NO.12 LACK/LOSS OF POWER-ACCELERATION/CRUISE [L5]

12	LACK/LOSS OF POWER—ACCELERATION/CRUISE
DESCRIPTION	• Performance is poor under load (such as power down when climbing hills).
POSSIBLE CAUSE	• Drive-by-wire control system operates with brake override system (From ER**-220211,ER10-220214) • Poor fuel quality • Air leakage from intake air system • Intake air system restriction • Improper installation of EGR valve • Vacuum leakage • PCM DTC is stored • Engine overheating • APP sensor malfunction • TP sensor malfunction • CKP sensor or related wiring harness malfunction • MAF sensor or related wiring harness malfunction • IAT sensor or related wiring harness malfunction • Battery power supply circuit malfunction • VSS or related wiring harness malfunction • CKP sensor and teeth of crankshaft pulley malfunction • Spark plug malfunction • Fuel injector malfunction ― Fuel leakage from fuel injector ― Fuel injector is clogging • Improper operation of electronic throttle control system • Exhaust system part malfunction • Excessive or insufficient fuel pressure ― Fuel pump relay or fuel pump circuit malfunction ― Clogging fuel line ― Pressure regulator malfunction (built-in fuel pump unit) ― Fuel pump unit malfunction • Improper operation of variable tumble control • Improper operation of variable intake air control • Improper operation of A/C system • Purge solenoid valve malfunction • Evaporative emission control system malfunction • CMP sensor and teeth of camshaft malfunction • EGR valve malfunction • Improper operation of variable valve timing control system • Low engine compression • Improper valve timing • PCV valve malfunction • ATX internal malfunction • Brake dragging Warning • The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before servicing the fuel system: ― 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 injuries or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete “BEFORE SERVICE PRECAUTION” and “AFTER SERVICE PRECAUTION” described in this manual. (See BEFORE SERVICE PRECAUTION [L5].) (See AFTER SERVICE PRECAUTION [L5].) Caution • Disconnecting/connecting the quick release connector without cleaning it may cause damage to the fuel pipe and the quick release connector. Always clean the quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material.

LACK/LOSS OF POWER—ACCELERATION/CRUISE

DESCRIPTION

• Performance is poor under load (such as power down when climbing hills).

POSSIBLE CAUSE

• Drive-by-wire control system operates with brake override system (From ER****-220211,ER10**-220214)

• Poor fuel quality

• Air leakage from intake air system

• Intake air system restriction

• Improper installation of EGR valve

• Vacuum leakage

• PCM DTC is stored

• Engine overheating

• APP sensor malfunction

• TP sensor malfunction

• CKP sensor or related wiring harness malfunction

• MAF sensor or related wiring harness malfunction

• IAT sensor or related wiring harness malfunction

• Battery power supply circuit malfunction

• VSS or related wiring harness malfunction

• CKP sensor and teeth of crankshaft pulley malfunction

• Spark plug malfunction

• Fuel injector malfunction

― Fuel leakage from fuel injector

― Fuel injector is clogging

• Improper operation of electronic throttle control system

• Exhaust system part malfunction

• Excessive or insufficient fuel pressure

― Fuel pump relay or fuel pump circuit malfunction

― Clogging fuel line

― Pressure regulator malfunction (built-in fuel pump unit)

― Fuel pump unit malfunction

• Improper operation of variable tumble control

• Improper operation of variable intake air control

• Improper operation of A/C system

• Purge solenoid valve malfunction

• Evaporative emission control system malfunction

• CMP sensor and teeth of camshaft malfunction

• EGR valve malfunction

• Improper operation of variable valve timing control system

• Low engine compression

• Improper valve timing

• PCV valve malfunction

• ATX internal malfunction

• Brake dragging

Warning

• The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before servicing the fuel system:

― 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 injuries or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete “BEFORE SERVICE PRECAUTION” and “AFTER SERVICE PRECAUTION” described in this manual. (See BEFORE SERVICE PRECAUTION [L5].) (See AFTER SERVICE PRECAUTION [L5].)

Caution

• Disconnecting/connecting the quick release connector without cleaning it may cause damage to the fuel pipe and the quick release connector. Always clean the quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material.

