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NO.12 LACK/LOSS OF POWER-ACCELERATION/CRUISE [L3 Turbo]

id0103b4804800

12 | LACK/LOSS OF POWER - ACCELERATION/CRUISE
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DESCRIPTION | Performance is poor under load (e.g., powers down when climbing hills).
POSSIBLE CAUSE | • Improper A/C system operation • Improper operation of A/C cut-off control • Air leakage or restriction from intake-air system • Loose turbocharger compressor-to-intake manifold duct connecting • Turbocharger rotating assembly binding or dragging • Wastegate valve malfunction (stuck open) • Turbocharger malfunction • Charge air cooler malfunction • Variable swirl system malfunction • Improper operation of electronic throttle control system • Purge solenoid valve malfunction • EGR system malfunction • Brake dragging • Low engine compression • Poor fuel quality • Vacuum leakage • Incorrect signal to ignition coil • Spark plug malfunction • Engine overheating • Throttle body malfunction • Air cleaner restriction or dirty • PCV valve malfunction • Improper valve timing due to jumping out of timing chain • Improper operation of variable valve timing control system • Restriction in exhaust system or three-way catalytic converter (TWC) • Leakage at exhaust manifold or turbocharger mounting flange • Intermittent open or short fuel pump related circuit • Inadequate fuel pressure (high-or low pressure side) • Fuel pressure sensor or related circuit malfunction • Suction control valve or related circuit malfunction (built-in high pressure fuel pump) • Relief valve malfunction (built-in delivery pipe) • High pressure fuel pump malfunction • Improper fuel pump speed control operation • Fuel pump mechanical malfunction • Fuel line restriction or clogging • Fuel injector malfunction • Incorrect fuel injection timing • Erratic signal from CKP sensor • Erratic or no signal from CMP sensor • ECT sensor or related circuit malfunction • Manifold absolute pressure (MAP) 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, TP sensor and VSS • Clutch slippage • Injector driver module 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 ROCEDURE" and "AFTER REPAIR PROCEDURE" described in this manual. (See BEFORE SERVICE PRECAUTION [L3 Turbo].) (See AFTER SERVICE PRECAUTION [L3 Turbo].) Caution • Disconnecting/connecting the quick release connector without cleaning it may possibly cause damage to the fuel pipe and quick release connector. Always clean the quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material.

