On Board Diagnostic (OBD) - 2.8l v6 Atq Audi A6 C5

Equipment

1. Data is transmitted between the control module and the VAS5051 tester or VAG1551 Scan Tool (ST) via operating mode "Rapid Data Transfer".
2. DTC memory is designed for permanent memory and is therefore not dependent on voltage supply.
3. Display of stored DTCs occurs after initiation of display mode. See «CHECK DTC MEMORY (FUNCTION 02) AND ERASE DTC MEMORY (FUNCTION 05)»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-28l-v6-atq__check-dtc-memory-function-02-and) .
4. DTC memory must be erased after malfunction is repaired. See «CHECK DTC MEMORY (FUNCTION 02) AND ERASE DTC MEMORY (FUNCTION 05)»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-28l-v6-atq__check-dtc-memory-function-02-and) .

Note. Readiness code must be re -generated after every time DTC memory is erased. See READINESS CODE, GENERATING .

1. If the ECM recognizes malfunctions that lead to a degradation of emissions values, it indicates them by lighting the Malfunction Indicator Lamp -K83- (exhaust warning lamp). Clarification of this lamp, see «MALFUNCTION INDICATOR LAMP (MIL), SIGNIFICANCE»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-28l-v6-atq__malfunction-indicator-lamp-mil-significance) .
2. "EPC"-relevant malfunctions are also indicated in the instrument cluster by the warning lamp for Electronic Power Control ("EPC warning lamp").

Malfunction Indicator Lamp (MIL), significance

If the ECM recognizes malfunctions that lead to a degradation of emissions values, it indicates them by lighting the Malfunction Indicator Lamp for exhaust.

Identifying Malfunction Indicator Lamp. Scheme 72

Installation position of exhaust MIL

Note. The Malfunction Indicator Lamp (MIL) can blink or remain lit continuously. DTC memory should be checked in both cases. See CHECK DTC MEMORY (FUNCTION 02) AND ERASE DTC MEMORY (FUNCTION 05) .

1. Blinking: There is a malfunction that causes damage to the catalytic converter in this driving condition (e.g. combustion misfire). In this case, vehicle must only be driven at reduced power!
2. Continuously lit: There is a malfunction that causes increased emissions. Check DTC memory for Motronic ECM and automatic transmission (if installed).
3. If there are driveability problems or if there is a customer complaint and the exhaust MIL is not lit, DTC memory must be checked. There may be DTCs stored that do not cause the exhaust MIL to light up immediately, but only if malfunction is recognized again after repeated engine starts.

Scheme 73

Scheme 74

1. VAG1594A (Scheme 73): Identifying Special Tools (VAG1594A)
2. VAG1598/31 (Scheme 74): Identifying Special Tools (VAG1598/31)

Function test of warning lamp

1. Switch ignition on. Warning lamp for On Board Diagnostic (Malfunction Indicator Lamp -MIL-) must light up.

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

1. Connect VAG1598/31 test box at wiring harness to ECM, do not connect ECM. See «WIRE AND COMPONENT TEST USING VAG1598/31 TEST»(/audi/a6/c5-1997-2001/remont/fuel-system/#multiport-fuel-injection-mfi-28l-v6-atq__wire-and-component-test-using-vag159831) .
2. Bridge sockets 1 and 47 of test box.
3. Switch ignition on. Warning lamp must light up.

If warning lamp does not light up

1. Switch ignition off.
2. Remove instrument cluster: See «INSTRUMENTS - UP TO 2000»(/audi/a6/c5-1997-2001/remont/gauges-instrument-panels/#instruments-up-to-2000) or «INSTRUMENTS - 2001 AND UP»(ref-196300) .
3. Check following wire connection for open circuit and short circuit to B+: MIL CIRCUIT TEST Test box VAG1598/31 Socket Instrument Cluster Terminal 47 See appropriate system wiring diagram.
4. Repair open circuit or short circuit if necessary.

If wire connection is OK

1. Replace Engine Control Module (ECM). See «ENGINE CONTROL MODULE (ECM) (WITHOUT METAL ANTI-THEFT HOUSING), REPLACING»(/audi/a6/c5-1997-2001/remont/fuel-system/#multiport-fuel-injection-mfi-28l-v6-atq__engine-control-module-ecm-without-metal) .

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

1. Check DTC memory of Engine Control Module (ECM). See «CHECK DTC MEMORY (FUNCTION 02) AND ERASE DTC MEMORY (FUNCTION 05)»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-28l-v6-atq__check-dtc-memory-function-02-and) .

If no DTCs are stored

1. Connect VAG1598/31 test box at wiring harness to ECM, do not connect ECM. See «WIRE AND COMPONENT TEST USING VAG1598/31 TEST»(/audi/a6/c5-1997-2001/remont/fuel-system/#multiport-fuel-injection-mfi-28l-v6-atq__wire-and-component-test-using-vag159831) .
2. Remove instrument cluster: See «INSTRUMENTS - UP TO 2000»(/audi/a6/c5-1997-2001/remont/gauges-instrument-panels/#instruments-up-to-2000) or «INSTRUMENTS - 2001 AND UP»(ref-196300) .
3. Check following wire connection for short circuit to Ground (GND): MIL CIRCUIT TEST Test box VAG1598/31 Socket Instrument cluster Terminal 47 See appropriate system wiring diagram.
4. Repair short circuit if necessary.

If wire connection is OK

1. Replace Engine Control Module (ECM). See «ENGINE CONTROL MODULE (ECM) (WITHOUT METAL ANTI-THEFT HOUSING), REPLACING»(/audi/a6/c5-1997-2001/remont/fuel-system/#multiport-fuel-injection-mfi-28l-v6-atq__engine-control-module-ecm-without-metal) .

Safety precautions

If special testing equipment is required during road test, note the following

Test requirements

1. Fuses for engine electronics OK
2. Fuel Pump (FP) OK, checking. See «FUEL PUMP (FP) RELAY -J17- AND ACTIVATION, CHECKING»(/audi/a6/c5-1997-2001/remont/fuel-system/#multiport-fuel-injection-mfi-28l-v6-atq) .
3. Battery voltage at least 12.7 V
4. Ground (GND) connections at engine and transmission OK

Scheme 75

1. Connect VAS5051 tester to vehicle with VAS5051/1 diagnostic wire. Alternately, VAG1551 Scan Tool (ST) can also be attached using VAG1551/3B adapter. (Scheme 75): Connecting VAS5051 Tester To Vehicle DLC

Note. Data Link Connector (DLC) is located in front left knee bolster.