STEP	INSPECTION	RESULTS	ACTION
1 ^*1	Perform the PCM DTC inspection using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [L5].) Is the DTC P2299:00 present?	Yes	Go to the applicable DTC inspection. (drive-by-wire control system operates with brake override system.) (See DTC P2299:00 [L5].)
No	Go to the next step.
2	Verify the following: • Fuel quality (such as proper octane, contamination, winter/summer blend) • No air leakage from the intake air system • No restriction of the intake air system • Proper sealing of the intake manifold and components attached to the intake manifold: such as the EGR valve • Restriction in the intake air system (such as the air cleaner element, fresh air duct) • Vacuum connection Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results. Repeat Step 2.
No	Go to the next step.
3	Perform the PCM DTC inspection using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [L5].) Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [L5].)
No	Go to the next step.
4	Is the engine overheating?	Yes	Go to the symptom troubleshooting “NO.17 COOLING SYSTEM CONCERNS-OVERHEATING”. (See NO.17 COOLING SYSTEM CONCERNS-OVERHEATING [L5].)
No	Go to the next step.
5	Access the following PIDs using the M-MDS: (See ON-BOARD DIAGNOSTIC TEST [L5].) • APP1 • APP2 • TP_REL • RPM • MAF • VPWR • VSS Are the PID values normal? (See PCM INSPECTION [L5].)	Yes	Go to the next step.
No	APP1, APP2 PIDs are not specified: • Inspect if the output signal from the APP sensor changes smoothly. (See ACCELERATOR PEDAL POSITION (APP) SENSOR INSPECTION [L5].) TP_REL PID is not specified: • Inspect if the output signal from the TP sensor changes smoothly. (See THROTTLE POSITION (TP) SENSOR INSPECTION [L5].) RPM PID is not specified: • Inspect the CKP sensor and related wiring harness for vibration or an intermittent open/short circuit. (See CRANKSHAFT POSITION (CKP) SENSOR INSPECTION [L5].) MAF PID is not specified: • Inspect for an intermittent open circuit of the MAF sensor and the related wiring harness. (See MASS AIR FLOW (MAF) SENSOR INSPECTION [L5].) VPWR PID is not specified: • Inspect for an intermittent open circuit. VSS PID is not specified: • Inspect for an intermittent open circuit in the VSS and related wiring harness. (See VEHICLE SPEED SENSOR (VSS) INSPECTION [FS5A-EL].) Repair or replace the malfunctioning part according to the inspection results.
6	Visually inspect the CKP sensor and teeth of the crankshaft pulley. (See CRANKSHAFT POSITION (CKP) SENSOR INSPECTION [L5].) Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results.
No	Go to the next step.
7	Inspect the spark plug condition. (See SPARK PLUG INSPECTION [L5].) Is the spark plug wet, covered with carbon or grayish white?	Yes	Spark plug is wet or covered with carbon: • Inspect for fuel leakage from fuel injector. Spark plug is grayish white: • Inspect the fuel injector for clogging. Repair or replace the malfunctioning part according to the inspection results.
No	Install the spark plugs on original cylinders, then go to the next step.
8	Perform the Electronic Throttle Control System Inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [L5].) Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results.
No	Go to the next step.
9	Visually inspect the exhaust system part. (See EXHAUST SYSTEM INSPECTION [L5].) Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results.
No	Go to the next step.
10	Inspect the fuel line pressure. (See FUEL LINE PRESSURE INSPECTION [L5].) Is there any malfunction?	Yes	Zero or low: • Inspect the fuel pump relay and the fuel pump circuit. (See RELAY INSPECTION [L5].) • Inspect the fuel line for clogging. ― If there is a malfunction: • Repair or replace the malfunctioning part according to the inspection results. ― If there is no malfunction: • Replace the fuel pump unit. (See FUEL PUMP UNIT REMOVAL/INSTALLATION [L5].) High: • Replace the fuel pump unit. (See FUEL PUMP UNIT REMOVAL/INSTALLATION [L5].)
No	Go to the next step.
11	Perform the Variable Tumble Control Operation Inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [L5].) Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results.
No	Go to the next step.
12	Perform the Variable Intake Air Control Operation Inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [L5].) Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results.
No	Go to the next step.
13	Note • The following test is for stall concerns with the A/C on. If other symptoms exist, go to the next step. Connect pressure gauges to the A/C low side and high side pressure lines. Turn the A/C on and measure the low side and high side pressures. Are the pressures within the specifications? (See REFRIGERANT PRESSURE CHECK.)	Yes	Go to the next step.
No	If the A/C is always on: • Go to the symptom troubleshooting "NO.24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY". (See NO.24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY [L5].) For other symptoms: • Inspect the following: ― Refrigerant charging amount ― Condenser fan operation • Repair or replace the malfunctioning part according to the inspection results.
14	Perform the A/C Cut-off Control System Inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [L5].) Is there any malfunction?	Yes	Inspect the A/C cut-off system components. Repair or replace the malfunctioning part according to the inspection results.
No	Go to the next step.
15	Disconnect the vacuum hose between the purge solenoid valve and the intake manifold from the purge solenoid valve side. Plug the open end of the vacuum hose. Turn the ignition switch to the ON position (engine ON). Is the engine stall now eliminated?	Yes	Inspect the following: • Purge solenoid valve (See PURGE SOLENOID VALVE INSPECTION [L5].) • Evaporative emission control system (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [L5].) Repair or replace the malfunctioning part according to the inspection results.
No	Go to the next step.
16	Visually inspect the CMP sensor and teeth of the camshaft. (See CAMSHAFT POSITION (CMP) SENSOR INSPECTION [L5].) Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results.
No	Go to the next step.
17	Perform the EGR Control System Inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [L5].) Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results.
No	Go to the next step.
18	Perform the Variable Valve Timing Control System Operation Inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [L5].) Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results.
No	Go to the next step.
19	Inspect the engine compression. (See COMPRESSION INSPECTION [L5].) Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results.
No	Go to the next step.
20	Inspect the PCV valve. (See POSITIVE CRANKCASE VENTILATION (PCV) VALVE INSPECTION [L5].) Is there any malfunction?	Yes	Replace the PCV valve and the oil separator as a single unit, then go to the next step. (See POSITIVE CRANKCASE VENTILATION (PCV) VALVE REMOVAL/INSTALLATION [L5].)
No	Inspect the following: • Valve timing • Internal transaxle part • Brake system for dragging Repair or replace the malfunctioning part according to the inspection results.
21	Verify test results. • If normal, return to the diagnostic index to service any additional symptoms. (See SYMPTOM DIAGNOSTIC INDEX [L5].) • If the malfunction remains, inspect the related Service 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.

