Dtc P0403: Exhaust Gas Recirculation Control Circuit Malfunction - Suzuki GRAND VITARA 2005 Service Manual

Troubleshooting for 1.DEF: Internal electronic fault
Check the glow plug control module connections and the glow plug supply cables.
Check the ECM connections.
Repair if necessary.
Check the condition of the 80A fuse on the battery fuse box.
Check the continuity and insulation against vehicle body ground of the following connection:
• Between "C74-3" wire of glow plug control module connector and "C85-1" terminal of ECM connector
• Between "C74-1" wire of glow plug control module connector and "C85-17" terminal of ECM connector
Repair if necessary.
If the fault is still present, replace the glow plug control module.

DTC P0403: Exhaust Gas Recirculation Control Circuit Malfunction

NOTE
• Conditions for applying the fault finding procedure to stored faults:
The fault is declared present after a road test.
• The EGR function is deactivated if several faults with "DTC P0638: Throttle Actuator Control Range /
Performance Malfunction: " are present.
• If 1.DEF is present,
– The Injection warning light (gravity 1 warning light) is lit.
– The vehicle performances are reduced.
– There is smoke at the exhaust.
• Use service wire for all operations on the ECM connectors.
Wiring Diagram
For wiring circuit and connector number, refer to "A-5 Engine and A/C Control System Circuit Diagram (DSL): in
Section 9A".
Detecting Condition
Displaying on SUZUKI scan tool
1.DEF
1.DEF
Troubleshooting
CAUTION
!
EGR valve data initialization procedure is required when the EGR valve is replaced.
The "EGR valve initial offset" and "EGR valve last offset" parameters must be reinitialised.
Refer to "EGR Valve Data Initialization: in Section 1C" to carry out this programming.
Check the EGR valve connections.
Check the ECM connections.
Repair if necessary.
Measure the resistance of the EGR valve motor between "C10-4" and "C10-6" terminals.
If the resistance displayed is not approximately 2.66 – 3.26 Ω at 20 °C, 68 °F, replace the EGR valve.
Check the following connections for continuity and make sure there is no interference resistance:
• Between "C10-4" wire of EGR valve connector and "C86-26" terminal of ECM connector
• Between "C10-6" wire of EGR valve connector and "C86-25" terminal of ECM connector
Check there are no leaks on the EGR circuit: pipe pierced or damaged and that clamps are properly tightened.
Check the operation of the EGR valve:
Perform "Initialize EGR valve data" on SUZUKI scan tool to reinitialise the operating values of the valve and
launch a programming procedure for the EGR offsets (Refer to "EGR Valve Data Initialization: in Section 1C").
If the valve is jammed or irrevocably seized, replace the EGR valve.
Engine General Information and Diagnosis:
Detecting condition
Valve stuck open
Valve stuck closed
1A-53
S5JB0B1104112