Mazda CX 7. Manual — part 94
SYMPTOM TROUBLESHOOTING [L3 WITH TC]
01-03–73
01-03
End Of Sie
NO.29 SPARK PLUG CONDITION[L3 WITH TC]
id010339803600
Diagnostic procedure
3
Verify test results.
• If normal, return to the diagnostic index to service any additional symptoms.
• If a malfunction remains, inspect the related Service Bulletins and/or On-line Repair Information and perform the
repair or diagnosis.
— If the vehicle is repaired, troubleshooting is completed.
— If the vehicle is not repaired or additional diagnostic information is not available, reprogram the PCM if a later
calibration is available. Retest.
STEP
INSPECTION
ACTION
29
SPARK PLUG CONDITION
DESCRIPTION
Incorrect spark plug condition
POSSIBLE CAUSE
Note
• Inspecting the condition of the spark plugs can determine whether a problem is related to a
specific cylinder or possibly all cylinders.
Wet/carbon stuck on specific plug:
• Spark— Weak, not visible
• Air/fuel mixture— Excessive fuel injection volume
• Compression— No compression, low compression
• Malfunctioning spark plug
Grayish white with specific plug:
• Air/fuel mixture— Insufficient fuel injection volume
• Malfunctioning spark plug
Wet/carbon is stuck on all plugs:
• Spark— Spark weak
• Air/fuel mixture— Too rich
• Compression— Low compression
• Clogging in intake/exhaust system
Grayish white with all plugs:
• Air/fuel mixture— Too lean
Warning
The following troubleshooting flow chart contains the fuel system diagnosis and repair
procedures. Read the following warnings before servicing the fuel system:
• Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always
keep sparks and flames away from fuel.
• Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or
death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete
“BEFORE REPAIR PROCEDURE” and “AFTER REPAIR PROCEDURE” described in this
manual.
(See01-14-4 BEFORE REPAIR PROCEDURE[L3 WITH TC].)
(See01-14-4 AFTER REPAIR PROCEDURE[L3 WITH TC].)
Caution
• Disconnecting/connecting the quick release connector without cleaning it may possibly
cause damage to the fuel pipe and quick release connector. Always clean the quick release
connector joint area before disconnecting/connecting, and make sure that it is free of
foreign material.
STEP
INSPECTION
RESULTS
ACTION
1
Remove all the spark plugs.
Inspect the spark plug condition.
Is the spark plug condition normal?
Yes
Troubleshooting completed.
No
Specific plug is wet or covered with carbon:
Go to the next step.
Specific plug looks grayish white:
Go to Step 9.
All plugs are wet or covered with carbon:
Go to Step 11.
All plugs look grayish white:
Go to Step 19.
2
Is the spark plug wet/covered with carbon from
engine oil?
Yes
Inspect all areas related to oil.
No
Go to the next step.
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SYMPTOM TROUBLESHOOTING [L3 WITH TC]
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3
Inspect the spark plugs for the following:
• Cracked insulator
• Heat range
• Air gap
• Worn electrode
Is the spark plug normal?
Yes
Go to the next step.
No
Replace the spark plug.
4
Inspect the compression pressure at the
suspected malfunctioning cylinder.
Is the compression pressure correct?
(See01-10-9 COMPRESSION INSPECTION[L3
WITH TC].)
Yes
Go to the next step.
No
Repair or replace the malfunctioning parts.
5
Install all the spark plugs.
Perform the spark test at the suspected
malfunctioning cylinder.
Is a strong blue spark visible?
(Compare with normal cylinder.)
Yes
Go to the next step.
No
Repair or replace the malfunctioning parts.
6
Access and monitor the FUEL_PRES PID.
Is the FUEL_PRES PID value within the
specification?
(See01-40-6 PCM INSPECTION[L3 WITH TC].)
Yes
Inspect the suspected cylinders fuel injector for the
following:
• Open or short circuit in the fuel injector
(See01-14-27 FUEL INJECTOR INSPECTION[L3
WITH TC].)
No
Go to the next step.
7
Inspect the fuel pressure sensor.
(See01-40-35 FUEL PRESSURE SENSOR
INSPECTION[L3 WITH TC].)
Is the fuel pressure sensor normal?
Yes
Go to the next step.
No
Replace the delivery pipe.
8
Inspect the high pressure fuel pump.
(See01-14-19 HIGH PRESSURE FUEL PUMP
INSPECTION[L3 WITH TC].)
Is the high pressure fuel pump normal?
Yes
Replace the delivery pipe.
Retest Step 6
If the FUEL_PRES PID indication is other that the
specification, replace the high pressure fuel pump.
No
Replace the high pressure fuel pump.
9
Inspect the spark plug for the following.
• Heat range
• Air gap
Is the spark plug normal?
Yes
Go to the next step.
No
Replace the spark plug.
10
Perform the KOER self-test function using the M-
MDS.
(See01-02-10 KOEO/KOER SELF TEST[L3
WITH TC].)
Is the suspected cylinder injector circuit related
DTC (P0201, P0202, P0203 or P0204) present?
Yes
Go to appropriate the DTC test.
(See01-02-13 DTC TABLE[L3 WITH TC].)
No
Inspect the suspect cylinder fuel injector for the
following:
• Resistance
(See01-14-27 FUEL INJECTOR INSPECTION[L3
WITH TC].)
11
Is the air cleaner element free of blockage?
Yes
Go to the next step.
No
Replace the air cleaner element.
12
Perform the spark test.
