Diagnostic procedure
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STEP
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INSPECTION
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ACTION
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1
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VERIFY FREEZE FRAME DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAVE BEEN RECORDED
• Have FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS (Fuel system related) been recorded?
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Yes
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Go to the next step.
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No
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Record the FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS on the repair order, then go to the next step.
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2
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VERIFY RELATED REPAIR INFORMATION AVAILABILITY
• Verify related Service Information and/or on-line repair information availability.
• Is any related repair information available?
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Yes
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Perform repair or diagnosis according to the available repair information.
If the vehicle is not repaired, go to the next step.
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No
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Go to the next step.
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3
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VERIFY RELATED PENDING CODE OR STORED DTCS
• Turn the ignition switch to OFF, then ON (Engine off).
• Verify related pending code or stored DTCs using the WDS or equivalent.
• Is other DTC present?
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Yes
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If misfire DTC is present, go to Step 8.
If other DTC is present, go to appropriate DTC troubleshooting procedure.
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No
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If driveability concern is present, go to Step 8.
If not, go to the next step.
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4
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IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA
• Is DTC P2187 or P2189 on FREEZE FRAME DATA?
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Yes
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Go to the next step.
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No
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Go to troubleshooting procedures for DTC on FREEZE FRAME DATA.
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5
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VERIFY CURRENT INPUT SIGNAL STATUS (IGNITION SWITCH TO ON/IDLE)
• Access ECT, MAF, TP and VSS PIDs using the WDS or equivalent.
• Is there any signal that is far out of specification when ignition switch is ON and engine runs?
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Yes
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Inspect suspected sensor and excessive resistance in related wiring harnesses.
Repair or if necessary.
Then go to Step 16.
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No
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Go to the next step.
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6
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VERIFY CURRENT INPUT SIGNAL STATUS UNDER TROUBLE CONDITION
• Inspect same PIDs as Step 5 while simulating FREEZE FRAME DATA condition.
• Is there any signal which causes drastic changes?
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Yes
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Inspect suspected sensor and related wiring harnesses, repair or replace it.
Then go to Step 16.
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No
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Go to the next step.
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7
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VERIFY CURRENT INPUT SIGNAL STATUS OF FRONT HO2S
• Start the engine and warm it up completely.
• Access O2S11 (with P2187) or O2S21 (with P2189) PID using the WDS or equivalent.
• Check PID under following accelerator pedal condition (in PARK).
• Is PID reading normal?
- More than 0.45 V when accelerator pedal is suddenly depressed (rich condition). - Less than 0.45 V just after release of accelerator pedal (lean condition) |
Yes
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Go to the next step.
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No
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Visually inspect for any gas leakage between exhaust manifold and front HO2S.
• If there is no leakage, replace front HO2S
Then go to Step 16.
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8
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VERIFY CURRENT INPUT SIGNAL STATUS OF MAF SENSOR
• Connect the WDS or equivalent to the DLC-2.
• Start the engine.
• Access the MAF PID.
• Verify that the MAF PID changes quickly according to engine speed.
• Is the PID normal?
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Yes
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Go to the next step.
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No
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Replace MAF/IAT sensor, then go to Step 16.
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9
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INSPECT FOR EXCESSIVE AIR SUCTION OF INTAKE AIR SYSTEM
• Visually inspect for loosen, cracks or damages hoses on intake-air system.
• Is there any malfunction?
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Yes
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Repair or replace source of air suction, then go to Step 16.
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No
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Go to the next step.
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10
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INSPECT PURGE SOLENOID VALVE STUCK OPEN
• Turn the ignition switch off.
• Disconnect both hoses from purge solenoid valve.
• Blow air through purge solenoid valve.
• Does air blow through?
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Yes
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Replace purge solenoid valve.
Then go to Step 16.
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No
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Go to the next step.
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11
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INSPECT FUEL LINE PRESSURE
• Perform the "FUEL LINE PRESSURE INSPECTION".
• Is there any malfunction?
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Yes
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If fuel pressure is too high, replace fuel pump unit, then go to Step 16.
If fuel line pressure is low, go to the next step.
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No
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Go to Step 13.
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12
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INSPECT LEAKAGE FROM FUEL PUMP TO FUEL DELIVERY PIPE
• Visually inspect fuel line for any leakage.
• Is any fuel leakage found?
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Yes
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Replace suspected fuel line, then go to Step 16.
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No
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Inspect for foreign materials or stain inside fuel filter (low-pressure).
If for foreign materials or stain inside fuel filter (low-pressure), clean of fuel tank and filter.
Then go to Step 16.
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13
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INSPECT IGNITION SYSTEM
• Carry out spark test for right bank cylinders (with P2187) or left bank cylinders (with P2189).
(See Spark Test.)
• Is strong blue spark visible at each cylinder?
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Yes
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Go to the next step.
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No
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Repair or replace malfunctioning part according to spark test results, then go to Step 16.
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14
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INSPECT ENGINE COMPRESSION
• Inspect the engine compression for right bank cylinders (with P2187) or left bank cylinders (with P2189).
(See COMPRESSION INSPECTION [AJ].)
• Is there any malfunction?
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Yes
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Go to the next step.
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No
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Implement engine overhaul for repairs, then go to Step 16.
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15
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INSPECT FUEL INJECTOR OPERATION
• Remove fuel injector for right bank cylinders (with P2187) or left bank cylinders (with P2189).
• Inspect fuel injector (resistance, injection amount).
• Is fuel injector normal?
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Yes
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Go to the next step.
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No
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Replace suspected fuel injector, then go to the next step.
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16
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VERIFY TROUBLESHOOTING OF DTC P2187 AND P2189 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear DTC from PCM memory using WDS or equivalent.
• Perform the PCM Adaptive Memory Produce Drive MODE.
• Is the PENDING CODE same DTC present?
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Yes
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Replace PCM, then go to the next step.
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No
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Go to the next step.
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17
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VERIFY AFTER REPAIR PROCEDURE
• Perform "After Repair Procedure".
(See AFTER REPAIR PROCEDURE [AJ].)
• Are any DTCs present?
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Yes
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Go to the applicable DTC inspection.
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No
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Troubleshooting completed.
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