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HOMESERVICE MANUALSCHEVROLET2005OPTRA5 BASE, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - 1.6L (L91) - DTC P0336 TO DTC P1402DTC P0400TEST 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. 3:  MAP sensor faults must be diagnosed first. A skewed MAP sensor reading could cause this DTC to set.
  2. 7:  An engine mechanical condition may cause the engine to operate poorly, which could cause a low vacuum condition.
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 OFF the ignition for 30 seconds.
  2. Start the engine.
  3. Operate the vehicle within the Conditions for Running the DTC.
Did the DTC fail this ignition?		 Go to Step 3  Go to Intermittent Conditions
3  Is DTC P0107 or P0108 also set? Go to Diagnostic Trouble Code (DTC) List Go to Step 4 
4 Inspect the exhaust gas recirculation (EGR) system for the following conditions:
  • Incorrect EGR valve for engine application.
  • A vacuum leak between the EGR valve and the intake manifold.
  • Signs of external leakage usually indicated by carbon buildup around the mating surfaces of the components or an audible exhaust noise.
  • Restrictions in the passages or EGR valve caused by carbon deposits or casting flash.

Did you find and correct the condition?		 Go to Step 9  Go to Step 5 
5 Inspect for leaks or restrictions at the manifold absolute pressure (MAP) sensor.
Did you find and correct the condition?		 Go to Step 9  Go to Step 6 
6 Inspect the exhaust system for the following conditions:
  • Leaks caused by damage to the exhaust components
  • Restrictions that can cause excessive back pressure and low engine vacuum-Restrictions may be caused by aftermarket equipment or damage to the exhaust components.
  • Modification of original equipment manufacture (OEM) parts

Did you find and correct the condition?		 Go to Step 9  Go to Step 7 
7 
  1. Inspect for the following engine mechanical conditions:
    • The correct installation of the timing belt
    • Worn piston rings
    • Worn camshaft
    • Other worn or damaged engine components
  2. Refer to Symptoms - Engine Mechanical .
Did you find and correct the condition?		 Go to Step 9  Go to Step 8 
8 Replace the EGR valve. Refer to Exhaust Gas Recirculation (EGR) Valve Replacement (Non European Emissions) or Exhaust Gas Recirculation (EGR) Valve Replacement (European and North American Emissions) .
Did you complete the replacement?		 Go to Step 9  -
9
  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 10 
10 Are there any DTCs that have not been diagnosed? Go to Diagnostic Trouble Code (DTC) List 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.