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Home >> Suzuki >> 2006 >> Verona Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTC P0221 Through P0459 >> DTC P0400: Exhaust Gas Recirculation (EGR) Flow Incorrect >> DTC Troubleshooting

DTC Troubleshooting

DTC TROUBLESHOOTING CHART

Step Action Value (s) Yes No
1 Did you perform the On-Board Diagnostic (OBD II) System Check ? - Go to Step 2. Go to On-Board Diagnostic (OBD II) System Check .
2
  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 Setting 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 3. Go to Intermittents .
3 Is DTC P0106, P0107 or P0108 also ignition? - Go to applicable DTC Table . 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 Replace the EGR valve.
  1. Clear the DTC(s) with a scan tool.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Setting the DTC.

Is DTC P0400, P0401 or P0402 detected this ignition?		 - Go to Step 8. Go to Step 10.
8 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

Did you find and correct the condition?		 - Go to Step 9. Go to Intermittents .
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 Setting 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 10.
10 Check if any additional DTCs are set.
Are any DTCs displayed that have not been diagnosed?		 - Go to applicable DTC Table . System OK
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