Note. The following description only explains implementation of On Board Diagnostic using VAG1551 Scan tool. When using the VAS5051 tester, observe the tester's instructions for use.

Indicated on display

Identifying VAG1551 Scan Tool Display - Connecting And Selecting Functions (1 Of 7). Scheme 76

Operating modes 1 and 2 are displayed alternately

Note. If nothing appears in display: Perform troubleshooting procedure after "troubleshooting procedure leak test"

Depending on desired function. See SELECTABLE FUNCTIONS .

1. Switch ignition on. or
2. Start engine.
3. Press -Print- button to turn on Scan Tool (ST) printer. Indicator lamp in button must light up.
4. Press button 1 to select "Rapid data transfer" operating mode 1.

When indicated on display

Identifying VAG1551 Scan Tool Display - Connecting And Selecting Functions (2 Of 7). Scheme 77

Note. The address word 00 initiates the automatic test sequence, i.e. it results in a DTC check on all OBD capable systems in the vehicle via rapid data transfer.

1. Press buttons -0- and -1- to select "engine electronics" and press -Q- button to confirm input.

VAG1551 Scan Tool (ST) display indicates control module identification. For example (Scheme 78)

Identifying VAG1551 Scan Tool Display - Connecting And Selecting Functions (3 Of 7). Scheme 78

Note. Control module identification can be printed by pressing the PRINT key of the VAG1551 scan tool.

Control module identification (example)

1. 3B0907551 BA part number; allocation See Parts Catalog
2. 2.8 L Engine displacement
3. V6/5V Construction style of engine (V engine, 6 cylinder, 5 valves)
4. "G" i.e. no indication Vehicle with or without cruise control system
5. 0003 Data version (software version) of control module
6. Coding 07252 Control module coding
7. WSC 12345 Factory identification of VAG1551, with which the last coding was performed

Scheme 79

1. Press right arrow button. (Scheme 79): Identifying VAG1551 Scan Tool Display - Connecting And Selecting Functions (4 Of 7)

Procedure, continued

Note. It will be possible to display the control module identification again after pressing buttons -0- and -1- to select "Check Control Module Versions" and confirming with the -Q- button. When indicated on display: (Scheme 80): Identifying VAG1551 Scan Tool Display - Connecting And Selecting Functions (5 Of 7)

Scheme 80

1. Perform troubleshooting procedure after "troubleshooting procedure leak test": Indicated on display see scheme 10: Identifying VAG1551 Scan Tool Display - Connecting And Selecting Functions (6 Of 7)

Indicated on display

Identifying VAG1551 Scan Tool Display - Connecting And Selecting Functions (7 Of 7). Scheme 81

Selectable functions

VAG1551 SCAN TOOL SELECTABLE FUNCTIONS

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

1. Connect VAS5051 tester or VAG1551 scan tool and select control module for engine electronics using "address word" 01 «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) .

Engine must run at idle for this.

Note. If engine doesn't start, crank engine using starter for at least 5 seconds. Do not switch ignition off afterward under any circumstance.

When indicated on display

Identifying VAG1551 Scan Tool Display - Check DTC Memory And Erase DTC Memory (1 Of 8). Scheme 82

1. Press buttons -0- and -2- to select "Check DTC memory" and press - Q- button to confirm input.

When indicated on display

Identifying VAG1551 Scan Tool Display - Check DTC Memory And Erase DTC Memory (2 Of 8). Scheme 83

1. Press right arrow button.

or

When indicated on display

Identifying VAG1551 Scan Tool Display - Check DTC Memory And Erase DTC Memory (3 Of 8). Scheme 84

When printer is switched on, stored DTCs are shown in sequence and printed.

1. Find printed DTCs in DTC table and repair. See «DIAGNOSTIC TROUBLE CODE (DTC) TABLE»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-28l-v6-atq__diagnostic-trouble-code-dtc-table) .

Note. If there are no DTCs in DTC memory, DTC memory should not be unnecessarily erased or else readiness code will be lost. If DTC memory was erased, readiness code must be re - generated. See READINESS CODE, GENERATING .

1. Press --> button.

When indicated on display

Identifying VAG1551 Scan Tool Display - Check DTC Memory And Erase DTC Memory (4 Of 8). Scheme 85

1. Press buttons -0- and -5- to select "Erase DTC memory" and press - Q- button to confirm input.

Note. When indicated on display

Identifying VAG1551 Scan Tool Display - Check DTC Memory And Erase DTC Memory (5 Of 8). Scheme 86

Procedure was not followed exactly .

1. Check DTC memory .

DTC memory will not be erased under the following conditions

1. Ignition switched off after DTC memory was checked .
2. A static malfunction was not repaired .

When indicated on display

Identifying VAG1551 Scan Tool Display - Check DTC Memory And Erase DTC Memory (6 Of 8). Scheme 87

1. Press --> button.
2. Check DTC memory again after repair work and erase it if necessary.

Note. This causes DTCs to be erased that were stored during repair of malfunction, e.g. because harness connectors were disconnected.

1. If DTC memory was erased, readiness code must be re -generated. See «READINESS CODE, GENERATING»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-28l-v6-atq) .

End Output

When indicated on display

Identifying VAG1551 Scan Tool Display - Check DTC Memory And Erase DTC Memory (7 Of 8). Scheme 88

1. Press buttons -0- and -6- to select "End output" and press -Q- button to confirm input.

When indicated on display

Identifying VAG1551 Scan Tool Display - Check DTC Memory And Erase DTC Memory (8 Of 8). Scheme 89

