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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 39 (Automatic Transmission - Diagnosis - GF4A-El) >> Diagnostic Tests >> DTC P0715: Input/Turbine Speed Sensor Circuit Fault >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2002 Mazda Millenia and 2001 Mazda Millenia. However, it is still accessible from the selected car via links, so may be relevant.
  1. Record FREEZE FRAME PID data. Check for related service bulletins. Repair as necessary. Connect scan tool to DLC. Turn ignition on. Using scan tool, access TURBINE PID from PID/DATA MONITOR & RECORD menu. Note TURBINE PID value. Start engine and allow it to idle. Record TURBINE PID value. TURBINE PID value should be zero RPM with ignition switch turned to ON position and 600-700 RPM at idle. If TURBINE PID value is as specified, check connectors, terminals and wiring harnesses for intermittent concern. Repair as necessary, then go to next step. If TURBINE PID value is not as specified, check input/turbine speed sensor connector for damage or pulled out terminals or corrosion. Repair connector as necessary. If connector is okay, go to next step.
  2. Inspect input/turbine speed sensor. See INPUT/TURBINE SPEED SENSOR  under COMPONENT TESTS. If input/turbine speed sensor is faulty, replace sensor. If input/turbine speed sensor is okay, remove sensor and inspect sensor pickup for contamination. Clean and reinstall sensor. If sensor is not contaminated, disconnect PCM connector and check PCM connector for damage or pulled out terminals or corrosion. Repair as necessary. If PCM connector is okay, check continuity between input/turbine speed sensor harness connector terminal "A" and PCM harness connector terminal 2T. Check for continuity between input/turbine speed sensor harness connector terminal "B" and PCM harness connector terminal 2P. See Figure. If continuity exist at both points, go to next step. If continuity does not exist at either point, repair open in affected circuit. See WIRING DIAGRAMS .
  3. Check for continuity in circuits between chassis ground and input/turbine speed sensor harness connector terminals "A" and "B". If continuity does not exist at either point, check connectors, terminals and wiring harnesses for intermittent concern. Repair as necessary, then go to next step. If continuity exists, repair short to ground in affected circuit, then go to next step. See WIRING DIAGRAMS .
  4. Start engine and allow it to idle. Using scan tool, access VS PID from PID/DATA MONITOR & RECORD menu. Road test vehicle with VS PID value at 25 MPH for 5 seconds. Determine if DTC P0715 is still present. See RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. If serviced DTC resets, replace PCM. If DTC does not reset, repair is complete.
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