2001 Edition Yamaha F225A and LF225A Outboards Service Manual, Page 239Get this manual
Upper case, steering arm, swivel bracket and clamp brackets 7Fully tilt the outboard motor up, and then support it with the tilt stop lever
WARNING
After tilting up the outboard motor, be sure to support it with the tilt stop leverOtherwise, the outboard motor could suddenly lower if the power trim and tilt unit should lose fluid pressure8Measure the trim sensor resistanceCheck the trim sensor if out of specificationTrim sensor resistance: Pink (P) Black (B) 247.6387.6 at 20 (68 F)