1. Switch off ignition and disconnect diagnostic cable.

Diagnostic Trouble Code (DTC) table

Note. When malfunctions occur in monitored sensors or components, Diagnostic Trouble Codes (DTCs) are stored in DTC memory with a description of the malfunction type. "EPC"-relevant malfunctions are also indicated in the instrument cluster by the warning lamp for Electronic Power Control ("EPC warning lamp"). See ELECTRONIC ENGINE POWER CONTROL (EPC), CHECKING . Malfunctions that worsen emissions are also indicated by an exhaust warning lamp (MIL for output DTM) that is also located in the instrument cluster. There are malfunctions that cause the exhaust warning lamp to light up immediately after recognition. Malfunctions can also occur that do not cause the exhaust MIL to light up immediately, but only if malfunction is recognized again after repeated engine starts. The DTC table is organized by the 5 digit code at left. If a stored DTC does not recur within the next 40 warm -up cycles, the DTC will be erased automatically. Malfunctions that occur only sporadically (temporary malfunctions) are are identified by the letters "SP" (sporadic malfunction) on the VAG1551 scan tool display. The word sporadic means "appearing or occurring at irregular intervals, occasional". Do not immediately replace components that the VAG1551/VAS5051 suggests are faulty, instead: Check wire connections and harness connectors to these components according to wiring diagram. Also check Ground (GND) connections according to wiring diagram. This is particularly valid when malfunctions are displayed as "sporadically occurring" (SP). If the connector is disconnected from the ECM or the battery is disconnected, all adaptation values in the control module are erased. DTC memory content will remain intact however. If the engine is started after this, a rough, uneven idle can result. In this case, engine must be allowed to run at idle for a few minutes until adaptation procedure has been completed. After erasing DTC memory ( CHECK DTC MEMORY (FUNCTION 02) AND ERASE DTC MEMORY (FUNCTION 05) ), readiness code must be re -generated. See READINESS CODE, GENERATING .

DIAGNOSTIC TROUBLE CODES (P0101 TO P0118)

DIAGNOSTIC TROUBLE CODES (P0130 TO P0134)

DIAGNOSTIC TROUBLE CODES (P0136 TO P0140)

DIAGNOSTIC TROUBLE CODES (P0150 TO P0154)

DIAGNOSTIC TROUBLE CODES (P0156 TO P0219)

DIAGNOSTIC TROUBLE CODES (P0300 TO P0306)

DIAGNOSTIC TROUBLE CODES (P0321 TO P346)

DIAGNOSTIC TROUBLE CODES (P0420 & P0421)

Note. The primary catalytic converters are located between the oxygen sensors of the appropriate cylinder bank. They are not immediately visible after vehicle is raised; they are the two, slightly smaller catalytic converters located closer to the engine.

DIAGNOSTIC TROUBLE CODES (P0430 & P0431)

Note. The primary catalytic converters are located between the oxygen sensors of the appropriate cylinder bank. They are not immediately visible after vehicle is raised; they are the two, slightly smaller catalytic converters located closer to the engine.

DIAGNOSTIC TROUBLE CODES (P0441 TO P0456)

DIAGNOSTIC TROUBLE CODES (P0501 TO P0563)

DIAGNOSTIC TROUBLE CODES (P0571 TO P1110)

DIAGNOSTIC TROUBLE CODES (P1111 TO P1114)

DIAGNOSTIC TROUBLE CODES (P1115 TO P1122)

DIAGNOSTIC TROUBLE CODES (P1127 TO P1131)

Note. mult. = multiplicative, means that malfunction is valid across entire range of engine speed and engine load.

DIAGNOSTIC TROUBLE CODES (P1136 TO P1140)

Note. add = additive, means that malfunction is only valid at closed throttle (idle).

DIAGNOSTIC TROUBLE CODES (P1141 TO P1148)

DIAGNOSTIC TROUBLE CODES (P1149 TO P1173)

DIAGNOSTIC TROUBLE CODES (P1176 TO P1218)

DIAGNOSTIC TROUBLE CODES (P1225 TO P1230)

DIAGNOSTIC TROUBLE CODES (P1237 TO P1242)

DIAGNOSTIC TROUBLE CODES (P1250 & P1296)

DIAGNOSTIC TROUBLE CODES (P1325 TO P1330)

DIAGNOSTIC TROUBLE CODES (P1335 TO P1347)

DIAGNOSTIC TROUBLE CODES (P1386 TO P1392)

DIAGNOSTIC TROUBLE CODES (P1393 TO P1411)

Note for DTC codes 17801, 17802, 17803

The terms "ignition output 1", "ignition output 2" and "ignition output 3" refer to the outputs on the Engine Control Module (ECM), via which the Engine Control Module (ECM) activates the power output stages at the ignition coil .

DIAGNOSTIC TROUBLE CODES (P1414 TO P1423)

DIAGNOSTIC TROUBLE CODES (P1424 TO P1473)

DIAGNOSTIC TROUBLE CODES (P1475 TO P1479)

DIAGNOSTIC TROUBLE CODES (P1501 TO P1523)

DIAGNOSTIC TROUBLE CODES (P1529 TO P1544)

DIAGNOSTIC TROUBLE CODES (P1545 TO P1568)

DIAGNOSTIC TROUBLE CODES (P1569 TO P1602)

DIAGNOSTIC TROUBLE CODES (P1603 TO P1609)

DIAGNOSTIC TROUBLE CODES (P1386 TO P1626)

DIAGNOSTIC TROUBLE CODES (P1630 TO P1640)

DIAGNOSTIC TROUBLE CODES (P1648 TO P1853)

Note. DTCs P1912, P1913, and P1914 can only occur on vehicles with automatic transmission.

DIAGNOSTIC TROUBLE CODES (P1912 TO P3262)

Output Diagnostic Test Mode (DTM) (function 03)

Note. Output Diagnostic Test Mode (DTM) is only possible with engine idle and ignition switched on. Output Diagnostic Test Mode (DTM) is aborted if engine is started or an RPM signal is recognized. In output Diagnostic Test Mode (DTM), individual actuators (with the exception of the fuel injectors) are activated for approximately 1 minute unless the next actuator is selected earlier by pressing the button. Actuators are checked either acoustically or by touch. The electric Fuel Pump (FP) runs during all of output Diagnostic Test Mode (DTM). Engine must be started before repeating output Diagnostic Test Mode (DTM). (ECM must recognize an engine speed of above 300 RPM).

Output Diagnostic Test Mode (DTM) activates the following components in the specified sequence

OUTPUT DIAGNOSTIC TEST MODE ACTIVATION SEQUENCE

Test requirement

1. Fuses for engine electronics OK

Test sequence

1. 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

1. 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

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

1. Confirm input using -Q- button.

Note. The Fuel Pump (FP) relay must trigger, the Fuel Pump (FP) must run, flowing noise at fuel pressure regulator is clearly audible. If Fuel Pump (FP) does not run, check activation. See CHECK VOLTAGE SUPPLY OF FUEL PUMP (FP) RELAY .

