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Suzuki Grand Vitara JB416 / JB420 / JB419. Manual - part 90

1A-307 Engine General Information and Diagnosis: For Diesel Engine Model

DTC P0225: APP Sensor (Main) Circuit

S6JB0A1124101

CAUTION

• 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 a series of full load/no load actions on the accelerator pedal.

• Turbocharging, passenger compartment heating resistor activation and cruise control/ speed limiter

are not authorised.
If CO0, CC1 or D1 is present the Injection warning light (gravity 1 warning light) is lit.

• The engine speed is fixed at 1400 rpm if there is a fault on main and sub of the accelerator pedal

position (APP) sensor and the engine torque is limited.

• Use service wire for all operations on the controller connectors.
• Priorities when dealing with a number of faults:

– Deal with fault “DTC P0641: Sensor Reference Voltage 1 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

NOTE
Priorities when dealing with a number of faults:
• If fault “DTC P2120: APP Sensor (Sub) Circuit: For Diesel Engine Model” is present at the same time,

check that the accelerator pedal position (APP) sensor assembly connector is connected correctly.

Displaying on SUZUKI scan tool

Detecting condition

CO0

Open circuit or short circuit to vehicle body ground

CC1

Short circuit to +12 V

Inconsistency of signal

Accelerator pedal position (APP) sensor locked

Check the connections of the accelerator pedal position (APP) sensor.
Check the ECM connections.
Repair if necessary.
Check the continuity and insulation from vehicle body ground of the following connections:
• Between “E68-3” wire of accelerator pedal position (APP) sensor connector and “E66-3” terminal of ECM

connector

• Between “E68-2” wire of accelerator pedal position (APP) sensor connector and “E66-4” terminal of ECM

connector

Repair if necessary.
Measure the resistance on the accelerator pedal position (APP) sensor (main) on accelerator pedal position
(APP) sensor assembly between “E68-4” and “E68-2”.
Replace the accelerator pedal position (APP) sensor assembly if the resistance is not approximately 0.8 – 2.6
k

Ω.

Engine General Information and Diagnosis: For Diesel Engine Model 1A-308

Troubleshooting for CC1: Short circuit to +12 V

Troubleshooting for D1: Inconsistency of signal

Troubleshooting for D2: Accelerator pedal position (APP) sensor locked

Check the connections of the accelerator pedal position (APP) sensor.
Check the ECM connections.
Repair if necessary.
Check for continuity and insulation from the +12 V feed on the following connections:
• Between “E68-3” wire of accelerator pedal position (APP) sensor connector and “E66-3” terminal of ECM

connector

• Between “E68-2” wire of accelerator pedal position (APP) sensor connector and “E66-4” terminal of ECM

connector

• Between “E68-4” wire of accelerator pedal position (APP) sensor connector and “E66-5” terminal of ECM

connector

Ω.

Check the connections of the accelerator pedal position (APP) sensor.
Check the ECM connections.
Repair if necessary.
Check the following connections for continuity and make sure there is no interference resistance:
• Between “E68-3” wire of accelerator pedal position (APP) sensor connector and “E66-3” terminal of ECM

connector

• Between “E68-2” wire of accelerator pedal position (APP) sensor connector and “E66-4” terminal of ECM

connector

• Between “E68-4” wire of accelerator pedal position (APP) sensor connector and “E66-5” terminal of ECM

connector

• Between “E68-6” wire of accelerator pedal position (APP) sensor connector and “E66-21” terminal of ECM

connector

• Between “E68-1” wire of accelerator pedal position (APP) sensor connector and “E66-15” terminal of ECM

connector

• Between “E68-5” wire of accelerator pedal position (APP) sensor connector and “E66-27” terminal of ECM

connector

If the fault is still present, replace the accelerator pedal position (APP) sensor assembly.

Check the mechanical status of the accelerator pedal:
• Locked in full load position.
• Pedal blocked by an external component.

Repair if necessary.
Vary the position of the pedal and display the parameter “Pedal position” on Data List of SUZUKI scan tool.
If the values displayed are inconsistent, replace the accelerator pedal position (APP) sensor assembly.

