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Test TC-139A - High Speed Radiator Fan Control Relay

NOTE: For connector terminal ID, see CONNECTOR IDENTIFICATION  Directory. For wiring diagram, see WIRING DIAGRAMS article.
  1. Using scan tool, actuate high speed radiator fan relay. If high speed radiator fan relay is clicking, go to next step. If high speed radiator fan relay is not clicking, go to step 5).
  2. Condition to set trouble code is not present at this time. HIGH SPEED RADIATOR FAN CONTROL RELAY CIRCUIT DTC sets if an open or shorted condition is detected in high speed radiator fan relay control circuit. Possible causes are:
    • Relay coil open or shorted
    • Fused ignition switch output circuit open
    • Open or shorted relay control circuit
    • Inoperative circuit driver in PCM.
  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. Wiggle wiring harness between high speed radiator fan relay and PCM while scan tool is still actuating high speed radiator fan relay. If wiggling did not cause an interruption of high speed radiator fan relay actuation, see INACTIVE TROUBLE CODE CONDITION . Test is complete. Perform TEST VER-2A. If wiggling caused an interruption of high speed radiator fan relay actuation, repair wiring harness as necessary where wiggling caused problem to appear. Perform TEST VER-2A.
  5. Disconnect high speed radiator fan relay. Using scan tool in voltmeter mode, check voltage of high speed radiator fan relay connector ignition switch output circuit. See 47. 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.
  6. Using an external ohmmeter, check resistance between high speed radiator 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 radiator fan relay. Perform TEST VER-2A.
    Fig 1: High Speed Radiator Fan Control Relay Terminals & Location
    G96J01565
  7. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Using scan tool in ohmmeter mode, check resistance of high speed radiator fan relay control circuit at relay connector. See 47 for terminal identification. If resistance 5 ohms or more, go to next step. If resistance less than 5 ohms, repair short to ground in high speed radiator fan relay control circuit. Perform TEST VER-2A.
  8. Using an external ohmmeter, measure resistance of high speed radiator fan relay control circuit between high speed radiator fan relay connector and PCM connector terminal No. 69 (Green/Orange wire). See Fig 1 for wire identification. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2A. If resistance is 5 ohms or more, repair open high speed radiator fan relay control circuit. Perform TEST VER-2A.
PCM TERMINAL 69 CONNECTOR WIRE IDENTIFICATION

Application Wire Color
PCM Terminal No. 69 (High Speed Radiator Fan Relay Control Circuit) Green/Orange
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