Indicated on display

Identifying VAG1551 Scan Tool Display - EVAP Canister Purge Regulator Valve. Scheme 92

(Indicated on VAG1551: from EVAP canister purge regulator valve - N80-)

This valve is activated for approx. 1 minute (clicks), unless - button is pressed first to switch to the next actuator.

If valve is not activated (does not click)

1. Check Evaporative Emission (EVAP) canister purge regulator valve - N80-. See «EVAPORATIVE EMISSION (EVAP) CANISTER PURGE REGULATOR VALVE - N80-, CHECKING»(/audi/a6/c5-1997-2001/remont/fuel-system/#multiport-fuel-injection-mfi-28l-v6-atq) .

1. Press -->button. see scheme 23: Identifying VAG1551 Scan Tool Display - Secondary Air Injection (AIR) Solenoid Valve

Indicated on display

This valve is activated for approx. 1 minute (clicks), unless -->- button is pressed first to switch to the next actuator.

If valve is not activated (does not click)

1. Check Secondary Air Injection (AIR) solenoid valve -N112

See SECONDARY AIR INJECTION (AIR) SYSTEM .

Activating the Secondary Air Injection (AIR) pump relay

1. Press -->button.

Indicated on display

Identifying VAG1551 Scan Tool Display - Secondary Air Injection (AIR) Pump Relay. Scheme 93

The Secondary Air Injection (AIR) pump relay -J299- (in 3 -socket relay carrier in the E-box, at left in the plenum chamber, position 2) switches the Secondary Air Injection (AIR) pump motor -V101- on for approx. 1 minute in intervals unless the next actuator is selected first by pressing the -->button.

If the Secondary Air Injection (AIR) pump motor -V101- does not run in intervals

1. Check Secondary Air Injection (AIR) pump relay -J299

See SECONDARY AIR INJECTION (AIR) SYSTEM .

Activating intake manifold change-over valve

1. Press -->button.

Indicated on display

Identifying VAG1551 Scan Tool Display - Intake Manifold Change-Over Valve. Scheme 94

This valve is activated for approx. 1 minute (clicks), unless -->- button is pressed first to switch to the next actuator.

1. If valve is not activated (does not click)

1. Check intake manifold change-over valve -N156-. See «INTAKE MANIFOLD CHANGE-OVER»(/audi/a6/c5-1997-2001/remont/fuel-system/#multiport-fuel-injection-mfi-28l-v6-atq__intake-manifold-change-over) .

Activating camshaft adjustment valves

1. Press --> button.

Indicated on display

Identifying VAG1551 Scan Tool Display - Camshaft Adjustment Valves. Scheme 95

Valve -1- for camshaft adjustment -N205- and valve -2- for camshaft adjustment -N208- are activated for approximately 1 minute (they click) unless output Diagnostic Test Mode (DTM) is ended first by pressing the " button

If valves are not activated (do not click).

1. Check camshaft adjustment valves

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

1. Press -->button.

Indicated on display

Identifying VAG1551 Scan Tool Display - Activating Leak Detection Pump. Scheme 96

Th change-over valve in the LDP is activated for approximately 1 minute (clicks), unless button is pressed first to switch to the next actuator.

Note. The click can be heard by listening near the rear left wheelhousing.

If valve is not activated (does not click)

Repair Manual, Fuel Supply System, Repair Group 20; components of the EVAP canister system, servicing; Leak Detection Pump (LDP) -V144-, checking.

Activating fuel injectors

Note. Fuel injectors are activated according to ignition sequence: Cyl. 1, Cyl. 4, Cyl. 3, Cyl 6 Cyl. 2, Cyl 5.

1. Press -->button.

Indicated on display

Identifying VAG1551 Scan Tool Display - Activating Fuel Injectors (1 Of 14). Scheme 97

1. Press -->button.

Indicated on display

Identifying VAG1551 Scan Tool Display - Activating Fuel Injectors (2 Of 14). Scheme 98

1. Fuel injector must click 5 times after arrow button is pressed.

If injector does not click

1. Check fuel injectors. See «FUEL INJECTORS, CHECKING»(/audi/a6/c5-1997-2001/remont/fuel-system/#multiport-fuel-injection-mfi-28l-v6-atq) .
2. Press -->button.

Indicated on display

Identifying VAG1551 Scan Tool Display - Activating Fuel Injectors (3 Of 14). Scheme 99

1. Press -->button.

Indicated on display

Identifying VAG1551 Scan Tool Display - Activating Fuel Injectors (4 Of 14). Scheme 100

1. Fuel injector must click 5 times after arrow button is pressed.

If injector does not click

1. Check fuel injectors. See «FUEL INJECTORS, CHECKING»(/audi/a6/c5-1997-2001/remont/fuel-system/#multiport-fuel-injection-mfi-28l-v6-atq) .
2. Press -->button.

Indicated on display

Identifying VAG1551 Scan Tool Display - Activating Fuel Injectors (5 Of 14). Scheme 101

1. Press -->button.

Indicated on display

Identifying VAG1551 Scan Tool Display - Activating Fuel Injectors (6 Of 14). Scheme 102

1. Fuel injector must click 5 times after arrow button is pressed.

If injector does not click

1. Check fuel injectors. See «FUEL INJECTORS, CHECKING»(/audi/a6/c5-1997-2001/remont/fuel-system/#multiport-fuel-injection-mfi-28l-v6-atq) .
2. Press -->button.

Indicated on display

Identifying VAG1551 Scan Tool Display - Activating Fuel Injectors (7 Of 14). Scheme 103

1. Press -->button.

Indicated on display

Identifying VAG1551 Scan Tool Display - Activating Fuel Injectors (8 Of 14). Scheme 104

Fuel injector must click 5 times after arrow button is pressed.

If injector does not click

1. Check fuel injectors. See «FUEL INJECTORS, CHECKING»(/audi/a6/c5-1997-2001/remont/fuel-system/#multiport-fuel-injection-mfi-28l-v6-atq) .
2. Press -->button.

Indicated on display

Identifying VAG1551 Scan Tool Display - Activating Fuel Injectors (9 Of 14). Scheme 105

1. Press -->button.

Indicated on display

Identifying VAG1551 Scan Tool Display - Activating Fuel Injectors (10 Of 14). Scheme 106

1. Fuel injector must click 5 times after arrow button is pressed.

If injector does not click

1. Check fuel injectors. See «FUEL INJECTORS, CHECKING»(/audi/a6/c5-1997-2001/remont/fuel-system/#multiport-fuel-injection-mfi-28l-v6-atq) .
2. Press -->button.

