NO.12 LACK/LOSS OF POWER-ACCELERATION/CRUISE [MZR 1.3, MZR 1.5]

id0103d7804800

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
•  Poor fuel quality
•  Air leakage from intake-air system
•  Air cleaner restriction
•  Restriction in intake-air system
•  Vacuum leakage
•  Clutch slippage (MTX)
•  Brake dragging
•  Continuous memory DTC is stored
•  Engine overheating
•  Intake air temperature is too hot
•  Erratic signal to PCM
―  APP sensor or related wiring harness malfunction
―  TP sensor or related wiring harness malfunction
―  MAF sensor or related wiring harness malfunction
―  IAT sensor or related wiring harness malfunction
―  CKP sensor or related wiring harness malfunction
―  VSS or related wiring harness malfunction
•  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 relay or fuel pump circuit malfunction
―  Restriction in fuel line
―  Pressure regulator malfunction (built-into fuel pump unit)
―  Fuel pump mechanical malfunction
•  Improper operation of variable tumble control
•  Improper operation of A/C system
•  Purge solenoid valve malfunction
•  EVAP control system malfunction
•  CMP sensor and projections of the camshaft pulley malfunction
•  Improper operation of EGR control system
•  Improper operation of variable valve timing control system
•  Low engine compression
•  PCV valve malfunction
•  Brake dragging
•  Clutch malfunction (MTX)
•  ATX malfunction (ATX)
•  CVT malfunction (CVT)
•  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 “BEFORE SERVICE PRECAUTION” and “AFTER SERVICE PRECAUTION” described in this manual. (See BEFORE SERVICE PRECAUTION [MZR 1.3, MZR 1.5].) (See AFTER SERVICE PRECAUTION [MZR 1.3, MZR 1.5].)
Caution
•  Disconnecting/connecting the quick release connector without cleaning it may possibly cause damage to 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
1
CONFIRM DRIVE-BY-WIRE CONTROL SYSTEM OPERATES WITH BRAKE OVERRIDE SYSTEM
•  Retrieve the PCM DTC using the M-MDS.
•  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 [MZR 1.3, MZR 1.5].)
No
Go to the next step.
2
INSPECT RELATED PART CONDITION
•  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 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
―  Clutch slippage (MTX)
•  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
VERIFY PCM DTC
•  If the engine stalls:
―  Perform the KOEO self test.
•  If the engine does not stall:
―  Perform the KOEO and KOER self test.
•  Are there any continuous memory DTCs displayed?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [MZR 1.3, MZR 1.5].)
No
Go to the next step.
4
VERIFY IF MALFUNCTION CAUSE IS OVERHEATING
•  Is the engine overheating?
Yes
Go to the symptom troubleshooting “NO.17 COOLING SYSTEM CONCERNS-OVERHEATING”.
(See NO.17 COOLING SYSTEM CONCERNS-OVERHEATING [MZR 1.3, MZR 1.5].)
No
Go to the next step.
5
VERIFY CURRENT INPUT SIGNAL STATUS
Caution
•  While performing this step, always operate the vehicle in a safe and lawful manner.
•  When the M-MDS is used to observe monitor system status while driving, be sure to have another technician with you, or record the data in the M-MDS using the PID/DATA MONITOR AND RECORD capturing function and inspect later.
•  Access the following PIDs using the M-MDS:
―  APP1
―  APP2
―  TP1
―  TP2
―  RPM
―  MAF
―  IAT
―  VSS
•  Monitor the each PID while driving the vehicle.
•  Are all PIDs normal?
Yes
Go to the next step.
No
APP1, APP2 PIDs are not as specified:
•  Inspect if the output signal from the APP sensor changes smoothly.
TP1, TP2 PIDs are not as specified:
•  Inspect if the output signal from the TP sensor changes smoothly.
RPM PID is not as specified:
•  Inspect the CKP sensor and related wiring harness for vibration or an intermittent open/short circuit.
MAF PID is not as specified:
•  Inspect for an intermittent open circuit of the MAF sensor and the related wiring harness.
IAT PID is not as specified:
•  Inspect for air suction in the intake-air system.
―  If there is any malfunction:
•  Repair or replace the malfunctioning part according to the inspection results.
―  If there is no malfunction:
•  Inspect for intermittent short circuit of the IAT sensor and related wiring harness.
•  Repair or replace the suspected wiring harness.
VSS PID is not as specified:
•  Inspect for intermittent open circuit of the VSS and related wiring harness. (ATX)
•  Inspect the ABS wheel-speed sensor. (MTX, CVT)
Repair or replace the malfunctioning part according to the inspection results.
