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DIAGNOSTIC TROUBLE CODE PROCEDURES <AUTOMATIC TRANSMISSION> TSB Revision DIAGNOSTIC TROUBLE CODE PROCEDURES 23Ac-143 STEP 3. Using an oscilloscope, check the vehicle speed (2) Connect an oscilloscope probe to PCM connector D-134 terminal 79 by backprobing. (3) Start the engine. (4) Check the vehicle speed sensor waveform. • The vehicle speed sensor waveform should show a pat- tern similar to the illustration when running the vehicle. (5) Turn the ignition switch to the "LOCK" (OFF) position. YES : Go to Step 6. AC204681AC CONNECTOR: D-134 D-134 (GR) 61 62 63 64 65 66 67 68 69 70 71 72 73 82 89 81 88 80 79 78 77 87 86 85 76 75 74 84 83 AC204946 AG OSCILLO- PROBE D-134 HARNESS CONNECTOR : 76 85 65 72 71 73 82 75 81 74 63 64 66 70 69 68 67 78 87 79 88 89 80 77 86 62 61 83 84 ACX02131 NORMAL WAVEFORM (V) AC |