Indicated on display

Identifying VAG1551 Scan Tool Display - Activating Fuel Injectors (11 Of 14). Scheme 107

1. Press -->button.

Indicated on display

Identifying VAG1551 Scan Tool Display - Activating Fuel Injectors (12 Of 14). Scheme 108

Fuel injector must click 5 times after arrow button is pressed.

If injector does not click

1. Check fuel injectors. See «FUEL INJECTORS, CHECKING»(/audi/a6/c5-1997-2001/remont/fuel-system/#multiport-fuel-injection-mfi-28l-v6-atq) .

Indicated on display

Identifying VAG1551 Scan Tool Display - Activating Fuel Injectors (13 Of 14). Scheme 109

1. Press -->button.

Indicated on display (function selection)

Identifying VAG1551 Scan Tool Display - Activating Fuel Injectors (14 Of 14). Scheme 110

Note. Before re -initiating output Diagnostic Test Mode (DTM), engine must be started and the ignition must be switched off and on again.

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

1. Adapt throttle valve control module to Engine Control Module (ECM) Display group 060. See «THROTTLE VALVE CONTROL MODULE, ADAPTING»(/audi/a6/c5-1997-2001/remont/fuel-system/#multiport-fuel-injection-mfi-28l-v6-atq__throttle-valve-control-module-adapting) .
2. Vehicles with automatic transmission: Adaptation of kick down function of accelerator pedal position sensor to ECM Display group 063. See «KICK DOWN FUNCTION, ADAPTING»(/audi/a6/c5-1997-2001/remont/fuel-system/#multiport-fuel-injection-mfi-28l-v6-atq__kick-down-function-adapting) .

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

1. Adaptation of oxygen sensor control. See «CHECKING OXYGEN SENSOR ADAPTATION VALUES AND CONTROL»(/audi/a6/c5-1997-2001/remont/fuel-system/#multiport-fuel-injection-mfi-28l-v6-atq__checking-oxygen-sensor-adaptation-values-and) .
2. Troubleshooting via targeted activation and deactivation of oxygen sensor control Display group 099. For this, observe notes on «TEST REQUIREMENTS»(/audi/a6/c5-1997-2001/remont/fuel-system/#multiport-fuel-injection-mfi-28l-v6-atq) .

Test requirements for operations with engine running

1. No DTCs in DTC memory.
2. Coolant Temperature at least 80° C.
3. Electrical consumers switched off (coolant fan must NOT run during test).
4. A/C switched off.

1. Connect VAS5051 tester or VAG1551 scan tool and select control module for engine electronics using "address word" 01 «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) . Engine must run at idle for this.
2. Check DTC Memory. See «CHECK DTC MEMORY (FUNCTION 02) AND ERASE DTC MEMORY (FUNCTION 05)»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-28l-v6-atq__check-dtc-memory-function-02-and) . There must not be any DTCs stored, repair malfunctions if necessary, erase DTC memory, switch engine off and start again, road test vehicle and check DTC memory again as a control measure.

Depending on desired operation

1. Switch ignition on. or
2. Start engine.

When indicated on display

Identifying VAG1551 Scan Tool Display - Basic Setting (1 Of 4). Scheme 111

1. Press buttons -0- and -4- to select "Initiate basic setting" and press - Q- button to confirm input.

When indicated on display

Identifying VAG1551 Scan Tool Display - Basic Setting (2 Of 4). Scheme 112

1. Input desired display group number.

Example

1. Press buttons -0-, -0- and -0- to select "display group number 000" and press -Q- button to confirm input.

Note. After selecting this display group number, the EVAP valve is closed and A/C compressor switched off.

Indicated on display

Identifying VAG1551 Scan Tool Display - Basic Setting (3 Of 4). Scheme 113

Note. For display group number 000, measured values are displayed as a decimal. Display can be printed out on the paper roll when printer is switched on. To switch to a different display group, proceed as follows: see scheme 45: Switching Display Group Table

1. Let engine run at idle for a few minutes, coolant temperature at least 80° C.
2. If specified values are obtained in all display fields, press button.

Indicated on display

Identifying VAG1551 Scan Tool Display - Basic Setting (4 Of 4). Scheme 114

Display Group 000 Chart. Scheme 115

Code Control Module (function 07)

If control module does not indicate coding corresponding to vehicle, or if control module has been replaced, code it as follows.

1. 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 - Code Control Module (1 Of 5). Scheme 116

1. Press buttons -0- and -7- to select "Code control module" and press -Q- button to confirm input.

When indicated on display

Identifying VAG1551 Scan Tool Display - Code Control Module (2 Of 5). Scheme 117

1. Input control module coding according to code table. See «CODING TABLE»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-28l-v6-atq__coding-table) .

Clarification of coding

ECM CODING CLARIFICATION

ECM CODING EXAMPLE

1. Confirm input using -Q- button.

VAG1551 Scan Tool (ST) display indicates control module identification. For coding example (Scheme 118)

Identifying VAG1551 Scan Tool Display - Code Control Module (3 Of 5). Scheme 118

Note. When indicated on display

Identifying VAG1551 Scan Tool Display - Code Control Module (4 Of 5). Scheme 119

An unauthorized code number was entered .

1. Press -->button. see scheme 52: Identifying VAG1551 Scan Tool Display - Code Control Module (5 Of 5)

Indicated on display (function selection)

Coding table

ECM CODING

Note. Electronic Stabilization Program is abbreviated as "ESP". Check the ESP switch in the center console to determine whether the vehicle is equipped with ESP. Anti-Slip Regulation is abbreviated as "ASR". The abbreviation "LEV" stands for Low Emission Vehicle.

1. Coolant Temperature at least 80 °C.
2. Electrical consumers switched off (coolant fan must NOT run during test).
3. A/C switched off.
4. Steering in "straight -ahead" position

1. 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) .

Engine must run at idle for this.

When indicated on display

Identifying VAG1551 Scan Tool Display - Read Measuring Value Block (1 Of 4). Scheme 120

1. Press buttons -0- and -8- to select "Read Measuring Value Block" and press -Q- button to confirm input.

When indicated on display

Identifying VAG1551 Scan Tool Display - Read Measuring Value Block (2 Of 4). Scheme 121

1. Enter desired three digit display group number and confirm by pressing -Q- button.

Note. Which display group should be chosen depends on current function and component tests.

