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Home >> Suzuki >> 1996 >> Sidekick JS, 4D Utility, Standard >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Overhaul - 3L30 >> Electronic Testing >> Torque Converter Clutch (TCC)
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Torque Converter Clutch (TCC)

NOTE: Before performing the following procedures, connect a scan tool to Data Link Connector (DLC) and retrieve any stored Diagnostic Trouble Codes (DTCs). Repair any engine performance-related DTCs first. On Geo, a DTC P0740 identifies a TCC electrical circuit malfunction. On Suzuki, a DTC P0740 or P0770 identifies a TCC solenoid malfunction. Check for blown fuses and repair short(s) to ground if necessary. See appropriate wiring diagram in WIRING DIAGRAMS  to aid in component, wire color and terminal identification.
  1. Ensure ignition is off. Access Powertrain Control Module (PCM), located under left side of instrument panel, near kick panel. Disconnect PCM 22-pin harness connector (C2 on Geo or E34 on Suzuki).
  2. Turn ignition on. Using a voltmeter, measure voltage between ground and PCM harness connector C2 or E34, terminal No. 16 (White/Yellow wire). If battery voltage is present, go to next step. If battery voltage is not present, check the TCC relay. Refer to TORQUE CONVERTER CLUTCH (TCC) RELAY . Replace if necessary. If relay is okay, go to step 4).
  3. Start engine and allow it to reach normal operating temperature. Raise and support vehicle to allow rear wheels to spin freely. Shift selector lever to "D" position and accelerate. If voltage reading decreases to 0-1 volt at about 47 MPH, check TCC relay. See TORQUE CONVERTER CLUTCH (TCC) RELAY . Replace if necessary. If relay is okay, go to step 6). If voltage reading is not as specified, go to step 5).
  4. Check for poor TCC relay harness connection. Check White/Yellow wire between TCC relay and PCM for an open or short to ground. Check Blue/Black wire between TCC relay and main relay for an open or short to ground. Repair as necessary. If no problems are found, substitute a known-good PCM and retest system.
  5. Check for poor harness connections at PCM. Repair as necessary. If no problems are found, substitute a known-good PCM and retest system.
  6. Turn ignition off. Disconnect TCC relay. Turn ignition on. Using a voltmeter, measure voltage between ground and TCC relay harness connector terminal No. 2 (Black/White wire). If reading is battery voltage, go to next step. If reading is not as specified, repair open in Black/White wire.
  7. Check TCC solenoid. See TORQUE CONVERTER CLUTCH (TCC) SOLENOID . Replace if necessary. If solenoid is okay, go to next step.
  8. Check White wire between TCC relay and TCC solenoid for an open or poor connection. Repair as necessary. If no problem is found, check for low fluid pressure, misadjusted kick-down cable or other internal transmission problems.
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