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

BME010300000W56

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 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 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
--- | --- | --- | ---
1 | Is squeal, click or chirp sound present? | Yes | Inspect engine oil level, solenoid valves installation or drive belt.
No | Go to next step.
2 | Is rumble or grind sound present? | Yes | Inspect drive belt tension or power steering system fluid level. If okay, perform power steering fluid line air bleed.
No | Go to next step.
3 | Is rattle sound present? | Yes | Inspect location of rattle for loose parts.
No | Go to next step.
4 | Is hiss sound present? | Yes | Inspect for vacuum leakage and intake-air system leakage.
No | Go to next step.
5 | Is rap or roar sound present? | Yes | Inspect exhaust system or loose parts.
No | Go to next step.
6 | 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
No | No DTC is displayed: Go to appropriate DTC test.
7 | Access ECT PID. Inspect ECT PID while warming up engine. Is PID value correct? | Yes | Go to next step.
No | Inspect ECT sensor and related wiring harnesses.
8 | Access IAT PID. Inspect IAT PID while running engine. Is PID value correct? | Yes | Go to next step.
No | Inspect IAT sensor and related wiring harnesses.
9 | Visually inspect CKP sensor and teeth of pulse wheel. Are CKP sensor and teeth of pulse wheel okay? | Yes | Go to next step.
No | Replace malfunctioning parts.
10 | 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.
No | Adjust CKP sensor position.
11 | 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
• MAP
• RPM
If PID value is not as specified, repair or replace malfunctioning parts.
If PID value is okay, go to next step.
No | Replace malfunctioning parts.
12 | Perform EGR system inspection. Is EGR system okay? | Yes | Go to next step.
No | Repair or replace malfunctioning part according to EGR system operation results.
13 | Remove parts necessary to inspect turbocharger.

  Note

  • Do not remove turbocharger.
Inspect if turbocharger compressor wheel is bent, damaged, or interfering with housing on vehicle.
Is there any problem?

Yes
Replace turbocharger.
No | Go to next step.
14 | Inspect if turbocharger compressor wheel locknut is loose or has fallen down inside turbocharger. Is there any problem? | Yes | Replace turbocharger.
No | Go to next step.
15 | Turn turbocharger compressor wheel by hand. Does wheel turn easily and smoothly? | Yes | Go to next step.
No | Replace turbocharger.
16 | Inspect if turbocharger turbine wheel is damaged, cracked or interfering with housing on vehicle.

  Note

  • Inspect all fins on each turbine wheel.
Is there any problem?

Yes
Replace turbocharger.
No | Go to next step.
17 | Is any engine oil found inside turbocharger turbine housing? | Yes | Excessive amount of oil is found: Replace turbocharger. Small amount of oil is found: Wipe oil off of vehicle, then go to next step.
No | Go to next step.
18 | Is any engine oil found inside turbocharger compressor housing? | Yes | Wipe oil off of vehicle, then go to next step.
No | Go to next step.
19 | Is any exhaust gas leakage found around location where turbocharger is attached to exhaust manifold? | Yes | Remove turbocharger. Inspect for cracks on center housing inlet surface. If cracks are found, replace turbocharger.
No | Go to 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 appropriate new bolts.
No | Turbocharger is okay. Install all parts removed in Step 13. Go to next step.
21 | Inspect fuel injector and fuel injector gasket. (See FUEL INJECTOR INSPECTION [MZR-CD (RF Turbo)].) Is fuel injector okay? | Yes | Inspect for following: • Metal flow • Bent connecting rod • Damaged valve seat • Incorrect valve clearance
No | Repair or replace as necessary.
22 | 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)].)