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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 69 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0645 Or DTC P1460 >> Diagnostic Procedures

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: During following step, if Continuous Memory DTC P1460 is present, Go to step  8.
    NOTE: For A/C always ON, refer to appropriate SYMPTOM TESTS in MANUAL A/C-HEATER SYSTEMS - TRIBUTE article in AIR-CONDITIONING & HEATING.
    NOTE: Verify A/C and defrost were off during KOEO/KOER self-tests. If vehicle is not equipped with A/C, ACCR circuit is not used and DTC 1460 can be ignored.
  2. KOEO/KOER DTC P1460: Verify ACCS PID Is Off -  Start engine. Turn off A/C and defroster. Using scan tool, select DIAGNOSTIC DATA LINK. Select PCM. Select PID/DATA MONITOR AND RECORD. Access A/C Control Signal (ACCS) PID. If ACCS PID is off, turn ignition off and go to next step. If ACCS PID is not off, turn ignition off and go to step  2 of DTC P1464: A/C CONTROL SIGNAL MALFUNCTION to check A/C circuits for short to power.
  3. Check For VPWR To A/C Clutch Relay -  Disconnect A/C clutch relay. Turn ignition on, engine off. Measure voltage of VPWR circuit between ground and A/C clutch relay 5-pin harness connector terminal No. 1 (White/Violet wire). See Fig 1 and Fig 2 . If voltage reading is more than 10.5 volts, go to next step. If voltage is not as specified, repair open in VPWR circuit. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. Reconnect A/C clutch relay. Start engine. Turn A/C on, wait 15 seconds. Turn A/C off. Turn ignition off. Go to step  10.
    Fig 1: Identifying A/C Clutch Relay 5-Pin Harness Connector
    G00193643Courtesy of MAZDA MOTORS CORP.
    Fig 2: Identifying A/C Clutch Relay Circuit
    G00158991Courtesy of MAZDA MOTORS CORP.
  4. Check A/C Clutch Relay -  Turn ignition off. Refer to terminal numbers molded on A/C clutch relay. Measure resistance between A/C clutch relay terminals No. 1 and 2. See Fig 1. Resistance reading should be 40-120 ohms. Measure resistance between A/C clutch relay terminals No. 3 and 5. Resistance reading should be more than 10,000 ohms. If all resistance checks are okay, go to next step. If any resistance checks are not as specified, replace A/C clutch relay. Start engine. Turn A/C on, wait 15 seconds. Turn A/C off. Turn ignition off. Go to step  10.
  5. Check A/C Clutch Circuit For Short To Power In Harness -  Turn ignition off. 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 ground and breakout box terminal No. 69 (ACCR). 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. After repair, remove breakout box. Reconnect all components. Start engine. Turn A/C off. Turn ignition off. Go to step  10.
  6. Check ACCR Circuit For Short To Ground In Harness -  Disconnect scan tool from DLC. Measure resistance of ACCR circuit between ground and A/C clutch relay 5-pin harness connector terminal No. 2 (Pink/Yellow wire). See Fig 1 and Fig 2 . If resistance reading is more than 10,000 ohms, go to next step. If resistance reading is not more than 10,000 ohms, repair short circuit in Pink/Yellow wire between A/C clutch relay 5-pin harness connector terminal No. 2 and PCM 104-pin harness connector terminal No. 69. SSee appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. After repair, start engine. Turn A/C on, wait 15 seconds. Turn A/C off. Turn ignition off. Go to step  10.
  7. Check ACCR Circuit Continuity -  Measure resistance of ACCR circuit between breakout box terminal No. 69 and A/C clutch relay 5-pin harness connector terminal No. 2 (Pink/Yellow wire). If resistance reading is less than 5 ohms, replace PCM. Reconnect all components. Start engine. Turn A/C on, wait 15 seconds. Turn A/C off. Turn ignition off. After repair, go to step  10. If resistance reading is not less than 5 ohms, repair open circuit in Pink/Yellow wire between A/C clutch relay 5-pin harness connector terminal No. 1 and PCM 104-pin harness connector terminal No. 69. Reconnect all components. Start engine. Turn A/C on, wait 15 seconds. Turn A/C off. Turn ignition off. Go to step  10.
    8. NOTE: If vehicle is not equipped with A/C, ACCR circuit is not used and P1460 can be ignored.
    NOTE: During following procedure, A/C clutch will click on when a fault is indicated.
  8. Continuous Memory DTC 1460: Check ACCR Circuit For Intermittent Short To Ground -  Turn ignition on, engine off. Check ACCR circuit for short to ground while performing following:
    • Shake, wiggle and bend ACCR circuit between PCM and A/C clutch relay. See Fig 1 and Fig 2 .
    • Lightly tap on A/C clutch relay (to simulate road shock).
    If no fault is indicated, go to next step. If a fault is indicated, turn ignition off. Repair as necessary. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. Reconnect all components. Start engine. Turn A/C on, wait 15 seconds. Turn A/C off. Turn ignition off. Go to step  10.
    9. NOTE: A/C clutch will click off when a fault is indicated.
  9. Check ACCR Circuit For Intermittent Open Or Short To Power -  Using scan tool, select DIAGNOSTIC DATA LINK. Select PCM. Select ACTIVE COMMAND MODES. Access OUTPUT TEST MODE TURN OUTPUTS ON. Check ACCR circuit for open or short to power while performing following:
    • Shake, wiggle and bend ACCR circuit between PCM and A/C clutch relay.
    • Shake, wiggle and bend VPWR circuit to A/C clutch relay.
    • Lightly tap on A/C clutch relay (to simulate road shock).
    If a fault is indicated, turn ignition off. Repair as necessary. Reconnect all components. Start engine. Turn A/C on, wait 15 seconds. Turn A/C off. Turn ignition off. Go to step  10. If a fault is not indicated, fault is intermittent. Refer to INTERMITTENT  testing under SYSTEM TESTS.
  10. 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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