Suzuki Grand Vitara JB416 / JB420. Manual - part 131

1H-3 Ignition System:

Component Location

Ignition System Components Location

S5JB0A1803001

NOTE
The figure shows left-hand steering vehicle. For right-hand steering vehicle, parts with (*) are installed
at the opposite side.

2. Main relay

10. No.4 spark plug

18. Ignition coil assembly for No.1

3. Ignition coil assembly for No.1 and No.4 spark

plugs

11. Sensed information (MAP sensor, ECT

sensor, MAF and IAT sensor, TP sensor,
Knock sensor, wheel speed signal (ABS),
Electric load signal, Engine start signal,
Torque reduction signal (TCM))

19. Ignition coil assembly for No.2

4. Ignition coil assembly for No.2 and No.3 spark

plugs

12. ECM

20. Ignition coil assembly for No.3

5. CMP sensor

13. Fuse box No.2

21. Ignition coil assembly for No.4

6. CKP sensor

14. “IGN” fuse

12*

14*

12*

14*

[A]

[B]

I5JB0A180002-03

[A]: For M16 engine

7. ECT sensor

15. Ignition coil assembly for No.1 (for J20 engine)

[B]: For J20 engine

8. MAF and IAT sensor

16. Ignition coil assembly for No.2 (for J20 engine)

1. ECM

9. Electric throttle body assembly

17. Ignition coil assembly for No.3 (for J20 engine)

Ignition System: 1H-4

Diagnostic Information and Procedures

Ignition System Symptom Diagnosis

S5JB0A1804001

Reference Waveform of Ignition System

S5JB0A1804002

Refer to “Reference waveform No.12 to 16” and “Reference waveform No.20 and 21” under “Inspection of ECM and
Its Circuits in Section 1A” for waveform of Ignition trigger signal.

Ignition System Check

S5JB0A1804003

2. Ignition coil assembly for No.1 and No.4 spark

plugs (for M16 engine)

10. High-tension cords (for M16 engine)

18. Ignition coil assembly for No.4 (for J20 engine)

3. Ignition coil assembly for No.2 and No.3 spark

plugs (for M16 engine)

11. Knock sensor

19. ABS control module

4. CMP sensor

12. Data link connector

5. CKP sensor

13. Rear wheel speed sensor (RH, LH) (VSS)

6. MAP sensor

14. Fuse box No.2

Condition

Possible cause

Correction / Reference Item

Engine cranks, but will
not start or hard to start
(No spark)

Blown fuse for ignition coil

Replace.

Loose connection or disconnection of
high-tension cord(s) (for M16 engine) or
lead wire

Connect securely.

Faulty high-tension cord(s) (for M16
engine)

Replace.

Faulty spark plug(s)

Replace.

Faulty ignition coil

Replace ignition coil assembly.

Faulty CKP sensor or CKP sensor plate Clean, tighten or replace.
Faulty CMP sensor or sensor rotor tooth
of camshaft

Clean, tighten or replace.

Faulty ECM

Replace.

Poor fuel economy or
engine performance

Incorrect ignition timing

Check related sensors and CKP sensor plate.

Faulty spark plug(s) or high-tension
cord(s) (for M16 engine)

Adjust, clean or replace.

Faulty ignition coil assembly

Replace.

Faulty CKP sensor or CKP sensor plate Clean, tighten or replace.
Faulty CMP sensor or sensor rotor tooth
of camshaft

Clean, tighten or replace.

Faulty knock sensor

Replace.

Faulty ECM

Replace.

Step

Action

Yes

Was “Engine and Emission Control System Check”
performed?

Go to Step 2.

Go to “Engine and
Emission Control
System Check in
Section 1A”.

Ignition spark test
1) Check all spark plugs for condition and type referring to

“Spark Plug Inspection”.

2) If OK, perform ignition spark test referring to “Ignition

Spark Test”.

Is spark emitted from all spark plugs?

Go to Step 12.

Go to Step 3.

DTC check
1) Perform DTC check referring to “DTC Check in Section

1A”.

Is DTC stored in ECM?

Go to applicable DTC
diag. flow.

Go to Step 4.

1H-5 Ignition System:

Electrical connection check
1) Check ignition coil assemblies and high-tension cords

(for M16 engine) for electrical connection.

Are they connected securely?

Go to Step 5 for M16
engine or go to Step 6
for J20 engine.

Connect securely.

High-tension cords check (for M16 engine)
1) Check high-tension cord for resistance referring to

“High-Tension Cord Inspection (For M16 Engine)”.

Is check result satisfactory?

Go to Step 6.

Replace high-tension
cord(s).

Ignition coil assembly power supply and ground circuit
check
1) Check ignition coil assembly power supply and ground

circuits for open and short.

Are circuits in good condition?

Go to Step 7.

Repair or replace.

Ignition coil assembly check
1) Check ignition coil for resistance referring to “Ignition

Coil Assembly (Including ignitor) Inspection”.

Is check result satisfactory?

Go to Step 8.

Replace ignition coil
assembly.

CKP sensor check
1) Check CKP sensor referring to “Crankshaft Position

(CKP) Sensor Inspection in Section 1C”.

Is check result satisfactory?

Go to Step 9.

Tighten CKP sensor
bolt, replace CKP
sensor or CKP sensor
plate.

CMP sensor check
1) Check CMP sensor referring to “Camshaft Position

(CMP) Sensor Inspection in Section 1C”.

Is check result satisfactory?

Go to Step 10.

Tighten CMP sensor
bolt, replace CMP
sensor or intake
camshaft.

10 Ignition trigger signal circuit check

1) Check ignition trigger signal wire for open, short and

poor connection.

Is circuit in good condition?

Go to Step 11.

Repair or replace.

11 A known-good ignition coil assembly substitution

1) Substitute a known-good ignition coil assembly and then

repeat Step 2.

Is check result of Step 2 satisfactory?

Go to Step 12.

Substitute a known-
good ECM and then
repeat Step 2.

12 Ignition timing check

1) Check initial ignition timing and ignition timing advance

referring to “Ignition Timing Inspection”.

Is check result satisfactory?

System is in good
condition.

Go to Step 13.

13 Knock sensor check

1) Confirm that knock sensor circuit is in good condition

referring to “DTC P0327 / P0328: Knock Sensor Circuit
Low / High in Section 1A”.

2) Check oscilloscope waveform of knock sensor signal

referring to “Reference waveform No.26” and
“Reference waveform No.27” under “Inspection of ECM
and Its Circuits in Section 1A”.

Is check result satisfactory?

Check CMP sensor,
CMP sensor rotor tooth
of camshaft, CKP
sensor, CKP sensor
plate and/or input
signals related to this
system.

Substitute a known-
good knock sensor and
recheck.

Step

Action

Yes

Ignition System: 1H-6

Ignition Spark Test

S5JB0A1804004

1) Remove engine cover.
2) Disconnect all injector couplers from injectors.

WARNING

Without disconnection of injector couplers, combustible gas may come out from spark plug holes
during this test and may get ignited in engine room.

3) Remove spark plug and check it for condition and type referring to “Spark Plug Inspection”.
4) If OK, connect ignition coil coupler to ignition coil assembly and connect spark plug to ignition coil assembly or

high-tension cord. Ground spark plug.

5) Crank engine and check if each spark plug sparks.

6) If no spark is emitted, inspect the related parts as described in “Ignition System Symptom Diagnosis”.

[A]: M16 engine model
[B]: J20 engine model

[A]

[B]

I5JB0A180003-01

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