NO.29 SPARK PLUG CONDITION[L3 Turbo]

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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 injury or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete "BEFORE SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this manual.
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.

Diagnostic procedure

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.
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?
(See COMPRESSION INSPECTION[L3 Turbo].)
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?
(See PCM INSPECTION[L3 Turbo].)
Yes
Inspect the suspected cylinders fuel injector for the following:
•  Open or short circuit in the fuel injector
(See FUEL INJECTOR INSPECTION[L3 Turbo].)
No
Go to the next step.
7
Inspect the fuel pressure sensor.
(See FUEL PRESSURE SENSOR INSPECTION[L3 Turbo].)
Is the fuel pressure sensor normal?
Yes
Go to the next step.
No
Replace the delivery pipe.
8
Inspect the high pressure fuel pump.
(See HIGH PRESSURE FUEL PUMP INSPECTION[L3 Turbo].)
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.
(See KOEO/KOER SELF TEST[L3 Turbo].)
Is the suspected cylinder injector circuit related DTC (P0201, P0202, P0203 or P0204) present?
Yes
Go to appropriate the DTC test.
(See DTC TABLE[L3 Turbo].)
No
Inspect the suspect cylinder fuel injector for the following:
•  Resistance
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.
(See ENGINE CONTROL SYSTEM OPERATION INSPECTION[L3 Turbo].)
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?
(See PCM INSPECTION[L3 Turbo].)
Yes
Go to step 16.
No
Go to the next step.
14
Inspect the fuel pressure sensor.
(See FUEL PRESSURE SENSOR INSPECTION[L3 Turbo].)
Is the fuel pressure sensor normal?
Yes
Go to the next step.
No
Replace the delivery pipe.
15
Inspect the high pressure fuel pump.
(See HIGH PRESSURE FUEL PUMP INSPECTION[L3 Turbo].)
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.
16
Inspect the following PIDs:
•  ECT
•  O2S11 (When engine can be started)
•  MAF
(See PCM INSPECTION[L3 Turbo].)
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)
(See ENGINE CONTROL SYSTEM OPERATION INSPECTION[L3 Turbo].)
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?
(See PCM INSPECTION[L3 Turbo].)
Yes
Inspect for the following PIDs:
•  ECT
•  O2S11
•  O2S12
•  MAF
(See PCM INSPECTION[L3 Turbo].)
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.
(See FUEL PRESSURE SENSOR INSPECTION[L3 Turbo].)
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?
(See PCM INSPECTION[L3 Turbo].)
Yes
Troubleshooting is completed.
Go to Step 16.
No
Inspect following PIDs.
•  ECT
•  O2S11
•  O2S12
•  MAF
(See PCM INSPECTION[L3 Turbo].)
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.