Line Pressure Test

WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

Perform "Mechanical System Test Preparation". (See MECHANICAL SYSTEM TEST PREPARATION .)
WARNING:
- Removing the square-head plug when the ATF is hot can be dangerous. Hot ATF can come out of the opening and badly burn you. Before removing the square-head plug, allow the ATF to cool.
NOTE:
- Use a suitable oil pressure gauge that corresponds to the line pressure because the maximum scale value differs depending on the oil pressure gauge.
Perform the line pressure test with the engine idle at D range.
1. Remove the square-head plug from the line pressure inspection port.
2. Connect the SSTs as following:
  - When using the oil pressure gauge set (49 0378 400C), connect the SSTs (49 H019 002, 49 0378 400C, 49 B019 901B) to the line pressure inspection port as shown in the figure.
  - When using the oil pressure gauge set (49 D019 9A2), connect the SSTs (49 D019 910, 49 D019 911, 49 D019 913, 49 D019 909, 49 D019 908) to the line pressure inspection port as shown in the figure.
    
    Fig 1: Identifying Line Pressure Inspection Port
    Courtesy of MAZDA MOTORS CORP.
    
    Fig 2: Identifying Oil Pressure Gauge Sets
    Courtesy of MAZDA MOTORS CORP.
3. Start the engine.
4. Warm-up the transaxle until the ATF temperature reaches at 60-70°C {140-158°F}
5. Select the selector lever to D range.
6. Read the line pressure with the engine idle.
Perform the line pressure test at the engine idle at each position/range in the same manner.
Stop the engine
Perform the line pressure test with the engine stall at D range.
1. Replace the oil pressure gauge as following:
  - When using the oil pressure gauge set (49 0378 400C), replace the SST (49 B019 901B) with SST (49 B019 902A).
  - When using the oil pressure gauge set (49 D019 9A2), replace the SST (49 D019 908) with SST (49 D019 907).
    
    Fig 3: Identifying Oil Pressure Gauge Sets
    Courtesy of MAZDA MOTORS CORP.
2. Start the engine.
3. Firmly depress the brake pedal with the left foot.
4. 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 (5)-(6) within 5 s.
5. Gradually depress the accelerator pedal with the right foot.
6. When the engine speed no longer increases, quickly read the line pressure and release the accelerator pedal.
7. Select the selector lever to N position and let the engine idle for 1 mm or more to cool the ATF.

Perform the line pressure test with the engine stall at each position/range in the same manner.

If there is any malfunction, inspect the following "possible cause" according to the condition.

CONDITION & POSSIBLE CAUSE

Condition		Possible Cause
Low pressure	In all ranges	Worn oil pump Oil leakage from oil pump, control valve body, and/or transaxle case Pressure regulator valve sticking Pressure control solenoid A malfunction
	In D range and M range (1GR, 2GR)	Oil leakage from forward clutch hydraulic circuit
	In M range (2GR)	Oil leakage from 2-4 brake band hydraulic circuit
	In M range (1GR), R position	Oil leakage from low and reverse brake hydraulic circuit
	In R position	Oil leakage from reverse clutch hydraulic circuit
High pressure	In all ranges	Pressure regulator valve stuck Pressure control solenoid A malfunction

LINE PRESSURE

Test Condition		Specification (kPa {kgf/cm² , psi})
Idle	D range	330-470 {3.37-4.79, 47.9-68 1}
	M range (1GR, 2GR)	330-470 {3.37-4.79, 47.9-68 1}
	R position	490-710 {5 00-7.23, 71.1-102.0}
Stall	D range	1,200-1,320 {12.24-13.46, 174.1-191.4}
	M range (1GR, 2GR)	1,200-1,320 {12 24-13.46, 174.1-191.4}
	R position	1,850-2,120 {18.87-21.61, 268.4-307.4}

Stop the engine.
WARNING:
- Removing the square-head plug when the ATF is hot can be dangerous. Hot ATF can come out of the opening and badly burn you. Before removing the square-head plug, allow the ATF to cool.
Remove the SSTs.
NOTE:
- Do not reuse the square-head plug because it is coated.
Install a new square-head plug in the inspection port.
Tightening torque 4.8-9.8 N.m {49-99 kgf.cm, 43-86 in.lbf}