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4JA1-TC/4JH1-TC ENGINE DRIVEABILITY AND EMISSIONS 6E–199 7 Check for poor/faulty connection at the ECM and other — Verify repair Go to Step 9 8 Remove the VSS from the housing case and visually — Go to Step 10 Go to Step 9 9 Using the DVM and check the VSS signal. 1. Ignition “On”, vehicle “Run (lift up)”. 2. Measure the VSS output voltage at sensor, meter and ECM. Does the tester indicate specified value? If a oscilloscope is available, monitor the VSS signal at Refer to Diagnostic Aids and Go to Step 16 Refer the table 10 Replace the VSS. — Verify repair Step Action Value(s) Yes No 68 C-56 Measurement Position Voltage (V) (AC Range) If No Good VSS terminal 3 & GND Approximately 6.5 V at 20km/h Go to Step 10 Meter B23 connector 9 & Go to Step 11 Meter B23 connector 8 & Go to Step 13 ECM C56 connector 68 & Go to Step 14 Vehicle Speed Sensor Reference Wave Form 0V → Measurement Scale: 10V/div 50ms/div Measurement Condition: Vehicle Speed 20km/h |