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post #1 of Old 07-16-2018, 04:21 AM Thread Starter
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Android App - CVTz50 – CVT diagnostics with ELM327

While I was searching CVT maintenance for my 2007 Versa, I came across this Android App called CVTz50 (US$4.99) which can monitor my Versa CVT diagnostic parameters provided by the Nissan diagnostic tool Consult-II.

§ Engine speed, RPM (corresponding Consult-II parameter: ENG SPEED)
§ Gear lever position or manual gear number in manual mode (in brackets when brake pedal depressed)
§ Vehicle speed, KM/H (corresponding Consult-II parameter: VEHICLE SPEED). Some vehicles may report here values less than real vehicle speed. For such cases, it is possible to manually select speed source: CVT speed sensor, ABS speed sensor, or speed recognized by engine control system. Speed source selection menu can be opened by long click on speed value in monitor mode.
§ Accel – accelerator position, values in range from 0.0 to 8.0 (corresponding Consult-II parameter: ACC PEDAL OPEN)
§ Engine horsepower (value calculated basing on engine speed and load), hp
§ Engine torque (value calculated by control module basing on engine speed and load), N·m (corresponding Consult-II parameter: VENG TRQ)
§ AWD %:% F:R – AWD solenoid control current and corresponding torque distribution between Front and Rear axis from 100%:0% to 50%:50% (only for Nissan-based vehicles) (corresponding Consult-II parameter: ETS SOLENOID)
§ Vehicle acceleration, g (corresponding Consult-II parameter: G SPEED)
§ Instant fuel consumption in liters per 100km and in liters per hour; fuel level sensor, distance to empty calculated by CVTz50, average fuel consumption, fuel consumed, total travel distance and travel time (to reset these values calculated by CVTz50, press and hold any of these numbers)
§ Engine – engine coolant temperature and color indicator of temperature range (<20°C COLD; 20-80°C WARM; 80-100°C OK; 100-120°C HOT; >120°C HOTTER) (corresponding Consult-II parameter: COOLAN TEMP/S)
§ Intake – intake air temperature (measured at mass airflow sensor) (corresponding Consult-II parameter: INT/A TEMP SE)
§ CVT Temp/Count – CVT fluid temperature in 2 different units: Celsius degrees and in “Counts” displayed by other diagnostic tools; and color indicator of temperature range (<20°C COLD; 20-50°C WARM; 50-90°C OK; 90-110°C HOT; >110°C HOTTER) (corresponding Consult-II parameter: ATF TEMP COUNT)
§ Clutch Lockup – torque converter lockup current; and color indicator showing up when torque converter is in locked up state (corresponding Consult-II parameter: ISOLT1)
§ Slip Rev – RPM slippage inside torque converter (shall be around 0 when torque converter is locked up) (corresponding Consult-II parameter: SLIP REV)
§ Trq Ratio – torque ratio of torque converter (corresponding Consult-II parameter: TRQ RTO)
§ Virt. Gear – approximate number of virtual gear which corresponds to current gear ratio
§ Gear Ratio – CVT gear ratio, target and actual (corresponding Consult-II parameter: DGEAR RATIO / GEAR RATIO); for transmissions with auxiliary gear (like CVT7) additional indicator ▲ shows that auxiliary gear switched from low-gear mode to high-gear mode
§ STM Step – Step Motor position, target and actual (corresponding Consult-II parameter: DSTM STEP / STM STEP), only for transmissions equipped with Step Motor (Jatco CVT prior to CVT7)
§ Approximate final torque after considering all gear ratios (based on engine RPM, load, current gear ratios, only for Nissan Murano)
§ SEC PRS Target – target CVT fluid pressure in secondary pulley, MPa (corresponding Consult-II parameter: TGT SEC PRESS)
§ SEC Pressure – actual CVT fluid pressure in secondary pulley, MPa (corresponding Consult-II parameter: SEC PRESS)
§ sec max – maximum CVT fluid pressure in secondary pulley observed during current CVTz50 session, MPa
§ PRI Pressure – actual CVT fluid pressure in primary pulley, MPa (corresponding Consult-II parameter: PRI PRESS)
§ pri max – maximum CVT fluid pressure in primary pulley observed during current CVTz50 session, MPa
§ Line PRS Tgt – target LINE pressure, MPa (corresponding Consult-II parameter: LINE PRS)
§ LU – target torque converter lockup pressure, MPa (corresponding Consult-II parameter: LU PRS)
§ Deterior. – CVT Fluid Deterioration, value in brackets shows deterioration increase during current CVTz50 session (corresponding Consult-II parameter: CVTF DETERIORATION DATE)
§ Battery – TCM (transmission control module) power supply voltage (corresponding Consult-II parameter: VIGN SEN) and voltage on OBD2 socket, V
§ Timestamp of last monitoring data update. In case if DTC appear in engine control or CVT control, then timestamp will be replaced with DTC indicator – yellow in case of engine DTC and red in case of CVT DTC.

I am interested in the CVT Fluid Deterioration counter since my last CVT fluid change. Nissan recommends to change CVT fluid if deterioration exceeded 210000 points. (Note that deterioration counter takes into account CVT operation time only in high temperature conditions. There might be other reasons to replace CVT fluid – they shall be considered even if deterioration counter significantly below the threshold).

My 2007 Versa is 11 years old. I am currently doing all repairs and maintenance on my Versa. Nissan dealer shop drain and filled the CVT fluid about 1 years ago - about 22,000 km ago. With this tool, I can reset the CVT Fluid Deterioration counter after my next CVT fluid change by myself.

For details - CVTz50 – CVT (Continuously Variable Transmission) diagnostics for Android with ELM327

Anyone is using this Android App with ELM327 ODB2 scanner. I like to hear your review.

Last edited by TechGuy8; 07-16-2018 at 05:28 AM.
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