Suzuki Grand Vitara JB419. Service manual — part 25

Engine General Information and Diagnosis: 1A-77

DTC P0685: ECM / PCM Power Relay Control Circuit / Open Malfunction

S5JB0B1104129

NOTE

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

Only deal with this fault if this fault is stored.

• The main relay located on fuse box No.2.
• 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”.

Detecting Condition

Troubleshooting

DTC P0697: Sensor Reference Voltage “C” Circuit / Open Malfunction

S5JB0B1104130

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 function is inhibited.
– Engine stops.
– The Red stop warning light (gravity 2 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

Relay cut out too soon

2.DEF

Relay cut out too late

• Check the ECM connections.

Repair if necessary.

• Check the condition of the battery terminals making sure they are correctly tightened.

Check the condition of the main relay and its mounting.
Repair if necessary.

Check the following connection for continuity and for the absence of interference resistance:
• Between “E33-8” wire of main relay mounting connector and “C86-14” terminal of ECM connector
Repair if necessary.
If the fault is still present, substitute a known-good ECM and recheck.

Displaying on SUZUKI scan tool

Detecting condition

1.DEF

Sensor reference voltage too low

2.DEF

Sensor reference voltage too high

1A-78 Engine General Information and Diagnosis:

Troubleshooting

The sensors connected to supply No.3 are:
• Fuel pressure sensor.
• MAF sensor assembly with IAT sensor.
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 computer 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 “C84-2” wire of fuel pressure sensor connector and “C86-32” terminal of ECM connector
– Between “C84-3” wire of fuel pressure sensor connector and “C86-48” 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

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

connector
Repair if necessary.

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

– Between “C84-2” wire of fuel pressure sensor connector and “C86-32” terminal of ECM connector
– Between “C84-3” wire of fuel pressure sensor connector and “C86-48” terminal of ECM connector
– Between “C84-1” wire of fuel pressure sensor connector and “C86-46” 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

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

connector

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

– Between “C84-1” and “C84-3” wires of fuel pressure sensor connector and “C13-2” and “C13-5” wires of

MAF sensor assembly with IAT 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.

Engine General Information and Diagnosis: 1A-79

DTC P0830: Clutch Pedal Switch “A” Circuit Malfunction

S5JB0B1104131

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 after the clutch pedal is depressed, or during a road test.

• If this fault is present, the cruise control / speed limiter function will be 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

Troubleshooting

DTC P1431: Clogged Particulate Filter Failures Malfunction

S5JB0B1104132

CAUTION

!

The parameters must be reinitialised after any procedure is carried out on the diesel particulate filter.
Use command “Initialize Diesel PF data” on SUZUKI scan tool, and diesel particulate filter after-sales
regeneration referring to “Diesel Particulate Filter After-sales Regeneration Procedure in Section 1C”
or “Diesel Particulate Filter Removal and Installation in Section 1K”.

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:

– Diesel particulate filter regenerations are inhibited.
– The EGR function is inhibited.
– The vehicle performances are reduced.
– The Injection warning light (gravity 1 warning light) is lit.

Displaying on SUZUKI scan tool

Detecting condition

1.DEF

Signal absent

2.DEF

Inconsistency of signal

Check the condition and adjustment of the clutch pedal position (CPP) switch.
Repair if necessary.
If these checks are correct:
• Check the connections of the clutch pedal switch.
• Check the ECM connections.
Repair if necessary.
Check continuity and make sure there is no interference resistance on the following connection:
• Between “E71-2” wire of clutch pedal switch connector and “E66-30” terminal of ECM connector.
Repair if necessary.
Check for the presence of ground on “E71-1” wire of the clutch pedal switch.
Repair if necessary.
If the fault is still present, substitute a known-good ECM and recheck.

1A-80 Engine General Information and Diagnosis:

Troubleshooting

DTC P1436: Regeneration Request Failures Malfunction

S5JB0B1104133

CAUTION

!

• The parameters must be reinitialised after any procedure is carried out on the diesel particulate

filter.
Use command “Initialize Diesel PF data” on SUZUKI scan tool, and diesel particulate filter after-
sales regeneration referring to “Diesel Particulate Filter After-sales Regeneration Procedure in
Section 1C” or “Diesel Particulate Filter Removal and Installation in Section 1K”.

• In order to enable the diesel particulate filter to self-clean automatically, we recommend that you

drive as soon as possible for up to about 20 minutes after diesel particulate filter warning light
turning ON, at an average speed of 75 km/h (46 mph) compatible with:
– The road conditions.
– Respect for authorised speed limits.

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:

– Diesel particulate filter warning light is lit.
– Specific driving requirement to regenerate the diesel particulate filter when driving.

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

– Firstly, deal with fault “DTC P1431: Clogged Particulate Filter Failures Malfunction” if it is present

or stored.

Troubleshooting

Check the condition of the following pressure pipes:
• Differential pressure sensor downstream side pipe if necessary.
The fault appears if the weight of soot contained in the filter is greater than 50 g.
Carry out diesel particulate filter after-sales regeneration referring to “Diesel Particulate Filter After-sales
Regeneration Procedure in Section 1C”.
If the fault is still present, substitute a known-good ECM and recheck.

• Fault appears following several failed regeneration attempts when driving, or if the weight of soot in the filter is

above 50 g.

• Do not start diesel particulate filter after-sales regeneration with SUZUKI scan tool.

Regeneration must absolutely be carried out when driving insofar as possible.
The diesel particulate filter warning light is displayed on the combination meter to show a risk of the filter
becoming saturated.