Spark Test - Mazda 3 Workshop Manual

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
• If the fuel pump relay is normal, inspect the following.
- Wiring harnesses and connectors (Main relay-fuel pump relay-PCM)

Spark Test

1. Remove the fuel pump relay.
2. Verify that each ignition coil and connector is connected properly.
3. Inspect the ignition system in the following procedure.
Warning
• High voltage in the ignition system can cause strong electrical shock which can result in serious
injury. Avoid direct contact to the vehicle body during the following spark test.
STEP
• Disconnect ignition coil from spark plugs.
• Remove spark plugs.
• Reconnect spark plugs to ignition coil.
1
• Ground spark plugs to engine.
• Is strong blue spark visible at each cylinder
while cranking?
• Inspect spark plugs for damage, wear,
carbon deposits and proper plug gap.
2
• Are spark plugs normal?
• Inspect following wiring harnesses for open
or short circuit:
- Ignition coil No.1 terminal B-PCM
terminal 2BE
- Ignition coil No.2 terminal B-PCM
terminal 2BF
3
- Ignition coil No.3 terminal B-PCM
terminal 2BG
- Ignition coil No.4 terminal B-PCM
terminal 2BH
• Are wiring harnesses normal?
• Measure the voltage at terminal A in each
ignition coils.
4
• Is voltage reading B+ ?
• Does PCM connector or ignition coil
5
connectors have poor connection?
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INSPECTION
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ACTION
Yes Ignition system is normal.
Some cylinders do not spark:
• Go to the next step.
No
All cylinders do not spark:
• Go to Step 4.
Yes Go to the next step.
No Replace spark plugs, then return to Step.1.
Inspect and replace ignition coil.
Yes
(See IGNITION COIL INSPECTION
Repair or replace the malfunctioning part,
No
then return to Step.1.
Yes Go to the next step.
No Inspect power supply circuit of ignition coils.
Repair or replace connector, then return to
Yes
Step.1.
No Go to the next step.
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