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Home >> Suzuki >> 2006 >> Grand Vitara Premium, RWD, Standard >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine General Information And Diagnosis >> Diagnostic Information And Procedures >> DTC P0403: Exhaust Gas RECIRCULATION Control Circuit >> DTC Troubleshooting
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DTC Troubleshooting

DTC TROUBLESHOOTING CHART

Step Action YES NO
1  Was "Engine and Emission Control System Check" performed?  Go to Step 2. Go to ENGINE AND EMISSION CONTROL SYSTEM CHECK .
2  EGR valve power supply circuit check 
  1. With ignition switch OFF, disconnect connector from EGR valve.
  2. With ignition switch ON, check that EGR valve power supply circuit voltage between.
    • "a" terminal of EGR valve connector and vehicle body ground is battery voltage.
    • "b" terminal of EGR valve connector and vehicle body ground is battery voltage.
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Is it in good condition? 		 Go to Step 3. EGR valve power supply circuit is open or shorted to ground.
3  Wiring harness check 
  1. Disconnect connectors from ECM with ignition switch turned OFF.
  2. Check for proper terminal connection to EGR valve and ECM connectors.
  3. If connections are OK, check that EGR valve control circuit is as follows.
    • Wiring harness resistance of all EGR valve control circuits are less than 3 Ω.
    • Insulation resistance between all EGR valve control circuits and vehicle body ground are infinity.

Are they in good condition? 		 Go to Step 4. Repair or replace defective wire harness.
4  EGR valve check 
  1. Check EGR valve for resistance referring to EGR VALVE ASSEMBLY INSPECTION .

Is it in good condition? 		 Substitute a known-good ECM and recheck. Replace EGR valve.
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