Diagnostic Information And Procedures; Ignition System Symptom Diagnosis; Reference Waveform Of Ignition System; Ignition System Check - Suzuki GRAND VITARA Owner's Manual

[A]: For M16 engine
[B]: For J20 engine
1. ECM
2. Ignition coil assembly for No.1 and No.4 spark
plugs (for M16 engine)
3. Ignition coil assembly for No.2 and No.3 spark
plugs (for M16 engine)
4. CMP sensor
5. CKP sensor
6. MAP sensor

Ignition System Symptom Diagnosis

Condition
Engine cranks, but will
not start or hard to start
(No spark)
Poor fuel economy or
engine performance

Reference Waveform of Ignition System

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

Step
1 Was "Engine and Emission Control System Check"
performed?
2

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?
7. ECT sensor
8. MAF and IAT sensor
9. Electric throttle body assembly
10. High-tension cords (for M16 engine)
11. Knock sensor
12. Data link connector
13. Rear wheel speed sensor (RH, LH) (VSS)
14. Fuse box No.2

Diagnostic Information and Procedures

Possible cause
Blown fuse for ignition coil
Loose connection or disconnection of
high-tension cord(s) (for M16 engine) or
lead wire
Faulty high-tension cord(s) (for M16
engine)
Faulty spark plug(s)
Faulty ignition coil
Faulty CKP sensor or CKP sensor plate Clean, tighten or replace.
Faulty CMP sensor or sensor rotor tooth
of camshaft
Faulty ECM
Incorrect ignition timing
Faulty spark plug(s) or high-tension
cord(s) (for M16 engine)
Faulty ignition coil assembly
Faulty CKP sensor or CKP sensor plate Clean, tighten or replace.
Faulty CMP sensor or sensor rotor tooth
of camshaft
Faulty knock sensor
Faulty ECM
Action
15. Ignition coil assembly for No.1 (for J20 engine)
16. Ignition coil assembly for No.2 (for J20 engine)
17. Ignition coil assembly for No.3 (for J20 engine)
18. Ignition coil assembly for No.4 (for J20 engine)
19. ABS control module
Correction / Reference Item
Replace.
Connect securely.
Replace.
Replace.
Replace ignition coil assembly.
Clean, tighten or replace.
Replace.
Check related sensors and CKP sensor plate.
Adjust, clean or replace.
Replace.
Clean, tighten or replace.
Replace.
Replace.
Yes
Go to Step 2.
Go to Step 12.
Ignition System: 1H-4
S5JB0A1804001
S5JB0A1804002
S5JB0A1804003
No
Go to "Engine and
Emission Control
System Check: in
Section 1A".
Go to Step 3.