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Test FC-36A - A/C Pressure Sensor Low (DTC 33)

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION . For appropriate wiring diagram, see WIRING DIAGRAMS  at end of article.
  1. Using DRB-II, read A/C pressure sensor voltage. If A/C pressure sensor voltage is less than 0.2 volt, go to step 5). If A/C pressure sensor voltage is more than 0.2 volt, go to next step.
  2. Wiggle A/C pressure sensor connector and harness while watching DRB-II. If a change in A/C pressure sensor voltage is observed, repair connector or harness that caused voltage to change. Perform TEST VER-2. If a change in A/C pressure sensor voltage is not observed, go to next step.
  3. At this time, the condition required to set fault is not present. A/C PRESSURE SENSOR LOW fault sets if A/C pressure sensor signal voltage is less than 0.2 volt or if voltage is less than 0.7 volt for 22 seconds when A/C relay is energized. Possible causes are: sensor signal wire shorted to ground or sensor shorted to ground internally.
  4. Inspect wiring and connectors. Repair as required. Perform TEST VER-2. If wiring and connectors are okay, see INACTIVE FAULT CONDITION . Perform TEST VER-2.
  5. If A/C pressure sensor voltage was less than 0.2 volt in step 1), disconnect A/C pressure sensor connector. Place DRB-II in voltmeter mode. Using DRB-II, check voltage of A/C pressure sensor connector 5-volt sensor supply wire (Violet/White wire). If voltage is less than 4.9 volts, repair 5-volt sensor supply wire. Perform TEST VER-2. If voltage is more than 4.9 volts, go to next step.
  6. With A/C pressure sensor still disconnected, read A/C pressure sensor voltage value. If sensor voltage is more than 4.5 volts, replace A/C pressure sensor. Perform TEST VER-2. If sensor voltage is less than 4.5 volts, turn ignition off.
  7. Disconnect Powertrain Control Module (PCM). Place DRB-II in ohmmeter mode. Using DRB-II, check resistance of A/C pressure sensor connector sensor ground wire (Black/Light Blue wire). If resistance is less than 5 ohms, repair A/C pressure sensor ground wire for a short to ground. Perform TEST VER-2. If resistance is more than 5 volts, replace PCM. Perform TEST VER-2.
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