Note. For connector terminal ID, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article.
- 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.
- 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: ROAD TEST VERIFICATION»(ref-576-S22124556262000030800000) .
- 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.
- Inspect all related wiring and connectors and repair as necessary. If no problems were found with wiring and connectors, see «INACTIVE TROUBLE CODE CONDITION»(ref-576-S27765318282000030800000) under SELF-DIAGNOSTICS. Test is complete. Perform «TEST VER-2A: ROAD TEST VERIFICATION»(ref-576-S22124556262000030800000) . If related wiring and connectors were repaired, perform «TEST VER-2A: ROAD TEST VERIFICATION»(ref-576-S22124556262000030800000) .
- Disconnect A/C pressure sensor connector. Using a voltmeter, check voltage on A/C pressure sensor connector 5-volt supply circuit. See «A/C PRESSURE SENSOR CONNECTOR WIRE IDENTIFICATION»(ref-576-S02585121922000030800000) 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: ROAD TEST VERIFICATION»(ref-576-S22124556262000030800000) .
- 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: ROAD TEST VERIFICATION»(ref-576-S22124556262000030800000) .
- Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Using an ohmmeter, check resistance of A/C pressure sensor signal circuit between A/C pressure sensor connector and ground. See «A/C PRESSURE SENSOR CONNECTOR WIRE IDENTIFICATION»(ref-576-S02585121922000030800000) 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: ROAD TEST VERIFICATION»(ref-576-S22124556262000030800000) .
- Using an ohmmeter, check resistance between PCM connector terminals No. 42 and 43. See «PCM CONNECTOR WIRE IDENTIFICATION»(ref-576-S38587987542000030800000) table. If resistance is 5 ohms or more, replace PCM. Perform «TEST VER-2A: ROAD TEST VERIFICATION»(ref-576-S22124556262000030800000) . If resistance is less than 5 ohms, repair A/C pressure sensor signal circuit for a short to sensor ground circuit. Perform «TEST VER-2A: ROAD TEST VERIFICATION»(ref-576-S22124556262000030800000) .
| 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 |
A/C PRESSURE SENSOR CONNECTOR WIRE IDENTIFICATION
| Application | Wire Color | |
|---|---|---|
| PCM Terminal No. 42 | ||
| A/C Pressure Sensor Signal Circuit | Dark Blue | |
| PCM Terminal No. 43 | ||
| A/C Pressure Sensor Ground Circuit | Black/Light Blue | |
PCM CONNECTOR WIRE IDENTIFICATION