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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 519 (Symptom Troubleshooting [Automatic Transmission]) >> No. 9 Abnormal Shift >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2005 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.
ABNORMAL SHIFT - DIAGNOSTIC PROCEDURE

STEP INSPECTION ACTION
1
  • Inspect for continuity between TCM terminal AP and ground.
  • Is there continuity?
 Yes Go to next step.
No Repair or replace ground circuit.
2
  • Make sure abnormal shift driving condition
  • Inspect for any abnormal signal change at the following TCM terminals when abnormal shift occurs:
    • D, 2, or 1 range signal (TCM C, B, or A)
    • Throttle position sensor signal (TCM terminal U)
    • Output speed sensor signal (TCM terminals AE and AF)
    • Input/turbine speed sensor signal (TCM terminals W and Z)
  • Are all signals okay?
 Yes Go to next step.
No Inspect related wiring harness and sensor for intermittent open or short circuit.
3
  • Connect WDS or equivalent to data link connector-2.
  • Access TP and VSS PIDs.
  • Drive vehicle.
  • Inspect the following TCM terminal voltages at each shift point while monitoring TP and VSS PIDs:

    (See TYPICAL SHIFT DIAGRAM . )

    • 1GR
      • TCM terminal AQ: B+ 
      • TCM terminal AN: 0 V 
    • 2GR
      • TCM terminal AQ: B+ 
      • TCM terminal AN: B+ 
    • 3GR
      • TCM terminal AQ: 0 V 
      • TCM terminal AN: B+ 
    • 4GR
      • TCM terminal AQ: 0 V 
      • TCM terminal AN: 0 V 
  • Are terminal voltages okay?
 Yes Inspect for continuity between TCM terminal and shift solenoid terminal. Inspect if shift solenoid is stuck. (See SOLENOID VALVES INSPECTION . )
  • If okay, overhaul control valve body and repair or replace any defective parts.
  • If problem remains, replace or overhaul transmission and repair or replace any defective parts.
No Inspect for bending, damage, corrosion, or loose connection TCM terminal.
4
  • Verify test results.
    • If okay, return to diagnostic index to service any additional symptoms.
    • If malfunction remains, inspect related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis.
      • If vehicle is repaired, troubleshooting completed.
      • If vehicle is not repaired or additional diagnostic information is not available, replace TCM.
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