Suzuki GRAND VITARA User Manual

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
[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)
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 No
1 Was “Engine and Emission Control System Check”
performed?
Go to Step 2. Go to “Engine and
Emission Control
System Check: in
Section 1A”.
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?
Go to Step 12. Go to Step 3.

Suzuki GRAND VITARA Specifications

General

Brand	Suzuki
Model	GRAND VITARA
Category	Automobile
Language	English