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Test 2B: Modulator Circuits

NOTE: For connector terminal ID, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAM .
  1. Inspect Hydraulic Control Unit (HCU) 6-pin connector. If connection is loose, repair as necessary. Perform TEST VER-1A . If connection is okay, go to next step.
  2. Turn ignition off. Disconnect and inspect HCU 6-pin connector. If connector is damaged, repair as necessary. Perform TEST VER-1A . If connector is okay, go to next step.
  3. Using scan tool in ohmmeter mode, check resistance between ground and HCU 6-pin connector terminals No. 5 (Black wire) and No. 6 (Black wire). If resistance is 5 ohms or more, repair open in appropriate Black wire. Perform TEST VER-1A . If resistance is less than 5 ohms, go to next step.
  4. Turn ignition on. Using scan tool, actuate left front decay solenoid. Using scan tool in voltmeter mode, check voltage on HCU 6-pin connector terminal No. 3 (Brown/Yellow wire). If voltage does not switch between zero and 10 or more volts, go to TEST 2C . If voltage switches between zero and 10 or more volts, go to next step.
  5. Using scan tool, actuate right front decay solenoid. Using scan tool in voltmeter mode, check voltage on HCU 6-pin connector terminal No. 2 (Dark Green/Yellow wire). If voltage does not switch between zero and 10 or more volts, go to TEST 2D . If voltage switches between zero and 10 or more volts, go to next step.
  6. Using scan tool, actuate left rear decay solenoid. Using scan tool in voltmeter mode, check voltage on HCU 6-pin connector terminal No. 1 (Brown/Light Blue wire). If voltage does not switch between zero and 10 or more volts, go to TEST 2E . If voltage switches between zero and 10 or more volts, go to next step.
  7. Using scan tool, actuate right rear decay solenoid. Using scan tool in voltmeter mode, check voltage on HCU 6-pin connector terminal No. 4 (Dark Green/Light Blue wire). If voltage does not switch between zero and 10 or more volts, go to TEST 2F . If voltage switches between zero and 10 or more volts, go to next step.
  8. Stop actuator test. Reconnect HCU 6-pin connector. Turn ignition off. Disconnect Controller Anti-Lock Brake (CAB) 60-pin connector. Inspect, clean and repair connector as necessary. Perform TEST VER-1A . If connector is okay, go to next step.
  9. Using an external ohmmeter, check resistance between ground and CAB connector terminals No. 42 (Brown/Yellow wire), No. 43 (Dark Green/Yellow wire), No. 46 (Brown/Light Blue) and No. 48 (Dark Green/Light Blue wire). If all resistance readings are 2-9 ohms, go to TEST 20A . If all resistance readings are not 2-9 ohms, replace HCU. Perform TEST VER-1A .
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