Mazda 3 Workshop Manual page 326

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
• Inspect the same PIDs as in Step 4
while simulating FREEZE FRAME DATA
condition.
• Is there any signal which causes drastic
changes?
INSPECT CMP SENSOR
• Inspect CMP sensor.
6
(See CAMSHAFT POSITION (CMP)
SENSOR INSPECTION
• Is CMP sensor normal?
VERIFY CKP SENSOR INSTALLATION
CONDITION
7
• Inspect for CKP sensor looseness.
• Is CKP sensor loosen?
INSPECT IGNITION COIL WIRING
HARNESSES
• Inspect the ignition coil related wiring
8
harness condition (intermittent open or
short circuit) for all cylinders.
• Are wiring harness conditions normal?
INSPECT IGNITION SYSTEM
OPERATION
• Turn the ignition switch off.
• Perform spark test.
9
(See Spark Test.)
• Is strong blue spark visible at each
cylinder?
INSPECT POWER SUPPLY TERMINAL
AT IGNITION COIL CONNECTOR
• Disconnect the ignition coil connector.
• Turn the ignition switch to the ON
10 position (Engine off).
• Measure the voltage between ignition
coil terminal A (wiring harness-side) and
body ground.
• Is the voltage reading B+?
INSPECT IGNITION COIL
RESISTANCE
11
• Inspect ignition coil resistance.
Downloaded from
No Go to the next step.
Yes Go to the next step.
No
[LF].)
Yes Retighten the CKP sensor, then go to Step 21.
No Go to the next step.
Yes Go to the next step.
No Repair the wiring harnesses, then go to Step 21.
Yes Go to the next step.
No
Yes Go to the next step.
No
Yes Go to step 21.
No Replace the ignition coil, then go to Step 21.
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Then go to Step 21.
Inspect installation condition and damages on
timing belt and gears, repair the malfunctioning
part.
• If it is normal, replace the CMP sensor.
Then go to Step 21.
Repair or replace the malfunctioning part
according to spark test result.
Then go to Step 21.
Inspect for open circuit in wiring harness between
ignition coil terminal A and ignition switch. Repair
or replace the wiring harness, then go to Step 21.
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