The vehicle speed sensor CVT [output speed sensor (secondary speed sensor)] detects the revolution of the CVT output shaft and emits a pulse signal. The pulse signal is sent to the TCM, which converts it into vehicle speed.
The engine speed signal is sent from the ECM to the TCM.
TCM selects the gear ratio using the engine load (throttle position), the primary pulley revolution speed, and the secondary pulley revolution speed as input signal. Then it changes the operating pressure of the primary pulley and the secondary pulley and changes the groove width of the pulley.
- The torque converter clutch solenoid valve is activated by the TCM in response to signals sent from the vehicle speed and throttle position sensors. Lock-up piston operation will then be controlled.
- Lock-up operation, however, is prohibited when CVT fluid temperature is too low.
- When the accelerator pedal is depressed (less than 2/8) in lock-up condition, the engine speed should not change abruptly. If there is a big jump in engine speed, there is no lock-up.
This malfunction is detected when the torque converter clutch does not lock-up as instructed by the TCM. This is not only caused by electrical malfunction (circuits open or shorted), but also by mechanical malfunction such as control valve sticking, improper solenoid valve operation, etc.
The pressure control solenoid valve A (line pressure solenoid valve) regulates the oil pump discharge pressure to suit the driving condition in response to a signal sent from the TCM.
The pressure control solenoid valve A (line pressure solenoid valve) regulates the oil pump discharge pressure to suit the driving condition in response to a signal sent from the TCM.
The pressure control solenoid valve B (secondary pressure solenoid valve) regulates the secondary pressure to suit the driving condition in response to a signal sent from the TCM.
The pressure control solenoid valve B (secondary pressure solenoid valve) regulates the oil pump discharge pressure to suit the driving condition in response to a signal sent from the TCM.
The secondary pressure duty cycle value is not consistent when the closed throttle position signal is "ON". To confirm the secondary pressure duty cycle at low-pressure, the accelerator (throttle) should be open until the closed throttle position signal is "OFF".
Manual mode switch is installed in CVT control device. The manual mode switch sends shift up and shift down switch signals to TCM.
TCM sends the switch signals to unified meter and A/C amp via CAN communication line. Then manual mode switch position is indicated on the CVT position indicator. For inspection, Refer to DIAGNOSTIC PROCEDURE .
Scheme 9
The transmission fluid pressure sensor A (secondary pressure sensor) detects secondary pressure of CVT and sends TCM the signal.
Using the engine load (throttle position), the primary pulley revolution speed, and the secondary pulley revolution speed as input signal, TCM changes the operating pressure of the primary pulley and the secondary pulley and changes the groove width of the pulley to control the gear ratio.
The primary pressure sensor detects primary pressure of CVT and sends TCM the signal.
The pressure control solenoid valve B (secondary pressure solenoid valve) regulates the secondary pressure to suit the driving condition in response to a signal sent from the TCM.
The secondary pressure duty cycle value is not consistent when the closed throttle position signal is "ON". To confirm the secondary pressure duty cycle at low-pressure, the accelerator (throttle) should be open until the closed throttle position signal is "OFF".
When the power supply to the TCM is cut OFF, for example because the battery is removed, and the self-diagnosis memory function stops, malfunction is detected.
Note. Since "P1701 TCM-POWER SUPPLY" will be indicated when replacing TCM, perform diagnosis after erasing "SELF-DIAG RESULTS"
Electric throttle control actuator consists of throttle control motor, accelerator pedal position sensor, throttle position sensor etc. The actuator sends a signal to the ECM, and ECM sends the signal to TCM with CAN communication.
The vehicle speed signal is transmitted from ABS actuator and electric unit (control unit) to TCM by CAN communication line.
The vehicle speed sensor CVT [output speed sensor (secondary speed sensor)] detects the revolution of the idler gear parking pawl lock gear and generates a pulse signal. The pulse signal is sent to the TCM, which converts it into vehicle speed.
The input speed sensor (primary speed sensor) detects the primary pulley revolution speed and sends a signal to the TCM.
Electric throttle control actuator consists of throttle control motor, accelerator pedal position sensor, throttle position sensor etc. The actuator sends a signal to the ECM, and ECM sends the signal to TCM with CAN communication.
- Lock-up select solenoid valve controls lock-up clutch pressure or forward clutch pressure (reverse brake pressure).
- When controlling lock-up clutch, the valve is turned OFF. When controlling forward clutch, it is turned ON.
Scheme 10
The pressure control solenoid valve A (line pressure solenoid valve) regulates the oil pump discharge pressure to suit the driving condition in response to a signal sent from the TCM.
- The step motor changes the step with turning 4 coils ON/OFF according to the signal from TCM. As a result, the flow of line pressure to primary pulley is changed and pulley ratio is controlled.
- The step motor's 4 aspects of ON/OFF change according to the signal from TCM. As a result, the flow of line pressure to primary pulley is changed and pulley ratio is controlled.
- This diagnosis item is detected when electrical system is OK, but mechanical system is NG.
- This diagnosis item is detected when the state of the changing the speed mechanism in unit does not operate normally.
Second position switch is built into CVT control device.
When selector lever is in "S" or "L" position, second position switch turns ON and sends a signal to unified meter and A/C amp.
Then signal is transferred to TCM with CAN communications to improve engine brake performance.
TCM sends the switch signals to unified meter and A/C amp via CAN communication line. Then manual mode switch position is indicated on the CVT indicator.
- The electrical key interlock mechanism also operates as a shift lock: With the ignition switch turned to ON, the selector lever cannot be shifted from "P" (parking) to any other position unless the brake pedal is depressed. With the key removed, the selector lever cannot be shifted from "P" to any other position. The key cannot be removed unless the selector lever is placed in "P".
- The shift lock and key interlock mechanisms are controlled by the ON-OFF operation of the shift lock solenoid and by the operation of the rotator and slider located inside the key cylinder, respectively.
Scheme 11
Note. This emergency lever can be used when battery is off ignition key cannot be removed. In the situation like this, by operating this lever, ignition key can be removed.
