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Test TC-90A - A/C Pressure Sensor Volts Too High

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 4.6 volts or less, go to next step. If A/C pressure sensor voltage is more than 4.6 volts, go to step 5).
  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 HIGH DTC sets if Powertrain Control Module (PCM) terminal No. 42 is more than 4.9 volts. Possible causes are: open A/C pressure sensor signal circuit, 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. Connect a jumper wire between A/C pressure sensor signal circuit and ground circuit at A/C pressure sensor connector. See A/C PRESSURE SENSOR CONNECTOR WIRE IDENTIFICATION  table. Using scan tool, read A/C pressure sensor voltage. If voltage is one volt or more, go to next step. If voltage is less than one volt, replace A/C pressure sensor. Perform TEST VER-2A .
  6. Move jumper wire from A/C pressure sensor connector ground circuit to an engine ground. Using scan tool, read A/C pressure sensor voltage. If voltage is one volt or more, go to next step. If voltage is less than one volt, repair open A/C pressure sensor ground circuit. Perform TEST VER-2A .
  7. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Using external ohmmeter, check resistance of A/C pressure sensor signal circuit between A/C pressure sensor connector and PCM connector terminal 42. See A/C PRESSURE SENSOR CONNECTOR WIRE IDENTIFICATION  table. If resistance is 5 ohms or more, repair open A/C pressure sensor signal circuit. Perform TEST VER-2A . If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2A .
A/C PRESSURE SENSOR CONNECTOR WIRE IDENTIFICATION

Application Wire Color
A/C Pressure Sensor Signal Circuit Dark Blue
A/C Pressure Sensor 5-Volt Supply Circuit Violet/White
A/C Pressure Sensor Ground Circuit Black/Light Blue
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