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HOMESERVICE MANUALSCHEVROLET2005OPTRA5 BASE, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - 1.6L (L91) - DTC P0336 TO DTC P1402DTC P1230TEST 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:  Listen for a click when the fuel pump relay operates. When the fuel pump relay is commanded On with the scan tool, the ECM pulses the fuel pump relay ON and OFF several times. Repeat the command as necessary.
  1. 4:  This step verifies that the ECM is providing a ground to the fuel pump relay.
  2. 5:  This step tests the Ignition 1 Voltage circuit of the fuel pump relay.
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. Command the fuel pump ON with a scan tool.
Does the fuel pump relay turn ON and OFF?		 Go to Step 3  Go to Step 4 
3
  1. Observe the Freeze Frame/Failure Records for this DTC.
  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 4  Go to Diagnostic Aids
4 
  1. Turn OFF the ignition.
  2. Disconnect the fuel pump relay.
  3. Turn ON the ignition, with the engine OFF.
  4. Probe the control circuit of the fuel pump relay with a test lamp connected to battery voltage.
  5. Command the fuel pump ON with a scan tool.
Does the test lamp pulse ON and OFF?		 Go to Step 5  Go to Step 6 
5 
  1. Connect a test lamp between the control circuit and the Ignition 1 Voltage circuit of the fuel pump relay.
  2. Command the fuel pump ON with a scan tool.
Does the test lamp pulse ON and OFF?		 Go to Step 7  Go to Step 9 
6 Test the control circuit of the fuel pump relay for one of the following conditions:
  • An open
  • A short to ground
  • High resistance

Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 Go to Step 12  Go to Step 8 
7 Test for an intermittent and for a poor connection at the fuel pump relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 Go to Step 12  Go to Step 10 
8 Test for an intermittent and for a poor connection at the engine control module (ECM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 Go to Step 12  Go to Step 11 
9
  1. Repair one of the following conditions in the ignition 1 voltage circuit of the fuel pump relay:
    • An open
    • High resistance
    • An intermittent short to ground. Refer to Wiring Repairs .
  2. Replace fuse as necessary.
Did you complete the repair?		 Go to Step 12  -
10 Replace the fuel pump relay.
Did you complete the replacement?		 Go to Step 12  -
11 Replace the ECM. Refer to Engine Control Module (ECM) Replacement .
Did you complete the replacement?		 Go to Step 12  -
12
  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 13 
13 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.