STEP

INSPECTION

RESULTS

ACTION

1 ^*1

Perform the PCM DTC inspection using the M-MDS.

(See ON-BOARD DIAGNOSTIC TEST [L5].)

Is the DTC P2299:00 present?

Yes

Go to the applicable DTC inspection. (drive-by-wire control system operates with brake override system.)

(See DTC P2299:00 [L5].)

Go to the next step.

Verify the following:

• Fuel quality (such as proper octane, contamination, winter/summer blend)

• No air leakage from the intake air system

• No restriction of the intake air system

• Proper sealing of the intake manifold and components attached to the intake manifold: such as the EGR valve

• Restriction in the intake air system (such as the air cleaner element, fresh air duct)

• Vacuum connection

Is there any malfunction?

Yes

Repair or replace the malfunctioning part according to the inspection results.

Repeat Step 2.

Go to the next step.

Perform the PCM DTC inspection using the M-MDS.

(See ON-BOARD DIAGNOSTIC TEST [L5].)

Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [L5].)

Go to the next step.

Is the engine overheating?

Yes

Go to the symptom troubleshooting “NO.17 COOLING SYSTEM CONCERNS-OVERHEATING”.

(See NO.17 COOLING SYSTEM CONCERNS-OVERHEATING [L5].)

Go to the next step.

Access the following PIDs using the M-MDS:

(See ON-BOARD DIAGNOSTIC TEST [L5].)

• APP1

• APP2

• TP_REL

• RPM

• MAF

• VPWR

• VSS

Are the PID values normal?

(See PCM INSPECTION [L5].)

Yes

Go to the next step.

APP1, APP2 PIDs are not specified:

• Inspect if the output signal from the APP sensor changes smoothly. (See ACCELERATOR PEDAL POSITION (APP) SENSOR INSPECTION [L5].)

TP_REL PID is not specified:

• Inspect if the output signal from the TP sensor changes smoothly. (See THROTTLE POSITION (TP) SENSOR INSPECTION [L5].)

RPM PID is not specified:

• Inspect the CKP sensor and related wiring harness for vibration or an intermittent open/short circuit. (See CRANKSHAFT POSITION (CKP) SENSOR INSPECTION [L5].)

MAF PID is not specified:

• Inspect for an intermittent open circuit of the MAF sensor and the related wiring harness. (See MASS AIR FLOW (MAF) SENSOR INSPECTION [L5].)

VPWR PID is not specified:

• Inspect for an intermittent open circuit.

VSS PID is not specified:

• Inspect for an intermittent open circuit in the VSS and related wiring harness. (See VEHICLE SPEED SENSOR (VSS) INSPECTION [FS5A-EL].)

Repair or replace the malfunctioning part according to the inspection results.

Visually inspect the CKP sensor and teeth of the crankshaft pulley.

(See CRANKSHAFT POSITION (CKP) SENSOR INSPECTION [L5].)

Is there any malfunction?

Yes

Repair or replace the malfunctioning part according to the inspection results.

Go to the next step.

Inspect the spark plug condition.

(See SPARK PLUG INSPECTION [L5].)

