Suzuki Grand Vitara JB419. Manual - part 23

Engine General Information and Diagnosis: 1A-69

Troubleshooting for CC.0: Short circuit to vehicle body ground and CO: Open circuit

NOTE
After any inlet throttle valve procedures, it is necessary to perform “Initialize inlet throttle valve data”
on SUZUKI scan tool.
Inlet throttle valve fault adaptives. Then turn OFF ignition switch and wait 40 seconds.

Troubleshooting for CC: Short circuit

Check the connections of the inlet throttle valve.
Check the ECM connections.
Repair if necessary.
Check the continuity and insulation from vehicle body ground of the following connections:
• Between “C75-3” wire of inlet throttle valve connector and “C86-40” terminal of ECM connector
• Between “C75-2” wire of inlet throttle valve connector and “E33-6” wire of main relay mounting connector
• Between “C75-4” wire of inlet throttle valve connector and “C86-27” terminal of ECM connector
Repair if necessary.
If the fault persists, replace the inlet throttle valve.

Check the connections of the inlet throttle valve.
Check the ECM connections.
Repair if necessary.
Check the continuity, absence of interference resistance and insulation on the following connection:
• Between “C75-1” wire of inlet throttle valve connector and vehicle body ground
• Between “C75-2” wire of inlet throttle valve connector and “E33-6” wire of main relay mounting connector
• Between “C75-3” wire of inlet throttle valve connector and “C86-40” terminal of ECM connector
• Between “C75-4” wire of inlet throttle valve connector and “C86-27” terminal of ECM connector
Repair if necessary.
If the fault persists, replace the inlet throttle valve.

1A-70 Engine General Information and Diagnosis:

Troubleshooting for 1.DEF: Internal electronic fault, 2.DEF: External diagnostics and 3.DEF: Values out of
range

Check the connections of the inlet throttle valve.
Check the ECM connections.
Repair if necessary.
Check the continuity, absence of interference resistance and insulation on the following connection:
• Between “C75-1” wire of inlet throttle valve connector and vehicle body ground
• Between “C75-2” wire of inlet throttle valve connector and “E33-6” wire of main relay mounting connector
• Between “C75-3” wire of inlet throttle valve connector and “C86-40” terminal of ECM connector
• Between “C75-4” wire of inlet throttle valve connector and “C86-27” terminal of ECM connector
Repair if necessary.
• Perform “Initialize inlet throttle valve data” on SUZUKI scan tool.
• If the fault is still present, check that the ECM output stage is working correctly.
• Connected inlet throttle valve:

– Connect the negative terminal of the voltmeter to “C75-3” wire of the inlet throttle valve
– Connect the positive terminal of the voltmeter to “C75-2” wire of the inlet throttle valve
– Perform output test “Electronic Throttle Control” on SUZUKI scan tool:

The voltmeter should display five cycles of two successive voltages: ~ 3.15 V (Opening Cyclic Ratio of 25%)
then ~ 9.45V (Opening Cyclic Ratio of 75%).
If the voltmeter indicates above voltage, but inlet throttle valve does not operate, replace inlet throttle valve.
If the voltmeter does not indicate any control while the command is running (five cycles), substitute a known-
good ECM and recheck.

Engine General Information and Diagnosis: 1A-71

DTC P0641: Sensor Reference Voltage “A” Circuit / Open Malfunction

S5JB0B1104126

CAUTION

• 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 following a road test or after attempting to start the engine several
times.

• If the fault is present:

– The cruise control / speed limiter function is deactivated.
– Turbocharging is disabled.
– Engine speed is restricted.
– The Injection warning light (gravity 1 warning light) is lit.

• 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

1.DEF

Sensor reference voltage too low

2.DEF

Sensor reference voltage too high

1A-72 Engine General Information and Diagnosis:

Troubleshooting

NOTE
Priorities when dealing with a number of faults:
If fault “DTC P0225: Accelerator Pedal Position (APP) Sensor Assembly / Switch “C” Circuit
Malfunction” is present at the same time, check that the sensor is connected correctly.
In the event of the simultaneous presence of fault “DTC P0235: Turbo / Super Charger Boost Sensor
“A” Circuit Malfunction” or “DTC P0470: Exhaust Pressure Sensor Malfunction”, check that the boost
pressure sensor circuit connector is connected correctly.

The sensors connected to supply No.1 are:
• Differential pressure sensor.
• Boost pressure sensor.
• Accelerator pedal position (APP) sensor (main).
To locate any faulty sensor and/or connection, disconnect one of these sensors then check whether the fault
becomes stored.
If the fault is still present, start the operation again with the other sensor.
(Wait a few seconds between each disconnection to allow the ECM to make the measurement).
If the fault is stored after a disconnection, change the faulty sensor or repair its connection.
Clear the faults created by the multiple disconnections.
If the fault is still present when both these sensors have been disconnected:
1. Check the insulation against vehicle body ground of the following connections:

– Between “C76-3” wire of boost pressure sensor connector and “C86-42” terminal of ECM connector
– Between “C76-4” wire of boost pressure sensor connector and “C86-19” terminal of ECM connector
– Between “E68-2” wire of accelerator pedal position (APP) sensor connector and “E66-4” terminal of ECM

connector

– Between “E68-3” wire of accelerator pedal position (APP) sensor connector and “E66-3” terminal of ECM

connector

Repair if necessary.

2. Check the insulation against +12 V of the following connections:

– Between “C76-4” wire of boost pressure sensor connector and “C86-19” terminal of ECM connector
– Between “C76-1” wire of boost pressure sensor connector and “C86-45” terminal of ECM connector
– Between “C76-3” wire of boost pressure sensor connector and “C86-42” terminal of ECM connector
– Between “E68-4” wire of accelerator pedal position (APP) sensor connector and “E66-5” terminal of ECM

connector

– 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 “C89-1” wire of differential pressure sensor connector and “C86-42” terminal of ECM connector
– Between “C89-3” wire of differential pressure sensor connector and “C85-14” terminal of ECM connector
– Between “C89-2” wire of differential pressure sensor connector and “C85-12” terminal of ECM connector

Repair if necessary.

3. Check the insulation between the following connections after disconnecting the sensors and ECM:

– “E68-1” and “E68-4” wires of the accelerator pedal position (APP) sensor connector.
– “C76-1” and “C76-3” wires of the boost pressure sensor connector.
– “C89-2” and “C89-1” wires of differential pressure sensor connector.

If these checks do not produce the correct results, replace the faulty sensor(s).
If the fault is still present, substitute a known-good ECM and recheck.

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