NO.6 LOW MAXIMUM SPEED AND POOR ACCELERATION [DJVA-EL]

id050312230600

6	Low maximum speed and poor acceleration
DESCRIPTION	•  Vehicle acceleration is poor at start. •  Delayed acceleration when accelerator pedal is depressed while driving. •  Ineffective engine performance on inclined roads.
POSSIBLE CAUSE	If the shift point is normal, it is highly possible that the engine system has a malfunction. •  Engine system malfunction ―  Air cleaner element restriction ―  Ignition leak etc. ―  Low engine compression •  Clutch burnt, slippage (Forward clutch) ―  Line pressure low ―  Input signal malfunction (Characteristic defective) •  APP sensor •  CKP sensor •  Grade sensor •  Input/turbine speed sensor •  Oil pressure sensor •  Primary pulley speed sensor •  Secondary pulley speed sensor •  Transaxle fluid temperature (TFT) sensor •  TR switch •  VSS •  Sensor GND ―  Control solenoid malfunction (Sticking) •  Belt grip pressure linear solenoid •  Shift control solenoid No.1 •  Shift control solenoid No.2 •  Body GND ―  Control valve body malfunction (Improper operation, stuck, restrict oil line) •  Forward clutch operation pressure system •  Belt malfunction ―  Belt (Slippage) ―  Primary pulley malfunction ―  Secondary pulley malfunction •  Transaxle operates in fail-safe function ―  Open or short in wiring harness ―  Malfunction of electronic parts of output and input system ―  Poor connection in connector •  Insufficient starting torque ―  CVT (continuously variable transaxle) fluid amount insufficient or defective ―  Torque converter malfunction (Improper operation) •  Wide torque converter clutch (TCC) operation range (Transaxle operates in fail-safe function) •  Burning or seizure of torque converter clutch (TCC) Note •  Before following the symptom troubleshooting steps, make sure that the Automatic Transaxle On-Board Diagnostic and Automatic Transaxle Basic Inspection are conducted. (See ON-BOARD DIAGNOSTIC SYSTEM DTC INSPECTION [DJVA-EL].) (See BASIC INSPECTION [DJVA-EL].)

Diagnostic procedure

STEP	INSPECTION		ACTION
1	Perform the road test. (See ROAD TEST [DJVA-EL].) Do all the transaxle functions operate properly?	Yes	Inspect the following: •  Restriction in air cleaner element (Replace to the new air cleaner temporarily) •  Ignition timing •  Ignition leak •  Spark plug •  Compression •  Valve timing Repair or replace the malfunctioning part according to the inspection results.
		No	The cause of symptom is in the CVT. •  Go to the next step.
2	Measure the APP sensor signal voltage using the M-MDS (PCM PIDs APP1 and APP2) or voltmeter. (See ON-BOARD DIAGNOSTIC TEST [MZR 1.3, MZR 1.5].) Do the APP sensor signal voltages change linearly according to accelerator pedal position?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning part according to the inspection results.
3	Disconnect the TCM connector. Measure the resistance between ground terminal at the TCM connector (terminal A1 and A23) and body ground. Is the resistance less than 5.0 ohms?	Yes	Go to the next step.
		No	Repair or replace the wiring harness for a possible open circuit.
4	Inspect the input signal circuit between following sensors and TCM: •  Oil pressure sensor •  Transaxle fluid temperature (TFT) sensor •  Input/turbine speed sensor •  Primary pulley speed sensor •  Secondary pulley speed sensor •  TR switch •  Grade sensor Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results.
		No	Go to the next step.
5	Inspect the following TCM output signal circuit: •  Belt grip pressure linear solenoid •  Shift control solenoid No.1 •  Shift control solenoid No.2 Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results.
		No	Go to the next step.
6	Inspect the following sensors: •  Oil pressure sensor (See OIL PRESSURE SENSOR INSPECTION [DJVA-EL].) •  Transaxle fluid temperature (TFT) sensor (See TRANSAXLE FLUID TEMPERATURE (TFT) SENSOR INSPECTION [DJVA-EL].) •  Input/turbine speed sensor (See INPUT/TURBINE SPEED SENSOR INSPECTION [DJVA-EL].) •  Primary pulley speed sensor (See PRIMARY PULLEY SPEED SENSOR INSPECTION [DJVA-EL].) •  Secondary pulley speed sensor (See SECONDARY PULLEY SPEED SENSOR INSPECTION [DJVA-EL].) •  TR switch (See TRANSAXLE RANGE (TR) SWITCH INSPECTION [DJVA-EL].) •  Grade sensor (See GRADE SENSOR INSPECTION [DJVA-EL].) Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results. •  If the transaxle fluid temperature (TFT) sensor has a malfunction: ―  Replace the CVT. (See CVT (CONTINUOUSLY VARIABLE TRANSAXLE) REMOVAL/INSTALLATION [DJVA-EL].)
		No	Go to the next step.
7	Inspect the following solenoids: (See SOLENOID VALVE INSPECTION [DJVA-EL].) •  Belt grip pressure linear solenoid •  Shift control solenoid No.1 •  Shift control solenoid No.2 Is there any malfunction?	Yes	Replace the CVT. (See CVT (CONTINUOUSLY VARIABLE TRANSAXLE) REMOVAL/INSTALLATION [DJVA-EL].)
		No	Replace the TCM. (See TCM REMOVAL/INSTALLATION [DJVA-EL].)
8	•  Verify the 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 repair or diagnosis. •  If the vehicle is repaired, the symptom troubleshooting is completed. •  If the vehicle is not repaired or additional diagnostic information is not available, replace the TCM. (See TCM REMOVAL/INSTALLATION [DJVA-EL].)