Suzuki Grand Vitara JB416 / JB420 / JB419. Manual — part 87

1A-295 Engine General Information and Diagnosis: For Diesel Engine Model

Troubleshooting for D2: Measured pressure too low, D3: Measured pressure too high, D4: Insufficient
pressure, D5: Pressure < minimum and D6: Pressure > maximum

Check the fuel flow actuator connector.
Check the ECM connections.
Check the low pressure circuit and that the correct fuel is being used using fault finding
• Tests Test 2 referring to “Test 2: Low pressure circuit check: For Diesel Engine Model”.
Repair if necessary.
Measure the fuel flow actuator resistance between “C83-2” wire and “C83-1” wire.
If the resistance is not 2.9 – 3.1

Ω at 20 °C, 68 °F, replace the fuel flow actuator.

Check the continuity and for the absence of interference resistance on the following connections:
• Between “C83-2” wire of fuel flow actuator connector and “C86-7” terminal of ECM connector
• Between “C83-1” wire of fuel flow actuator connector and “E33-6” wire of main relay mounting connector
Repair if necessary.
• In the event of rail overpressure:

Check the operation of the injectors referring to “Test 8: Injector malfunction: For Diesel Engine Model”.
Check that the fuel pressure sensor is operating correctly using command “IMV/Flow actuator” on SUZUKI
scan tool.
Display the parameter “Fuel pressure” on Data List of SUZUKI scan tool, and refer to “SUZUKI Scan Tool
Data” to check the operating values.
If these checks do not reveal any faults, and if the fault is still present, replace the fuel pressure sensor.

• In the event of rail underpressure:

Check that the fuel pressure sensor is operating correctly using command “IMV/Flow actuator” on SUZUKI
scan tool.
Display the parameter “Fuel pressure” on Data List of SUZUKI scan tool, and refer to “SUZUKI Scan Tool
Data” to check the operating values.
Check the priming of the low pressure fuel circuit.
Check the conformity of the fuel filter connections.
Check the condition of the fuel filter (clogging and water saturation).
Check that there are no air bubbles between the fuel filter and the high pressure pump.
Check the low and high pressure fuel circuit sealing (visual checks, odour, etc.): pump casing, pressure relief
valve, pipes, rail and fuel injector unions, fuel injector wells, etc.
Check the conformity of the seal fitting on the fuel flow actuator.
Check the operation of the injectors referring to “Test 8: Injector malfunction: For Diesel Engine Model”.
Carry out the necessary operations.

If the fault is still present replace the fuel flow actuator.

Engine General Information and Diagnosis: For Diesel Engine Model 1A-296

DTC P0100: Mass or Volume Air Flow Circuit

S6JB0A1124092

NOTE

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

The fault is declared present after a road test.

• If the fault is present, the Injection warning light (gravity 1 warning light) is lit.
• Use service wire for all operations on the ECM connectors.
• Priorities when dealing with a number of faults:

As a priority, deal with fault “DTC P0697: Sensor Reference Voltage 3 Circuit: For Diesel Engine
Model” if the fault 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 CC1: Short circuit to +12 V

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

Displaying on SUZUKI scan tool

Detecting condition

CC1

Short circuit to +12 V

CO0

Open circuit or short circuit to vehicle body ground

D1

Offset at maximum threshold

D2

Offset at minimum threshold

Check the MAF sensor assembly with IAT sensor connections.
Check the ECM connections.
Repair if necessary.
Check the continuity and the insulation against +12 V of the following connections:
• Between “C13-2” wire of MAF sensor assembly with IAT sensor connector and “C86-24” terminal of ECM

connector

• Between “C13-6” wire of MAF sensor assembly with IAT sensor connector and “C86-12” terminal of ECM

connector

• Between “C13-5” wire of MAF sensor assembly with IAT sensor connector and “C86-47” terminal of ECM

connector

If the fault is still present, replace the MAF sensor assembly with IAT sensor.

