NO.11 ENGINE STALLS/QUITS, ENGINE RUNS ROUGH, MISSES, BUCK/JERK, HESITATION/STUMBLE, SURGES [MZR 1.8, MZR 2.0, MZR 2.5]
id0103d4801700
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ENGINE STALLS/QUITS—ACCELERATION/CRUISE ENGINE RUNS ROUGH—ACCELERATION/CRUISE MISSES—ACCELERATION/CRUISE BUCK/JERK—ACCELERATION/CRUISE/DECELERATION HESITATION/STUMBLE—ACCELERATION SURGES—ACCELERATION/CRUISE |
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DESCRIPTION
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• Engine stops unexpectedly at beginning of acceleration or during acceleration.
• Engine stops unexpectedly while cruising.
• Engine speed fluctuates during acceleration or cruising.
• Engine misses during acceleration or cruising.
• Vehicle bucks/jerks during acceleration, cruising, or deceleration.
• Momentary pause at beginning of acceleration or during acceleration.
• Momentary minor irregularity in engine output.
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POSSIBLE CAUSE
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• Drive-by-wire control system operates with brake override system (from GH1***-429761,GH1***-442043,GH10**-206766,GH10**-210449,GH****-210421)
• Air cleaner restriction
• Clutch slippage (MTX)
• Electrical connector disconnection
• Poor fuel quality
• Ignition wiring malfunction
• Air leakage from intake air system
• Intake air system restriction
• Poor installation of EGR valve
• Improper operation of electronic throttle control system
• Vacuum leakage
• Engine mount installation looseness
• PCM DTC is stored
• Engine overheating
• Erratic signal to PCM
• CKP sensor and teeth of crankshaft pulley malfunction
• Spark plug malfunction
• Exhaust system part malfunction
• Excessive or insufficient fuel pressure
• Fuel leakage from fuel system
• Fuel injector malfunction
• Improper operation of A/C control system
• Improper operation of cruise control system
• A/F sensor malfunction
• Fuel shut-off valve malfunction
• Purge solenoid valve malfunction
• Evaporative emission control system malfunction
• CMP sensor and teeth of camshaft malfunction
• Improper operation of variable valve timing control system (MZR 2.0, MZR 2.5)
• Improper operation of EGR system
• Low engine compression
• Improper valve timing
• Check valve (two-way) malfunction
• PCV valve malfunction
• ATX internal malfunction (ATX)
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Diagnostic procedure
STEP |
INSPECTION |
RESULTS |
ACTION |
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1*1
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CONFIRM DRIVE-BY-WIRE CONTROL SYSTEM OPERATES WITH BRAKE OVERRIDE SYSTEM
• Perform the PCM DTC inspection using the M-MDS.
• Is the DTC P2299:00 present?
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Yes
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Go to the applicable DTC inspection. (drive-by-wire control system operates with brake override system.)
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No
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Go to the next step.
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2
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Inspect the following:
• Air cleaner element
• Clutch slippage (MTX)
• Electrical connections
• Fuel quality (such as proper octane, contamination, winter/summer blend)
• Ignition wiring
• No air leakage from intake air system
• No restriction of the intake air system
• Proper sealing of intake manifold and components attached to intake manifold: such as EGR valve
• Smooth operation of the throttle valve
• Vacuum connection
• Engine mount installation
Is there any malfunction?
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Yes
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Repair or replace the malfunctioning part according to the inspection results.
Repeat Step 2.
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No
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Go to the next step.
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3
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Perform the PCM DTC inspection 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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Is the engine overheating?
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Yes
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Go to the symptom troubleshooting “NO.17 COOLING SYSTEM CONCERNS-OVERHEATING”.
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No
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Go to the next step.
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5
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Access the following PIDs using the M-MDS:
• APP1
• APP2
• TP1
• TP2
• RPM
• MAF
• MAP
• BARO
• VPWR
• VSS
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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APP1, APP2 PIDs are not specified:
• Inspect if the output signal from the APP sensor changes smoothly.
TP1, TP2 PIDs are not specified:
• Inspect if the output signal from the TP sensor changes smoothly.
RPM PID is not specified:
• Inspect the CKP sensor and related wiring harness for vibration or an intermittent open/short circuit.
MAF PID is not specified:
• Inspect for an intermittent open circuit of the MAF sensor and the related wiring harness.
MAP PID is not specified:
• Inspect the MAP sensor and related wiring harness for vibration or an intermittent open/short circuit.
BARO PID is not specified:
• Replace the PCM.
VPWR PID is not specified:
• Inspect for an intermittent open circuit.
