NO.11 ENGINE STALLS/QUITS, ENGINE RUNS ROUGH, MISSES, BUCK/JERK, HESITATION/STUMBLE, SURGES [ZJ, ZY]

id0103b0801700

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
DESCRIPTION
•  The engine stops unexpectedly at beginning of acceleration or during acceleration.
•  The engine stops unexpectedly while cruising.
•  The engine speed fluctuates during acceleration or cruising.
•  The engine misses during acceleration or cruising.
•  The 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
•  Air cleaner restriction
•  Electrical connector disconnection
•  Poor fuel quality
•  Fuse malfunction
•  Ignition wiring malfunction
•  Air leakage from intake-air system
•  Intake-air system restriction
•  Improper operation of throttle valve
•  Vacuum leakage
•  Continuous memory DTC is stored
•  Engine overheating
•  Erratic signal from APP sensor
•  Erratic signal from CKP sensor
•  Erratic signal from TP sensor
•  Intermittent open or short circuit of APP sensor, MAF sensor, TP sensor and VSS
•  CKP sensor and teeth of the crankshaft pulley
•  Spark plug malfunction
•  Fuel leakage from fuel injector
•  Fuel injector clogged
•  Improper operation of drive-by-wire control system
•  Restriction in exhaust system
•  Inadequate fuel pressure
•  Pressure regulator (built-in fuel pump unit) malfunction
•  Improper operation of A/C system
•  Improper operation of air/fuel mixture ratio control
•  Check valve (two-way) malfunction
•  Purge solenoid valve malfunction
•  EVAP control system malfunction
•  CMP sensor and projections of the camshaft pulley malfunction
•  Improper operation of variable valve timing control system
•  EGR control system malfunction
•  Low engine compression
•  PCV valve malfunction
•  Clutch malfunction (MTX)
•  ATX malfunction (ATX)
•  Valve timing malfunction
•  PCM malfunction
Warning
The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before performing the fuel system services:
•  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 the “BEFORE SERVICE PRECAUTION” and “AFTER SERVICE PRECAUTION” described in this manual.
Caution
•  If there is foreign material on the connecting area of the quick release connector, it might damage the connector or fuel pipe. To prevent this, disconnect the connector and clean the connecting area before connecting.

