Suzuki Grand Vitara JB419. Manual - part 13

 

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Suzuki Grand Vitara JB419. Manual - part 13

 

 

Engine General Information and Diagnosis:  1A-29

Troubleshooting for 1.DEF: Internal electronic fault

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”.
Repair if necessary.
Measure the resistance of the fuel flow actuator between “C83-1” and “C83-2” terminals.
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.
Check the fuel pressure sensor using the interpretation of “DTC P0190: Fuel Rail Pressure Sensor Circuit 
Malfunction”.
Repair if necessary.
If the fault is still present, check that the ECM output stage is working correctly.
• Either using an ammeter:

With the regulator connected, connect the amperometric clamp to the connection to the fuel flow actuator 
“C83-1” terminal connection, observing the current direction.Clear any fuel pressure sensor faults and perform 
output test “IMV/Flow actuator” on SUZUKI scan tool.
The ammeter should display five cycles of two successive strengths: ~ 0.6 A then ~ 2 A

• Or using a voltmeter:

With the fuel flow actuator connected, connect the negative terminal of the voltmeter to “C83-2” wire of the 
fuel flow actuator connector and the positive terminal to “C83-1” wire. Clear any fuel flow actuator faults, then 
perform “IMV/Flow actuator” on SUZUKI scan tool:
The voltmeter should display two successive voltage readings:
~ 3.15 volts for an opening cyclic ratio of 25% then ~ 9.45 V for an opening cyclic ratio of 75% (five cycles)

• Or using an oscilloscope (at 5 V range/division and 1 ms/div time base):

With the fuel flow actuator connected, connect the negative terminal of the oscilloscope to the ground terminal 
at battery and the positive terminal to “C83-2” wire of the fuel flow actuator connector, clear any fuel flow 
actuator faults, then perform “IMV/Flow actuator” on SUZUKI scan tool:
The oscilloscope should display a square-wave signal of an amplitude of 12.5 V at a frequency of 185 Hz 
(with an opening cyclic ratio alternating from 25 to 75%).

If the measurement does not show any control or continuous voltage, substitute a known-good ECM and 
recheck.

1A-30 Engine General Information and Diagnosis: 

Troubleshooting for 2.DEF: Measured pressure too low, 3.DEF: Measured pressure too high, 4.DEF: 
Insufficient pressure, 5.DEF: Pressure < minimum, 6.DEF: Pressure > maximum and 7.DEF: Extensive pump 
command

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”.
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”.
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”.
Carry out the necessary operations.

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

Engine General Information and Diagnosis:  1A-31

DTC P0100: Mass or Volume Air Flow Circuit Malfunction

S5JB0B1104092

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 “C” Circuit / Open Malfunction” 
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 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

1.DEF

Offset at maximum threshold

2.DEF

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-32 Engine General Information and Diagnosis: 

Troubleshooting for 1.DEF: Offset at maximum threshold and 2.DEF: 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” and Test 4 referring to “Test 4: MAF sensor”.
• 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”.
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

 

 

 

 

 

 

 

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