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Test NTC-26A: Checking A/C System

NOTE: This test applies to AB, TJ, XJ and ZJ bodies only. For connector terminal identification, see CONNECTOR IDENTIFICATION . For component location and wiring diagram, see WIRING DIAGRAMS article.
  1. If A/C CLUTCH RELAY DTC is present, perform TEST NTC-16A: CHECKING BRAKE SWITCH . If DTC is not present, use scan tool to monitor A/C SELECT state. Turn A/C switch on and off several times. If A/C SELECT state does not change, repair open A/C select circuit (Dark Blue/Orange wire) and perform TEST VER-2A: ROAD TEST VERIFICATION . If A/C SELECT state changes, go to next step.
  2. Using scan tool, monitor A/C REQUEST state. Turn A/C fan to FULL position. If A/C REQUEST state does not change, go to step 9)  . If A/C REQUEST state changes, go to next step.
  3. Using scan tool, actuate A/C clutch relay. If A/C clutch actuates, A/C clutch is operating properly at this time. Test is complete. If A/C clutch does not actuate, go to next step.
  4. Disconnect A/C clutch connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A: ROAD TEST VERIFICATION . If connector and terminals are okay, ensure scan tool is still actuating A/C clutch relay and go to next step.
  5. On all bodies except AB body, go to next step. On AB body, connect a 12-volt test light across A/C clutch connector terminals. If test light blinks, replace A/C clutch coil and perform TEST VER-2A: ROAD TEST VERIFICATION . If test light does not blink, perform TEST NTC-26B: CHECKING A/C SYSTEM .
  6. Using an external voltmeter, check voltage on A/C clutch connector, A/C clutch relay output circuit (Dark Blue/Black wire). If voltage pulsates, replace A/C clutch coil and perform TEST VER-2A: ROAD TEST VERIFICATION . If voltage does not pulsate, go to next step.
  7. Remove A/C clutch relay. Check voltage on A/C clutch relay connector, fused B+ circuit (Red/Gray wire on TJ and ZJ bodies; Red/Black wire on XJ body). If voltage is 11 volts or less, repair open fused B+ circuit and perform TEST VER-2A: ROAD TEST VERIFICATION . If voltage is more than 11 volts, go to next step.
  8. Using an external ohmmeter, check resistance of A/C clutch relay output circuit (Dark Blue/Black wire on TJ and XJ bodies; Dark Blue/Yellow wire on ZJ body) between A/C clutch and A/C clutch relay connectors. If resistance is 5 ohms or more, repair open A/C clutch relay output circuit and perform TEST VER-2A: ROAD TEST VERIFICATION . If resistance is less than 5 ohms, replace A/C clutch relay and perform TEST VER-2A: ROAD TEST VERIFICATION .
  9. Ensure A/C system is properly charged. Recharge system as necessary and perform TEST VER-2A: ROAD TEST VERIFICATION . If A/C system is properly charged, go to next step.

  10. On all bodies, except AB body, go to next step. On AB body, check fin sensing cycling clutch switch operation. See MANUAL A/C-HEATER SYSTEMS

    RAM VAN/WAGON article in appropriate lemon-25® AIR CONDITIONING & HEATING SERVICE & REPAIR manual. Replace fin sensing cycling clutch switch as necessary and perform TEST VER-2A: ROAD TEST VERIFICATION . If fin sensing cycling clutch switch is okay, go to next step.

  11. Check high pressure cut-off switch. See MANUAL A/C-HEATER SYSTEMS

    RAM VAN/WAGON article in appropriate lemon-25® AIR CONDITIONING & HEATING SERVICE & REPAIR manual. Replace high pressure cut-off switch as necessary and perform TEST VER-2A: ROAD TEST VERIFICATION . If high pressure cutoff switch is okay, go to next step.

  12. Check low pressure cut-off switch. See MANUAL A/C-HEATER SYSTEMS

    RAM VAN/WAGON article in appropriate lemon-25® AIR CONDITIONING & HEATING SERVICE & REPAIR manual. Replace low pressure cut-off switch as necessary and perform TEST VER-2A: ROAD TEST VERIFICATION . If low pressure cutoff switch is okay, repair open A/C request circuit (Dark Blue/Orange wire) and perform TEST VER-2A: ROAD TEST VERIFICATION .
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