MECHANICAL SYSTEM TEST [DJVA-EL]

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Mechanical System Test Preparation

1.  Engage the parking brake and use wheel chocks at the front and rear of the wheels.

2.  Inspect the engine coolant level. (See ENGINE COOLANT LEVEL INSPECTION [MZR 1.5, MZR 1.6].)

3.  Inspect the engine oil level. (See ENGINE OIL LEVEL INSPECTION [MZR 1.5, MZR 1.6].)

4.  Adjust the CVT fluid level. (See CVT (CONTINUOUSLY VARIABLE TRANSAXLE) FLUID LEVEL ADJUSTMENT [DJVA-EL].)

5.  Inspect the ignition timing. (See ENGINE TUNE-UP [MZR 1.5, MZR 1.6].)

6.  Inspect the idle speed. (See ENGINE TUNE-UP [MZR 1.5, MZR 1.6].)

7.  Verify that no DTCs recorded. (See ON-BOARD DIAGNOSTIC SYSTEM DTC INSPECTION [DJVA-EL].)


Line Pressure Test

1.  Perform “Mechanical System Test Preparation”. (See Mechanical System Test Preparation.)

Warning
•  Removing the measurement plug when the CVT fluid is hot can be dangerous. Hot CVT fluid can come out of the opening and badly burn you. Before removing the measurement plug, allow the CVT fluid to cool.

2.  Perform the line pressure test with the engine stall at D range.

(1)  Remove the measurement plug and O-ring from the line pressure inspection port.
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(2)  Connect the SSTs to CVT as shown in the figure
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(3)  Start the engine.
(4)  Warm-up the transaxle until the CVT fluid temperature reaches at 50—80 °C {90—144 °F}.
(5)  Firmly depress the brake pedal with the left foot.
(6)  Select the selector lever to D range.
Caution
•  If the accelerator pedal is pressed for longer than 5 s while the brake pedal is pressed, the transaxle could be damaged. Therefore, perform Steps (3)—(4) within 5 s.
(7)  Gently depress the accelerator pedal with the right foot.
(8)  When the engine speed no longer increases, quickly read the speed and release the accelerator pedal.
(9)  Select the selector lever to N position and let the engine idle for 1 min or more to cool the CVT fluid.
(10)  Read the line pressure with the engine idle.

Condition

Possible Cause
High pressure
•  Control valve body malfunction
Low pressure
•  Control valve body malfunction (Hydraulic circuit malfunction)
•  CVT malfunction (Forward clutch slippage)

Line Pressure

Condition item

Test Condition

Range

Specification (MPa {kgf/cm2, psi})
Clutch pressure
engine stall
D range
1.37—1.63 {14.0—16.6, 199—236}
Belt grip pressure
2.50—4.50 {25.5—45.8, 363—652}

3.  Stop the engine.

4.  Remove the SSTs.

Warning
•  Removing the measurement plug when the CVT fluid is hot can be dangerous. Hot CVT fluid can come out of the opening and badly burn you. Before removing the measurement plug, allow the CVT fluid to cool.

5.  Install a new measurement plug in the inspection port.

Tightening torque
7.4 N·m {75 kgf·cm, 65 in·lbf}


Stall Test

1.  Perform “Mechanical System Test Preparation”. (See Mechanical System Test Preparation.)

2.  Start the engine.

3.  Perform the stall test at D range.

(1)  Firmly depress the brake pedal with the left foot.
(2)  Select the selector lever to D range.
Caution
•  If the accelerator pedal is pressed for longer than 5 s while the brake pedal is pressed, the transaxle could be damaged. Therefore, perform Steps (3)—(4) within 5 s.
(3)  Gently depress the accelerator pedal with the right foot.
(4)  When the engine speed no longer increases, quickly read the speed and release the accelerator pedal.
(5)  Select the selector lever to N position and let the engine idle for 1 min or more to cool the CVT fluid.

4.  Perform the stall test at R position in the same manner.

•  If there is any malfunction, inspect the following “possible cause” according to the condition.

Condition

Possible Cause
Above specification
In D range and R position
•  Control valve body malfunction (Line pressure low)
•  CVT malfunction (Belt slippage)
In D range
•  Control valve body malfunction (Line pressure low)
•  CVT malfunction (Forward clutch slippage)
In R range
•  Control valve body malfunction (Line pressure low)
•  CVT malfunction (Reverse brake slippage)
Below specification
•  Engine lack of power
•  Torque converter malfunction (One-way clutch malfunction)

Stall Speed

Test Condition

Specification (rpm)
D range
2,000—2,600
R position


Time Lag Test

1.  Perform “Mechanical System Test Preparation”. (See Mechanical System Test Preparation.)

2.  Start the engine.

3.  Perform the time lag test when selecting the selector lever from N position to D range.

(1)  Select the selector lever from N position to D range while the brake pedal is depressed.
(2)  Measure the time it takes from selecting until shock is felt when shifting the selector lever from N position to D range.
(3)  Shift the selector lever to the N position and idle the engine for 1 min or more.
(4)  Measure the time-lag time 3 times or more and take the average.

4.  Perform the time lag test when selecting the selector lever from N position to R position in the same manner.

•  If there is any malfunction, inspect the following “possible cause” according to the condition.

Condition

Possible Cause
From N position to D range
More than specification
•  Control valve body malfunction (Line pressure low)
•  CVT malfunction (Forward clutch slippage)
•  CVT malfunction (Belt slippage)
From N position to R position
More than specification
•  Control valve body malfunction (Line pressure low)
•  CVT malfunction (Reverse brake slippage)
•  CVT malfunction (Belt slippage)

Time Lag

Test Condition

Specification (s)
From N position to D range
Below 1.2
From N position to R position
Below 1.5