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Test Dr-6A - Testing Idle Speed Motor Position Sensor (Code 15)

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION  . For appropriate wiring diagram, see WIRING DIAGRAMS  at end of article.
  1. Using DRB-II, erase faults. Start engine, and let it idle for more than one minute. Read faults. If Code 15 is displayed again, go to step 3). If Code 15 is not displayed again, read Idle Speed Control (ISC) motor position sensor volts. While monitoring DRB-II display, wiggle ISC motor position sensor wiring.
  2. If ISC motor position sensor voltage value changes, repair wiring harness causing ISC motor position sensor voltage value to change. Perform TEST VER-2. If ISC motor position sensor value does not change, perform TEST DR-14A.
  3. Turn ignition switch to OFF position. Disconnect ISC motor position sensor connector. Turn ignition switch to ON position. Measure voltage at ISC motor position sensor connector terminal No. 6 (Dark Green/Red wire) and ground. If voltage is more than 4 volts, go to step 6). If voltage is less than 4 volts, turn ignition switch to OFF position.
  4. Disconnect Electronic Control Unit (ECU) 24-pin connector. Measure resistance between ECU 24-pin connector terminal No. 23 (Dark Green/Red wire) and ground. If resistance is less than 10 ohms, repair Dark Green/Red wire for a short to ground. Perform TEST VER-2.
  5. If resistance is more than 10 ohms, measure resistance of Dark Green/Red wire between ECU connector terminal No. 13 and ISC motor position sensor connector terminal No. 6. If resistance is more than 10 ohms, repair open Dark Green/Red wire. Perform TEST VER-2. If resistance is less than 10 ohms, replace ECU. Perform TEST VER-2.
  6. Measure voltage between ISC motor position sensor connector terminal No. 5 (Brown wire) and ground. If voltage is less than 4 volts, go to step 8). If voltage is more than 4 volts, measure resistance between ISC motor position sensor connector terminal No. 3 (Dark Green/Black wire) and ground.
  7. If resistance is more than 10 ohms, repair open Dark Green/Black wire between ECU 24-pin connector terminal No. 24 and ISC motor position sensor. Perform TEST VER-2. If resistance is less than 10 ohms, replace ISC motor position sensor. Perform TEST VER-2.
  8. Turn ignition switch to OFF position. Disconnect ECU 24-pin connector. Measure resistance between ECU 24-pin connector terminal No. 17 (Brown wire) and ground.
  9. If resistance is less than 10 ohms, repair Brown wire for a short to ground. Perform TEST VER-2. If resistance is more than 10 ohms, measure resistance of Brown wire between ECU 24-pin connector terminal No. 17 and ISC motor position sensor connector terminal No. 5.
  10. If resistance is more than 10 ohms, repair open Brown wire. Perform TEST VER-2. If resistance is less than 10 ohms, replace ECU. Perform TEST VER-2.
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