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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P1464: A/C Control Signal - Malfunction >> Diagnostic Procedures

Diagnostic Procedures

  1. If QUICK TEST was not performed, go to QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If QUICK TEST was performed, go to next step.
    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. Turn ignition on, engine off. Access ACCS PID from PID/DATA MONITOR AND RECORD. If ACCS PID is off, verify operation of A/C demand switch. Refer to SYMPTOM TESTS 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 (Violet wire) to A/C cycling switch. See WIRING DIAGRAMS article. 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 (Violet/White wire). Turn ignition off. If voltage reading was less than one volt, go to next step. If voltage reading was not less than one volt, repair short to power in A/C clutch power circuit (Violet/White wire) between PCM 104-pin harness connector terminal No. 71 and A/C clutch relay 5-pin harness connector terminal No. 2. 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 less than one volt, 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 less than one volt, 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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