NO.11 ENGINE STALLS/QUITS, ENGINE RUNS ROUGH, MISSES, BUCK/JERK, HESITATION/STUMBLE, SURGES [MZI-3.7]

id0103d2801700

11 | 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 | • 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.
POSSIBLE CAUSE | • Drive-by-wire control system operates with brake override system. • Vacuum leakage • Air cleaner restriction • Air leakage from intake-air system parts • Intake air system restriction • Poor fuel quality • Disconnected electrical system connector • Loose attaching bolts or worn engine mounts • PCM DTC is stored. • Engine overheating • Throttle body restriction or clogged • Erratic signal to PCM ― APP sensor or related circuit malfunction ― TP sensor or related circuit malfunction ― CKP sensor or related circuit malfunction ― MAF sensor or related circuit malfunction ― TP sensor or related circuit malfunction ― Battery or related circuit malfunction ― VSS or related circuit malfunction • Erratic signal from CKP sensor • Fuel leakage from fuel injector • Fuel injector clogging • Improper operation of drive-by-wire control system • Restriction in exhaust system • Inadequate fuel pressure ― Intermittent open or short circuit in fuel pump circuit ― Fuel pump mechanical malfunction ― Fuel line restriction or clogging ― Pressure regulator malfunction (built-in fuel pump unit) • Fuel leakage from fuel system • Improper A/C system operation • Improper operation of cruise control system • Improper air/fuel mixture ratio control operation • A/F sensor or related circuit malfunction • PCV valve malfunction • Check valve (two-way) malfunction integrated with fuel tank • Purge solenoid valve malfunction • Fuel flow into evaporative purge hose • Erratic signal or no signal from CMP sensor • Low engine compression • Improper valve timing due to jumping out timing chain • ATX malfunction 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 injuries 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. (See BEFORE SERVICE PRECAUTION [MZI-3.7].)(See AFTER SERVICE PRECAUTION [MZI-3.7].) Caution • Disconnecting/connecting quick release connector without cleaning it may cause damage to fuel pipe and quick release connector. Always clean quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material.

