Quantity adjuster control range, 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 Quantity Adjuster Control Range (1 Of 5)

Press buttons -0- and -3- to select "Output Diagnostic Test Mode" function 03, and press -Q- button to confirm input.

Indicated on display

Fig 2: Scan Tool Display - Checking Quantity Adjuster Control Range (2 Of 5)

NOTE: Individual DTM components are activated for 30 seconds. Various work sequences must be carried out with the scan tool within this period as well as reading the displayed values. Read over the following work sequence first to familiarize yourself with the procedure.

Press -Q- button to confirm input.

Indicated on display

Fig 3: Scan Tool Display - Checking Quantity Adjuster Control Range (3 Of 5)

Press -C- button.
Press buttons -0- and -8- to select "Read Measuring Value Block" function 08.
Press -Q- button to confirm input.

Indicated on display

Fig 4: Scan Tool Display - Checking Quantity Adjuster Control Range (4 Of 5)

Press buttons -0-, -0- and -4- to input display group no. 4 (004).
Press -Q- button to confirm input.

Indicated on display

Fig 5: Scan Tool Display - Checking Quantity Adjuster Control Range (5 Of 5)

NOTE: The displays in display fields 3 and 4 must fluctuate within following control range:

Specification display field 3:
- Lower range: 1° ATDC to 4.0° BTDC
- Upper range: 14.0 to 17.4° BTDC
Specification display field 4:
- Lower range: 2 to 5%
- Upper range: 90 to 95%

NOTE: Due to the slow refresh rate of the VAG1551 scan tool, the displayed values can greatly vary. Ensure that the lowest value only in display field 3 lies between 1.0 and 4.0 and the highest value lies between 14.0 and 17.4. Ensure that the lowest value in display field 4 lies between 2 and 5, and the highest value between 90 and 95.

If the values are not as specified, check the cold start injector as follows:

Press --> button.
Press buttons -0- and -6- to select "End Output" function 06.
Press -Q- button to confirm input.
Switch ignition off.
Disconnect Diesel injection pump harness connector.
1. See DIESEL DIRECT FUEL INJECTION (DFI) SYSTEM COMPONENTS, OVERVIEW
Measure resistance between connector terminals 2 and 3.

Fig 6: Identifying Diesel Injection Pump Terminals

Specification: 12 to 20 ohms (ohm)

If resistance is not as specified:

Replace cold start injector -N108-.
1. See FUEL FILTER, SERVICING
Display readiness code, see READINESS CODE, DISPLAYING .

If DTC memory was erased:

Create readiness code again, see READINESS CODE, SETTING (UP TO M.Y. 1997) .

If resistance is OK:

Connect VAG1598/18 test box to Diesel DFI ECM connector.

Fig 7: Connecting VAG1598/18 Test Box To Diesel DFI ECM Connector
Check wiring for open circuit between test box and 3 -pin harness connector, using wiring diagrams:
- Terminal 2 and test box socket 51
- Terminal 3 and test box socket 68
- Wire resistance: max. 1.5 ohms (ohm)
Check wiring for short circuit between connector terminals.
Specification: INFINITY ohm (no continuity)

Fig 8: Identifying Diesel Injection Pump Harness Connector Terminals

If wiring is OK:

Replace Diesel DFI ECM -J248-, see item 3 .
Display readiness code, see READINESS CODE, DISPLAYING .

If DTC memory was erased:

Create readiness code again, see READINESS CODE, SETTING (UP TO M.Y. 1997) .