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ON-VEHICLE SERVICE TSB Revision ENGINE MECHANICAL 11A-9 CAUTION • The temperature of the surface of the belt should be as close to normal temperature as possible. • Do not allow any contaminants such as water or oil to get onto the microphone. • If strong gusts of wind blow against the microphone or if there are any loud sources of noise nearby, the val- • If the microphone is touching the belt while the mea- surement is being made, the values measured by the • Do not take the measurement while the vehicle's engine is running. (5) Hold special tool MB992080 to the middle of the belt between the pulleys (at the place indicated by arrow) mm (0.4 − 0.59 inch) away from the rear surface of the belt) so that it is perpendicular to the belt (within an angle (6) Press the "MEASURE" button. place indicated by the arrow) with your finger as shown in Standard value: 98 − 124 Hz NOTE: To take the measurement repeatedly, tap the belt (8) Press and hold the "POWER" button to turn off the power supply. 3. If not within the standard value, replace the auto-tensioner. ). . AC607321 AD MB992080 15˚ Gently tap with your finger 15˚ 10 – 15 mm Generator Idler pulley Idler pulley Crankshaft Power steering |