NO.11 ENGINE STALLS/QUITS, ENGINE RUNS ROUGH, MISSES, BUCK/JERK, HESITATION/STUMBLE, SURGES [MZR-CD (RF Turbo)]


11	ENGINE STALLS/QUITS, ENGINE RUNS ROUGH, MISSES, BUCK/JERK, HESITATION/STUMBLE, SURGES
DESCRIPTION	• Engine stops unexpectedly at beginning of acceleration or during cruise. • Engine stops unexpectedly while cruising. • Engine speed fluctuates during acceleration or cruising. • Engine misses during acceleration or cruising. • Vehicle bucks/jerks during acceleration, during or deceleration. • Momentary pause at beginning of acceleration or during acceleration. • Momentary minor irregularity in engine output.
POSSIBLE CAUSE	• Poor fuel quality • Glow system malfunction • Air leakage from intake-air system • Intake-air system restriction • Air cleaner restriction • Engine overheating • A/C system improper operation • Turbocharger malfunction • Variable swirl control (VSC) system malfunction • EGR system malfunction • Neutral switch or related circuit malfunction • Vacuum leakage • Fuel line restriction • Fuel filter clogging • Incorrect fuel injection timing • Erratic signal from CKP sensor • Erratic signal from CMP sensor • ECT sensor or related circuit malfunction • Boost sensor or related circuit malfunction • Accelerator position sensor or related circuit malfunction • MAF/IAT sensor or related circuit malfunction • IAT sensor No.2 or related circuit malfunction • Intermittent open or short circuit MAF sensor, accelerator position sensor, idle switch and VSS • Incorrect adjustment accelerator position sensor and/or idle switch • Incorrect idle speed • Inadequate fuel pressure • Fuel pressure sensor or related circuit malfunction • Suction control valve malfunction (built-in supply pump) • Fuel pressure limiter malfunction (built-in common rail) • Supply pump malfunction • Fuel injector malfunction • Low engine compression • Improper valve timing • Exhaust system and/or catalyst converter restriction • Clutch slippage • IDM or related circuit 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 injury or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete "BEFORE REPAIR PROCEDURE" and "AFTER REPAIR PROCEDURE" described in this manual.


STEP	INSPECTION	RESULTS	ACTION
1	Is idle speed stable?	Yes	Go to next step.
1	Is idle speed stable?	No	Go to symptom troubleshooting "NO.8 ENGINE RUNS ROUGH/ROLLING IDLE".
2	Is engine overheating?	Yes	Go to symptom troubleshooting "NO.17 COOLING SYSTEM CONCERNS-OVERHEATING".
2	Is engine overheating?	No	Go to next step.
3	Perform self-test function using WDS or equivalent. Turn engine switch to ON. Retrieve any DTC. Is DTC displayed?	Yes	DTC is displayed: Go to appropriate DTC test. Communication error message is displayed: Inspect for following: • Open circuit between PCM control relay and PCM terminal 53 or 79 • Open circuit PCM control relay and PCM terminal 69 • PCM control relay stuck open • Open or poor GND circuit (PCM terminal 65, 85, 103 or 104) • Poor connection vehicle body GND
3		No	No DTC is displayed: Go to next step.
4	Inspect for following: • Fuel quality (e.g.: including water contamination, winter/summer blend) • Fuel line/fuel filter clogging and/or restriction • Intake-air system restriction • Exhaust system and/or catalyst converter restriction Are all items okay?	Yes	Go to next step.
4		No	Service as necessary. Repeat Step 4.
5	Does engine run normal after warm-up?	Yes	Inspect glow system operation. (See RELAY INSPECTION.) Replace any malfunctioning part as necessary. If glow system is okay, go to next step.
5	Does engine run normal after warm-up?	No	Go to next step.
6	Note • The following test should be performed on the vehicles with A/C system. If the following test cannot be performed due to engine stalling, go to next step. • Go to next step for the vehicle without A/C system. Connect pressure gauge to A/C line. Turn blower and A/C switches on. Is pressure within specifications?	Yes	Go to next step.
6		No	A/C is always on: Go to symptom troubleshooting "NO.24 A/C ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUITY". Other symptoms: Inspect following: • Refrigerant charging amount • Main fan and/or additional fan operation
7	Inspect hose bands between following parts: • Turbocharger compressor housing and air cleaner • Turbocharger compressor housing and charge air cooler Are hose bands loose?	Yes	Retighten hose bands. If concern is resolved, complete inspection. If concern still exists, go to next step.
