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HOMESERVICE MANUALSCHEVROLET2005OPTRA5 BASE, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - 1.6L (L91) - DTC P1403 TO DTC P1661DTC P1476TEST DESCRIPTION
2005 Chevrolet Optra5 Base, Standard

Test Description

2005 Chevrolet Optra5 Base, StandardSECTION Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. 2:  A click should be heard or felt when the valve operates. Ensure that both the ON and the OFF states are commanded. Repeat the commands as necessary.
  2. 4:  This step verifies that the ECM is providing ground to the EGR solenoid.
Step Action Yes No
Schematic Reference:  Engine Controls Schematics 
Connector End View Reference:  Engine Control Module (ECM) Connector End Views  or  Engine Controls Connector End Views 
1 Did you perform the Diagnostic System Check - Engine Controls? Go to Step 2  Go to Diagnostic System Check - Engine Controls
2 
  1. Turn ON the ignition, with the engine OFF.
  2. With the scan tool, command the EGR solenoid ON and OFF.
Do you hear or feel a click from the EGR solenoid when the valve is commanded ON and OFF?		 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.
Did the DTC fail this ignition?		 Go to Step 4  Go to Intermittent Conditions
4 
  1. Disconnect the EGR solenoid electrical connector.
  2. Connect a test lamp between the control circuit of the EGR solenoid and the ignition 1 voltage circuit of the EGR solenoid.
  3. With a scan tool, command the EGR solenoid ON and OFF.
Does the test lamp turn ON and OFF with each command?		 Go to Step 6  Go to Step 5 
5 Test the control circuit of the EGR solenoid for a short to voltage. Refer to Testing for a Short to Voltage and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 10  Go to Step 7 
6 Test for shorted terminals and for a poor connection at the EGR solenoid. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 10  Go to Step 8 
7 Test for shorted terminals and for a poor connection at the ECM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 10  Go to Step 9 
8 Replace the EGR solenoid.
Did you complete the replacement?		 Go to Step 10  -
9 Replace the ECM. Refer to Engine Control Module (ECM) Replacement .
Did you complete the replacement?		 Go to Step 10  -
10
  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.
Did the DTC fail this ignition?		 Go to Step 2  Go to Step 11 
11 Are there any DTCs that have not been diagnosed? Go to Diagnostic Trouble Code (DTC) List System OK
RENDER: 1.0x

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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.