LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Suzuki >> 2005 >> Verona EX >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine General Information And Diagnosis >> Diagnostic Information and Procedures >> DTC P0404 Exhaust Gas Recirculation (EGR) Valve Failure >> DTC Troubleshooting
April 5, 2026: LEMON Manuals is launched! Read the announcement.

DTC Troubleshooting

DIAGNOSIS PROCEDURE - DTC P0404 EXHAUST GAS RECIRCULATION (EGR) VALVE FAILURE

Step Action Value(s) Yes No
1 Perform an On-Board Diagnostic (OBD) System Check.
Is the system check complete?		 - Go to Step 2. Go to "ON-BOARD DIAGNOSTIC (OBD II) SYSTEM CHECK ".
2
  1. Turn the ignition switch to LOCK.
  2. Disconnect the EGR solenoid connector.
  3. Connect a test light between the EGR connector terminal 2 and the battery positive.

Is the test light on?		 - Go to Step 4. Go to Step 3.
3
  1. Repair the wire or the connector terminal between the EGR connector terminal 2 and the ECM connector terminal 66 as needed.
  2. Using the scan tool, clear the Diagnostic Trouble Codes (DTCs).
  3. Perform an On-Board Diagnostic (OBD) System Check.

Is the repair complete?		 - System OK -
4
  1. Connect a test light between the EGR connector terminal 3 and the ECM connector terminal 11.
  2. Turn the ignition switch to ON.

Is the test light on?		 - Go to Step 6. Go to Step 5.
5
  1. Repair the wire or the connector terminal between the EGR connector terminal 3 and the ECM connector terminal 11 as needed.
  2. Using the scan tool, clear the Diagnostic Trouble Codes (DTCs).
  3. Perform an On-Board Diagnostic (OBD) System Check.

Is the repair complete?		 - System OK -
6
  1. Connect a test light between the EGR connector terminal 4 and the ECM connector terminal 49.
  2. Turn the ignition switch to ON.

Is the test light on?		 - Go to Step 8. Go to Step 7.
7
  1. Repair the wire or the connector terminal between the EGR connector terminal 4 and the ECM connector terminal 49 as needed.
  2. Using the scan tool, clear the Diagnostic Trouble Codes (DTCs).
  3. Perform an On-Board Diagnostic (OBD) System Check.

Is the repair complete?		 - System OK -
8
  1. Connect a test light between the EGR connector terminal 5 and the ECM connector terminal 60.
  2. Turn the ignition switch to ON.

Is the test light on?		 - Go to Step 10. Go to Step 9.
9
  1. Repair the wire or the connector terminal between the EGR connector terminal 5 and the ECM connector terminal 60 as needed.
  2. Using the scan tool, clear the Diagnostic Trouble Codes (DTCs).
  3. Perform an On-Board Diagnostic (OBD) System Check.

Is the repair complete?		 - System OK -
10 Measure the resistance of the EGR solenoid.
Is the resistance between the specified values?		 7.8 ~ 8.6 Ω Go to Step 2. Go to Step 11.
11
  1. Replace the EGR valve.
  2. Using the scan tool, clear the Diagnostic Trouble Codes (DTCs).
  3. Perform an On-Board Diagnostic (OBD) System Check.

Is the repair complete?		 - System OK -
12
  1. Turn the ignition switch to LOCK.
  2. Replace the ECM.
  3. Perform an On-Board Diagnostic (OBD) System Check.

Is the repair complete?		 - System OK -
scientia non olet · About LEMON Manuals