LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Chrysler >> 1998 >> Cirrus >> Repair and Diagnosis >> Engine Performance >> System >> Engine Self-Diagnostics - With Codes >> DTC Test >> Test TC-148A: Torque Converter Clutch, No Rpm Drop Lockup
September 30: LEMON manuals is back up on a temporary server! Slowness is possible

Test TC-148A: Torque Converter Clutch, No Rpm Drop Lockup

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article.
NOTE: This procedure only applies to Neon.
  1. If vehicle is equipped with a manual transaxle, this DTC does not apply. If vehicle is equipped with an automatic transaxle, go to next step.
  2. If any of the following codes are present, these codes must be repaired prior to performing this test.
    • Torque Converter Clutch (TCC) solenoid.
    • Throttle Position (TP) sensor.
    • Vehicle Speed Sensor (VSS).
    • Camshaft or crankshaft sensors.
    • Internal Powertrain Control Module (PCM) failure. Using scan tool, erase trouble codes. Road test vehicle. Run vehicle in 3rd gear with torque converter unlocked for approximately 10 seconds. Apply heavy throttle until torque converter locks, then keep torque converter locked for approximately 5 seconds. Keep vehicle speed less than 70 MPH. Go to next step.
  3. Using scan tool, read trouble codes. If scan tool displays TORQ CONV CLU NO RPM DROP AT LOCKUP, go to step 7)  . If scan tool does not display TORQ CONV CLU NO RPM DROP AT LOCKUP, go to next step.
  4. Condition to set trouble code is not present at this time. TORQUE CONVERTER CLUTCH, NO RPM DROP LOCKUP DTC sets if torque converter malfunctions are detected. If torque converter is not locking or unlocking when desired. A minimum amount of improvement of torque converter efficiency is expected after lock-up is achieved. This expected improvement will not be seen if torque converter is malfunctioning. Two consecutive failures over 2 trips will store DTC. Go to next step.
  5. Possible causes are: front wheel size is larger than 23.51" (185/65-R14 standard wheel size for Neon), or smaller than 20.78" (T115/70-D14 spare tire size for Neon), low transmission oil level or pressure, debris in transmission oil, incorrect speedometer gear for front wheels, Part Throttle Unlock (PTU) solenoid not securely connected or stuck, malfunctioning lock-up valve in transmission, worn out friction material on friction disc in torque converter, failed gear box, differential, or axle shaft contacts, Powertrain Control Module (PCM) failure or poor wiring connections. Go to next step.
  6. Inspect all related wiring and connectors and repair as necessary. If no problems were found with wiring and connectors, see INACTIVE TROUBLE CODE CONDITION . Perform TEST VER-2A . If related wiring and connectors were repaired, perform TEST VER-2A .
  7. Check transmission fluid for debris and proper level. If transmission fluid is okay, go to next step. If transmission fluid is not okay, repair as necessary. Perform TEST VER-2A .
  8. Turn ignition off. Disconnect TCC solenoid connector. Turn ignition on. Using a voltmeter, check voltage of TCC solenoid connector Light Green/Black wire. If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair open Light Green/Black wire. Perform TEST VER-2A .
  9. Using a ohmmeter, check resistance between TCC solenoid terminals. If resistance is 30-50 ohms, go to next step. If resistance is not 30-50 ohms, replace TCC solenoid. Perform TEST VER-2A .
  10. Reconnect TCC solenoid connector. Disconnect 3-pin Vehicle Speed Sensor (VSS) connector. Remove VSS from transmission. See Fig 1. Inspect VSS for damage. Replace VSS as necessary. Perform TEST VER-2A . If VSS is okay, go to next step.
    Fig 1: TC-148A-1 Identifying Cooler Ports & Vehicle Speed Sensor (VSS) Location
    G96B01571
  11. Verify front tire size is NOT larger than 23.51" (185/65-R14 standard tire size for Neon), or smaller than 20.78" (T115/70-D14 spare tire size for Neon). Replace front tires as necessary. Perform TEST VER-2A . If front tires are correct size, go to next step.
  12. Tee a 0-300 psi (0-2069 kPa) gauge to transmission cooler in port on transmission. See Fig 1. Ensure gauge hose is long enough so gauge can be monitored. Road test vehicle. During road test, achieve 50 MPH. Pressure gauge will read approximately 15 psi (103 kPa) until lock-up is achieved. If TCC solenoid is operating properly, gauge will jump after lock-up. If gauge jumped, go to next step. If gauge did not jump, replace stuck TCC solenoid or repair torque converter as necessary. Perform TEST VER-2A .
  13. Maintain 50 MPH according to scan tool display. Wait 10 seconds in lock-up, then record engine RPM. If engine speed is 2150-2250 RPM, TCC is functioning properly at this time. Perform TEST VER-2A . If engine speed is not 2150-2250 RPM, problem appears to be in differential, output shaft or gear box. Repair transmission as necessary. Perform TEST VER-2A .
scientia non olet · About LEMON Manuals