NO.21 ENGINE NOISE [MZR-CD (RF Turbo)]


21	ENGINE NOISE
DESCRIPTION	• Engine noise under hood.
POSSIBLE CAUSE	• Engine internal damage • Timing belt displacement • Fuel injector malfunction • Loose attaching bolts or worn parts • Improper drive belt tension • Air leakage from intake-air system • Turbocharger operating noise • Solenoid valve operating noise • Improper injection timing • Erratic signal from CKP sensor • Erratic signal from CMP sensor • Fuel pressure sensor or related circuit malfunction • Boost sensor or related circuit malfunction • Accelerator pedal position sensor or related circuit malfunction • MAF/IAT sensor or related circuit malfunction • ECT sensor or related circuit malfunction • EGR system or malfunction • IAT sensor No.2 or related circuit malfunction • Vacuum leakage • Air leakage from intake-air system • Air in power steering fluid line 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 SERVICE PRECAUTION" and "AFTER SERVICE RECAUTION" described in this manual. (See BEFORE SERVICE PRECAUTION [MZR-CD (RF Turbo)].) (See AFTER SERVICE PRECAUTION [MZR-CD (RF Turbo)].) Note • The PCM checks the fuel injection amount during a set interval while idling, and automatically corrects it to maintain engine efficiency. It is normal that the engine noise and vibration might be a little louder during this process.


STEP	INSPECTION	RESULTS	ACTION
1	Is squeal, click or chirp sound present?	Yes	Inspect engine oil level, solenoid valves installation or the drive belt.
1	Is squeal, click or chirp sound present?	No	Go to the next step.
2	Is rumble or grind sound present?	Yes	Inspect the drive belt tension or the power steering system fluid level. If normal, perform the power steering fluid line air bleed.
2	Is rumble or grind sound present?	No	Go to the next step.
3	Is rattle sound present?	Yes	Inspect location of rattle for loose parts.
3	Is rattle sound present?	No	Go to the next step.
4	Is hiss sound present?	Yes	Inspect for vacuum leakage and intake-air system leakage.
4	Is hiss sound present?	No	Go to the next step.
5	Is rap or roar sound present?	Yes	Inspect the exhaust system or loose parts.
5	Is rap or roar sound present?	No	Go to the next step.
6	Perform self-test function using the WDS or equivalent. Turn the engine switch to the ON position. Retrieve any DTC. Is DTC displayed?	Yes	DTC is displayed: Go to the applicable DTC inspection. (See DTC TABLE [MZR-CD (RF Turbo)].) Communication error message is displayed: Inspect for the 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
6		No	No DTC is displayed: Go to the applicable DTC inspection. (See DTC TABLE [MZR-CD (RF Turbo)].)
7	Access ECT PID. Inspect ECT PID while warming up engine. Is PID value correct?	Yes	Go to the next step.
7		No	Inspect the ECT sensor and the related wiring harnesses.
8	Access IAT PID. Inspect IAT PID while running the engine. Is PID value correct?	Yes	Go to the next step.
8		No	Inspect the IAT sensor and the related wiring harnesses.
9	Visually inspect the CKP sensor and teeth of the pulse wheel. Are the CKP sensor and teeth of the pulse wheel normal?	Yes	Go to the next step.
9		No	Replace the malfunctioning parts.
10	Measure the gap between the CKP sensor and teeth of the pulse wheel. Specification 1.5-2.5 mm {0.059-0.098 in} Is the gap within the specification?	Yes	Go to the next step.
10		No	Adjust the CKP sensor position.
11	Visually inspect the CMP sensor and teeth of the pulse wheel. Are the CMP sensor and teeth of the pulse wheel normal?	Yes	Inspect the following PIDs: (See PCM INSPECTION [MZR-CD (RF Turbo)].) • ECT • IAT • MAF • MAP • RPM If PID value is not as specified, repair or replace the malfunctioning part. If PID value is normal, go to the next step.
11		No	Replace the malfunctioning part.
12	Perform the EGR system inspection. Is the EGR system normal?	Yes	Go to the next step.
12		No	Repair or replace the malfunctioning part according to the EGR system operation results.
13	Note • Do not remove turbocharger. Remove parts for easier access to inspect the turbocharger. Inspect if the turbocharger compressor wheel is bent, damaged, or interfering with housing on the vehicle. Is there any problem?	Yes	Replace the turbocharger.
13		No	Go to the next step.
14	Inspect if the turbocharger compressor wheel locknut is loose or has fallen down inside the turbocharger. Is there any problem?	Yes	Replace the turbocharger.
14		No	Go to the next step.
15	Turn the turbocharger compressor wheel by hand. Does the wheel turn easily and smoothly?	Yes	Go to the next step.
15		No	Replace the turbocharger.
16	Inspect if the turbocharger turbine wheel is damaged, cracked or interfering with housing on the vehicle. Note • Inspect all fins on each turbine wheel. Is there any problem?	Yes	Replace the turbocharger.
16		No	Go to the next step.
17	Is any engine oil found inside the turbocharger turbine housing?	Yes	Excessive amount of oil is found: Replace the turbocharger. Small amount of oil is found: Wipe off oil of the vehicle, then go to the next step.
17		No	Go to the next step.
18	Is any engine oil found inside the turbocharger compressor housing?	Yes	Wipe off oil of the vehicle, then go to the next step.
18		No	Go to the next step.
19	Is any exhaust gas leakage found around location where the turbocharger is attached to the exhaust manifold?	Yes	Remove the turbocharger. Inspect for cracks on center housing inlet surface. If cracks are found, replace the turbocharger.
19		No	Go to the next step.
20	Are any center housing and turbine housing attaching bolts loose?	Yes	Retighten loose bolts. If a bolt is found to be missing, attach the appropriate new bolts.
20		No	The turbocharger is normal. Install all parts removed in Step 13. Go to the next step.
21	Inspect the fuel injector and the fuel injector gasket. (See FUEL INJECTOR INSPECTION [MZR-CD (RF Turbo)].) Is the fuel injector normal?	Yes	Inspect for the following: • Metal flow • Bent connecting rod • Damaged valve seat • Incorrect valve clearance
21		No	Repair or replace if necessary.
22	Verify test results. • If normal, return to diagnostic index to service any additional symptoms. • If malfunction remains, replace the PCM. (See PCM REMOVAL/INSTALLATION [MZR-CD (RF Turbo)].)