Diagnostic procedure

STEP | INSPECTION | RESULTS | ACTION
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1 | Retrieve any PCM DTCs using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [MZI-3.7].) Is the DTC P2299:00 displayed? | Yes | Go to the appropriate DTC inspection. (Drive-by-wire control system operates with brake override system.) (See DTC P2299:00 [MZI-3.7].)
No | Go to the next step.
2 | Verify the following: • Vacuum connection • Air cleaner element • No air leakage from intake-air system • No restriction of intake-air system • Proper sealing of intake manifold and components attached to intake manifold • Ignition wiring • Fuel quality (such as proper octane, contamination, winter/summer blend) • Electrical connections • Smooth operation of throttle valve • Engine mount installation Are all items normal? | Yes | Go to the next step.
No | Repair or replace the malfunctioning part according to the inspection results. Repeat Step 2.
3 | Turn the ignition switch to the ON position (Engine off). Retrieve any PCM DTCs using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [MZI-3.7].) Are there any DTCs displayed? | Yes | DTC is displayed: • Go to the appropriate DTC inspection. (See DTC TABLE [MZI-3.7].)
No | No DTC is displayed: • Go to the next step.
4 | Is the engine overheating? | Yes | Go to the symptom troubleshooting “NO.17 COOLING SYSTEM CONCERNS-OVERHEATING”. (See NO.17 COOLING SYSTEM CONCERNS-OVERHEATING [MZI-3.7].)
No | Go to the next step.
5 | Visually inspect the throttle valve. Are any foreign materials adhere to around throttle valve? | Yes | Clean the throttle valve.
No | Go to the next step.
6 | Caution • While performing this step, always operate the vehicle in a safe and lawful manner. • When the M-MDS is used to observe monitor system status while driving, be sure to have another technician with you, or record the data in the M-MDS using the PID/DATA MONITOR AND RECORD capturing function and inspect later. Access the following PCM PIDs and VSS using the M-MDS: (See ON-BOARD DIAGNOSTIC TEST [MZI-3.7].) • APP1 • APP2 • RPM • VPWR • TP1 • TP2 • MAF • VSS Monitor each PID while driving the vehicle. Do the PIDs indicate the correct values under trouble condition? (See PCM INSPECTION [MZI-3.7].) | Yes | Go to the next step.
No | APP1, APP2 PID is not normal: • Inspect if output signal from APP sensor changes smoothly. RPM PID is not normal: • Inspect the CKP sensor and related wiring harness for vibration or intermittent open/short circuit. VPWR PID is not normal: • Inspect for open circuit intermittently. TP1 or TP2 PID is not normal: • Inspect if output signal from TP sensor changes smoothly. MAF PID is not normal: • Inspect for open circuit of the MAF sensor and related wiring harness intermittently. VSS PID is not normal: • Inspect for open circuit of VSS and related wiring harness intermittently. Repair or replace the malfunctioning part according to the inspection results.
7 | Inspect the CKP sensor. (See CRANKSHAFT POSITION (CKP) SENSOR INSPECTION [MZI-3.7].) Is the CKP sensor normal? | Yes | Go to the next step.
No | Repair or replace the malfunctioning part according to the inspection results.
8 | Verify the spark plug conditions. Is the spark plug wet, covered with carbon or grayish white? | Yes | 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.
No | Install the spark plugs on original cylinders. Go to the next step.
9 | Perform the drive-by-wire control system operation inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZI-3.7].) Does the drive-by-wire control system function properly? | Yes | Go to the next step.
No | Repair or replace the malfunctioning part according to the inspection results.
10 | Visually inspect the exhaust system part. Is there any deformed exhaust system part? | Yes | Repair or replace the malfunctioning part according to the inspection results.
No | Go to the next step.
11 | Inspect the fuel line pressure. (See FUEL LINE PRESSURE INSPECTION [MZI-3.7].) Is the fuel line pressure correct? | Yes | Go to the next step.
No | Zero or low: • Inspect the following: ― Fuel pump relay ― Fuel pump circuit ― Fuel line for clogging • If there is no malfunction, replace the fuel pump unit. (Fuel pump or pressure regulator malfunction) (See FUEL PUMP UNIT REMOVAL/INSTALLATION [MZI-3.7].) High: • Replace the fuel pump unit. (Pressure regulator malfunction) (See FUEL PUMP UNIT REMOVAL/INSTALLATION [MZI-3.7].)
12 | Visually inspect for fuel leakage at fuel injector, O-ring, and fuel line. Is there any fuel leakage? | Yes | Repair or replace the malfunctioning part according to the inspection results.
No | Go to the next step.
13 | Note • The following test is for stall concerns with the A/C on. If other symptoms exist, go to the next step. Connect the pressure gauges to A/C low and high pressure side lines. Turn the A/C on and measure low side and high side pressures. (See REFRIGERANT PRESSURE CHECK.) Are pressures within specifications? | Yes | Go to the next step.
No | 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”. (See NO.24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY [MZI-3.7].) For other symptoms: • Inspect the following: ― Refrigerant charging amount ― Condenser fan operation • Repair or replace the malfunctioning part according to the inspection results.
14 | Note • The following test should be performed for symptom with cruise control ON. If other symptoms exist, go to the next step. Inspect the cruise control system operation. Is the cruise control system normal? | Yes | Go to the next step.
No | Repair or replace the malfunctioning part according to the inspection results.
15 | Inspect the A/F sensor. (See AIR FUEL RATIO (A/F) SENSOR INSPECTION [MZI-3.7].) Is there any malfunction? | Yes | Replace the A/F sensor. (See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [MZI-3.7].)
No | Go to the next step.
16 | Note • The PCV valve cannot be reassembled once it is removed because the tabs will have bee n broken. Inspect the PCV valve without removing it from the vehicle. Inspect the PCV valve with it installed. (See POSITIVE CRANKCASE VENTILATION (PCV) VALVE INSPECTION [MZI-3.7].) Is the PCV valve normal? | Yes | Go to the next step.
No | Replace the PCV valve. (See POSITIVE CRANKCASE VENTILATION (PCV) VALVE REMOVAL/INSTALLATION [MZI-3.7].)
17 | Inspect the evaporative purge hose between fuel tank and purge solenoid valve. Does the fuel flow into evaporative purge hose? | Yes | Inspect the check valve (two-way). (See FUEL TANK INSPECTION [MZI-3.7].) Repair or replace the malfunctioning part according to the inspection results.
No | Go to the next step.
18 | Disconnect the vacuum hose between purge solenoid valve and intake manifold from purge solenoid side. Plug opening end of vacuum hose. Drive the vehicle. Does the engine condition improve? | Yes | Inspect the following: • If purge solenoid valve is stuck open. • EVAP control system Repair or replace the malfunctioning part according to the inspection results.
No | Go to the next step.
19 | Inspect the CMP sensor. (See CAMSHAFT POSITION (CMP) SENSOR INSPECTION [MZI-3.7].) Is the CMP sensor normal? | Yes | Go to the next step.
No | Repair or replace the malfunctioning part according to the inspection results.
20 | Is the engine compression correct? | Yes | Inspect the following: • Valve timing • Internal transaxle part • Engine mounts • Check valve (two-way) Repair or replace the malfunctioning part according to the inspection results.
No | Inspect for cause. Repair or replace the malfunctioning part according to the inspection results.
21 | • Verify test results. ― If normal, return to diagnostic index to service any additional symptoms. (See SYMPTOM DIAGNOSTIC INDEX [MZI-3.7].) ― If malfunction remains, inspect related Service Information and perform repair or diagnosis. • If vehicle is repaired, troubleshooting completed. • If vehicle is not repaired or additional diagnostic information is not available, replace the PCM. (See PCM REMOVAL/INSTALLATION [MZI-3.7].)