Accurate Trim Test

Accurate trim test should be used when attempting to measure ride height or before attempting a wheel alignment operation. This test commands vehicle dynamics module to adjust air suspension so that each corner of vehicle is within 0-.16" (0-4 mm) of design riding height as defined by current height sensor adjustment and ride height calibration. No trouble codes are displayed unless fault is present during accurate trim operation. When nominal riding height is reached, New Generation Star (NGS) tester will display SYSTEM PASSED. Riding height should now be measured or alignment procedure performed.