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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 5 (Engine Controls - Tests W/Codes - 2.3L) >> Circuit Tests >> DTC P0510 - Closed Throttle Position Switch Malfunction >> Diagnosis & Repair Procedure

Diagnosis & Repair Procedure

WARNING: This page is about a different car, the 1997 Mazda Millenia. However, it is still accessible from the selected car via links, so may be relevant.
  1. Inspect all applicable harness connectors. Repair as needed. Turn ignition on. Access ECM harness connector. ECM is mounted in front of center console, under radio. Using voltmeter, backprobe applicable ECM harness connector. Measure voltage between ground and terminal No. 3X.
  2. Voltage should be less than one volt with accelerator released, or battery voltage with accelerator pedal depressed. If voltage is within specification, go to step 5). If voltage is not within specification, go to next step.
  3. Turn ignition off. Disconnect ECM harness connectors. Check continuity of Black/Yellow wire between terminal No. 3AB on ECM connector and terminal "D" on TP sensor harness connector. Repair as needed. If continuity exists, go to next step.
  4. Check continuity of Brown wire between terminal No. 3X on ECM connector and terminal "C" on TP sensor harness connector. Repair as needed. If continuity exists, go to next step.
  5. Inspect closed throttle position switch portion of throttle position sensor. See appropriate SYSTEM/COMPONENT TESTS - 2.3L article. Replace TP sensor as needed. If TP sensor is okay, go to next step.
  6. Erase DTCs. See CLEARING CODES  in SELF-DIAGNOSTIC SYSTEM section. If DTC resets, replace ECM. If DTC is not present, intermittent poor harness connection may have caused DTC to originally set.
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