Diagnostic procedure
STEP
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INSPECTION
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ACTION
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1
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PERFORM DTC CONFIRMATION PROCEDURE
• Perform the DTC CONFIRMATION PROCEDURE.
• Is the same DTC present?
|
Yes
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Go to the next step.
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No
|
Intermittent concern exists.
Go to the INTERMITTENT CONCERN TROUBLESHOOTING procedures.
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2
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VERIFY RELATED PENDING CODE OR STORED DTC
• Turn the ignition switch off, then to the ON position (Engine off).
• Verify the related PENDING CODE or stored DTCs.
• Are other DTCs present?
|
Yes
|
• If a misfire DTC is present, go to Step 7.
• If any other DTC is present, go to the appropriate DTC inspection.
(See DTC table (With WU-TWC).)
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No
|
• If a driveability concern is present, go to Step 7.
• If other, go to the next step.
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3
|
IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA
• Is DTC P2187 displayed in FREEZE FRAME DATA?
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Yes
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Go to the next step.
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No
|
Go to the FREEZE FRAME DATA DTC inspection.
(See DTC table (With WU-TWC).)
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4
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VERIFY CURRENT INPUT SIGNAL STATUS (IGNITION SWITCH TO ON/IDLE)
• Access the ECT, MAF, TP, and VSS PIDs using the WDS or equivalent.
• Is there any signal that is far out of specification during KOER?
|
Yes
|
Inspect the suspected sensor for excessive resistance in the related wiring harnesses.
Repair or replace if necessary.
Then go to Step 16.
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No
|
Go to the next step.
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5
|
VERIFY CURRENT INPUT SIGNAL STATUS UNDER TROUBLE CONDITION
• Inspect the same PIDs as Step 3 while simulating FREEZE FRAME DATA condition.
• Is there any signal which causes drastic changes?
|
Yes
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Inspect the suspected sensor and the related wiring harnesses, and repair or replace.
Then go to Step 16.
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No
|
Go to the next step.
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6
|
VERIFY CURRENT INPUT SIGNAL STATUS OF HO2S
• Access the O2S11 PID using the WDS or equivalent.
• Verify the PID under the following accelerator pedal condition (in PARK (ATX) or NEUTRAL (MTX)).
• Is the PID normal?
- Above 0.45 V when the accelerator pedal is suddenly depressed (rich condition) - Below 0.45 V just after releasing accelerator pedal (lean condition) |
Yes
|
Go to the next step.
|
No
|
Visually the inspect for any gas leakage between the exhaust manifold and the HO2S.
Then go to Step 16.
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7
|
INSPECT MAF PID
• Start the engine.
• Access the MAF PID using the WDS or equivalent.
• Verify that the MAF PID changes quickly according to the engine speed.
• Is the MAF PID response normal?
|
Yes
|
Go to the next step.
|
No
|
Replace the MAF/IAT sensor, then go to Step 16.
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8
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INSPECT FOR EXCESSIVE AIR SUCTION OF INTAKE AIR SYSTEM
• Visually inspect hoses in the intake-air system for looseness, cracks or damage.
• Is there any malfunction?
|
Yes
|
Repair or replace the source of the air suction, then go to Step 16.
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No
|
Go to the next step.
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9
|
INSPECT PURGE SOLENOID VALVE STUCK OPEN
• Turn the ignition switch off.
• Disconnect both hoses from the purge solenoid valve.
• Blow air through the purge solenoid valve.
• Does air blow through?
|
Yes
|
Replace the purge solenoid valve.
Then go to Step 16.
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No
|
Go to the next step.
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10
|
INSPECT FUEL LINE PRESSURE
• Turn the ignition switch off.
• Inspect the fuel line pressure while the engine is running.
• Is the fuel line pressure normal?
|
Yes
|
Go to Step 12.
|
No
|
If the fuel pressure is too high, replace the fuel pump unit, then go to Step 16.
If the fuel line pressure is low, go to the next step.
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11
|
INSPECT FUEL LINE FROM FUEL PUMP TO FUEL DELIVERY PIPE
• Visually the inspect the fuel line for any leakage.
• Is the any fuel leakage?
|
Yes
|
Replace the suspected fuel line, then go to Step 16.
|
No
|
Inspect for foreign material or stains inside the fuel filter (low pressure).
• If for foreign material or stains are inside the fuel filter (low pressure), clean the fuel tank and filter, then go to Step 16.
• If for no foreign material or stains are inside the fuel filter (low pressure), go to the next step.
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12
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INSPECT IGNITION SYSTEM
• Perform the spark test.
• Is a strong blue spark visible at each cylinder?
|
Yes
|
Go to the next step.
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No
|
Repair or replace the malfunctioning part according to the spark test results, then go to Step 16.
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13
|
INSPECT ENGINE COMPRESSION
• Inspect the engine compression.
• Is it normal?
|
Yes
|
Go to the next step.
|
No
|
Perform the engine overhaul for repairs, then go to Step 16.
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14
|
INSPECT VARIABLE VALVE TIMING CONTROL SYSTEM OPERATION
• Inspect the variable valve timing control system operation.
• Does the variable valve timing control system function properly?
|
Yes
|
Go to the next step.
|
No
|
Repair or replace the malfunctioning parts according to the inspection results, then go to Step 16.
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15
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INSPECT FUEL INJECTOR OPERATION
• Remove the fuel injector.
• Inspect the fuel injector (resistance, injection amount).
• Is the fuel injector normal?
|
Yes
|
Go to the next step.
|
No
|
Replace the suspected fuel injector, then go to the next step.
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16
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VERIFY TROUBLESHOOTING OF DTC P2187 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear the DTC from the PCM memory using the WDS or equivalent.
• Perform the KOER self-test.
• Is the same DTC present?
|
Yes
|
Replace the PCM, then go to the next step.
|
No
|
Go to the next step.
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17
|
VERIFY AFTER REPAIR PROCEDURE
• Perform the "AFTER REPAIR PROCEDURE".
• Are any DTCs present?
|
Yes
|
Go to the applicable DTC inspection.
(See DTC table (With WU-TWC).)
|
No
|
DTC troubleshooting completed.
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