2007 Chevrolet Optra5 LS, AutomaticFACTORY OEM SERVICE PROCEDURE

Conditions for Clearing the DTC

  • A current DTC Last Test Failed clears when the diagnostic runs and passes.
  • A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.
  • Clear the DTC with a scan tool.
Step Action Values Yes No
Schematic References: Starting and Charging Schematics 
Connector End View References: Engine Electrical Connector End Views 
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
2
  1. Start the engine.
  2. Raise the engine speed above 1,500 RPM.
  3. With a scan tool, observe the Ignition 1 voltage parameter in the engine control module (ECM) data list.
Is the voltage more than the specified value?		 10.5 V Go to Step 3  Go to Step 4 
3
  1. Observe the Freeze Frame/Failure Records data for this DTC.
  2. Turn OFF the ignition for 30 seconds.
  3. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
Did the DTC fail this ignition?		 - Go to Step 4  Go to Testing for Intermittent Conditions and Poor Connections
4
  1. Measure the voltage at the battery with a DMM.
  2. Raise the engine speed above 1,500 RPM.
  3. Compare the voltage at the battery to the Ignition 1 voltage parameter in the ECM data list.
Is the battery voltage and Ignition 1 parameter readings different by more than the specified value?		 0.5 V Go to Step 5  Go to Charging System Test 
5 Test the ignition 1 voltage circuit of the ECM for high resistance. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 8  Go to Step 6 
6 Test for an intermittent or poor connection at the harness connector of the ECM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 - Go to Step 8  Go to Step 7 
7 Replace the ECM.
Did you complete the replacement?		 - Go to Step 8  -
8
  1. Clear the DTCs with a scan tool.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
Did the DTC fail this ignition?		 - Go to Step 2  Go to Step 9 
9 Observe the Capture Info with a scan tool.
Are there any DTCs that have not been diagnosed?		 - Go to Diagnostic Trouble Code (DTC) List - Vehicle System OK
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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