TCM · Jatco JR711E
Transmission diagnostics for the Infiniti QX80, QX56 and Nissan Patrol Y62
The 7-speed Jatco JR711E is tough but expensive to repair, and trouble starts quietly: fluid temperature creeps up, the torque converter stops locking up fully. Canfiti shows 86 live parameters from the transmission unit — essentially the same Data Monitor the dealer sees in CONSULT.
What the “Transmission” screen shows
Parameters are split into 10 groups. Data refreshes continuously while the screen is open; temperature and speed use the units from settings.
- 8Gears and selector
- 4Fluid temperature
- 8Speeds and revolutions
- 18Solenoids: command and monitor
- 8Target pressures
- 6Torque and load
- 23Switches and inputs
- 4Signals from other systems
- 3Engaged components
- 4Indicators and status
Six readings worth watching
Fluid temperature
In the pan and at the torque converter outlet. A common guideline for most automatics is 170–225 °F (77–107 °C); factory limits for this transmission are not public.
Gear ratio
In gear and outside a shift, the actual ratio must match the target and stay steady. If it wanders, a clutch is slipping.
Torque converter slip
In 6th and 7th at a steady speed it is close to zero. If it does not drop while TCC pressure is high, the lock-up is wearing.
Solenoids: command and monitor
The current the unit commands and the current it measures are very close in a healthy transmission.
Fail-safe and overheating
The fail-safe indicator and the ATF warning lamp are always 0 when everything is fine.
Selector position
The letter on screen must match the lever, and the range switches must not flicker.
Which vehicles
Second-generation Infiniti QX56 (Z62, 2011–2013 model years), Infiniti QX80 through 2024, Nissan Patrol Y62 and Nissan Armada 2017–2024 — all share the Jatco JR711E (RE7R01B). It does not apply to the first-generation QX56 (JA60, 5-speed) or the new 2025+ QX80 (9-speed).
Engine won’t crank?
The transmission unit gives permission to start: in P and N it feeds the starter relay. “Start relay monitor” shows what the unit actually outputs. Turn the ignition on without cranking and watch it together with the selector position to tell whether the transmission is to blame.
Verified on these vehicles
The transmission Data Monitor is verified on the Infiniti QX56 and QX80 (Z62); the Nissan Patrol and Armada Y62 use the same transmission.
It also works on many other Nissan and Infiniti vehicles with a CAN bus — connect and check. If it works, tell us and we will add your model to the list.