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Home >> Kia >> 2001 >> Sephia Base, Automatic >> Repair and Diagnosis (Single Page) >> Transmission >> Automatic Trans >> Diagnosis - Fa4AEL >> Diagnostic Tests >> DTC P0748: Linear Solenoid Electrical Failure >> Diagnostic Procedure

Diagnostic Procedure

  1. Ensure all appropriate connections are clean and tight. Repair as needed. If connections are okay, go to next step.
  2. Access TCM connector. DO NOT disconnect connector. Using DVOM, measure voltage by backprobing between TCM harness connector terminal No. 5 and ground. See Figure. Voltage should be 4.8 volts with engine at idle, and zero voltage with engine stopped and ignition switch in ON position. If voltage is as specified, go to step  6. If voltage is not as specified, go to next step.
  3. Turn ignition switch to OFF position. Disconnect negative battery cable. Disconnect TCM harness connector. Using DVOM, measure resistance between ground and TCM harness connector terminal No. 5. If resistance is 4.1-5.1 ohms, go to step  6. If resistance is not 4.1-5.1 ohms, go to next step.
  4. Disconnect transaxle 9-pin connector. Using DVOM, measure resistance between transaxle connector terminal No. 3 and ground. See Figure. If resistance is 4.1-5.1 ohms, go to next step. If resistance is not 4.1-5.1 ohms, replace pressure control solenoid valve. See PRESSURE CONTROL, TCC & SHIFT SOLENOIDS  under REMOVAL & INSTALLATION.
  5. Ensure wiring between TCM and pressure control solenoid valve is okay. Repair as needed. If wiring is okay, go to next step.
  6. Reconnect all harness connectors. Clear DTC. Road test vehicle. Retrieve DTC. If DTC P0748 is still present, replace TCM. See TRANSAXLE CONTROL MODULE  under REMOVAL & INSTALLATION. If DTC P0748 is no longer present, malfunction is repaired.
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