Home/Audi/A6/Audi A6 C5 (1997-2001)/Repair manual/On Board Diagnostic (OBD) - 2.8l v6 Atq/Test sequence

Contents

Wiring diagrams Section: On Board Diagnostic (OBD) - 2.8l v6 Atq

Equipment

Malfunction Indicator Lamp (MIL), significance

Function test of warning lamp

Warning lamp for On Board Diagnostic (Malfunction Indicator Lamp -MIL-) does not light up

Warning lamp for On Board Diagnostic (Malfunction Indicator Lamp -MIL-) remains lit constantly

Safety precautions

Test requirements

Control module identification (example)

Procedure, continued

Check DTC Memory (function 02) and Erase DTC Memory (function 05)

End Output

Diagnostic Trouble Code (DTC) table

Output Diagnostic Test Mode (DTM) (function 03)

Test requirement

Test sequence

Activating the EVAP canister purge regulator valve (tank vent valve)

Activating the Secondary Air Injection (AIR) pump relay

Activating intake manifold change-over valve

Activating camshaft adjustment valves

Activating Leak Detection Pump (diagnostic pump for tank ventilation system)

Activating fuel injectors

With ignition on and engine at standstill, the following operations can be performed using "function 04", basic setting

With ignition on and engine running, the following operations can be performed using basic setting

Test requirements for operations with engine running

Code Control Module (function 07)

Coding table

Readiness code

Requirements

Work step 5: Check operating condition of oxygen sensor control

Work step 11: Diagnostic of tank ventilation valve

Work step 14: Readiness code, reading

All sections

Test sequence Audi A6 C5

On Board Diagnostic (OBD) - 2.8l v6 Atq 2 illustrations ~102 words

Test sequence

Connect VAS5051 tester or VAG1551 scan tool and select control module for engine electronics using "address word" 01. See «VAS 5051 VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM ORVAG1551 SCAN TOOL (ST), CONNECTING AND SELECTING FUNCTIONS»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-28l-v6-atq) .

Ignition must remain switched on for this.

When indicated on display

Identifying VAG1551 Scan Tool Display - Output Diagnostic Test Mode (1 Of 2). Scheme 90

Scheme 90: Identifying VAG1551 Scan Tool Display - Output Diagnostic Test Mode (1 Of 2)

Scheme 90: Identifying VAG1551 Scan Tool Display - Output Diagnostic Test Mode (1 Of 2)

Press buttons -0- and -3- to select "output Diagnostic Test Mode" and press -Q- button to confirm input.

Indicated on display

Identifying VAG1551 Scan Tool Display - Output Diagnostic Test Mode (2 Of 2). Scheme 91

Scheme 91: Identifying VAG1551 Scan Tool Display - Output Diagnostic Test Mode (2 Of 2)

Scheme 91: Identifying VAG1551 Scan Tool Display - Output Diagnostic Test Mode (2 Of 2)