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NO.23 ENGINE NOISE [MZR-CD (RF Turbo)]

id0103f1822100

23 | ENGINE NOISE
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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 • Incorrect 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 (APP) 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 • Suction control valve malfunction (built-in supply pump) • Air leakage from intake-air system • Air in power steering fluid line • Turbocharger operating noise • Solenoid valve operating noise • Fuel injection learning improper 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. Note • PCM checks fuel injection amount during a set interval while idling, and automatically corrects it to maintain engine efficiency. It is normal that engine noise and vibration might be a little louder during this process.

Diagnostic Procedure

STEP | INSPECTION | RESULTS | ACTION
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1 | Is there a squeal, click or chirp sound present? | Yes | Inspect the engine oil level, solenoid valve installation or the drive belt.
No | Go to the next step.
2 | Is there a rumble or grind sound present? | Yes | Inspect the drive belt tension or the power steering system fluid level. If normal, perform power steering fluid line air bleed.
No | Go to the next step.
3 | Is there a rattle sound present? | Yes | Inspect the location of the rattle for loose parts.
No | Go to the next step.
4 | Is there a hiss sound present? | Yes | Inspect for vacuum leakage and intake-air system leakage.
No | Go to the next step.
5 | Is there a rap or roar sound present? | Yes | Inspect the exhaust system for loose parts.
No | Go to the next step.
6 | Perform the self-test function using the WDS or equivalent. Turn the engine switch to the ON position. Retrieve any DTCs. Are any DTCs displayed? | Yes | DTC is displayed: Go to the appropriate DTC test. (See DTC TABLE [MZR-CD (RF Turbo)].) Communication error message is displayed: Inspect the following: • Open circuit between PCM control relay and PCM terminal 119 or 120 • Open circuit PCM control relay and PCM terminal 105 • PCM control relay stuck open • Open or poor ground circuit (PCM terminal 1, 2, 3, 114 or 117) • Poor connection to vehicle body ground
No | No DTC is displayed: Go to the appropriate DTC test. (See DTC TABLE [MZR-CD (RF Turbo)].)
7 | Access the ECT PID. Inspect the ECT PID while warming up the engine. Is the PID value correct? | Yes | Go to the next step.
No | Inspect the ECT sensor and the related wiring harnesses.
8 | Access the IAT PID. Inspect the IAT PID while running the engine. Is the PID value correct? | Yes | Go to the next step.
No | Inspect the IAT sensor and the related wiring harnesses.
9 | Visually inspect the CKP sensor and the teeth of the pulse wheel. Are the CKP sensor and the teeth of the pulse wheel normal? | Yes | Go to the next step.
No | Replace malfunctioning parts.
10 | Measure the gap between the CKP sensor and the teeth of the pulse wheel. Specification 1.5-2.5 mm {0.059-0.098 in} Is the gap within specification? | Yes | Go to the next step.
No | Adjust the CKP sensor position.
11 | Visually inspect the CMP sensor and the teeth of the pulse wheel. Are the CMP sensor and the teeth of the pulse wheel normal? | Yes | Inspect the following PIDs: (See PCM INSPECTION [MZR-CD (RF Turbo)].) • ECT • IAT • MAF • MAP • RPM If the PID value is not as specified, repair or replace malfunctioning parts. If the PID value is normal, go to the next step.
No | Replace malfunctioning parts.
12 | Perform the EGR system inspection. Is the EGR system normal? | Yes | Go to the next step.
No | Repair or replace the malfunctioning part according to EGR system operation results.
13 | Remove parts necessary to inspect the turbocharger. Note • Do not remove the turbocharger. Inspect if the turbocharger compressor wheel is bent, damaged, or interfering with housing on vehicle. Is there any malfunction? | Yes | Replace the turbocharger.
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 malfunction? | Yes | Replace turbocharger.
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.
No | Replace the turbocharger.
16 | Inspect if the turbocharger turbine wheel is damaged, cracked or interfering with the housing on vehicle. Note • Inspect all fins on each turbine wheel. Is there any malfunction? | Yes | Replace the turbocharger.
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 oil off of the vehicle, then go to the next step.
No | Go to the next step.
18 | Is any engine oil found inside the turbocharger compressor housing? | Yes | Wipe oil off of the vehicle, then go to the next step.
No | Go to the next step.
19 | Is any exhaust gas leakage found around the location where the turbocharger is attached to the exhaust manifold? | Yes | Remove the turbocharger. Inspect for cracks on the center housing inlet surface. If cracks are found, replace the turbocharger.
No | Go to the next step.
20 | Are any center housing and turbine housing attaching bolts loose? | Yes | Retighten the loose bolts. If a bolt is found to be missing, attach appropriate new bolts.
No | Turbocharger is normal. Install all parts removed in Step 13. Go to the next step.
21 | Inspect the suction control valve. (See SUCTION CONTROL VALVE INSPECTION [MZR-CD (RF Turbo)].) Is the suction control valve normal? | Yes | Go to the next step.
No | Replace the supply pump. (See SUPPLY PUMP REMOVAL/INSTALLATION [MZR-CD (RF Turbo)].)
22 | Inspect the fuel injector and fuel injector gasket. (See FUEL INJECTOR INSPECTION [MZR-CD (RF Turbo)].) Is the fuel injector normal? | Yes | Inspect the following: • Metal flow • Bent connecting rod • Damaged valve seat • Incorrect valve clearance If they are normal, perform fuel injection learning. (See Injection amount correction.)
No | Repair or replace if necessary. (See FUEL INJECTOR REMOVAL/INSTALLATION [MZR-CD (RF Turbo)])
23 | Verify test results. • If normal, return to the diagnostic index to service any additional symptoms. (See SYMPTOM DIAGNOSTIC INDEX [MZR-CD (RF Turbo)].) • If the malfunction remains, inspect the related Service Information and perform repair or diagnosis. - If the vehicle is repaired, troubleshooting completed. - If the vehicle is not repaired or additional diagnostic information is not available, reprogram the PCM if later calibration is available. Retest.