Tire / Axle Ratio Out of Acceptable Range
Table of contents
P1635 MERCURY Possible Causes
- Incorrect tire size
- Incorrect axle ratio
- Incorrect Vehicle ID block configuration parameters
How do I fix code P1635 MERCURY?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Tech Notes
- After a new Powertrain Control Module (PCM) has been installed, the Vehicle Identification (VID) block has to be programmed to the PCM.
- There is a Factory Service Bulletin for the 2002 Mercury Mountaineer:
- 2002 Mercury Mountaineer Factory Service Bulletin OBDII Code P1635
Cost of diagnosing the P1635 MERCURY code
The cost of diagnosing the P1635 MERCURY code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P1635 MERCURY Description
The All-Wheel Drive (AWD) system continuously monitors vehicle conditions and automatically adjusts the torque distribution between the front and rear wheels. During normal operation, most of the torque is sent to the front wheels. If wheel slip between the front and rear wheels is detected or the vehicle is under heavy acceleration, the AWD system increases torque to the rear wheels. When the 4X4 control module detects inappropriate mini spare or road wheels/tires (greater than 7% across the front and rear axle or 14% at one wheel) installed, this Diagnostic Trouble Code (DTC) is set.