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Home >> Chevrolet >> 2005 >> Aveo Base, 4D Hatchback >> Repair and Diagnosis >> External Pages >> Different car >> Section 20 (Automatic Transmission -- AISIN -- 81-40LE -- Diagnosis (DTC P0743 To DTC U2105)) >> Diagnosis >> DTC P1791 (Non Europe or N. American Emissions) >> Cause for Failure

Cause for Failure

WARNING: This page is about a different car, the 2004 Suzuki Swift + and 2004 Chevrolet Aveo. However, it is still accessible from the selected car via links, so may be relevant.
DTC P1791 (Non Europe or N. American Emissions)

Step Action Values Yes No
1
  1. Turn OFF the ignition.
  2. Install the scan tool.
  3. With the engine OFF, turn the ignition switch to the ON position.
  4. Select Store Freeze Frame/Failure Records from the Diagnostic Trouble Codes Information menu.
  5. Store Freeze Frame/Failure Records.
  6. Select Clear DTC Information from the Diagnostic Trouble Codes Information menu.
  7. Clear DTC Information.
  8. Perform 1 vehicle drive cycle.
Is the hold lamp ON?		 - Go to Step 2  Go to Step 6 
2
  1. Select Request DTC by Status from the Diagnostic Trouble Codes Information menu.
  2. Request DTC by Status.
Is DTC P1791 displayed?		 - Go to Step 3  Go to Step 6 
3
  1. Turn OFF the ignition.
  2. Disconnect the transmission control module (TCM) wiring connector and engine control module (ECM) wiring connector.
  3. Measure the resistance between terminal A17 of the TCM wiring connector and terminal K14, or B14, or 88 of the ECM wiring connector.
  4. Measure the resistance between terminal A7 of the TCM wiring connector and terminal K15, or B30, or 57 of the ECM wiring connector.
Is the resistance within the specified values?		 0 Ω Go to Step 4  Go to Step 5 
4
  1. Turn ON the ignition.
  2. Measure the voltage of terminal A17.
  3. Measure the voltage of terminal A7.
Is the voltage within the specified values?		 11-14 V Go to Step 5  Go to Step 7 
5 Repair the malfunctioning terminals as necessary.
Did you complete the repair?		 - System OK -
6 Repair the temporary connection failure of the connector. Refer to Transmission Control Module (TCM) Replacement .
Did you complete the repair?		 - System OK -
7
  1. Replace the TCM. Refer to Transmission Control Module (TCM) Replacement .
  2. Turn OFF the ignition.
  3. Turn ON the ignition.
  4. Check if DTC P1791 is set.
Is the DTC set?		 - Go to Step 8  Go to Step 9 
8 Replace the ECM. Refer to ENGINE CONTROL MODULE (ECM) REPLACEMENT
Did you complete the replacement?		 - Go to Step 9  -
9
  1. After the repair, use a scan tool clear info function and road test the vehicle.
  2. Review the DTC info.
Has the last test failed or is the current DTC displayed?		 - Go to Step 1  System OK
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