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AUTOMATIC TRANSAXLE DIAGNOSIS TSB Revision AUTOMATIC TRANSAXLE 23A-95 Judgement Criteria • Output speed: no signal change. (4 seconds) • If DTC 23 (P0720) is set consecutively four times, the transaxle is locked into 3rd gear or 2nd gear Check Conditions • Transmission range switch position: D, 3, 2 or L. • Input speed: 500 r/min or more. • Transmission fluid temperature sensor voltage: 4.5 volts or less. • Rapid output speed change: -31.9 r/min / 0.016 second or less. Judgement Criteria • Output speed: [(input speed - 200 r/min) / gear ratio] or less. (4 seconds) • If DTC 23 (P0720) is set consecutively four times, the transaxle is locked into 3rd gear or 2nd gear . OBD-II DRIVE CYCLE PATTERN . TROUBLESHOOTING HINTS (The most likely • Malfunction of the output shaft speed sensor • Malfunction of the transfer drive gear or driven gear • Damaged harness or connector • Malfunction of the PCM DIAGNOSIS Required Special Tool: • MB991958: Scan Tool (MUT-III Sub Assembly) • MB991824: V.C.I. • MB991827: MUT-III USB Cable • MB991910: MUT-III Main Harness A STEP 1. Using scan tool MB991958, check data list item 23: CAUTION To prevent damage to scan tool MB991958, always turn the (3) Set scan tool MB991958 to the data reading mode. • Item 23: Output Shaft Speed Sensor. • When driving at a constant speed of 50km/h (31mph), the display should be "1,400 − 1,700 r/min" (Gear range: 3rd gear). (4) Turn the ignition switch to the "LOCK" (OFF) position. YES : It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use − How to Cope with Intermittent Malfunction . NO : Go to Step 2. AC305412 AB MB991910 DATA LINK CONNECTOR MB991824 MB991827 |