2013 — 2021
3.0L I4 (4JJ1-TCX)
Diesel
Full lock turns at low speed on a sealed surface. | Description: Listen for clicking or popping from front CV joints and check for torn boots; early models are known for front-end component wear if used heavily off-road.
Hard acceleration from 40km/h to 100km/h. | Description: Watch for excessive black smoke or 'limp mode' triggers. While the 4JJ1 is robust, carbon buildup in the EGR system can cause flat spots and surging.
Apply moderate braking pressure at highway speeds. | Description: Check for steering wheel wobble or pedal pulsation. M-UX rotors are prone to warping, especially if the vehicle has been used for heavy towing.
Cycle through 2H, 4H, and 4L on a soft surface. | Description: Ensure the electronic actuator engages promptly. Delayed engagement or flashing lights often indicate vacuum line leaks or actuator motor failure.
Standard intermediate service including engine oil, oil filter, and a comprehensive safety inspection of the braking system.
Major service interval: Replace primary and secondary fuel filters, replace air filter, and change fluids in the front/rear differentials and transfer case.
Critical milestone: Inspection of the timing chain tensioner, valve clearance adjustment (often overlooked), and a full cooling system flush and coolant replacement.
Diesel Particulate Filter (DPF) burn-off status and sensor health check.
EGR valve and intake manifold inspection for carbon soot accumulation.
Automatic transmission fluid (ATF) condition check and flush (especially if towing).
Greasing of the propeller shaft universal joints and slip joints.
Battery health check, as the 4JJ1 requires high cold-cranking amps for reliable starting.
Estimated repair costs if issues arise
High cost if the filter is internally cracked or bypasses regenerations frequently.
Genuine Denso injectors are required for the common rail system to maintain fuel economy and prevent piston melt.
Replacement of the variable geometry turbocharger if oil seals fail or vanes seize.
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Disclaimer: This report is generated with the assistance of AI analysis based on verified automotive data. While we strive for 100% accuracy, enthusiasts should always conduct physical inspections and consult service records. View Full Disclaimer