Dtc P0486: Exhaust Gas Recirculation Sensor "B" Circuit Malfunction - Suzuki GRAND VITARA 2005 Service Manual

1A-58 Engine General Information and Diagnosis:

DTC P0486: Exhaust Gas Recirculation Sensor "B" Circuit Malfunction

CAUTION
!
• This fault can result in a rapid and significant fouling of the diesel particulate filter. If the EGR needs
to be replaced to deal with the fault, it must be cleared.
• This fault may appear if the wiring harness has been damaged.
Follow the procedure described in "Electrical Circuit Inspection Procedure: in Section 00 in related
manual".
• This check enables the condition and the conformity of the engine wiring harness to be checked.
NOTE
• Conditions for applying the fault finding procedure to stored faults:
The fault is declared present after the engine is started or following a road test.
• If the fault is present:
– There is smoke at the exhaust.
– The EGR offset fault finding function is deactivated.
– The Malfunction indicator light (MIL) will come on after three consecutive driving cycles (starting
+5 seconds + turn OFF ignition switch and wait 40 seconds.).
• Use service wire for all operations on the ECM connectors.
• Priorities when dealing with a number of faults:
Apply the procedure for dealing with fault "DTC P0651: Sensor Reference Voltage "B" Circuit / Open
Malfunction: " first if it is present or stored.
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
CO.0
CC.1
1.DEF
Troubleshooting for CO.0: Open circuit or short circuit to vehicle body ground
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 position feedback potentiometer between "C10-1" and "C10-2"
terminals.
If the resistance displayed is not approximately 5.9 – 7.1 Ω at 20 °C, 68 °F, replace the EGR valve.
Check the continuity and insulation from vehicle body ground of the following connections:
• Between "C10-3" wire of EGR valve connector and "C86-20" terminal of ECM connector
• Between "C10-1" wire of EGR valve connector and "C86-43" terminal of ECM connector
Repair if necessary.
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.
Detecting condition
Open circuit or short circuit to vehicle body ground
Short circuit to +12 V
Micro-breaks
S5JB0B1104115