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Test TC-92A - Low Speed Fan Control Relay Circuit

NOTE: For connector terminal idnetification, see CONNECTOR IDENTIFICATION DIRECTORY  table. For wiring diagram, see WIRING DIAGRAMS article.
  1. Using scan tool, actuate low speed fan relay. If low speed fan relay is clicking, go to next step. If low speed fan relay is not clicking, go to step 4).
  2. Condition to set trouble code is not present at this time. Inspect all related wiring and connectors and repair as necessary. If no problems were found with wiring and connectors, go to next step. If related wiring and connectors were repaired, perform TEST VER-2A .
  3. With actuator test still running, wiggle wiring harness between low speed fan relay and PCM. Low speed fan relay is located in Power Distribution Center (PDC). If wiggling caused an interruption in low speed fan relay clicking, repair wiring harness as necessary where wiggling caused problem to appear. Perform TEST VER-2A . If wiggling did not cause an interruption in low speed fan relay clicking, see INACTIVE TROUBLE CODE CONDITION . Test is complete. Perform TEST VER-2A .
  4. Disconnect low speed fan relay. Low speed fan relay is located in Power Distribution Center (PDC). Using scan tool in voltmeter mode, check voltage on ignition switch output circuit at low speed fan relay connector. See Fig 1. If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair open ignition switch output circuit. Perform TEST VER-2A .
    Fig 1: Low Speed Fan Relay Connector Terminals & Location
    G96J01546
  5. Using an external ohmmeter, check resistance between low speed fan relay terminals. See Figure. If resistance is less than 100 ohms, go to next step. If resistance is 100 ohms or more, replace low speed fan relay. Perform TEST VER-2A .
  6. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Using scan tool in ohmmeter mode, check resistance of low speed fan relay control circuit at low speed fan relay connector. See Fig 1 for terminal identification. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in low speed fan relay control circuit. Perform TEST VER-2A .
  7. Using an external ohmmeter, measure resistance of low speed fan relay control circuit between low speed fan relay connector and PCM connector terminal No. 55. See PCM TERMINAL 55 CONNECTOR WIRE IDENTIFICATION  table. See Fig 1. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2A . If resistance is 5 ohms or more, repair open low speed fan relay control circuit. Perform TEST VER-2A .
PCM TERMINAL 55 CONNECTOR WIRE IDENTIFICATION

Application Wire Color
PCM Terminal No. 55 (Low Speed Fan Relay Control Circuit) White
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