1A-309 Engine General Information and Diagnosis: For Diesel Engine Model

DTC P0235: Boost Pressure Sensor Circuit

S6JB0A1124102

CAUTION

This fault can result in a rapid and significant fouling of the diesel particulate filter.

NOTE

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

The fault is declared present:
– When an attempt is made to start the engine
– With the engine running

• Use service wire for all operations on the ECM connectors.
• If the fault is present:

– The EGR function is inhibited.
– The turbocharging pressure value changes to safe mode: “Turbo Pressure” on Data List of

SUZUKI scan tool = 1000 hPa.

– The Injection warning light (gravity 1 warning light) is lit.

• Order of priority in the event of more than one fault:

Deal with fault “DTC P0641: Sensor Reference Voltage 1 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

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

Inconsistency of signal

Check the boost pressure sensor connections.
Check the ECM connections.
Repair if necessary.
Check the continuity and insulation from vehicle body ground of the following connections:
• Between “C76-3” wire of boost pressure sensor connector and “C86-42” terminal of ECM connector
• Between “C76-74” wire of boost pressure sensor connector and “C86-19” terminal of ECM connector
Repair if necessary.
If the fault is still present, replace the boost pressure sensor.

Check the boost pressure sensor connections.
Check the ECM connections.
Repair if necessary.
Check the continuity and insulation against +12 volts of the following connections:
• Between “C76-3” wire of boost pressure sensor connector and “C86-42” terminal of ECM connector
• Between “C76-14” wire of boost pressure sensor connector and “C86-45” terminal of ECM connector
• Between “C76-4” wire of boost pressure sensor connector and “C86-19” terminal of ECM connector
Repair if necessary.
If the fault is still present, replace the boost pressure sensor.

Engine General Information and Diagnosis: For Diesel Engine Model 1A-310

Troubleshooting for D1: Inconsistency of signal

DTC P0243: Boost Pressure Malfunction

S6JB0A1124103

CAUTION

This fault can result in a rapid and significant fouling of the diesel particulate filter.

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:

– Turbocharging is no longer authorised.
– The EGR function is inhibited.
– The Injection warning light (gravity 1 warning light) is lit.

• Use service wire for all operations on the ECM connectors.
• Order of priority in the event of more than one fault:

– Firstly, deal with fault “DTC P1431: Clogged Diesel Particulate Filter Failures: For Diesel Engine

Model” if it is present or stored.

Detecting Condition

Troubleshooting for D1: Pressure too low

In the event of a number of faults with “DTC P0105: Barometric Pressure Circuit: For Diesel Engine Model”,
display parameter “Turbo Pressure” on Data List of SUZUKI scan tool.
If this value is locked at 1000 hPa and “Barometric Pres” on Data List of SUZUKI scan tool is displaying a
different value, replace the boost pressure sensor.
Check the boost pressure sensor connections.
Check the ECM connections.
Repair if necessary.
Check the following connections for continuity and make sure there is no interference resistance:
• Between “C76-3” wire of boost pressure sensor connector and “C86-42” terminal of ECM connector
• Between “C76-1” wire of boost pressure sensor connector and “C86-45” terminal of ECM connector
• Between “C76-4” wire of boost pressure sensor connector and “C86-19” terminal of ECM connector
Repair if necessary.
If the fault is still present, replace the boost pressure sensor.

Displaying on SUZUKI scan tool

Detecting condition

Pressure too low

Pressure too high

Check the boost pressure sensor connections.
Check the connections of the boost pressure control solenoid valve.
Check the ECM connections.
Repair if necessary.
Check the sealing of the high pressure air circuit:
• Disconnected or pierced pipes.
• Pressure sensor disconnected or poorly fitted (seal present).
• Intercooler pierced (to check the intercooler: with the vehicle stationary, stabiles the engine speed between

3500 to 4000 rpm and check there are no leaks).

Check the conformity of the turbocharging pressure signal and perform Test 5 and 6 of Fault Finding-Tests
referring to “Test 5: Variable geometry turbocharger control: For Diesel Engine Model” and “Test 6: Rotating part
of a turbocharger: For Diesel Engine Model”.

Content .. 88 89 90 91 ..