(See01-03-78 ENGINE CONTROL SYSTEM
OPERATION INSPECTION[L3 WITH TC].)
Is a strong blue spark visible at each cylinder?
Yes
Go to the next step.
No
Repair or replace the malfunctioning parts.
13
Access and monitor the FUEL_PRES PID.
Is the FUEL_PRES PID value within the
specification?
(See01-40-6 PCM INSPECTION[L3 WITH TC].)
Yes
Go to step 16.
No
Go to the next step.
14
Inspect the fuel pressure sensor.
(See01-40-35 FUEL PRESSURE SENSOR
INSPECTION[L3 WITH TC].)
Is the fuel pressure sensor normal?
Yes
Go to the next step.
No
Replace the delivery pipe.
15
Inspect the high pressure fuel pump.
(See01-14-19 HIGH PRESSURE FUEL PUMP
INSPECTION[L3 WITH TC].)
Is the high pressure fuel pump normal?
Yes
Replace the delivery pipe.
Retest Step 13.
If the FUEL_PRES PID indication is other that the
specification, replace the high pressure fuel pump.
No
Replace the high pressure fuel pump.
STEP
INSPECTION
RESULTS
ACTION
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SYMPTOM TROUBLESHOOTING [L3 WITH TC]
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End Of Sie
16
Inspect the following PIDs:
• ECT
• O2S11 (When engine can be started)
• MAF
(See01-40-6 PCM INSPECTION[L3 WITH TC].)
Are the PIDs normal?
Yes
Go to the next step.
No
Repair or replace the malfunctioning parts.
17
Perform the purge control inspection.
(When engine can be started)
(See01-03-78 ENGINE CONTROL SYSTEM
OPERATION INSPECTION[L3 WITH TC].)
Is the purge control correct?
Yes
Go to the next step.
No
Repair or replace the malfunctioning parts.
18
Perform the compression inspection.
Is the compression correct?
Yes
Inspect for clogging in the exhaust system.
No
Repair or replace the malfunctioning parts.
19
When the engine cannot be started, inspect the
intake-air system for air leakage.
When the engine can be started, perform the
intake manifold vacuum inspection.
Is air sucked in from the intake-air system?
Yes
Repair or replace the malfunctioning part.
No
Go to the next step.
20
Access and monitor the FUEL_PRES PID.
Is the FUEL_PRES PID value within the
specification?
(See01-40-6 PCM INSPECTION[L3 WITH TC].)
Yes
Inspect for the following PIDs:
• ECT
• O2S11
• O2S12
• MAF
(See01-40-6 PCM INSPECTION[L3 WITH TC].)
Inspect the PCM ground condition.
No
Go to the next step.
21
Is vehicle accelerate performance normally?
Yes
Go to the next step.
No
Go to Step 13.
22
Inspect the fuel pressure sensor.
(See01-40-35 FUEL PRESSURE SENSOR
INSPECTION[L3 WITH TC].)
Is the fuel pressure sensor normal?
Yes
Go to the next step.
No
Replace the delivery pipe.
23
Replace the high pressure fuel pump.
Monitor FUEL_PRES PID.
Is the FUEL_PRES PID value within the
specified?
(See01-40-6 PCM INSPECTION[L3 WITH TC].)
Yes
Troubleshooting is completed.
Go to Step 16.
No
Inspect following PIDs.
• ECT
• O2S11
• O2S12
• MAF
(See01-40-6 PCM INSPECTION[L3 WITH TC].)
Inspect PCM ground condition.
24
Verify test results.
• If normal, return to the diagnostic index to service any additional symptoms.
• If a malfunction remains, inspect the related Service Bulletins and/or On-line Repair Information and perform the
repair or diagnosis.
— If the vehicle is repaired, troubleshooting is completed.
— If the vehicle is not repaired or additional diagnostic information is not available, reprogram the PCM if a later
calibration is available. Retest.
STEP
INSPECTION
RESULTS
ACTION
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SYMPTOM TROUBLESHOOTING [L3 WITH TC]
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INTERMITTENT CONCERN TROUBLESHOOTING[L3 WITH TC]
id010339800400
Vibration Method
• If a malfunction occurs or becomes worse while driving on a rough road or when the engine is vibrating,
perform the steps below.
Note
• There are several reasons why the vehicle or engine vibration could cause an electrical malfunction.
Check the following:
— Connectors are not fully seated.
— Wiring harnesses do not have full play.
— Wires laying across brackets or moving parts.
— Wires routed too close to hot parts.
• An improperly routed, improperly clamped, or loose harness can cause a wiring harness to become
pinched between parts.
• The connector joints, points of vibration, and places where the wiring harnesses pass through the firewall
and body panels are the major areas to be checked.
Inspection Method for Switch Connectors or Wires
1. Connect the M-MDS to the DLC-2.
2. Turn the ignition switch to the ON position (Engine off).
Note
• If engine starts and runs, perform the following steps during idle.
3. Access the PIDs for the switch you are inspecting.
4. Turn the switch on manually.
5. Slightly shake each connector or wiring harness
vertically and horizontally while monitoring the
PID.
• If the PID value is unstable, check for a poor
connection.
Inspection Method for Sensor Connectors or Wires
1. Connect the M-MDS to the DLC-2.
2. Turn the ignition switch to the ON position (Engine off).
Note
• If the engine starts and runs, perform the following steps during idling.
3. Access the PIDs for the switch you are inspecting.
4. Slightly shake each connector or wiring harness
vertically and horizontally while monitoring the
PID.
• If the PID value is unstable, check for poor
connection.
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