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Suzuki Grand Vitara JB419. Manual - part 20

Engine General Information and Diagnosis: 1A-57

DTC P0486: Exhaust Gas Recirculation Sensor “B” Circuit Malfunction

S5JB0B1104115

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

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.

Displaying on SUZUKI scan tool

Detecting condition

CO.0

Open circuit or short circuit to vehicle body ground

CC.1

Short circuit to +12 V

1.DEF

Micro-breaks

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.

1A-58 Engine General Information and Diagnosis:

Troubleshooting for CC.1: Short circuit to +12 V and 1.DEF: Micro-breaks

CAUTION

DTC P0500: Vehicle Speed Sensor “A” Malfunction

S5JB0B1104116

NOTE

• Conditions for applying the fault finding procedure to stored faults:

The fault is declared present during a road test.

• Use service wire for all operations on the ECM connectors.

Detecting Condition

Troubleshooting

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 k

Ω at 20 °C, 68 °F, replace the EGR valve.

Check for continuity and insulation from +12 V on the following connections:
• Between “C10-3” wire of EGR valve connector and “C86-20” terminal of ECM connector
• Between “C10-2” wire of EGR valve connector and “C85-15” terminal of ECM connector
• Between “C10-1” wire of EGR valve connector and “C86-43” terminal of ECM connector
Repair if necessary.
Ensure the presence of +5 V on “C10-1”terminal of the EGR valve.
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.

Displaying on SUZUKI scan tool

Detecting condition

1.DEF

Inconsistency of signal

2.DEF

Signal outside upper limit

3.DEF

Configuration absent or incorrect

4.DEF

CAN connection fault

Check the ABS or ESP

® control module connections.

Check the ECM connections.
Repair if necessary.
Check ABS control module assembly or ESP

® control module assembly for DTC referring to “DTC Check in

Section 4E” or “DTC Check in Section 4F”.
Repair if necessary.
If the fault is still present, substitute a known-good ECM and recheck.

Engine General Information and Diagnosis: 1A-59

DTC P0530: A/C Refrigerant Pressure Sensor “A” Circuit Malfunction

S5JB0B1104117

NOTE

• For vehicle not equipped with A/C system, it is not abnormal even if the DTC is detected.
• Conditions for applying fault finding procedures to stored faults:

The fault is declared present following a road test, or if the air conditioning is switched ON.

• If the fault is present, air conditioning is not authorized.
• 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

Troubleshooting for CC.1: Short circuit to +12 V

Troubleshooting for CO.0: Open circuit or short circuit to vehicle body ground

Displaying on SUZUKI scan tool

Detecting condition

CC.1

Short circuit to +12 V

CO.0

Open circuit or short circuit to vehicle body ground

Check the A/C refrigerant pressure sensor connectors.
Check the ECM connections.
Repair if necessary.
Connect an air conditioning filling station (equipped with a high pressure gauge) to the vehicle.
Display parameter “REFRIGERANT PRESSURE” on HVAC control module with SUZUKI scan tool and compare
the value displayed by the filling station.
If the values match, carry out a fault finding procedure as described in the fault finding note for that vehicle.
If the values do not match, check the continuity and insulation against +12 V of the following connections:
• Between “E04- 3" wire of A/C refrigerant pressure sensor connector and “C86-13” terminal of ECM connector
• Between “E04-1” wire of A/C refrigerant pressure sensor connector and “C86-33” terminal of ECM connector
• Between “E04-2” wire of A/C refrigerant pressure sensor connector and “C85-9” terminal of ECM connector
Repair if necessary.
If the fault is still present, replace the A/C refrigerant pressure sensor

Check the A/C refrigerant pressure sensor connector.
Check the ECM connections.
Repair if necessary.
Connect an air conditioning filling station (equipped with a high pressure gauge) to the vehicle.
Display parameter “REFRIGERANT PRESSURE” on HVAC control module with SUZUKI scan tool and compare
the value displayed by the filling station.
If the values match, carry out a fault finding procedure as described in the fault finding note for that vehicle.
If the values do not match, check the continuity and insulation against vehicle body ground of the following
connections:
• Between “E04-3” wire of A/C refrigerant pressure sensor connector and “C86-13” terminal of ECM connector
• Between “E04-1” wire of A/C refrigerant pressure sensor connector and “C86-33” terminal of ECM connector
Repair if necessary.
If the fault is still present, replace the A/C refrigerant pressure sensor.

1A-60 Engine General Information and Diagnosis:

DTC P0544: Exhaust Gas Temperature Sensor Circuit Malfunction

S5JB0B1104118

NOTE

• Conditions for applying fault finding procedures to stored faults:

The fault is declared present after the engine is started or following a road test.

• If the fault is present, diesel particulate filter regenerations are not possible.

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

Troubleshooting

Displaying on SUZUKI scan tool

Detecting condition

CO.1

Open circuit or short circuit to +12 V

CC.0

Short circuit to vehicle body ground

Check for the continuity, absence of interference resistance and insulation from +12 V for the following
connections:
• Between “C88-1” wire of exhaust gas temperature sensor 3 connector and “C86-29” terminal of ECM

connector

• Between “C88-2” wire of exhaust gas temperature sensor 3 connector and “C85-11” terminal of ECM

connector

Repair if necessary.
Check the continuity, absence of interference resistance and insulation from vehicle body ground of the following
connection:
• Between “C88-1” wire of exhaust gas temperature sensor 3 connector and “C86-29” terminal of ECM

connector

Repair if necessary.
Check for the presence of ground on “C88-2” wire of the exhaust gas temperature sensor 3 connector.
Check the sensor resistance between “C88-1” and “C88-2” terminals of the exhaust gas temperature sensor 3
connector according to parameter “Diesel PF out Temp” on Data list of SUZUKI scan tool.

Exhaust gas temperature sensor resistance:
132500

Ω at 250 °C, 482 °F

52560

Ω at 300 °C, 572 °F

3529

Ω at 500 °C, 932 °F

1378

Ω at 600 °C, 1112 °F

If the recorded values do not correspond to the above values, replace the exhaust gas temperature sensor 3.
If the fault is still present, substitute a known-good ECM and recheck.

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