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Test TC-91A - A/C Pressure Sensor Volts Too Low

NOTE: For connector terminal idnetification, see CONNECTOR IDENTIFICATION DIRECTORY  table. For wiring diagram, see WIRING DIAGRAMS article.
  1. Using scan tool, read A/C pressure sensor voltage. If A/C pressure sensor voltage is .2 volt or less, go to step 5). If A/C pressure sensor voltage is more than .2 volt, go to next step.
  2. While monitoring scan tool display, wiggle A/C pressure sensor connector and wiring harness. If voltage does not change while wiggling wiring harness, go to next step. If voltage changes while wiggling wiring harness, repair wiring harness as necessary that caused voltage to change. Perform TEST VER-2A .
  3. Condition to set trouble code is not present at this time. A/C PRESSURE SENSOR VOLTS TOO LOW DTC sets if Powertrain Control Module (PCM) terminal No. 42 is less than .5 volt or voltage is less than .7 volt for 22 seconds when A/C relay is energized. Possible causes are: A/C pressure sensor signal circuit shorted to ground, A/C pressure sensor internally open or PCM failure. Go to next step.
  4. Inspect all related wiring and connectors and repair as necessary. If no problems were found with wiring and connectors, see INACTIVE TROUBLE CODE CONDITION . Test is complete. Perform TEST VER-2A . If related wiring and connectors were repaired, perform TEST VER-2A .
  5. Disconnect A/C pressure sensor connector. Using scan tool in voltmeter mode, check voltage on A/C pressure sensor connector 5-volt supply circuit. See A/C PRESSURE SENSOR CONNECTOR WIRE IDENTIFICATION  table. If voltage is more than 4.9 volts, go to next step. If voltage is 4.9 volts or less, repair open 5-volt supply circuit. Perform TEST VER-2A .
  6. With A/C pressure sensor connector disconnected, using scan tool, read A/C pressure sensor voltage. If voltage is 4.5 volts or less, go to next step. If voltage is more than 4.5 volts, replace A/C pressure sensor. Perform TEST VER-2A .
  7. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Using scan tool in ohmmeter mode, check resistance of A/C pressure sensor signal circuit at A/C pressure sensor connector. See A/C PRESSURE SENSOR CONNECTOR WIRE IDENTIFICATION  table. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground on A/C pressure sensor signal circuit. Perform TEST VER-2A .
  8. Using external ohmmeter, check resistance of A/C pressure sensor signal circuit between A/C pressure sensor connector and PCM connector terminal No. 42. See A/C PRESSURE SENSOR CONNECTOR WIRE IDENTIFICATION  table. If resistance is less than 5 ohms, repair A/C pressure sensor signal circuit for a short to ground circuit. Perform TEST VER-2A . If resistance is 5 ohms or less, replace PCM. Perform TEST VER-2A .
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