Indicated on display for display group 000

Identifying VAG1551 Scan Tool Display - Read Measuring Value Block (3 Of 4). Scheme 122

Indicated on display (example) for display group 001

Identifying VAG1551 Scan Tool Display - Read Measuring Value Block (4 Of 4). Scheme 123

Note. Display can be printed out on the paper roll when printer is switched on. To switch to a different display group, proceed as follows

Switching Display Group Table. Scheme 124

Readiness code

The readiness code appears as an 8 -digit display in measuring value block 086, display field 1. Each of the 8 digits is allocated to a specific exhaust related system.

During a test sequence (which must be carried out in its entirity), On Board Diagnostic (OBD) checks the function of each of these systems and then changes the character assigned to it in the 8-digit display from a "1" to a "0".

When the readiness code is generated after a successfully completed test sequence, it reads "0 0 0 0 0 0 0 0" (measuring value block 086, display field 1).

If a single test is completed entirely, but indicated as "not OK", a DTC will be stored in DTC memory. See CHECK DTC MEMORY (FUNCTION 02) AND ERASE DTC MEMORY (FUNCTION 05) .

Readiness code is returned to "0 1 1 0 1 1 0 1" if

1. DTC memory was erased
2. a new Engine Control Module (ECM) was installed

In this case, readiness code must be re -generated. See READINESS CODE, GENERATING .

Note. During driving operation in various load conditions, exhaust relevant tests are performed by the control module within a "short trip" and readiness code is generated on its own. In this case, however, concluding control possibilities are not available, meaning that it will not be indicated whether all positions of the readiness code are set to "0".

1. 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 - Checking Readiness Code (1 Of 4). Scheme 125

1. Press buttons -0- and -8- to select "Read Measuring Value Block" and press -Q- button to confirm input.

When indicated on display

Identifying VAG1551 Scan Tool Display - Checking Readiness Code (2 Of 4). Scheme 126

1. Press buttons -0-, -8- and -6- to select "display group number 086" and press -Q- button to confirm input.

When indicated on display

Identifying VAG1551 Scan Tool Display - Checking Readiness Code (3 Of 4). Scheme 127

1. Check readiness code in display field 1 Specification: 0 0 0 0 0 0 0 0

DISPLAY GROUP 086: READINESS CODE

Note for display field 1

Display field 1 is the most important. This indicates which system was checked via On Board Diagnostic (OBD) since the last time DTC memory was erased or a new control module was implemented. After DTC memory is erased, all testable values are set to 1, after the test is performed, the values are set to 0 .

Identifying Readiness Code Chart. Scheme 128

Note. Readiness code is not generated until all indications in display field 1 show "0"

Once the specified value "0 0 0 0 0 0 0 0" is reached in display field 1

1. Press -->button.

Indicated on display (function selection)

Identifying VAG1551 Scan Tool Display - Checking Readiness Code (4 Of 4). Scheme 129

1. Check DTC memory as a control measure. See «CHECK DTC MEMORY (FUNCTION 02) AND ERASE DTC MEMORY (FUNCTION 05)»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-28l-v6-atq__check-dtc-memory-function-02-and) (no malfunctions may be stored).

If specified value is not obtained

1. Generate readiness code. See «READINESS CODE, GENERATING»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-28l-v6-atq) .

1. VAG1788/10 RPM adjuster see scheme 63: Identifying Special Tools (VAG1788/10)

Requirements

1. Electrical consumers switched off (radiator fan must NOT run during test).
2. A/C system switched on.
3. Vehicles with automatic transmission Selector lever in P or N.
4. Coolant temperature at least 80 °C Display group 4, display field 3. Important: Drive engine warm via road test if possible.

Note. If, during a work step, the test result is indicated as "OK" immediately after selecting a display group, the test has already been carried out and it is OK to continue on to the next work step.

1. Ignition switched on.

1. 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) .

When indicated on display

Identifying VAG1551 Scan Tool Display - Check DTC Memory (1 Of 2). Scheme 130

1. Press buttons -0- and -2- to select "Check DTC memory" and press - Q- button to confirm input.

Number of stored DTCs or "No DTC recognized" will be indicated on display.

Identifying VAG1551 Scan Tool Display - Check DTC Memory (2 Of 2). Scheme 131

If a DTC is stored

1. Repair malfunction, erase DTC memory. Road test vehicle and then check DTC memory as a control measure.

If no DTCs are stored

1. Press -->button.

1. Engine not running, ignition switched on.

When indicated on display

Identifying VAG1551 Scan Tool Display - Erase DTC Memory (1 Of 2). Scheme 132

1. Press buttons -0- and -5- to select "Erase DTC memory" and press - Q- button to confirm input.

Note. When DTC memory is erased, readiness code is reset and must therefore be re -generated.

Identifying VAG1551 Scan Tool Display - Erase DTC Memory (2 Of 2). Scheme 133

When indicated on display

1. Press -->button.

1. Engine not running, ignition switched on.

When indicated on display

Identifying VAG1551 Scan Tool Display - Adapt Throttle Valve Control Module To Engine Control Module (1 Of 3). Scheme 134

1. Press buttons -0- and -4- to select "Initiate basic setting" and press - Q- button to confirm input.

When indicated on display

Identifying VAG1551 Scan Tool Display - Adapt Throttle Valve Control Module To Engine Control Module (2 Of 3). Scheme 135

1. Press buttons -0-, -6- and -0- to select "display group number 060" and press -Q- button to confirm input.

When indicated on display

Identifying VAG1551 Scan Tool Display - Adapt Throttle Valve Control Module To Engine Control Module (3 Of 3). Scheme 136

1. Check specified value in display field 4.

DISPLAY GROUP 060: ADAPTATION OF THROTTLE VALVE CONTROL MODULE

Note for display field 3

Different numbers are shown in display field 3 during adaptation that represent the current adaptation condition. It is not particularly important how the adaptation step counter (display field 3) behaves during adaptation, but rather that display field 4 indicates the specification "ADP OK" after adaptation .

If specified value "ADP OK" is obtained

1. Press -C- button.

1. Engine not running, ignition switched on.

When indicated on display

Identifying VAG1551 Scan Tool Display - Kick Down Function (1 Of 2). Scheme 137

1. Press buttons -0-, -6- and -3- to select "display group number 063" and press -Q- button to confirm input.

When indicated on display

Identifying VAG1551 Scan Tool Display - Kick Down Function (2 Of 2). Scheme 138

Note. There will be a prompt: "Activate kick-down"

1. Depress accelerator pedal completely, past kick down point, and hold down.

Note. During adaptation of the kick down point, the VAG1551 will display "Kick down ADP in progress". After successful adaptation of the kick down point, the VAG1551 will display "Kick down ADP OK".

