Ignition System Troubleshooting - Suzuki GF60A Service Manual

Ignition System Troubleshooting

Before starting the troubleshooting, make sure that:
• There is not self-diagnostic code indication.
• Emergency stop switch plate is set in place.
Perform the following ignition system tests when the engine is hard to start in order to determine if the cause is in the
ignition or another system.
Step
1 Check the ignition system connector for poor connections. Is
there connection in the ignition system connectors?
2 Check spark condition.
3 Check if the spark plugs are in good condition.
4 Check ignition coil assembly power supply and ground
circuits for open and short. Are circuits in good condition?
5 Check ignition coil operating signal. Is result OK?
6 Measure the battery voltage between input lead wire at ECM
with the ignition switch in "ON" position. Is result OK?
7 Check CKP sensor. Refer to "CKP Sensor Inspection" in
Section 1C (Page 1C-10). Is result OK?
8 Check CMP sensor. Refer to "CMP Sensor Inspection" in
Section 1C (Page 1C-11). Is result OK?
9 Substitute a known-good ignition coil assembly then repeat
step 2. Is check result of step 2 satisfactory?
10 Check the ignition timing by using timing light (5° DTBC at 1
000 r/min). Is result OK?
Action Yes
Go to step 2.
Go to step 3.
Go to step 4.
Go to step 5.
Go to step 6.
Go to step 7.
Go to step 8.
Go to step 9.
Go to step 10.
System is in good
condition.
Ignition System: 1H-5
ZAJ6111804002
No
Poor connection of
connectors.
No or weak sparks.
Replace spark plug with
a new one.
Repair or replace.
Check ignition coil
operating signal wire for
open, short and poor
connection.
• Faulty ignition switch.
• Faulty ECM main
relay.
• Broken wire harness
or poor connection of
related circuit
connector.
• Check air gap
between CKP sensor
and flywheel reluctor
bars.
• Adjust CKP sensor
air gap.
• Replace CKP sensor
or flywheel.
• Check CMP sensor.
• Check CMP sensor
trigger vane.
• Replace CMP sensor
or In. camshaft.
Substitute a known
good ECM, then repeat
step 2.
Check input signals
related to this system.