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AUTOMATIC TRANSMISSION DIAGNOSIS TSB Revision AUTOMATIC TRANSMISSION 23A-45 DTC SET CONDITIONS Check Conditions • Engine speed: 1,000 r/min or more. • Output speed: 1,000 r/min or more. • Accumulated time in above condition: 10 min- utes. Judgement Criteria • Transmission fluid temperature sensor voltage: 4.5 volts or more. (1 second) . OBD-II DRIVE CYCLE PATTERN . TROUBLESHOOTING HINTS (The most likely • Malfunction of the transmission fluid temperature sensor circuit • Damaged harness, 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 • MB991911: MUT-III Main Harness B STEP 1. Using scan tool MB991958, check data list item 15: CAUTION To prevent damage to scan tool MB991958, always turn the • Item 15: Transmission Fluid Temperature Sensor. • When the engine is cool: Almost equal to the ambi- ent temperature (atmospheric temperature). • When the engine is warm: 70 to 80°C (158 to 176°F) (4) Turn the ignition switch to "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. AK303629AB MB991911 MB991827 MB991824 16-PIN |