NO.12 LACK/LOSS OF POWER-ACCELERATION/CRUISE [ZJ, ZY]

id0103b0804800

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 DE10**-134189,DE****-134191,DE10**-139795,DE****-139796)
•  Poor fuel quality
•  Air leakage from intake-air system
•  Air cleaner restriction
•  Restriction in intake-air system
•  Vacuum leakage
•  Continuous memory DTC is stored
•  Engine overheating
•  Erratic signal from APP sensor
•  Erratic signal from CKP sensor
•  Erratic signal from TP sensor
•  Intermittent open or short circuit of APP sensor, IAT sensor, MAF sensor, TP sensor and VSS
•  CKP sensor and teeth of the crankshaft pulley
•  Spark plug malfunction
•  Improper operation of drive-by-wire control system
•  Restriction in exhaust system
•  Inadequate fuel pressure
•  Fuel pump mechanical malfunction
•  Improper operation of variable tumble control
•  Improper operation of variable intake air control (if equipped)
•  Improper operation of A/C system
•  Purge solenoid valve malfunction
•  EVAP control system malfunction
•  CMP sensor and projections of the camshaft pulley malfunction
•  EGR control system malfunction
•  Improper operation of variable valve timing control system
•  Low engine compression
•  PCV valve malfunction
•  Brake dragging
•  Clutch malfunction (MTX)
•  ATX malfunction (ATX)
•  Valve timing malfunction
•  PCM 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 injuries or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete the “BEFORE SERVICE PRECAUTION” and “AFTER SERVICE PRECAUTION” described in this manual. (See BEFORE SERVICE PRECAUTION [ZJ, ZY].) (See AFTER SERVICE PRECAUTION [ZJ, ZY].)
Caution
•  If there is foreign material on the connecting area of the quick release connector, it might damage the connector or fuel pipe. To prevent this, disconnect the connector and clean the connecting area before connecting.