7		No	Go to next step.
8	Inspect for improper operation, kinks, clogging or disconnection on guide blade actuator. Is guide blade actuator okay?	Yes	Turbocharger is okay. Go to next step.
8		No	Repair or replace as necessary. If concern is resolved, complete inspection. If concern still exists, turbocharger is okay. Go to next step.
9	Perform EGR system inspection. Is EGR system okay?	Yes	Go to next step.
9	Perform EGR system inspection. Is EGR system okay?	No	Repair or replace malfunctioning part according to EGR system operation results.
10	Inspect idle speed. (See IDLE SPEED INSPECTION [MZR-CD (RF Turbo)].) Is idle speed correct?	Yes	Go to next step.
10		No	Repair or replace malfunctioning part according to idle speed inspection results.
11	Inspect adjustment of accelerator position sensor and idle switch. (See ACCELERATOR POSITION SENSOR INSPECTION [MZR-CD (RF Turbo)].) (See IDLE SWITCH INSPECTION [MZR-CD (RF Turbo)].) Are accelerator position sensor and idle switch adjusted correctly?	Yes	Go to next step.
11		No	Adjust accelerator position sensor and idle switch correctly. (See ACCELERATOR POSITION SENSOR ADJUSTMENT [MZR-CD (RF Turbo)].) (See IDLE SWITCH ADJUSTMENT [MZR-CD (RF Turbo)].)
12	Inspect adjustment of neutral switch. (See NEUTRAL SWITCH INSPECTION [MZR-CD (RF Turbo)].) Is neutral switch adjusted correctly?	Yes	Go to next step.
12		No	Adjust neutral switch correctly.
13	Visually inspect CKP sensor and teeth of pulse wheel. Are CKP sensor and teeth of pulse wheel okay?	Yes	Go to next step.
13		No	Replace malfunctioning parts.
14	Measure gap between CKP sensor and teeth of pulse wheel. Specification 1.5-2.5 mm {0.059-0.098 in} Is gap within specification?	Yes	Go to next step.
14		No	Adjust CKP sensor position.
15	Visually inspect CMP sensor and teeth of pulse wheel. Are CMP sensor and teeth of pulse wheel okay?	Yes	Inspect following PIDs: (See PCM INSPECTION [MZR-CD (RF Turbo)].) • ECT • IAT • MAF • RPM If PID value is not as specified, repair or replace malfunctioning parts. If PID value is okay, go to next step.
15		No	Replace malfunctioning parts.
16	Inspect fuel pressure sensor. (See FUEL PRESSURE SENSOR INSPECTION [MZR-CD (RF Turbo)].) Is fuel pressure okay?	Yes	Go to next step.
16		No	Replace common rail.
17	Inspect suction control valve. (See SUCTION CONTROL VALVE INSPECTION [MZR-CD (RF Turbo)].) Is suction control valve okay?	Yes	Go to next step.
17		No	Repair supply pump. (See SUPPLY PUMP INSPECTION [MZR-CD (RF Turbo)].)
18	Is engine compression correct? (See COMPRESSION INSPECTION [MZR-CD (RF Turbo)].)	Yes	Go to next step.
18		No	Inspect for following: • Damaged valve seat • Worn valve stem and valve guide • Worn or stuck piston ring • Worn piston, piston ring or cylinder • Improper valve timing Service as necessary.
19	Inspect fuel injector. (See FUEL INJECTOR INSPECTION [MZR-CD (RF Turbo)].) Is fuel injector okay?	Yes	Go to next step.
19		No	Repair or replace as necessary.
20	Inspect timing belt for following: • Chipping of gear teeth • Low tension • Breakage damage or cracks Is timing belt okay?	Yes	Inspect following: • Clutch slippage • CKP sensor • VSS If okay, remove and inspect supply pump and common rail.
20		No	If timing is incorrect, adjust valve timing. If timing belt is not okay, replace timing belt.
21	Verify test results. • If okay, return to diagnostic index to service any additional symptoms. • If malfunction remains, replace PCM. (See PCM REMOVAL/INSTALLATION [MZR-CD (RF Turbo)].)