1. Check specified value in display field 4.

DISPLAY GROUP 063: KICK DOWN FUNCTION, ADAPTING

Note for display field 4

"ERROR" can be indicated, for example, if the accelerator pedal is not immediately pressed in response to a request by the tester or if the accelerator pedal is released while adaptation is running despite the fact that adaptation is not yet complete .

In both cases, "Basic Setting" must be exited and the adaptation must be performed again .

If specified value "ADP OK" is obtained

1. Press -C- button.

Work step 5: Check operating condition of oxygen sensor control

1. Start engine (for a vehicle with manual transmission: engage clutch).

Note. After starting engine, it may be necessary to select the Engine Control Module (ECM) again using "address word" 01 and the function "Initiate basic setting" using "04".

1. Install VAG1788/10 RPM adjuster on accelerator pedal and raise engine speed. Specification: 2200 RPM

When indicated on display

Identifying VAG1551 Scan Tool Display - Check Operating Condition Of Oxygen Sensor Control (1 Of 2). Scheme 139

1. Press buttons -0-, -3- and -0- to select "display group number 030" and press -Q- button to confirm input.

When indicated on display

Identifying VAG1551 Scan Tool Display - Check Operating Condition Of Oxygen Sensor Control (2 Of 2). Scheme 140

1. Check oxygen sensor status in display fields 1 to 4.

Note. A few minutes may pass until a diagnostic result is reached.

DISPLAY GROUP 030: OXYGEN SENSOR STATUS WITH ENGINE AT IDLE

Significance of 3 digit indications in display group 030

SIGNIFICANCE OF 3 DIGIT INDICATIONS IN DISPLAY GROUP 030

1. Engine continues to run at 2200 RPM.

When indicated on display

Identifying VAG1551 Scan Tool Display - Oxygen Sensor Aging Before Catalytic Converter (1 Of 4). Scheme 141

1. Press buttons -0-, -3- and -4- to select "display group number 034" and press -Q- button to confirm input.

When indicated on display

Identifying VAG1551 Scan Tool Display - Oxygen Sensor Aging Before Catalytic Converter (2 Of 4). Scheme 142

1. Check specified value in display field 4 after indication "Test ON" appears

Note. A few minutes may pass until a diagnostic result is reached.

DISPLAY GROUP 034: OXYGEN SENSOR AGING DIAGNOSTIC, OXYGEN SENSOR BEFORE CATALYTIC CONVERTER (BANK 1)

If specified value "B1 -S1 OK" is obtained

1. Press -C- button.

When indicated on display

Identifying VAG1551 Scan Tool Display - Oxygen Sensor Aging Before Catalytic Converter (3 Of 4). Scheme 143

1. Press buttons -0-, -3- and -5- to select "display group number 035" and press -Q- button to confirm input.

If specified value "B2-S1 OK" is obtained

Identifying VAG1551 Scan Tool Display - Oxygen Sensor Aging Before Catalytic Converter (4 Of 4). Scheme 144

When indicated on display

1. Check specified value in display field 4.

DISPLAY GROUP 035: OXYGEN SENSOR AGING DIAGNOSTIC, OXYGEN SENSOR BEFORE CATALYTIC CONVERTER (BANK 2)

1. Press -C- button.

1. Engine continues to run at 2200 RPM.

When indicated on display

Identifying VAG1551 Scan Tool Display - Operational Readiness Of Oxygen Sensors Behind Catalytic Converter (1 Of 2). Scheme 145

1. Press buttons -0-, -3- and -6- to select "display group number 036" and press -Q- button to confirm input.

When indicated on display

1. Check specified values in display fields 2 and 4.

DISPLAY GROUP 036: OPERATIONAL READINESS OF THE OXYGEN SENSOR BEHIND CATALYTIC CONVERTER (BANK 1 AND BANK 2)

If specified value "B1 -S1 OK" is obtained

1. Press -C- button.

1. Engine continues to run at 2200 RPM.

When indicated on display

Identifying VAG1551 Scan Tool Display - Oxygen Sensor Control System (1 Of 4). Scheme 146

1. Press buttons -0-, -3- and -7- to select "display group number 037" and press -Q- button to confirm input.

When indicated on display

Identifying VAG1551 Scan Tool Display - Oxygen Sensor Control System (2 Of 4). Scheme 147

1. Check specified value in display field 4.

DISPLAY GROUP 037: DIAGNOSTIC OF OXYGEN SENSOR CONTROL SYSTEM (BANK 1)

If specified value "Syst. OK" is obtained

1. Press -C- button.

When indicated on display

Identifying VAG1551 Scan Tool Display - Oxygen Sensor Control System (3 Of 4). Scheme 148

1. Press buttons -0-, -3- and -8- to select "display group number 038" and press -Q- button to confirm input.

If specified value "Syst. OK" is obtained

When indicated on display

Identifying VAG1551 Scan Tool Display - Oxygen Sensor Control System (4 Of 4). Scheme 149

1. Check specified value in display field 4.

DISPLAY GROUP 038: DIAGNOSTIC OF OXYGEN SENSOR CONTROL SYSTEM (BANK 2)

1. Press -C- button.

1. Engine continues to run at 2200 RPM.

When indicated on display

Identifying VAG1551 Scan Tool Display - Oxygen Sensor Aging Behind Catalytic Converter (1 Of 4). Scheme 150

1. Press buttons -0-, -4- and -3- to select "display group number 043" and press -Q- button to confirm input.

When indicated on display

Identifying VAG1551 Scan Tool Display - Oxygen Sensor Aging Behind Catalytic Converter (2 Of 4). Scheme 151

1. Check specified value in display field 4.

DISPLAY GROUP 043: OXYGEN SENSOR AGING DIAGNOSTIC, OXYGEN SENSOR BEHIND CATALYTIC CONVERTER (BANK 1)

If specified value "B1 -S1 OK" is obtained

1. Press -C- button.

When indicated on display

Identifying VAG1551 Scan Tool Display - Oxygen Sensor Aging Behind Catalytic Converter (3 Of 4). Scheme 152

