Ignition System Symptom Diagnosis; Reference Waveform Of Ignition System; Ignition Spark Test - Suzuki 2006 SX4 Service Manual

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.11 to 15" and "Reference waveform No.19 and 20" under "Inspection of ECM and Its
Circuits in Section 1A" for waveform of Ignition trigger signal.

Ignition Spark Test

1) 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.
2) Remove spark plug and check it for condition and type referring to "Spark Plug Inspection".
3) If OK, connect ignition coil coupler to ignition coil assembly and connect spark plug to ignition coil assembly.
4) 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".
Possible cause
Blown fuse for ignition coil
Loose connection or disconnection of
lead wire
Faulty spark plug(s)
Faulty ignition coil(s)
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)
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
Ignition System:
Correction / Reference Item
Replace.
Connect securely.
Replace.
Replace.
Clean, tighten or replace.
Replace.
Check related sensors and CKP sensor plate.
Adjust, clean or replace.
Replace.
Clean, tighten or replace.
Replace.
Replace.
I7RW01180003-03
1H-5
S6RW0C1804002
S6RW0C1804003
S6RW0C1804004