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Diagnostic Procedures

WARNING: This page is about a different car, the 2003 Mazda Tribute. However, it is still accessible from the selected car via links, so may be relevant.
  1. If QUICK TEST was not performed, go to QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If QUICK TEST was performed, go to next step.
    2. NOTE: Verify that A/C and defrost were OFF during Self-Test. If A/C or defrost were on, turn off and rerun Self-Test.
  2. DTC P1464: Check ACCS PID -  Turn ignition on, engine off. Turn A/C and defrost off. Using scan tool, select DIAGNOSTIC DATA LINK. Select PCM. Select PID/DATA MONITOR AND RECORD. Access ACCS PID. If ACCS PID is on, go to next step. If ACCS PID is not on, ACCS input to PCM is low. Verify test results. Rerun Self-Test where DTC P1464 was received. Go to step  7.
  3. ACCS PID On: Disconnect A/C Cycling Switch & Check If ACCS PID Turns Off -  Turn ignition off. Disconnect A/C Cycling Switch (ACCS). Turn ignition on, engine off. Access ACCS PID from PID/DATA MONITOR AND RECORD. If ACCS PID is on, go to next step. If ACCS PID is off, verify operation of A/C demand switch. Refer to appropriate SYMPTOM TESTS in MANUAL A/C-HEATER SYSTEMS - TRIBUTE article in AIR-CONDITIONING & HEATING. If okay, repair short to power in A/C demand circuit to ACCS. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. After repair, go to step  7.
  4. Check Power To A/C Clutch Circuit For Short To Power -  Turn ignition off. Disconnect A/C clutch relay. Turn ignition on, engine off. Measure voltage between ground and A/C clutch power circuit at 5-pin harness connector. Turn ignition off. If voltage reading was less than one volt, go to next step. If voltage reading was not as specified, repair short to power in A/C clutch power circuit. After repair, go to step  7.
  5. Check ACCS Circuit For Short To Power -  Disconnect PCM 104-pin harness connector. Connect Breakout Box (49-UN01-130) to PCM harness connector only. See Figure. Turn ignition on, engine off. Measure voltage between breakout box terminals No. 41 (ACCS) and No. 103 (PWR GND). Turn ignition off. If voltage reading was less than one volt, go to next step. If voltage reading was not as specified, repair short to power in ACCS circuit (Dark Green/Orange wire) between PCM 104-pin harness connector terminal No. 41 and A/C high pressure switch 4-pin harness connector terminal No. 1. See Fig 1. After repair, go to step  7.
    Fig 1: Identifying ACPSW & ACCS Circuits & Harness Connector Terminals
    G00013307Courtesy of FORD MOTOR CO.
  6. Check ACCS Circuit Voltage To PCM With A/C Clutch Relay Connected -  Reconnect A/C clutch relay. Turn ignition on, engine off. Measure voltage between breakout box terminals No. 41 (ACCS) and No. 103 (PWR GND). Turn ignition off. If voltage reading was less than one volt, replace PCM. After repair, go to next step. If voltage reading was not as specified, replace A/C clutch relay. After repair, go to next step.
  7. Verify Trouble Shooting Of DTCs Completed -  Reconnect all disconnected connectors. Clear DTCs from PCM memory using scan tool. Perform QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If same DTC is present, replace faulty PCM. Repeat QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If same DTC is not present, go to applicable procedure for other DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no DTCs are present, trouble shooting is complete.
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