Diagnostic procedure

STEP

INSPECTION

ACTION
1*1
Retrieve the PCM DTC using the M-MDS.
(See ON-BOARD DIAGNOSTIC TEST [ZJ, ZY])
Is the DTC P2299:00 present?
Yes
Go to the applicable DTC inspection. (drive-by-wire controlsystem operates with brake override system.)
(See DTC P2299:00 [ZJ, ZY].)
No
Go to the next step.
2
Inspect 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 intake manifold: such as EGR valve
•  Restriction in intake-air system (such as air cleaner element, fresh 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
If the engine stalls:
•  Perform the KOEO self test.
If the engine does not stall:
•  Perform the KOEO and KOER self test.
Are any continuous memory DTCs present?
Yes
Go to the appropriate DTC inspection.
(See DTC TABLE [ZJ, ZY].)
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 [ZJ, ZY].)
No
Go to the next step.
5
Perform the PID/DATA Monitor and Record Procedure and access the following PIDs:
(See ON-BOARD DIAGNOSTIC TEST [ZJ, ZY].)
•  APP1, APP2
•  IAT
•  MAF
•  RPM
•  TP REL, TP1, TP2
•  VSS
Monitor the each PID while driving the vehicle.
Are the PIDs normal?
(See PCM INSPECTION [ZJ, ZY].)
Yes
Go to the next step.
No
APP1, APP2 PIDs are not specified:
•  Inspect if output signal APP sensor changes smoothly.
IAT PID is not specified:
•  Inspect for air suction in the intake-air system.
•  If normal:
―  Inspect intermittent short circuit of IAT sensor and related wiring harness.
MAF PID is not specified:
•  Inspect the MAF sensor and related wiring harness for such as vibration, intermittent open/short circuit.
RPM PID is not specified:
•  Inspect the CKP sensor and related harness for such as vibration, intermittent open/short circuit.
TP1, TP2, TP REL PIDs are not specified:
•  Inspect if the TP sensor output increases smoothly.
VSS PID is not specified (ATX):
•  Inspect for open circuit of the VSS and related wire harness intermittently.
Repair or replace the malfunctioning part according to the inspection results.
6
Visually inspect the CKP sensor and teeth of the crankshaft pulley.
Is there any malfunction?
Yes
Repair or replace the malfunctioning part according to the inspection results.
No
Go to the next step.
7
Measure the gap between the CKP sensor and teeth of the crankshaft pulley.
•  Specification
―  0.5—1.5 mm {0.02—0.05 in}
Is the gap within the specification?
Yes
Go to the next step.
No
Replace the crankshaft pulley.
(See FRONT OIL SEAL REPLACEMENT [ZJ, ZY].)
8
Inspect the spark plug conditions.
(See SPARK PLUG INSPECTION [ZJ, ZY].)
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 the fuel injector.
Spark plug is grayish white:
•  Inspect for clogged the fuel injector.
Repair or replace the malfunctioning part according to the inspection results.
No
Install the spark plugs on original cylinders.
Go to the next step.
9
Perform the Drive-by-wire Control System Inspection.
(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [ZJ, ZY].)
Does the throttle body operate properly?
Yes
Go to the next step.
No
Repair or replace the malfunctioning part according to the inspection results.
10
Visually inspect the exhaust system part.
Is there any deformed exhaust system part?
Yes
Repair or replace the malfunctioning part according to the inspection results.
No
Go to the next step.
11
Install the fuel pressure gauge between the fuel pipe and the fuel distributor.
Perform the Active Command Modes Procedure and turn On the fuel pump using the FP PID.
(See ON-BOARD DIAGNOSTIC TEST [ZJ, ZY].)
Is the fuel line pressure correct?
(See FUEL LINE PRESSURE INSPECTION [ZJ, ZY].)
Yes
Go to the next step.
No
Zero or low:
•  Inspect the fuel pump relay and the fuel pump unit related wiring harness.
―  If there is no malfunction:
•  Replace the fuel pump unit.
―  If there is a malfunction:
•  Repair or replace the suspected wiring harness.
High:
•  Replace the fuel pump unit.
12
Inspect the variable tumble shutter valve actuator.
(See VARIABLE TUMBLE SHUTTER VALVE ACTUATOR INSPECTION [ZJ, ZY].)
Is there any malfunction?
Yes
Replace the variable tumble shutter valve actuator.
(See VARIABLE TUMBLE SHUTTER VALVE ACTUATOR REMOVAL/INSTALLATION [ZJ, ZY].)
No
Go to the next step.
13
Note
•  Following test is for the variable intake air control system. If not equipped, go to the next step.
Inspect the variable intake air shutter valve actuator.
(See VARIABLE INTAKE AIR SHUTTER VALVE ACTUATOR INSPECTION [ZJ, ZY].)
Is there any malfunction?
Yes
Replace the variable intake air shutter valve actuator.
(See VARIABLE INTAKE AIR SHUTTER VALVE ACTUATOR REMOVAL/INSTALLATION [ZJ, ZY].)
No
Go to the next step.
14
Note
•  Following test is for the engine stalling with the A/C on concern. If other symptoms exist, go to the next step.
Connect the pressure gauge to the A/C low and high side pressure lines.
Turn the A/C on and measure low side and high side pressures.
Are the pressures within 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”.
For other symptoms:
•  Inspect the following:
―  Refrigerant charging amount
―  Condenser fan operation
•  Repair or replace the malfunctioning part according to the inspection results.
15
Perform the A/C Cut-off Control System Inspection.
(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [ZJ, ZY].)
Does the A/C cut-off function properly?
Yes
Go to the next step.
No
Repair or replace the malfunctioning part according to the inspection results.
16
Disconnect the vacuum hose between the purge solenoid valve and the intake manifold from the purge solenoid valve side.
Plug opening end of vacuum hose.
Drive the vehicle.
Does the engine condition improve?
Yes
Inspect the purge solenoid valve (stuck open mechanically).
(See PURGE SOLENOID VALVE INSPECTION [ZJ, ZY].)
•  If the purge solenoid valve is normal:
―  Inspect the EVAP control system.
―  Repair or replace the malfunctioning part according to the inspection results, if necessary.
•  If the purge solenoid valve has a malfunction:
―  Replace the purge solenoid valve.
No
Go to the next step.
17
Visually inspect the CMP sensor and projections of the camshaft pulley.
Is there any malfunction?
Yes
Repair or replace the malfunctioning part according to the inspection results, if necessary.
No
Go to the next step.
18
Perform the EGR Control System Inspection.
(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [ZJ, ZY].)
Is there any malfunction?
Yes
Repair or replace the malfunctioning part according to the inspection results.
No
Go to the next step.
19
Perform the Variable Valve Timing Control System Operation Inspection.
(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [ZJ, ZY].)
Does the variable valve timing control system operate properly?
Yes
Go to the next step.
No
Repair or replace the malfunctioning part according to the inspection results.
20
Inspect the engine compression.
(See COMPRESSION INSPECTION [ZJ, ZY].)
Is there any malfunction?
Yes
Inspect for cause.
Repair or replace the malfunctioning part according to the inspection results.
No
Go to the next step.
21
Inspect the PCV valve operation.
(See POSITIVE CRANKCASE VENTILATION (PCV) VALVE INSPECTION [ZJ, ZY].)
Is there any malfunction?
Yes
Replace the PCV valve and the oil separator as a single unit.
(See POSITIVE CRANKCASE VENTILATION (PCV) VALVE REMOVAL/INSTALLATION [ZJ, ZY].)
No
Inspect the following:
•  Brake system for dragging
•  Clutch (MTX)
•  Shift point (ATX)
•  Valve timing
Repair or replace the malfunctioning part according to the inspection results.
22
Verify test results.
•  If normal, return to the diagnostic index to service any additional symptoms.
•  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, replace the PCM.

*1  :From DE10**-134189,DE****-134191,DE10**-139795,DE****-139796