Check there is a +5 V supply on “C13-5” wire of the MAF sensor assembly with IAT sensor connector.
Repair if necessary.
Check the MAF sensor assembly with IAT sensor connections.
Check the ECM connections.
Repair if necessary.
Check the continuity and insulation from vehicle body ground between:
• Between “C13-2” wire of MAF sensor assembly with IAT sensor connector and “C86-24” terminal of ECM

connector

• Between “C13-5” wire of MAF sensor assembly with IAT sensor connector and “C86-47” terminal of ECM

connector

• Between “C13-6” wire of MAF sensor assembly with IAT sensor connector and “C86-12” terminal of ECM

connector

• Between “C13-4” wire of MAF sensor assembly with IAT sensor connector and “E33-6” terminal of main

mounting connector

Repair if necessary.
If the fault is still present and remains present, replace the MAF sensor assembly with IAT sensor.

1A-297 Engine General Information and Diagnosis: For Diesel Engine Model

Troubleshooting for D1: Offset at maximum threshold and D2: Offset at minimum threshold

NOTE
Conditions for applying fault finding procedures to stored faults: The fault is declared present after
ignition switch has been turned OFF for 40 seconds.

Check the MAF sensor assembly with IAT sensor connections.
Check the ECM connections.
Repair if necessary
Check the following connections for continuity and make sure there is no interference resistance:
• Between “C13-5” wire of MAF sensor assembly with IAT sensor connector and “C86-47” terminal of ECM

connector

• Between “C13-6” wire of MAF sensor assembly with IAT sensor connector and “C86-12” terminal of ECM

connector

• Between “C13-2” wire of MAF sensor assembly with IAT sensor connector and “C86-24” terminal of ECM

connector

• Between “C13-4” wire of MAF sensor assembly with IAT sensor connector and “E33-6” terminal of main relay

mounting connector

Repair if necessary.
If the fault is still present, apply fault finding-Tests Test 3 referring to “Test 3: Checking the turbocharged air inlet
circuit: For Diesel Engine Model” and Test 4 referring to “Test 4: MAF sensor: For Diesel Engine Model”.
• Check that the inlet throttle valve is open
• With the MAF sensor assembly with IAT sensor connected, turn ON ignition switch and engine stopped:
• Check the voltage between “C13-2” and “C13-6” wires of the MAF sensor assembly with IAT sensor

connector:

If the value is not 0.5 – 0.7 V, replace the MAF sensor assembly with IAT sensor.
Check the EGR valve is not jammed open:
• Deal with any faults.
• Apply fault finding-Tests Test 7 referring to “Test 7: Exhaust gas recirculation valve: For Diesel Engine Model”.
If these checks show that the valve is jammed or irrevocably seized, replace the EGR valve.
If no faults are revealed, but the fault is still present, replace the MAF sensor assembly with IAT sensor

Engine General Information and Diagnosis: For Diesel Engine Model 1A-298

DTC P0105: Barometric Pressure Circuit

S6JB0A1124093

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

• The barometric pressure sensor is built into the ECM, and cannot be separated.

If the fault is present:
– There is light smoke at the exhaust.
– The atmospheric pressure value changes to safe mode, “Barometric Pres” on Data List of SUZUKI

scan tool = 1000 hPa.

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

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

Detecting Condition

Troubleshooting

DTC P0110: IAT Sensor Circuit Malfunction

S6JB0A1124094

NOTE

• Conditions for applying fault finding procedures to stored faults:

The fault is declared present after an attempted start, or with the engine running.

• If the fault is present:

– The air temperature value changes to safe mode, “Intake Air Temp” on Data List of SUZUKI scan

tool = 45.1

°C, 113.2 °F.

– The EGR function is inhibited.

• 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

Detecting condition

D1

Signal outside upper limit

D2

Signal outside lower limit

D3

Inconsistent signal

Disconnect the ECM and check the condition of its contacts and connector.
Repair if necessary.
Display the value of parameter “Turbo Pressure” on Data List of SUZUKI scan tool.
If this value is stuck at 1000 hPa, refer to interpretation of fault “DTC P0235: Boost Pressure Sensor Circuit: For
Diesel Engine Model”.
If the fault is still present, substitute a known-good ECM and recheck.

Displaying on SUZUKI scan tool

Detecting condition

CC0

Short circuit to vehicle body ground

CO1

Open circuit or short circuit to +12 V