VSS PID is not specified:
• Inspect for an intermittent open circuit in the VSS and related wiring harness.
Repair or replace the malfunctioning part according to the inspection results.
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6
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Visually inspect the CKP sensor and teeth of the crankshaft pulley.
Is there any malfunction?
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Yes
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Repair or replace the malfunctioning part according to the inspection results.
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No
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Go to the next step.
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7
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Inspect the spark plug condition.
Is the spark plug wet, covered with carbon or grayish white?
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Yes
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Spark plug is wet or covered with carbon:
• Inspect for fuel leakage from fuel injector.
Spark plug is grayish white:
• Inspect the fuel injector for clogging.
Repair or replace the malfunctioning part according to the inspection results.
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No
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Install the spark plugs on original cylinders, then go to the next step.
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8
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Perform the Electronic Throttle Control System Inspection.
Is there any malfunction?
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Yes
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Repair or replace the malfunctioning part according to the inspection results.
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No
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Go to the next step.
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9
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Visually inspect the exhaust system part.
Is there any malfunction?
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Yes
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Repair or replace the malfunctioning part according to the inspection results.
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No
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Go to the next step.
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10
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Inspect the fuel line pressure.
Is there any malfunction?
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Yes
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Zero or low:
• Inspect the fuel pump relay and the fuel pump circuit.
(See RELAY INSPECTION.)
• Inspect the fuel line for clogging.
High:
• Replace the fuel pump unit.
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No
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Go to the next step.
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11
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Visually inspect for fuel leakage at the fuel injector O-ring and fuel line.
Is the fuel line pressure held after the ignition is off?
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Yes
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Go to the next step.
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No
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Inspect the fuel injector.
• If the fuel injector has malfunction:
• If the fuel injector is normal:
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12
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Connect the pressure gauges to the A/C low side and high side pressure lines.
Turn the A/C on and measure the low side and high side pressures.
Are the pressures within the specification?
(See REFRIGERANT PRESSURE CHECK.)
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Yes
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Go to the next step.
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No
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If the A/C is always on:
• Go to the symptom troubleshooting “NO.24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY”.
For other symptoms:
• Inspect the following:
• Repair or replace the malfunctioning part according to the inspection results.
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13
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Inspect the cruise control system.
Is there any malfunction?
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Yes
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Repair or replace the malfunctioning part according to the inspection results.
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No
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Go to the next step.
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14
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Inspect the A/F sensor.
Is there any malfunction?
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Yes
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Inspect for followings:
• Exhaust gas leakage between exhaust manifold and A/F sensor
• Loose installation of A/F sensor
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No
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Go to the next step.
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15
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Inspect the evaporative hose between the fuel tank and the purge solenoid valve.
Does the fuel flow into the evaporative hose?
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Yes
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Inspect the fuel shut-off valve.
Repair or replace the malfunctioning part according to the inspection results.
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No
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Go to the next step.
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16
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Disconnect the vacuum hose between the purge solenoid valve and the intake manifold from the purge solenoid valve side.
Plug the open end of the vacuum hose.
Switch the ignition to ON (engine off).
Is the engine stall now eliminated?
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Yes
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Inspect the following:
• Purge solenoid valve
• Evaporative emission control system
Repair or replace the malfunctioning part according to the inspection results.
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No
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Go to the next step.
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17
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Visually inspect the CMP sensor and teeth of the camshaft.
Is there any malfunction?
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Yes
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Repair or replace the malfunctioning part according to the inspection results.
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No
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MZR 1.8:
• Go to Step 19.
MZR 2.0, MZR 2.5:
• Go to the next step.
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18
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Perform the Variable Valve Timing Control System Operation Inspection.
Is there any malfunction?
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Yes
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Repair or replace the malfunctioning part according to the inspection results.
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No
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Go to the next step.
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19
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Perform the EGR Control System Inspection.
Is there any malfunction?
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Yes
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Repair or replace the malfunctioning part according to the inspection results.
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No
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Go to the next step.
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20
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Inspect the engine compression.
Is there any malfunction?
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Yes
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Repair or replace the malfunctioning part according to the inspection results.
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No
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Go to the next step.
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21
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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 and the oil separator as a single unit, then go to the next step.
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No
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Inspect the following:
• Valve timing
• Internal transaxle part
• EGR valve (mechanical stuck)
• Engine mounts
• Check valve (two-way)
Repair or replace the malfunctioning part according to the inspection results.
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22
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Verify test results.
• If normal, return to the diagnostic index to service any additional symptoms.
• If the malfunction remains, inspect the related Service Information and perform the repair or diagnosis.
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