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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 82 (Automatic Transmission Diagnosis - ALLISON) >> Diagnostic Tests >> DTC P1726: Solenoid "D" Controlled Clutch Engaged (2001) >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Did you perform the diagnostic system check? If so, go to next step. If not, see DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.
  2. Check the transmission fluid level. See appropriate AUTOMATIC article in TRANSMISSION SERVICING. Is the transmission fluid level correct? If so, go to next step. If not, see appropriate AUTOMATIC article in TRANSMISSION SERVICING.
  3. Install the scan tool. Start the engine. Record the DTC and failure records. Use the failure record data to determine during which shift the DTC was set. Using the scan tool, measure ignition voltage. Is the voltage 9-18 volts? If so, go to next step. If not, see DTC P0562: SYSTEM VOLTAGE LOW  or DTC P0563: SYSTEM VOLTAGE HIGH  .
  4. Drive the vehicle under normal operating conditions. Make the shift determined in step  3. Using the scan tool, monitor engine, turbine, and output speed sensor readings. Is the speed sensor data erratic or are signal dropouts indicated? If so, see DIAGNOSTIC TROUBLE CODE DEFINITIONS  under SELF-DIAGNOSTIC SYSTEM. If not, go to next step.
  5. Connect a pressure gauge to the line pressure tap. See HYDRAULIC PRESSURE TESTS  under PERFORMANCE TESTS. Using the scan tool in clutch test mode, cycle through all transmission gear ranges with the engine at idle and vehicle brakes applied. Record line pressure in each gear range. Was the line pressure low in a specific gear range or in gear ranges where the same clutch was applied? If so, see SYMPTOM DIAGNOSIS  under TROUBLE SHOOTING. If not, go to next step.
    6. CAUTION: When using the scan tool to perform a clutch test in 4th or 5th gear, never exceed 1400 RPM under stall conditions (with brakes held), or transmission damage may occur.
  6. Using the scan tool, select clutch test mode. With brakes applied, place gearshift lever in Drive. At 600 RPM, select and attain 1st gear. Turbine speed should go to zero. Increase engine speed to 1400 RPM. Monitor turbine speed. Turbine speed should remain at zero. Repeat procedure for 2nd, 3rd, 4th, and 5th gears. Did turbine speed remain at zero in all gears? If so, see DIAGNOSTIC AIDS . If not, go to next step.
  7. Remove the dipstick and inspect the transmission fluid for clutch debris or burnt odor. If necessary, drain a small amount of fluid for this inspection. Are there signs of a clutch failure? If so, go to next step. If not, go to step  9.
  8. Remove the transmission for overhaul or replacement. Is overhaul or replacement complete? If so, go to step  11.
  9. Inspect for stuck or sticking trimmer valve. Did you find and repair the valve problem? If so, go to step  11. If not, go to next step.
  10. Replace solenoid "D". See SOLENOID VALVES  under REMOVAL & INSTALLATION. Is solenoid replacement complete? If so, go to next step.
  11. Perform the following procedure to verify the repair:
    • Clear the DTC.
    • Reset adaptive for all shifts.
    • Operate the vehicle in all gear ranges under normal driving conditions.

    Did the DTC return? If so, go to step  1. If not, system is okay.

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