Modulating piston displacement sensor and quantity adjuster, checking: Checking
WARNING: This page is about a different car, the 1999 Volkswagen Jetta, 1998 Volkswagen Jetta, and 1997 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.
- Connect VAG1551 or VAG1552 scan tool, see VAG1551 SCAN TOOL (ST), CONNECTING .
- Start engine and let idle
- Press buttons -0- and -1- to insert the "Engine Electronics" address word 01.
Indicated on display
Fig 1: Scan Tool Display - Checking Modulating Piston Displacement Sensor And Quantity Adjuster (1 Of 4)
- Press buttons -0- and -8- to select "Read Measuring Value Block" function 08, and press -Q- button to confirm input.
Indicated on display
Fig 2: Scan Tool Display - Checking Modulating Piston Displacement Sensor And Quantity Adjuster (2 Of 4)
- Press buttons -0-, -0- and -1- to input display group no. 1 (001), and press -Q- button to confirm input.
Indicated on display
Fig 3: Scan Tool Display - Checking Modulating Piston Displacement Sensor And Quantity Adjuster (3 Of 4)
- Check engine coolant temperature value in display field 4.
- Specification: at least 85°C
NOTE: Continue only when temperature display is as specified. - Check voltage supply value in display field 3 (for modulating piston displacement sensor).Fig 4: Scan Tool Display - Checking Modulating Piston Displacement Sensor And Quantity Adjuster (4 Of 4)
Specification: 1.250 to 1.750 volts
If voltage is not as specified:
- Check modulating piston displacement sensor, see MODULATING PISTON DISPLACEMENT SENSOR, CHECKING .
- Check quantity adjuster, see QUANTITY ADJUSTER, CHECKING .