NO.5 ENGINE STALLS-AFTER START/AT IDLE [MZR 2.0 DISI i-stop]
id0103d3801100
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ENGINE STALLS-AFTER START/AT IDLE |
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DESCRIPTION
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• Engine stops unexpectedly at idle or after start or both.
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POSSIBLE CAUSE
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• Poor fuel quality
• Air leakage from intake-air system
• Intake-air system restriction
• Electrical connector disconnection
• No battery power supply to PCM or poor ground
• Fuel leakage
• Vacuum leakage
• PCM DTC is stored.
• Engine overheating
• Improper operation of A/C system
• Improper operation of drive-by-wire control system
• EGR valve malfunction
• Purge solenoid valve malfunction
• Improper operation of variable valve timing control system
• Erratic signal from CMP sensor
• No signal from CKP sensor due to sensor, related wiring harness or wrong installation
• Erratic signal to PCM
• Exhaust system and/or TWC restriction or clogging
• Ignition system malfunction
• Ignition coil malfunction
• Inadequate fuel pressure (high or low pressure side)
• Incorrect fuel injection timing
• Fuel injector malfunction
• Low engine compression
• Improper valve timing
• PCV valve malfunction
• Injector driver (built-in PCM) malfunction
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Diagnostic procedure
STEP |
INSPECTION |
RESULTS |
ACTION |
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1
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Turn off the i-stop system.
Verify the symptom.
Is the symptom confirmed?
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Yes
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Go to the next step.
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No
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The cause of symptom is in the i-stop system.
• Perform the appropriate i-stop system symptom troubleshooting procedure.
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2
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Inspect for the following:
• Fuel quality (proper octane, contamination, winter/summer blend)
• Intake-air system leakage and restriction
• Electrical connectors
• Poor connection for PCM ground and body ground
• Fuel leakage
• Vacuum leakage
Is there any malfunction?
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Yes
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Service if necessary.
• Repeat this step.
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No
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Go to the next step.
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3
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Connect the M-MDS to the DLC-2.
Switch the ignition to ON (engine off).
Retrieve any DTCs using the M-MDS.
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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Go to the next step.
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4
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Access the ECT PID using the M-MDS.
Is the ECT PID value less than 116 °C {241 °F} during driving?
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Yes
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Go to the next step.
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No
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The cause of this concern could be from the cooling system overheating.
• Perform the symptom troubleshooting “NO.17 COOLING SYSTEM CONCERNS-OVERHEATING”.
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5
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Access the VPWR PID using the M-MDS.
Is the VPWR PID value B+?
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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 the wiring harness between main relay terminal C and PCM terminal 1BE and 1BF.
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6
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Perform the A/C Cut-off Control System Inspection.
Does the A/C cut-off operation work properly?
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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 the malfunctioning part according to the inspection results.
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7
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Will the engine run smoothly at part throttle?
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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 Step 9.
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8
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Perform the TP sweep inspection.
Does the drive-by-wire control system work properly?
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Yes
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Visually inspect the throttle body (damage/scratching).
• If normal:
• If not:
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No
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Inspect or replace the malfunctioning parts, according to the inspection results.
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9
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Inspect the engine condition while tapping the EGR valve housing.
Does the engine condition improve?
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Yes
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Replace the EGR valve.
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No
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Go to the next step.
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10
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Perform the Purge Control System Inspection.
Does the purge solenoid valve work properly?
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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 the malfunctioning parts according to the inspection results.
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11
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Perform the Variable Valve Timing Control System Operation Inspection.
Does the variable valve timing control system work properly?
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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 the malfunctioning parts according to the inspection results.
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12
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Inspect the CMP sensor and CKP sensor for the following:
• Installation condition
• Damaged trigger wheel and camshaft
• Open or short circuit in related circuit
Is there any malfunction?
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Yes
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Repair or replace the malfunctioning parts according to the inspection results.
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No
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Go to the next step.
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13
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Access the following PIDs using the M-MDS:
• APP
• ECT
• LONGFT1
• MAF
• O2S11
• O2S12
• SHTFT1
Do the PIDs indicate the correct values under the trouble condition?
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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 the malfunctioning parts according to the inspection results.
• If the malfunction remains:
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14
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Inspect for restriction in the exhaust system and the TWC.
Is there any restriction?
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Yes
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Repair or replace the malfunctioning parts according to the inspection results.
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No
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Go to the next step.
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15
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Perform the Spark Test.
Is a 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 the malfunctioning parts according to the inspection results.
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16
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Access the FUEL_PRES PID using the M-MDS.
Is the FUEL_PRES PID value within the specification?
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Yes
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Go to Step 21.
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No
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Go to the next step.
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17
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Is the vehicle accelerate performance normally?
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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 Step 19.
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18
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Inspect the fuel pressure sensor.
Is there any malfunction?
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Yes
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Replace the fuel delivery pipe.
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No
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Go to Step 21.
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19
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Switch the ignition to off.
Disconnect the high pressure fuel pump and PCM connectors.
Inspect for continuity between high pressure fuel pump terminal A (wiring harness-side) and body ground.
Is there continuity?
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Yes
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Repair or replace the wiring harness for a possible short to ground.
• If the malfunction remains:
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No
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Go to the next step.
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20
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Replace the high pressure fuel pump.
Access the FUEL_PRES PID using the M-MDS.
Is the FUEL_PRES PID value within the specification?
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Yes
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High pressure fuel pump or spill valve control solenoid valve (built-in high pressure pump) malfunction.
• Symptom troubleshooting is completed.
• Go to Step 25.
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No
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Relief valve (built-in fuel delivery pipe) malfunction.
• Replace the fuel delivery pipe.
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21
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Connect the fuel pressure gauge between the fuel pump and the high pressure fuel pump.
Measure the fuel pressure line of the low pressure side.
Is the fuel pressure within the specification?
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Yes
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Go to the next step.
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No
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Inspect for the following:
• Fuel line restriction
• Fuel filter clogging
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22
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Perform the Fuel Injector Operation Inspection.
Do the fuel injectors operate properly?
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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 the malfunctioning parts according to the inspection results.
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23
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Measure the compression pressure for each cylinder.
Are compression pressures within the specified?
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Yes
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Go to the next step.
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No
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Inspect for the following:
• Damaged valve seat
• Worn valve stem and valve guide
• Worn or stuck piston ring
• Worn piston, piston ring or cylinder
• Improper valve timing
Repair or replace the malfunctioning parts according to the inspection results.
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24
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Inspect the PCV valve.
Is there any malfunction?
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Yes
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Replace the PCV valve.
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No
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Injector driver is malfunction.
• Replace the PCM.
If the problem remains, overhaul the engine.
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25
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Verify the test results.
• If normal, return to the diagnostic index to service any additional symptoms. (See SYMPTOM DIAGNOSTIC INDEX [MZR 2.0 DISI i-stop].)
• If a malfunction remains, inspect the related Service Information and perform the repair or diagnosis.
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