6
VISUALLY INSPECT CKP SENSOR AND PULSE WHEEL
•  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
INSPECT CKP SENSOR AIR GAP
•  Measure the gap between CKP sensor and teeth of the crankshaft pulley.
•  Is the gap within the specification?
Yes
Go to the next step.
No
Replace the crankshaft pulley.
8
VERIFY SPARK PLUG CONDITION
•  Inspect the spark plug condition.
•  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 restriction.
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.
9
INSPECT THROTTLE BODY FOR CLOGGING
•  Visually inspect the throttle valve.
•  Are any foreign material adhere to around throttle valve?
Yes
Clean the throttle valve.
No
Go to the next step.
10
INSPECT DRIVE-BY-WIRE CONTROL SYSTEM OPERATION
•  Perform the Drive-by-wire Control System Inspection.
•  Is there any malfunction?
Yes
Repair or replace the malfunctioning part according to the inspection results.
No
Go to the next step.
11
INSPECT EXHAUST SYSTEM
•  Visually inspect the exhaust system part.
•  Is there any malfunction?
Yes
Repair or replace the malfunctioning part according to the inspection results.
No
Go to the next step.
12
INSPECT FUEL LINE PRESSURE
•  Install the fuel pressure gauge between fuel pipe and fuel distributor.
•  Inspect the fuel line pressure.
•  Is there any malfunction?
Yes
Zero or low:
•  Inspect the fuel pump relay and the fuel pump unit related wiring harness.
•  Inspect the fuel line for restriction.
―  If there is any malfunction:
•  Repair or replace the malfunctioning part according to the inspection results.
―  If there is no malfunction:
•  Replace the fuel pump unit. (pressure regulator or fuel pump mechanical malfunction)
High:
•  Replace the fuel pump unit. (pressure regulator malfunction)
No
Go to the next step.
13
INSPECT VARIABLE TUMBLE CONTROL OPERATION
•  Perform the Variable Tumble Control Operation Inspection.
•  Is there any malfunction?
Yes
Repair or replace the malfunctioning part according to the inspection results.
No
Go to the next step.
14
DETERMINE IF MALFUNCTION CAUSE IS A/C SYSTEM OR OTHER
Note
•  The following test is for stall concerns with the A/C on. If other symptoms exist, go to the next step.
•  Connect the 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 specification?
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
INSPECT A/C CUT-OFF CONTROL SYSTEM OPERATION
•  Perform the A/C Cut-off Control System Inspection.
•  Is there any malfunction?
Yes
Repair or replace the malfunctioning part according to the inspection results.
No
Go to the next step.
16
DETERMINE IF MALFUNCTION CAUSE IS EVAPORATIVE EMISSION CONTROL SYSTEM OR OTHER
•  Disconnect the vacuum hose between purge solenoid valve and intake manifold from purge solenoid valve side.
•  Plug the open end of the vacuum hose.
•  Drive the vehicle.
•  Does the engine condition improve?
Yes
Inspect the purge solenoid valve (stuck open mechanically).
(See PURGE SOLENOID VALVE INSPECTION [MZR 1.3, MZR 1.5].)
•  If the purge solenoid valve has a malfunction:
―  Replace the purge solenoid valve.
•  If the purge solenoid valve is normal:
―  Inspect the EVAP control system.
―  Repair or replace the malfunctioning part according to the inspection results.
No
Go to the next step.
17
VISUALLY INSPECT CMP SENSOR AND PULSE WHEEL
•  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.
No
Go to the next step.
18
INSPECT EGR VALVE OPERATION
•  Perform the EGR Control System Inspection.
•  Is there any malfunction?
Yes
Repair or replace the malfunctioning part according to the inspection results.
No
Go to the next step.
19
INSPECT VARIABLE VALVE TIMING CONTROL SYSTEM OPERATION
•  Perform the Variable Valve Timing Control System Operation Inspection.
•  Is there any malfunction?
Yes
Repair or replace the malfunctioning part according to the inspection results.
No
Go to the next step.
20
INSPECT ENGINE COMPRESSION
•  Inspect the engine compression.
•  Is there any malfunction?
Yes
Repair or replace the malfunctioning part according to the inspection results.
No
Go to the next step.
21
INSPECT IF MALFUNCTION CAUSE IS PCV VALVE OR OTHER
•  Inspect the PCV valve operation.
•  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 [MZR 1.3, MZR 1.5].)
No
Inspect the following:
•  Brake system for dragging
•  Clutch (MTX)
•  Shift point (ATX, CVT)
•  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.