Diagnostic procedure

STEP | INSPECTION | RESULTS | ACTION
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1 | Verify the following: • Fuel quality (proper octane, contamination, winter/summer blend) • Air cleaner restriction or dirty • Intake-air system restriction or leakage • Charge air cooler condition (restriction or damaged) • Turbocharger compressor-to-intake manifold duct loose connection • Leakage at exhaust manifold or turbocharger mounting flange • Vacuum leakage • Clutch slippage • Brake dragging Are all items normal? | Yes | Go to the next step.
No | Service if necessary. Repeat Step 1.
2 | Perform the self-test function using the WDS or equivalent. Turn the ignition switch to the ON position. Retrieve any DTCs. Is a DTC displayed? | Yes | DTC is displayed: Go to the appropriate DTC test. (See DTC TABLE [L3 Turbo].)
No | No DTC is displayed: Go to the next step.
3 | Is the engine overheating? | Yes | Go to symptom troubleshooting "NO.17 COOLING SYSTEM CONCERN-OVERHEATING." (See NO.17 COOLING SYSTEM CONCERNS-OVERHEATING [L3 Turbo].)
No | Go to the next step.
4 | Perform the EGR system operation inspection. (See EGR Control System Inspection.) Does the EGR system operate properly? | Yes | Go to the next step.
No | Inspect or replace the malfunctioning parts, according to the inspection results.
5 | Perform the A/C Cut-off Operation Inspection. (See A/C Cut-off Control System Inspection.) Does the A/C Cut-off Operation work properly? | Yes | Go to the next step.
No | Repair or replace malfunctioning parts, according to the inspection results.
6 | Perform the TP sweep inspection. (See Electronic Throttle Control System Inspection.) Does the variable swirl system work properly? | Yes | Visually inspect throttle body (damaged/scratching.) If normal, go to the next step.
No | Inspect or replace the malfunctioning parts, according to the inspection results.
7 | Perform the Variable Swirl Control System Operation Inspection. (See Variable Swirl System Operation Inspection.) | Yes | Go to the next step.
No | Inspect or replace the malfunctioning parts, according to the inspection results.
8 | Perform the Variable Valve Timing Control System Operation Inspection. (See Variable Valve Timing Control System Operation Inspection.) Does the variable valve timing control system work properly? | Yes | Go to the next step.
No | Inspect or replace the malfunctioning parts, according to the inspection results.
9 | Perform the Purge Control System Operation Inspection. (See Purge Control System Inspection.) Does the purge control system work properly? | Yes | Go to the next step.
No | Inspect or replace the malfunctioning parts, according to the inspection results.
10 | Perform Fuel Pump Speed Control Inspection. (See Fuel Pump Speed Control Inspection.) Does the fuel pump speed control work properly? | Yes | Go to the next step.
No | Inspect or replace the malfunctioning parts, according to the inspection results.
11 | Perform the Wastegate Control System Operation Inspection. (See Wastegate Control System Operation Inspection.) Does the wastegate control system work properly? | Yes | Go to the next step.
No | Inspect or replace the malfunctioning parts, according to the inspection results.
12 | Connect the WDS or equivalent to DLC-2. Access and monitor following PIDs using the data monitor function. • ECT • MAF • IAT • IAT2 • APP • TP • MAP • FP (Low side pressure line) • VSS Do the PIDs indicate correct values under trouble condition? (See Using the WDS or Equivalent.) | Yes | Go to the next step.
No | Inspect and repair or replace suspected parts and related harnesses. If the malfunction remains, perform the intermittent concern troubleshooting procedure. (See INTERMITTENT CONCERN TROUBLESHOOTING [L3 Turbo].)
13 | Inspect CMP and CKP sensor for following; • Installation condition (See CAMSHAFT POSITION (CMP) SENSOR REMOVAL/INSTALLATION [L3 Turbo].) (See CRANKSHAFT POSITION (CKP) SENSOR REMOVAL/INSTALLATION [L3 Turbo].) • Damaged trigger wheel and camshaft • Open or short circuit in wiring harnesses Is there any malfunction detected? | Yes | Repair or replace the malfunctioning part according to the inspection results.
No | Go to the next step.
14 | Remove and shake PCV valve. Does the PCV valve rattle? | Yes | Go to the next step.
No | Replace the PCV valve.
15 | Inspect spark plug condition. Is spark plug wet, covered with carbon or grayish white? | Yes | Spark plug is wet or covered with carbon: Perform the Spark Test and repair or replace malfunctioning part according to inspection result. (See Spark Test.) Spark plug is grayish white: Go to Step 23.
No | Install spark plugs on original cylinders. Go to the next step.
16 | Inspect for restriction in exhaust system and three-way catalytic converter (TWC). Is there any restriction? | Yes | Replace malfunctioning part.
No | Go to the next step.
17 | Remove parts necessary to inspect turbocharger without remove the turbocharger. Inspect if turbocharger compressor wheel is bent, damaged, or interfering with housing on vehicle. (See TURBOCHARGER INSPECTION [L3 Turbo].) Is there any problem? | Yes | Replace turbocharger.
No | Go to the next step.
18 | Inspect turbocharger compressor wheel locknut is loose or has fallen down inside turbocharger. Is there any problem? | Yes | Replace turbocharger.
No | Go to the next step.
19 | Inspect if turbocharger compressor wheel by hand. Does wheel turn easily and smoothly? | Yes | Go to the next step.
No | Replace turbocharger.
20 | Inspect 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 the next step.
21 | 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 out of vehicle, then Go to the next step.
No | Go to the next step.
22 | Is any engine oil found inside turbocharger compressor housing? | Yes | Wipe oil out vehicle and install all removed parts in Step 16. Then, Go to the next step.
No | Turbocharger is normal. Install all parts removed in Step 17. Then, Go to the next step.
23 | Inspect for leakage in fuel line. Is there any fuel leakage found? | Yes | Repair or replace suspected part.
No | Go to the next step.
24 | Access and monitor FUEL_PRES PID. Is the FUEL_PRES PID value within the specification? (See Using the WDS or Equivalent.) | Yes | Go to Step 27.
No | Go to the next step.
25 | Replace the high pressure fuel pump. Monitor FUEL_PRES PID. Is the FUEL_PRES PID value within the specified? (See Using the WDS or Equivalent.) | Yes | Troubleshooting is completed. Go to Step 30.
No | Go to the next step.
26 | Inspect the fuel pressure sensor. (See FUEL PRESSURE SENSOR INSPECTION [L3 Turbo].) Is the fuel pressure sensor normal? | Yes | Go to the next step.
No | Replace the delivery pipe.
27 | Connect the fuel pressure gauge between fuel pump and high pressure fuel pump. Measure the fuel pressure line of the low pressure side. (See FUEL LINE PRESSURE INSPECTION [L3 Turbo].) Is the fuel pressure within the specification? | Yes | Go to the next step.
No | Inspect for the following: • Fuel line restriction • Fuel filter clogging If normal replace the fuel pump.
28 | Inspect fuel injector for each cylinder. (See FUEL INJECTOR INSPECTION [L3 Turbo].) Are fuel injectors normal? | Yes | Go to the next step.
No | Replace suspected fuel injector. (See FUEL INJECTOR REMOVAL/INSTALLATION [L3 Turbo].)
29 | Measure compression pressure for each cylinder. (See COMPRESSION INSPECTION [L3 Turbo].) Are compression pressures within the specification? | Yes | Replace the injector driver module. If the problem remains, overhaul the engine.
No | Inspect for the 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 if necessary.
30 | Verify test results. • If normal, return to the diagnostic index to service any additional symptoms. • If a malfunction remains, inspect the related Service Bulletins and/or On-line Repair Information and perform the repair or diagnosis. - If the vehicle is repaired, troubleshooting is completed. - If the vehicle is not repaired or additional diagnostic information is not available, reprogram the PCM if a later calibration is available. Retest.