LaCrosse FWD V6-3.0L (2010)
‹› If less than the specified value, test the ignition control circuit for a short to ground or an open/high resistance. If the circuit/connection tests
normal, replace the K20 ECM.
‹› If greater than the specified value, test the ignition control circuit for a short to voltage. If the circuit/connection tests normal, replace the K20
ECM.
4. Ignition OFF, all vehicle systems OFF, this may take up to 2 min, test for less than 5 ohm between the low reference circuit terminal B or 3 and the
K20 ECM housing.
‹› If greater than the specified value, test for an open/high resistance in the low reference circuit. If the circuit/connection tests normal, replace
the K20 ECM.
5. Test for less than 5 ohm between the ground circuit terminal A or 4 and ground.
‹› If greater than the specified value, test for an open, or high resistance in the ground circuit.
6. Remove the T8 ignition coil from the engine. Connect the harness.
7. Remove the fuse for the fuel pump or the fuel pump control module, if equipped.
8. Crank the engine and test for strong spark using the EL 26792 - Tester.
‹› If no spark or weak spark is observed, replace the T8 ignition coil.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Computers and Control Systems/Testing and Inspection/Diagnostic Trouble Code Tests and
Associated Procedures/Verification Tests and Procedures) after completing the diagnostic procedure.
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Ignition Coil Replacement - Bank 1 (See: Service and Repair/Ignition Coil Replacement - Bank 1)
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Ignition Coil Replacement - Bank 2 (See: Service and Repair/Ignition Coil Replacement - Bank 2)
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Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup, and programming