DTC P1598-A: A/C PRESSURE SENSOR VOLTS TOO HIGH Chrysler LHS II

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION . 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: ROAD TEST VERIFICATION»(ref-576-S22124556262000030800000) .
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, PCM failure or open A/C pressure sensor ground circuit. 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»(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) .
5. Disconnect A/C pressure sensor connector. Using a 12-volt test light, check voltage of A/C pressure sensor signal circuit at A/C pressure sensor connector. See «A/C PRESSURE SENSOR CONNECTOR WIRE IDENTIFICATION»(ref-576-S26970584422000030800000) table. If test light is not brightly illuminated, go to next step. If test light is brightly illuminated, repair short to voltage on A/C pressure sensor signal circuit. Perform «TEST VER-2A: ROAD TEST VERIFICATION»(ref-576-S22124556262000030800000) .
6. 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»(ref-576-S26970584422000030800000) 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: ROAD TEST VERIFICATION»(ref-576-S22124556262000030800000) .
7. 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: ROAD TEST VERIFICATION»(ref-576-S22124556262000030800000) .
8. Remove jumper wire. 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 PCM connector terminal No. 42. See «A/C PRESSURE SENSOR CONNECTOR WIRE IDENTIFICATION»(ref-576-S26970584422000030800000) table and «PCM CONNECTOR WIRE IDENTIFICATION»(ref-576-S12358669842000030800000) table. If resistance is 5 ohms or more, repair open A/C pressure sensor signal circuit. Perform «TEST VER-2A: ROAD TEST VERIFICATION»(ref-576-S22124556262000030800000) . If resistance is less than 5 ohms, replace PCM. Perform «TEST VER-2A: ROAD TEST VERIFICATION»(ref-576-S22124556262000030800000) .

A/C PRESSURE SENSOR CONNECTOR WIRE IDENTIFICATION

PCM CONNECTOR WIRE IDENTIFICATION