Is the spark plug wet, covered with carbon or grayish white?

Yes

Spark plug is wet or covered with carbon:

• Inspect for fuel leakage from fuel injector.

Spark plug is grayish white:

• Inspect the fuel injector for clogging.

Repair or replace the malfunctioning part according to the inspection results.

Install the spark plugs on original cylinders, then go to the next step.

Perform the Electronic Throttle Control System Inspection.

(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [L5].)

Is there any malfunction?

Yes

Repair or replace the malfunctioning part according to the inspection results.

Go to the next step.

Visually inspect the exhaust system part.

(See EXHAUST SYSTEM INSPECTION [L5].)

Is there any malfunction?

Yes

Repair or replace the malfunctioning part according to the inspection results.

Go to the next step.

Inspect the fuel line pressure.

(See FUEL LINE PRESSURE INSPECTION [L5].)

Is there any malfunction?

Yes

Zero or low:

• Inspect the fuel pump relay and the fuel pump circuit. (See RELAY INSPECTION [L5].)

• Inspect the fuel line for clogging.

― If there is a malfunction:

• Repair or replace the malfunctioning part according to the inspection results.

― If there is no malfunction:

• Replace the fuel pump unit. (See FUEL PUMP UNIT REMOVAL/INSTALLATION [L5].)

High:

• Replace the fuel pump unit. (See FUEL PUMP UNIT REMOVAL/INSTALLATION [L5].)

Go to the next step.

Perform the Variable Tumble Control Operation Inspection.

(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [L5].)

Is there any malfunction?

Yes

Repair or replace the malfunctioning part according to the inspection results.

Go to the next step.

Perform the Variable Intake Air Control Operation Inspection.

(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [L5].)

Is there any malfunction?

Yes

Repair or replace the malfunctioning part according to the inspection results.

Go to the next step.

Note

• The following test is for stall concerns with the A/C on. If other symptoms exist, go to the next step.

Connect pressure gauges to the A/C low side and high side pressure lines.

Turn the A/C on and measure the low side and high side pressures.

Are the pressures within the specifications?

(See REFRIGERANT PRESSURE CHECK.)

Yes

Go to the next step.

If the A/C is always on:

• Go to the symptom troubleshooting "NO.24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY". (See NO.24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY [L5].)

For other symptoms:

• Inspect the following:

― Refrigerant charging amount

― Condenser fan operation

• Repair or replace the malfunctioning part according to the inspection results.

Perform the A/C Cut-off Control System Inspection.

(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [L5].)

Is there any malfunction?

Yes

Inspect the A/C cut-off system components.

Repair or replace the malfunctioning part according to the inspection results.

Go to the next step.

Disconnect the vacuum hose between the purge solenoid valve and the intake manifold from the purge solenoid valve side.

Plug the open end of the vacuum hose.

Turn the ignition switch to the ON position (engine ON).

Is the engine stall now eliminated?

Yes

Inspect the following:

• Purge solenoid valve (See PURGE SOLENOID VALVE INSPECTION [L5].)

• Evaporative emission control system (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [L5].)

Repair or replace the malfunctioning part according to the inspection results.

Go to the next step.

Visually inspect the CMP sensor and teeth of the camshaft.

(See CAMSHAFT POSITION (CMP) SENSOR INSPECTION [L5].)

Is there any malfunction?

Yes

Repair or replace the malfunctioning part according to the inspection results.

Go to the next step.

Perform the EGR Control System Inspection.

(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [L5].)

Is there any malfunction?

Yes

Repair or replace the malfunctioning part according to the inspection results.

Go to the next step.

Perform the Variable Valve Timing Control System Operation Inspection.

(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [L5].)

Is there any malfunction?

Yes

Repair or replace the malfunctioning part according to the inspection results.

Go to the next step.

Inspect the engine compression.

(See COMPRESSION INSPECTION [L5].)

Is there any malfunction?

Yes

Repair or replace the malfunctioning part according to the inspection results.

Go to the next step.

Inspect the PCV valve.

(See POSITIVE CRANKCASE VENTILATION (PCV) VALVE INSPECTION [L5].)

Is there any malfunction?

Yes

Replace the PCV valve and the oil separator as a single unit, then go to the next step.

(See POSITIVE CRANKCASE VENTILATION (PCV) VALVE REMOVAL/INSTALLATION [L5].)

Inspect the following:

• Valve timing

• Internal transaxle part

• Brake system for dragging

Repair or replace the malfunctioning part according to the inspection results.

Verify test results.

• If normal, return to the diagnostic index to service any additional symptoms. (See SYMPTOM DIAGNOSTIC INDEX [L5].)

• If the malfunction remains, inspect the related Service 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.