Suzuki Engine 2002 GRAND VITARA SQ625, Service Manual

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6F1-6 IGNITION SYSTEM (FOR G16 ENGINE)
Reference
Oscilloscope waveforms of CMP sensor and ignition trigger signal
are as shown in figure when connecting oscilloscope between ter-
minals C51-2-26 and C51-3-26 of ECM (PCM) connectors con-
nected to ECM (PCM), and between terminal C51-2-24 and
ground.
7 Ignition Coil Assembly Check
1) Check ignition coil assembly for damage,
deterioration and terminal corrosion, refer-
ring to “Ignition Coil Assembly” in this sec-
tion.
Is check result satisfactory?
Go to Step 8. Replace ignition coil
assembly.
8 Ignition Coil Assembly Check
1) Substitute a known-good ignition coil
assembly and then repeat Step 2.
Is check result of Step 2 satisfactory?
Malfunction of ignition coil
assembly. Go to Step 9.
9 CMP Sensor Check
1) Check CMP sensor and signal rotor, refer-
ring to Steps 6 and 7 of DTC P0340 (No.42)
Diag. Flow table in Section 6.
Is check result satisfactory?
Substitute a known-good
ECM (or PCM) and then
repeat Step 2. Tighten CMP sensor bolt,
replace CMP sensor or
camshaft.
10 Ignition Timing Check
1) Check initial ignition timing and ignition tim-
ing advance, referring to “Ignition Timing
Check” in this section.
Is check result satisfactory?
System is in good condi-
tion. Adjust ignition timing if
adjustable or check CMP
sensor, signal rotor (cam-
shaft looseness), crank-
shaft pulley/timing belt
cover installation and
input signals related to
ignition system.
Step Action Yes No
[A] : Oscilloscope waveforms at specified idle speed
1. CMP sensor signal
2. Ignition trigger signal
3. Primary coil current flow time