Test Dr-9A - Testing Vehicle Speed Sensor (Code 24)
NOTE:
For connector terminal identification, see CONNECTOR IDENTIFICATION
. For appropriate wiring diagram, see WIRING DIAGRAMS
at end of article.
- Ensure speedometer drive and cable are operational. Disconnect DRB-II adapter from diagnostic connector. Turn ignition switch to ON position. Connect an analog voltmeter to diagnostic connector terminal No. 11. See Fig 1 . While watching voltmeter, rotate both front wheels simultaneously.
- If voltage pulsates while wheels are rotated, replace Electronic Control Unit (ECU). Perform TEST VER-2. If voltage does not pulsate while wheels are rotated, turn ignition switch to OFF position. Disconnect instrument cluster connectors. Turn ignition switch to ON position.
- Measure voltage at instrument cluster connector terminal No. 59 (Yellow/White wire). See Fig 2 . If voltage is less than 4 volts, go to next step. If voltage is more than 4 volts, measure resistance between instrument cluster connector terminal No. 2 and ground. If resistance is more than 10 ohms, repair Black wire for an open circuit to ground. Perform TEST VER-2. If resistance is less than 10 ohms, replace speed sensor. Perform TEST VER-2.
- Turn ignition switch to OFF position. Disconnect ECU 24-pin connector. Measure resistance between ECU 24-pin connector terminal No. 18 (Yellow/White wire) and ground. If resistance is less than 10 ohms, repair Yellow/White wire for a short to ground. Perform TEST VER-2.
- If resistance is more than 10 ohms, measure resistance of Yellow/White wire between ECU 24-pin connector terminal No. 18 and instrument cluster connector terminal No. 59. If resistance is less than 10 ohms, replace ECU. Perform TEST VER-2. If resistance is more than 10 ohms, repair open Yellow/White wire. Perform TEST VER-2.