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Test TC-93A - High 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 high speed fan relay. If high speed fan relay is clicking, go to next step. If high speed fan relay is not clicking, go to step 5).
  2. Condition to set trouble code is not present at this time. HIGH SPEED FAN CONTROL RELAY CIRCUIT DTC sets if an open or shorted condition is detected in high speed fan relay circuit. Possible causes are: high speed fan relay coil open or shorted, fused ignition switch output circuit open, high speed fan relay control circuit open or shorted or inoperative circuit driver in Powertrain Control Module (PCM). Go to next step.
  3. 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 .
  4. With actuator test still running, wiggle wiring harness between high speed fan relay and PCM. High speed fan relay is located in Power Distribution Center (PDC). If wiggling caused an interruption in high 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 high speed fan relay clicking, see INACTIVE TROUBLE CODE CONDITION . Test is complete. Perform TEST VER-2A .
  5. Disconnect high speed fan relay. High speed fan relay is located in Power Distribution Center (PDC). Using scan tool in voltmeter mode, check voltage on ignition switch output circuit at high 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: High Speed Fan Relay Connector Terminals & Location
    G96F01554
  6. Using an external ohmmeter, check resistance between high 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 high speed fan relay. Perform TEST VER-2A .
  7. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Using scan tool in ohmmeter mode, check resistance of high speed fan relay control circuit at high speed fan relay connector. See Fig 1. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in high speed fan relay control circuit. Perform TEST VER-2A .
  8. Using an external ohmmeter, measure resistance of high speed fan relay control circuit between high speed fan relay connector and PCM connector terminal No. 69. See PCM TERMINAL 69 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 high speed fan relay control circuit. Perform TEST VER-2A .
PCM TERMINAL 69 CONNECTOR WIRE IDENTIFICATION

Application Wire Color
PCM Terminal No. 69 (High Speed Fan Relay Control Circuit) Dark Blue/Pink
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