Suzuki Grand Vitara JB419. Manual - part 24

Engine General Information and Diagnosis:  1A-73

DTC P0645: A/C Clutch Relay Control Circuit

S5JB0B1104149

NOTE

• For vehicle not equipped with A/C system, it is not abnormal even if the DTC is detected.
• 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 CO.0: Open circuit or short circuit to vehicle body ground

Troubleshooting for CC.1: Short circuit to +12 V

Displaying on SUZUKI scan tool

Detecting condition

CO.0

Open circuit or short circuit to vehicle body ground

CO.1

Short circuit to +12 V

Check the condition of the A/C compressor relay.
Check the ECM connections.
Repair if necessary.
Check the A/C compressor relay mounting connections.
If these checks are correct,
Check the continuity and insulation from vehicle body ground of the following connections:
• Between “E33-12” wire of A/C compressor relay mounting connector and “E66-13” terminal of ECM connector
• Between “E33-11” wire of A/C compressor relay 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 A/C compressor relay.
Check the ECM connections.
Repair if necessary.
Check the A/C compressor relay mounting connections.
Check the continuity and insulation from +12 V of the following connection:
• Between “E33-12” wire of A/C compressor relay mounting connector and “E66-13” terminal of ECM connector
Repair if necessary.
If the fault is still present, substitute a known-good ECM and recheck.

1A-74 Engine General Information and Diagnosis: 

DTC P0651: Sensor Reference Voltage “B” Circuit / Open Malfunction

S5JB0B1104127

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 EGR functions is inhibited.
– The cruise control function is deactivated.
– Engine speed is limited.
– The Injection warning light (gravity 1 warning light) is lit.
– The Malfunction indicator light (MIL) will light up after three consecutive cycles (starting +5 

seconds + turn OFF ignition switch and wait 40 second).

• 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

Engine General Information and Diagnosis:  1A-75

Troubleshooting

The sensors connected to supply No.2 are:
• EGR valve position sensor.
• Sensor for accelerator pedal position (APP) sensor (sub).
To locate any faulty sensor and/or connection, disconnect one of the sensors then check whether the fault 
becomes stored.
If the fault is still present, repeat the operation with the other sensors.
(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 “C10-1” wire of EGR valve connector and “C86-43” terminal of ECM connector
– Between “C10-3” wire of EGR valve connector and “C86-20” terminal of ECM connector
– Between “E68-1” wire of accelerator pedal position (APP) sensor connector and “E66-15” terminal of ECM 

connector

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

connector
Repair if necessary.

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

– Between “C10-1” wire of EGR valve connector and “C86-43” terminal of ECM connector
– Between “C10-3” wire of EGR valve connector and “C86-20” terminal of ECM connector
– Between “C10-2” wire of EGR valve connector and “C85-15” terminal of ECM connector
– Between “E68-1” wire of accelerator pedal position (APP) sensor connector and “E66-15” terminal of ECM 

connector

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

connector

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

connector
Repair if necessary.

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

– “E68-1” and “E68-5” wires of accelerator pedal position (APP) sensor connector.
– “C10-1” and “C10-2” wires of the EGR valve position 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.

1A-76 Engine General Information and Diagnosis: 

DTC P0670: Glow Plug Module Control Circuit Malfunction

S5JB0B1104128

NOTE

• Cylinder number is counted from flywheel side.
• Conditions for applying fault finding procedures to stored faults:

The fault is declared present after several attempts to start the engine, or perform   output test “Pre/
post Heater Relay Control” on SUZUKI scan tool.

• It is difficult or even impossible to start the engine when cold.
• 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.

 

Wiring Diagram
For wiring circuit and connector number, refer to “A-5 Engine and A/C Control System Circuit Diagram (DSL) in 
Section 9A”.

Troubleshooting

Check the glow plug control module connections.
Check the connections on all the glow plugs.
Repair if necessary.
Check the condition of the 80A fuse on the battery fuse box.
Check the resistance of the glow plugs:
Replace any plug whose resistance is not less than 2 

Ω at 20 °C, 68 °F.

Check the following connections for continuity and make sure there is no interference resistance:
• Between cylinder 3 glow plug terminal and “C74-5” wire of the glow plug control module connector
• Between cylinder 1 glow plug terminal and “C74-8” wire of the glow plug control module connector
• Between cylinder 4 glow plug terminal and “C74-4” wire of the glow plug control module connector
• Between cylinder 2 glow plug terminal and “C74-6” wire of the glow plug control module connector
Check for the presence of +12 V on “C74-7” wire of the glow plug control module (by 80A fuse on battery fuse 
box).
If the fault is still present.
Check the ECM connections.
Check continuity and make sure there is no interference resistance on the following connection:
• Between “C74-3” wire of glow plug control module connector and “C85-1” terminal of ECM connector
• Between “C74-1” wire of glow plug control module connector and “C85-17” terminal of ECM connector
If the fault is still present, replace the glow plug control module.