Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Shift Point Road Test
2010 Mercury Mariner 2WD V6-3.0LSECTION Shift Point Road Test
Shift Point Road Test
This test verifies that the shift control system is operating correctly.
1. Bring engine and transaxle up to normal operating temperature.
2. Operate vehicle with selector lever in D range.
3. NOTE: Shift speed ranges are approximate for all applications.
Apply minimum throttle and observe speeds at which upshift occurs and torque converter engages using the Shift Speeds chart.
Shift Speeds 2.5L
a Do not exceed the speed limit.
Shift Speeds 3.0L
a Do not exceed the speed limit.
4. With vehicle speed above 43 km/h (27 mph), press accelerator pedal to floor, Wide Open Throttle (WOT). The transaxle should shift from 4th to 3rd, or 4th to 2nd, depending on the vehicle speed. The Torque Converter Clutch (TCC) should release.
5. With vehicle speed above 56 km/h (35 mph), move the selector lever from D range to L range and remove foot from accelerator pedal. The transaxle should immediately downshift to 2nd gear. When vehicle speed drops below 32 km/h (20 mph), the transaxle should downshift into 4th gear.
6. If the transaxle fails to upshift/downshift or TCC does not apply and release, refer to Diagnosis By Symptom Diagnosis By Symptom for possible causes.
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.