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Content .. 1899 1900 1901 1902 ..
Theory of Operation The Input Speed Sensors 1 and 2 (N2 - N3) will report the same speed in 2nd, 3rd and 4th gears. If the Input • When Monitored: • Set Condition: Possible Causes INTERNAL TRANSMISSION TRANSMISSION CONTROL MODULE Always perform the NAG1 Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - Diagnostic Test 1. CHECK FOR SPEED SENSOR OR SENSOR SUPPLY VOLTAGE DTCS With the scan tool, check for other transmission DTCs. Are any Input Speed Sensor and/or Sensor Supply Voltage DTCs present? Yes >> Refer to the Transmission category and perform the appropriate symptom(s). (Refer to 21 - TRANS- MISSION/TRANSAXLE/AUTOMATIC - NAG1 - DIAGNOSIS AND TESTING) No >> Go To 2 2. CHECK TO SEE IF INPUT SENSOR MISMATCH IS CURRENT NOTE: If the TCM detects and stores a DTC, the TCM also stores the vehicles operating conditions under Using the Environmental Data recorded earlier, test drive the vehicle while trying to duplicate the conditions in which Did the DTC P2784-INPUT SPEED SENSOR 1/2 CORRELATION reset? Yes >> Go To 3 No >> Go To 4 3. INTERNAL TRANSMISSION Turn the ignition off to the lock position. Remove the Transmission Oil Pan and inspect for debris, a plugged Transmission Oil Filter, or any sign of an inter- Is there any debris, plugged Transmission Oil Filter, or any sign of an internal transmission problem? Yes >> Repair as necessary. Refer to 21- AUTOMATIC TRANSMISSION-AUTOMATIC TRANSMISSION NAG1/ SERVICE INFORMATION for the appropriate service procedures. Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1. (Refer to 21 - TRANSMISSION/ No >> Using the schematics as a guide, check the Transmission Control Module (TCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems 21 - 138 AUTOMATIC TRANSMISSION NAG1 - ELECTRICAL DIAGNOSTICS LX |