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Test D: A/C Inoperative/Does Not Operate Properly

NOTE: If PID WACF reads ON, this is same fault as DTC P1460.
  1. Ensure ambient temperature is above 50°F (10°C). Turn ignition on. Turn EATC module to OFF. Perform PCM Parameter Identification WOT A/C Primary Circuit Fault (PID WACF) test. If PID WACF reads ON, perform PCM self-diagnostics. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. If PID WACF does not read ON, go to next step.
  2. Perform PCM PID WAC. If PID WAC does not read ON, go to next step. If PID WAC reads ON, perform PCM self-diagnostics. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
  3. Perform PCM PID ACC. Press MAX A/C on EATC control panel. If PID ACCS reads ON, go to next step. If PID ACCS does not read ON, go to step  5.
  4. Perform PCM PID WAC. If PID WAC does not read ON, perform PCM self-diagnostics. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. If PID WAC reads ON, go to step  12.
  5. Turn ignition off. Disconnect high pressure cut-off 4-pin harness connector C150. Turn ignition on. Measure voltage between ground and high pressure cutoff switch harness connector C150 Pink/Light Blue wire terminal. If more than 10 volts exists, go to step  10. If 10 volts or less exists, go to next step.
  6. Turn ignition off. Disconnect A/C cycling switch 4-pin harness connector C155. Turn ignition on. Measure voltage between ground and A/C cycling switch harness connector C155 Violet wire terminal. If more than 10 volts exists, go to next step. If 10 volts or less exists, go to step  8.
  7. Turn ignition off. Connect a fused jumper between A/C cycling switch harness connector C155 Violet wire terminal and Pink/Light Blue wire terminals. Turn ignition on. Measure voltage between ground and high pressure cut-off switch harness connector Pink/Light Blue wire terminal. If more than 10 volts exists, go to step  9. If 10 volts or less exists, repair open in Pink/Light Blue wire. See WIRING DIAGRAMS . Recheck system operation.
  8. Turn ignition off. Disconnect EATC module 13-pin harness connector C228. Measure resistance of Violet wire between EATC module harness connector C228 terminal No. 11 and A/C cycling switch harness connector. See Figure. If resistance is less than 5 ohms, replace EATC module. Recheck system operation. If resistance is 5 ohms or more, repair open or high resistance in Violet wire. See WIRING DIAGRAMS . Recheck system operation.
  9. Turn ignition off. Connect manifold gauge set to service ports and observe pressure. If pressure is between 50 psi (3.5 kg/cm2 ) and 250 psi (17.6 kg/cm2 ), replace A/C cycling switch. Recheck system operation. If pressure is not between 50 psi (3.5 kg/cm2 ) and 250 psi (17.6 kg/cm2 ), check refrigerant system for leaks and service as needed. Recheck system operation.
  10. Turn ignition off. Connect a fused jumper between A/C pressure cut-off switch harness connector C150 Pink/Light Blue wire terminal and Black/Yellow wire terminal. If A/C compressor clutch engages, replace A/C pressure cut-off switch. Recheck system operation. If A/C compressor does not engage, go to next step.
  11. Remove fused jumper. Disconnect PCM 104-pin harness connector C185. Connect EEC-V 104-pin breakout box to PCM harness connector. Do not connect breakout box to PCM. Measure resistance between A/C pressure cut-off switch harness connector C150 Black/Yellow wire terminal and breakout box pin No. 41. If resistance is less than 5 ohms, replace PCM. Recheck system operation. If resistance is 5 ohms or more, repair open or high resistance in Black/Yellow wire. See WIRING DIAGRAMS . Recheck system operation.
  12. Turn ignition off. Disconnect compressor clutch 2-pin harness connector C137. Turn ignition on. Measure voltage between ground and compressor clutch harness connector C137 Gray/White wire terminal. If more than 10 volts exists, go to next step. If 10 volts or less exists, go to step  14.
  13. Measure resistance between ground and compressor clutch harness connector C137 Black wire terminal. If resistance is less than 5 ohms, go to step  16. If resistance is 5 ohms or more, repair open or high resistance in Black wire. See WIRING DIAGRAMS . Recheck system operation.
  14. Remove A/C WOT CUTOUT relay from relay box (located in left side of engine compartment. Measure resistance of Gray/White wire between compressor clutch harness connector C137 and A/C WOT CUTOUT relay connector socket terminal No. 87. See Fig 1. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open or high resistance in Gray/White wire. See WIRING DIAGRAMS . Recheck system operation.
    Fig 1: Identifying A/C WOT Cutout Relay Connector Socket Terminals
    G96H29337Courtesy of FORD MOTOR CO.
  15. Turn ignition on. measure voltage between ground and A/C WOT CUTOUT relay connector socket terminal No. 30 (Violet/Orange wire). If more than 10 volts exists, go to step  17. If 10 volts or less exists, repair open in Violet/Orange wire between central junction box fuse No. 5 (15-amp) and A/C WOT CUTOUT relay. See WIRING DIAGRAMS . Recheck system operation.
  16. Measure A/C compressor clutch gap at 3 equally spaced positions. If A/C clutch gap is more than 0.033" (0.85 mm), adjust A/C compressor air gap to 0.014-0.033" (0.35-0.85 mm). Recheck system operation. If A/C clutch gap is not more than 0.033" (0.85 mm), replace A/C compressor clutch solenoid. Recheck system operation.
  17. Turn ignition on. Measure resistance between ground and A/C WOT CUTOUT relay connector socket terminal No. 85 (Pink/Yellow wire). If resistance is less than 5 ohms, replace A/C WOT CUTOUT relay. Recheck system operation. If resistance is 5 ohms or more, go to next step.
  18. Turn ignition off. Disconnect PCM 104-pin harness connector C185. Connect EEC-V 104-pin breakout box to PCM harness connector C185. Do not connect breakout box to PCM. Measure resistance between A/C WOT CUTOUT relay connector socket terminal No. 85 (Pink/Yellow wire) and breakout box terminal No. 69. If resistance is less than 5 ohms, replace PCM. Recheck system operation. If resistance is 5 ohms or more, repair open or high resistance in Pink/Yellow wire. See WIRING DIAGRAMS . Recheck system operation.
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