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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 519 (Symptom Troubleshooting [Automatic Transmission]) >> No. 6 Low Maximum Speed And Poor Acceleration >> 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.
LOW MAXIMUM SPEED AND POOR ACCELERATION - DIAGNOSTIC PROCEDURE

STEP INSPECTION ACTION
1. Yes Go to next step.
No Repair or replace any defective parts according to inspection results.
2
  • Disconnect shift solenoid connector.
  • Does vehicle operate as follows?
    • D range-4GR (fixed) 
    • 2 range-3GR (fixed) 
    • 1 range-1GR (fixed) 
    • R position-Reverse 
 Yes Go to next step.
No
  • 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.
3
  • Connect shift solenoid connector.
  • Drive vehicle in D, 2, and 1 ranges (O/D OFF switch is off).
  • Does vehicle start from stop in first gear?
 Yes Go to next step.
No
  • Inspect voltage at TCM terminals AQ and AN in D, 2, and 1 ranges.

    (See TRANSMISSION CONTROL MODULE (TCM) INSPECTION . )

    • If not, inspect body ground condition and TCM terminal AS and AR voltage (B+).
    • If okay, inspect shift solenoid terminals for bending, damage, corrosion, or loose connection.

      Specification 

      1. TCM terminal AQ: B+ 
      2. TCM terminal AN: 0 V 
  • Inspect for continuity between following wiring harness:
    • Shift solenoid ground circuit
    • TCM terminal AQ-Shift solenoid terminal B
    • TCM terminal AN-Shift solenoid terminal A
4
  • 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 monitored by 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
  • Replace torque converter.
    • If problem remains, replace or overhaul automatic transmission and repair or replace any defective parts.
No If no shift up from 1GR in D range: 
  • Inspect output speed sensor and related wiring harness.

If shifts up from 1GR to 4GR in D range: 
  • Inspect shift solenoid B and related wiring harnesses.

For other results: 
  • Inspect the following TCM connector terminal voltages while driving in suspect condition:
    • Throttle position sensor signal (TCM terminal U)
    • Input/turbine speed sensor (TCM terminals W and Z)
    • Output speed sensor (TCM terminals AE and AF)
      • If okay, inspect shift solenoids
5
  • 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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