Nissan Maxima Service and Repair Manual: Basic inspection
- Diagnosis and repair work flow
- Additional service when replacing TCM
- Additional service when replacing transaxle assembly
Work Flow INTRODUCTION The TCM receives signals from the vehicle speed sensor and transmission range switch. Then it provides shift control or lock-up control via CVT solenoid valves. The TCM also communicates with the ECM by means of signals sent from sensing elements used with the OBD-related parts of the CVT system for malfunction-diagnostic purposes. The TCM is capable of diagnosing malfunctioning parts while the ECM can store malfunctions in its memory. Input and output signals must always be correct and stable in the operation of the CVT system. The CVT system must be in good operating condition and be free of valve seizure, solenoid valve malfunction, etc.
Description When replacing the TCM, perform the following work. TCM PROGRAMMING Since vehicle specifications are not yet written in a new TCM, it is necessary to write them with CONSULT. CAUTION: When replacing TCM, save TCM data on CONSULT before removing TCM. LOADING AND STORING OF CALIBRATION DATA The TCM acquires calibration data (individual characteristic value) of each solenoid that is stored in the ROM assembly (in the control valve). This enables the TCM to perform accurate control. After the TCM is replaced, check that the calibration data is correctly loaded and stored.
Description When replacing the transaxle assembly, perform the following work. ERASING, LOADING AND STORING OF CALIBRATION DATA The TCM acquires calibration data (individual characteristic value) of each solenoid that is stored in the ROM assembly (in the control valve). This enables the TCM to perform accurate control. For this reason, after the transaxle assembly/control valve is replaced, it is necessary to erase the calibration data previously stored in TCM, to load new calibration data, and to stored them. ERASING OF CVT FLUID DEGRADATION LEVEL DATA TCM records the degradation level of the CVT fluid calculated from the vehicle driving status.