NO.13 KNOCKING/PINGING [MZR-CD (RF Turbo)]


13	KNOCKING/PINGING
DESCRIPTION	• Excessive shrilly knocking sound from engine.
POSSIBLE CAUSE	• Poor fuel quality • Air leakage from intake-air system • Intake-air system restriction • Variable swirl control (VSC) system malfunction • Variable boost control (VBC) system malfunction • Intake shutter valve stuck close • VSC valve stuck close • Glow system malfunction • Low engine compression • Improper valve timing • Low coolant temperature • Incorrect fuel injection timing • Erratic signal from CKP sensor • Erratic signal from CMP sensor • ECT sensor or related circuit malfunction • MAF/IAT sensor or related circuit malfunction • Boost sensor or related malfunction • Fuel pressure sensor or related circuit malfunction • Accelerator position sensor or related circuit malfunction • Excessive fuel pressure • Fuel injector malfunction • Fuel return line restriction • EGR system malfunction • Exhaust system and/or catalyst converter restriction • Turbocharger malfunction • Charge air cooler malfunction • Suction control valve malfunction (built-in supply pump) 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	Does engine run cold?	Yes	Go to symptom troubleshooting "NO.18 COOLING SYSTEM CONCERNS-RUNS COLD".
1	Does engine run cold?	No	Go to next step.
2	Inspect for following: • Fuel quality (e.g.: including water contamination, winter/summer blend) • Fuel return line clogging and/or restriction • Intake-air system restriction • Exhaust system and/or catalyst converter restriction • Charge air cooler condition (restriction or damaged) Are all items okay?	Yes	Go to next step.
2		No	Service as necessary. Repeat Step 2.
3	Connect WDS or equivalent to DLC-2. Access ECT PID. Verify ECT PID is above 80 °C {176 °F}?	Yes	Go to next step.
3		No	Inspect ECT PID.
4	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
4		No	No DTC is displayed: Go to next step.
5	Inspect intake shutter valve and VSC valve operations. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZR-CD (RF Turbo)].) Is there any problem?	Yes	Repair or replace as necessary.
5		No	Go to next step.
6	Inspect guide blade valve operation. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZR-CD (RF Turbo)].) Is there any problem?	Yes	Repair or replace as necessary.
6		No	Go to next step.
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. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZR-CD (RF Turbo)].) Is actuator okay?	Yes	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	Remove parts necessary to inspect turbocharger. Do not remove turbocharger. Inspect if turbocharger compressor wheel is bent, damaged, or interfering with housing on vehicle. (See TURBOCHARGER INSPECTION [MZR-CD (RF Turbo)].) Is there any problem?	Yes	Replace turbocharger.
9		No	Go to next step.
10	Inspect if turbocharger compressor wheel locknut is loose or has fallen down inside turbocharger. Is there any problem?	Yes	Replace turbocharger.
10		No	Go to next step.
11	Inspect turbocharger compressor wheel by hand. Does wheel turn easily and smoothly?	Yes	Go to next step.
11		No	Replace turbocharger.
12	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.
12		No	Go to next step.
13	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.
13		No	Go to next step.
14	Is any engine oil found inside turbocharger compressor hosing?	Yes	Wipe oil off of vehicle and install all removed parts in Step 10. Then, go to next step.
14		No	Turbocharger is okay. Install all parts removed in Step10. Then, go to next step.
15	Perform EGR system inspection. Is EGR system okay?	Yes	Go to next step.
15	Perform EGR system inspection. Is EGR system okay?	No	Repair or replace malfunctioning part according to EGR system operation results.
16	Inspect glow system operation. (See RELAY INSPECTION.) Is glow system operation normal?	Yes	Go to next step.
16		No	Repair or replace malfunctioning part according to glow system operation results.
17	Visually inspect CKP sensor and teeth of pulse wheel. Are CKP sensor and teeth of pulse wheel okay?	Yes	Go to next step.
17		No	Replace malfunctioning parts.
18	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.
18		No	Adjust CKP sensor position.
19	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.
19		No	Replace malfunctioning parts.
20	Is engine compression correct? (See COMPRESSION INSPECTION [MZR-CD (RF Turbo)].)	Yes	Go to next step.
20		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.
21	Inspect suction control valve. (See SUCTION CONTROL VALVE INSPECTION [MZR-CD (RF Turbo)].) Is suction control valve okay?	Yes	Go to next step.
21		No	Repair supply pump. (See SUPPLY PUMP INSPECTION [MZR-CD (RF Turbo)].)
22	Inspect fuel injector. (See FUEL INJECTOR INSPECTION [MZR-CD (RF Turbo)].) Is fuel injector okay?	Yes	Inspect following: • Boost sensor • MAF/IAT sensor • Fuel pressure sensor • Accelerator position sensor
22		No	Repair or replace as necessary.
23	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)].)