Diagnostic procedure

STEP

INSPECTION

ACTION
1
Inspect the following:
•  Air cleaner element
•  Electrical connections
•  Fuel quality (such as proper octane, contamination, winter/summer blend)
•  Ignition wiring
•  No air leakage from the intake-air system
•  No restriction of the intake-air system
•  Proper sealing of the intake manifold and components attached to the intake manifold: such as the EGR valve
•  Smooth operation of throttle valve
•  Vacuum connection
Is there any malfunction?
Yes
Repair or replace the malfunctioning part according to the inspection results.
Repeat Step 1.
No
Go to the next step.
2
Connect the M-MDS to the DLC-2.
If the engine stalls:
•  Perform the KOEO self test.
If the engine does not stall:
•  Perform the KOEO/KOER self test.
Are any continuous memory DTCs present?
Yes
Go to the appropriate DTC inspection.
(See DTC TABLE [ZJ, ZY].)
No
Go to the next step.
3
Is the engine overheating?
Yes
Go to the symptom troubleshooting “NO.17 COOLING SYSTEM CONCERNS-OVERHEATING”.
(See NO.17 COOLING SYSTEM CONCERNS-OVERHEATING [ZJ, ZY].)
No
Go to the next step.
4
Connect the M-MDS to the DLC-2.
Perform the PID/DATA Monitor and Record Procedure and access the following PIDs:
(See ON-BOARD DIAGNOSTIC TEST [ZJ, ZY].)
•  APP
•  MAF
•  RPM
•  TP1, TP2, TP REL
•  VPWR
•  VSS
Monitor the each PID while driving the vehicle.
Are the PIDs normal?
(See PCM INSPECTION [ZJ, ZY].)
Yes
Go to the next step.
No
APP:
•  Inspect if output signal from APP sensor changes smoothly.
MAF:
•  Inspect for open circuit of the MAF sensor and related wiring harness intermittently.
RPM:
•  Inspect the CKP sensor and related harness for such as vibration, intermittent open/short circuit.
TP1, TP2, TP REL:
•  Inspect if output signal from the TP sensor changes smoothly.
VPWR:
•  Inspect for open circuit intermittently.
VSS:
•  Inspect for open circuit of the VSS and related wire harness intermittently (ATX with ABS).
•  Inspect the ABS or DSC system. (MTX with ABS).
Repair or replace the malfunctioning part according to the inspection results.
5
Visually inspect the CKP sensor and teeth of the crankshaft pulley.
Is there any malfunction?
Yes
Repair or replace the malfunctioning part according to the inspection results.
No
Go to the next step.
6
Measure the gap between the CKP sensor and teeth of the crankshaft pulley.
Specification
0.5—1.5 mm {0.02—0.05 in}
Is the gap within the specification?
Yes
Go to the next step.
No
Replace the crankshaft pulley.
7
Inspect the spark plug conditions.
(See SPARK PLUG INSPECTION [ZJ, ZY].)
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 the fuel injector.
Spark plug is grayish white:
•  Inspect for clogged the fuel injector.
Repair or replace the malfunctioning part according to the inspection results.
No
Install the spark plugs on original cylinders.
Go to the next step.
8
Perform the Drive-by-wire Control System Inspection.
(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [ZJ, ZY].)
Does the throttle body operate properly?
Yes
Go to the next step.
No
Repair or replace the malfunctioning part according to the inspection results.
9
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.
10
Install the fuel pressure gauge between the fuel pipe and the fuel distributor.
Connect the M-MDS to the DLC-2.
Perform the Active Command Modes Procedure and turn On the fuel pump using the FP PID.
(See ON-BOARD DIAGNOSTIC TEST [ZJ, ZY].)
Is the fuel line pressure correct?
(See FUEL LINE PRESSURE INSPECTION [ZJ, ZY].)
Yes
Go to the next step.
No
Zero or low:
•  Inspect the fuel pump relay and the fuel pump unit related wiring harness.
•  If the wiring harness is normal:
―  Replace the fuel pump unit.
•  If the wiring harness has a malfunction:
―  Repair or replace the suspected wiring harness.
High:
•  Replace the fuel pump unit.
11
Visually inspect for fuel leakage at the fuel injector O-ring and fuel line.
Is the fuel line pressure held after the FP PID is turned Off?
(See REFRIGERANT PRESSURE CHECK.)
Yes
Go to the next step.
No
Replace the fuel pump unit.
(See FUEL PUMP UNIT REMOVAL/INSTALLATION [ZJ, ZY].)
12
Note
•  Following test is for engine stalling with the A/C on. If other symptom exists, go to the next step.
Connect the pressure gauge to the A/C low and high pressure side lines.
Turn the A/C on and measure low side and high side pressure.
Are the pressure within the specifications?
(See REFRIGERANT PRESSURE CHECK.)
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”.
For other symptoms:
•  Inspect the following:
―  Refrigerant charging amount
―  Condenser fan operation
•  Repair or replace the malfunctioning part according to the inspection results.
13
Connect the M-MDS to the DLC-2.
Start the engine and idle it.
Perform the PID/DATA Monitor and Record Procedure and access the O2S11 PID.
(See ON-BOARD DIAGNOSTIC TEST [ZJ, ZY].)
Is the O2S11 PID normal?
(See PCM INSPECTION [ZJ, ZY].)
•  Less than 1 mA when the accelerator pedal is suddenly depressed: rich condition
•  More than 1 mA during fuel cut: lean condition
Yes
Go to the next step.
No
Inspect the A/F sensor, related wiring harness, connector and terminals.
(See AIR FUEL RATIO (A/F) SENSOR INSPECTION [ZJ, ZY].)
Repair or replace the malfunctioning part according to the inspection results, if necessary.
(See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [ZJ, ZY].)
Go to the next step.
14
Inspect the evaporative purge hose between the fuel tank and purge solenoid valve.
Does the fuel flow into the evaporative purge hose?
Yes
Inspect the check valve (two-way).
(See FUEL TANK INSPECTION [ZJ, ZY].)
No
Go to the next step.
15
Disconnect the vacuum hose between the purge solenoid valve and the intake manifold from the purge solenoid valve side.
Plug the opening end of the vacuum hose.
Drive the vehicle.
Does the engine condition improve?
Yes
Inspect the purge solenoid valve (stuck open mechanically).
(See PURGE SOLENOID VALVE INSPECTION [ZJ, ZY].)
Inspect the EVAP control system.
Repair or replace the malfunctioning part according to the inspection results, if necessary.
No
Go to the next step.
16
Visually inspect the CMP sensor and projections of the camshaft pulley.
Is there any malfunction?
Yes
Repair or replace the malfunctioning part according to the inspection results, if necessary.
No
Go to the next step.
17
Perform the Variable Valve Timing Control System Operation Inspection.
(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [ZJ, ZY].)
Is there any malfunction?
Yes
Repair or replace the malfunctioning part according to the inspection results.
No
Go to the next step.
18
Perform the EGR Control System Inspection.
(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [ZJ, ZY].)
Is there any malfunction?
Yes
Repair or replace the malfunctioning part according to the inspection results.
No
Go to the next step.
19
Inspect the engine compression.
(See COMPRESSION INSPECTION [ZJ, ZY].)
Is there any malfunction?
Yes
Inspect for cause.
No
Go to the next step.
20
Inspect the PCV valve operation.
(See POSITIVE CRANKCASE VENTILATION (PCV) VALVE INSPECTION [ZJ, ZY].)
Is there any malfunction?
Yes
Replace the PCV valve and the oil separator as a single unit.
(See PURGE SOLENOID VALVE REMOVAL/INSTALLATION [ZJ, ZY].)
No
Inspect the following:
•  Check valve (two-way)
•  Clutch (MTX)
•  Engine mounts
•  Internal transaxle part (ATX)
•  Valve timing
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.
•  If malfunction remains, inspect related Service information perform repair or diagnosis.
―  f vehicle repaired, troubleshooting completed.
―  If vehicle not repaired or additional diagnostic information not available, replace the PCM.