Suzuki Grand Vitara JB416 / JB420 / JB419. Manual — part 93

1A-319 Engine General Information and Diagnosis: For Diesel Engine Model

DTC P0470: Differential Sensor Circuit

S6JB0A1124114

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:

– The Injection warning light (gravity 1 warning light) is lit.
– The diagnostic of the diesel particulate filter is inhibited.
– Diesel particulate filter regenerations are inhibited.

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: Open circuit and CC1: Short circuit to +12 V

Troubleshooting for CO0: Open circuit or short circuit to vehicle body ground

Troubleshooting for D1: Inconsistency of signal and D2: Signal outside lower limit

Displaying on SUZUKI scan tool

Detecting condition

CO

Open circuit

CO0

Open circuit or short circuit to vehicle body ground

CC1

Short circuit to +12 V

D1

Inconsistency of signal

D2

Signal outside lower limit

Check the condition of the connectors on the differential pressure sensor and the ECM.
Repair if necessary.
Check the following connections for insulation, continuity and make sure there is no interference resistance:
• Between “C89-2” wire of differential pressure sensor connector and “C85-12” terminal of ECM connector
• Between “C89-3” wire of differential pressure sensor connector and “C85-14” terminal of ECM connector
• Between “C89-1” wire of differential pressure sensor connector and “C86-42” terminal of ECM connector
Repair if necessary.
Check for the presence of ground on “C89-2” of the differential pressure sensor connector.
Repair if necessary.
If the fault is still present, substitute a known-good ECM and recheck.

Check the continuity, the absence of interference resistance and the insulation from vehicle body ground of the
following connections:
• Between “C89-3” wire of differential pressure sensor connector and “C85-14” terminal of ECM connector
• Between “C89-1” wire of differential pressure sensor connector and “C86-42” terminal of ECM connector
Repair if necessary.
If the fault is still present, substitute a known-good ECM and recheck.

Check the condition of the pressure pipes on the differential pressure sensor.
Verify that they are sealed and check their position.
Replace if necessary.
Check the condition of the connectors on the differential pressure sensor and the ECM.
Repair if necessary.
Check the continuity and for the absence of interference resistance on the following connections:
• Between “C89-3” wire of differential pressure sensor connector and “C85-14” terminal of ECM connector
• Between “C89-1” wire of differential pressure sensor connector and “C86-42” terminal of ECM connector
Repair if necessary.
If the fault is still present, change the differential pressure sensor.

Engine General Information and Diagnosis: For Diesel Engine Model 1A-320

DTC P0480: Radiator Fan Low Control Circuit

S6JB0A1124150

NOTE

• Conditions for applying fault finding procedures to stored faults:

The fault is declared present after the engine is started.

• 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 CO0: Open circuit or short circuit to vehicle body ground

Troubleshooting for CC1: Short circuit to +12 V

Displaying on SUZUKI scan tool

Detecting condition

CO0

Open circuit or short circuit to vehicle body ground

CC1

Short circuit to +12 V

Check the condition of the radiator fan relay No.1 (Low).
Check the ECM connections.
Repair if necessary.
Check the radiator fan relay No.1 (Low) mounting connections.
If these checks are correct,
Check the continuity and insulation from vehicle body ground of the following connections:
• Between “E29-5” wire of radiator fan relay No.1 (Low) mounting connector and “C85-20” terminal of ECM

connector

• Between “E29-3” wire of radiator fan relay No.1 (Low) mounting connector and “E33-6” wire of main relay

connector

Repair if necessary.
If the fault is still present, substitute a known-good ECM and recheck.

Check the condition of the radiator fan relay No.1 (Low).
Check the ECM connections.
Repair if necessary.
Check the radiator fan relay No.1 (Low) mounting connections.
Check the continuity and insulation from +12 V of the following connection:
• Between “E29-5” wire of radiator fan relay No.1 (Low) mounting connector and “C85-20” terminal of ECM

connector

Repair if necessary.
If the fault is still present, substitute a known-good ECM and recheck.

1A-321 Engine General Information and Diagnosis: For Diesel Engine Model

DTC P0481: Radiator Fan High Control Circuit

S6JB0A1124151

NOTE

• Conditions for applying fault finding procedures to stored faults:

The fault is declared present after the engine is started.

• “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 CO0: Open circuit or short circuit to vehicle body ground

Troubleshooting for CC1: Short circuit to +12 V

Displaying on SUZUKI scan tool

Detecting condition

CO0

Open circuit or short circuit to vehicle body ground

CC1

Short circuit to +12 V

Check the condition of the radiator fan relay No.2 (High) and radiator fan relay No.3 (High).
Check the ECM connections.
Repair if necessary.
Check the radiator fan relay No.2 (High) and radiator fan relay No.3 (High) mounting connections.
If these checks are correct,
Check the continuity and insulation from vehicle body ground of the following connections:
• Between “E30-5” wire of radiator fan relay No.2 (High) mounting connector and “C85-18” terminal of ECM

connector

• Between “E30-3” wire of radiator fan relay No.2 (High) mounting connector and “E33-6” wire of main relay

connector

• Between “E31-5” wire of radiator fan relay No.3 (High) mounting connector and “C85-18” terminal of ECM

connector

• Between “E31-3” wire of radiator fan relay No.3 (High) mounting connector and “E33-6” wire of main relay

connector

Repair if necessary.
If the fault is still present, substitute a known-good ECM and recheck.

Check the condition of the radiator fan relay No.2 (High) and radiator fan relay No.3 (High).
Check the ECM connections.
Repair if necessary.
Check the radiator fan relay No.2 (High) and radiator fan relay No.3 (High) mounting connections.
Check the continuity and insulation from +12 V of the following connection:
• Between “E30-5” wire of radiator fan relay No.2 (High) mounting connector and “C85-18” terminal of ECM

connector

• Between “E31-5” wire of radiator fan relay No.3 (High) mounting connector and “C85-18” terminal of ECM

connector

Repair if necessary.
If the fault is still present, substitute a known-good ECM and recheck.

Engine General Information and Diagnosis: For Diesel Engine Model 1A-322

DTC P0486: EGR Stroke Sensor Circuit

S6JB0A1124115

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”.

• 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 2 Circuit: For
Diesel Engine Model” 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 CO0: 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: For Diesel Engine Model in Section 1C” to carry out this
programming.

Displaying on SUZUKI scan tool

Detecting condition

CO0

Open circuit or short circuit to vehicle body ground

CC1

Short circuit to +12 V

D1

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: For Diesel Engine
Model in Section 1C”).
If the valve is jammed or irrevocably seized, replace the EGR valve.