Bulletin No.: TSB-008-01
Model(s): All
Date: December 19, 2001
VIN Range: All
Description: TEC Test Procedure
Group: Engine
Reference: Scan 100 Operator Manual
Prod. Dates: All
Whenever an Engine Control Module (ECM), Powertrain Control Module (PCM) or battery is disconnected/replaced, the TEC Test Procedure (referred to as the "Crankshaft Position Variation Learning Procedure" in the Service Manual) must be performed using the Scan 100 Scan Tool. This procedure electronically aligns the Crankshaft Position (CKP) Sensor to the Camshaft Position (CMP) Sensor to correct for variations in Timing Belt length, camshaft and crankshaft pulleys, etc. Failure to perform the TEC Test procedure can cause poor driveability and a variety of Diagnostic Trouble Codes (DTCs) including P1336 - 58x Crank Tooth Not Learned to be stored in diagnostic memory along with Malfunction Indicator Light (MIL) illumination.
Whenever any component that may affect the relationship between the Camshaft Position (CMP) Sensor and the Crankshaft Position (CKP) Sensor is removed or replaced, the TEC Test Procedure must be performed. Items that may affect the "learned" alignment include the CMP Sensor, the CKP Sensor, the ECM/PCM, the Timing Belt, Cylinder Head, Short Block, Camshaft Pulley(s), Engine Assembly, etc.
A number of seemingly unrelated DTCs and/or driveability concerns have also resulted from vehicles where the TEC Test was not properly completed after battery disconnect/ replacement or ECM/PCM replacement. Various misfire DTCs, rough idle concerns, intermittent stalling, or reports of MIL flashing with no DTCs set are common. If you are diagnosing a vehicle with any of these concerns, please complete the TEC Test and re-check the vehicle before continuing with your diagnosis.
A new Engine Control Module (ECM) or Powertrain Control Module (PCM) is programmed with the latest version of the vehicle program for the specific model and does not need to be "Programmed" using the Scan 100 Scan Tool. However, it is still necessary to connect the Scan 100 Scan Tool to the vehicle to complete the installation process. After the ECM/PCM is properly installed and the battery reconnected, please perform the following procedure:
TEC Test Procedure:
Note: Before beginning the TEC Test Procedure, ensure that the engine temperature is above 149°F (65°C).
1. Connect the Scan 100 Scan Tool to the Data-Link Connector (DLC) and press the "Power" button.
2. From the Main Menu, choose "Reprogramming" (selection 6).
Note: The Scan 100 may indicate that the ABS Fuse (Lanos F-19, Nubira F-15) be removed on 1998-99 Lanos and Nubira models equipped with Delphi ABS.
3. Choose "Miscellaneous" (selection 3).
4. Replacement ECM/PCM Only - Choose "VIN Input" (selection 9). When indicated, enter "password" 0-0-0-0, then press "ESC" to go to the VIN Input screen. Scroll left-to-right to choose the character and scroll up-and-down to change each character. Press "ENTER" when the VIN is correct to save the VIN and return to the "Miscellaneous" screen.
5. Choose TEC Test (selection 8). Start the engine when prompted and press "ENTER" to continue. When prompted, with the shift selector in the "Park" position and holding the brake pedal down firmly with your left foot, depress the throttle fully and allow the engine to reach fuel cut at 4,000 rpm. Hold the throttle at this point (approximately 2-3 seconds) until the rpm begins to drop and "TEC Test Normal (Good)" is displayed, then release the throttle.
Note: The Scan 100 will only allow one (1) TEC Test to be completed per key cycle.
If you have any questions about this procedure or need additional information, please contact the Daewoo Technical Assistance Center toll free at (877) DMA-1234, selection 1.
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