1. Press buttons -0-, -4- and -4- to select "display group number 044" and press -Q- button to confirm input.

If specified value B2-S2 OK" is obtained

When indicated on display

Identifying VAG1551 Scan Tool Display - Oxygen Sensor Aging Behind Catalytic Converter (4 Of 4). Scheme 153

1. Check specified value in display field 4.

DISPLAY GROUP 044: OXYGEN SENSOR AGING DIAGNOSTIC, OXYGEN SENSOR BEHIND CATALYTIC CONVERTER (BANK 2)

1. Press -C- button.

1. Engine continues to run at 2200 RPM.

When indicated on display

Identifying VAG1551 Scan Tool Display - Catalytic Converter (1 Of 4). Scheme 154

1. Press buttons -0-, -4- and -5- to select "display group number 046" and press -Q- button to confirm input.

When indicated on display

Identifying VAG1551 Scan Tool Display - Catalytic Converter (2 Of 4). Scheme 155

1. Check specified value in display field 4.

Note. Catalytic converter diagnostic lasts approx. 60 seconds.

DISPLAY GROUP 046: DIAGNOSTIC OF CATALYTIC CONVERTER (BANK 1)

If specified value "Cat B1 OK" is obtained

1. Press -C- button.

When indicated on display

Identifying VAG1551 Scan Tool Display - Catalytic Converter (3 Of 4). Scheme 156

1. Press buttons -0-, -4- and -7- to select "display group number 047" and press -Q- button to confirm input.

When indicated on display

Identifying VAG1551 Scan Tool Display - Catalytic Converter (4 Of 4). Scheme 157

1. Check specified value in display field 4.

DISPLAY GROUP 047: DIAGNOSTIC OF CATALYTIC CONVERTER (BANK 2)

If specified value "Cat B2 OK" is obtained

1. Press -C- button.

Work step 11: Diagnostic of tank ventilation valve

1. Remove VAG1788/10 RPM adjuster and leave engine running at idle.

When indicated on display

Identifying VAG1551 Scan Tool Display - Tank Ventilation Valve (1 Of 2). Scheme 158

1. Press buttons -0-, -7- and -0- to select "display group number 070" and press -Q- button to confirm input.

When indicated on display

Identifying VAG1551 Scan Tool Display - Tank Ventilation Valve (2 Of 2). Scheme 159

1. Check specified value in display field 4.

Note. If test is not initiated or if indication switches from "Test ON" to "Test OFF", depress accelerator pedal briefly, test will be repeated.

DISPLAY GROUP 070: DIAGNOSTIC OF TANK VENTILATION VALVE

If specified value "TVV OK" is obtained

1. Press -->button.

1. Engine running at idle
2. Intake Air Temperature (IAT) less than 95 °C display group 004, display field 4.
3. Coolant temperature at least 80 °C Display group 4, display field 3
4. Fuel filler cap opened briefly (to reduce pressure).

When indicated on display

Identifying VAG1551 Scan Tool Display - Tank Seal (1 Of 2). Scheme 160

1. Press buttons -0-, -7- and -1- to select "display group number 071" and press -Q- button to confirm input.

When indicated on display

Identifying VAG1551 Scan Tool Display - Tank Seal (2 Of 2). Scheme 161

Note. Test lasts approx. 90 seconds. When the diagnostic of tank seal is performed several times in a row, the fuel filler cap must be opened briefly before each test to release pressure.

1. Check specified value in display field 4 after indication "Test ON" appears

DISPLAY GROUP 071: DIAGNOSTIC OF TANK SEAL

If specified value "Syst. OK" is obtained

1. Press -C- button.

1. Engine running at idle

Note. During diagnostic of the Secondary Air Injection (AIR) system, the Secondary Air Injection (AIR) pump will run for several seconds.

When indicated on display

Identifying VAG1551 Scan Tool Display - Secondary Air Injection System (1 Of 3). Scheme 162

1. Press buttons -0-, -7- and -7- to select "display group number 077" and press -Q- button to confirm input.

When indicated on display

Identifying VAG1551 Scan Tool Display - Secondary Air Injection System (2 Of 3). Scheme 163

1. Check specified value in display field 4 after indication "Test ON" appears

Note. Secondary Air Injection (AIR) system test lasts approx. 60 seconds.

DISPLAY GROUP 077: SECONDARY AIR INJECTION (AIR) SYSTEM DIAGNOSTIC

If specified value "Syst. OK" is obtained

1. Press -->button.

Indicated on display (function selection)

Identifying VAG1551 Scan Tool Display - Secondary Air Injection System (3 Of 3). Scheme 164

Work step 14: Readiness code, reading

1. Read readiness code. See «READINESS CODE, CHECKING»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-28l-v6-atq) .

See also:
• WIRE AND COMPONENT TEST USING VAG1598/31 TEST
• INSTRUMENTS - UP TO 2000
• ENGINE CONTROL MODULE (ECM) (WITHOUT METAL ANTI-THEFT HOUSING), REPLACING
• FUEL PUMP (FP) RELAY -J17- AND ACTIVATION, CHECKING
• INTAKE AIR TEMPERATURE (IAT) SENSOR -G42-, CHECKING
• FUEL PRESSURE REGULATOR AND RESIDUAL PRESSURE, CHECKING
• EXHAUST SYSTEM COMPONENTS, REMOVING AND INSTALLING
• EVAP CANISTER SYSTEM
• VEHICLE SPEED SIGNAL, CHECKING
• THROTTLE VALVE CONTROL MODULE -J338 -, CHECKING
• BRAKE LIGHT SWITCH AND BRAKE PEDAL SWITCH, CHECKING
• CHECK OXYGEN SENSOR WIRES BANK 1 FOR HEATED OXYGEN SENSOR (HO2S) 2 -G39
• TESTING OXYGEN SENSOR WIRES
• CHECK OXYGEN SENSOR WIRES FOR OXYGEN SENSOR (O2S) 2 BEHIND THREE WAY CATALYTIC CONVERTER (TWC) -G131
• CHECKING OXYGEN SENSOR ADAPTATION VALUES AND CONTROL
• ELECTRONIC POWER CONTROL (EPC) WARNING LAMP -K132- IN INSTRUMENT CLUSTER, SIGNIFICANCE
• KNOCK RECOGNITION CONTROL STOP, CHECKING
• CHECK PHASE POSITION OF CAMSHAFT POSITION (CMP) SENSOR
• CHECKING ACTIVATION
• SECONDARY AIR INJECTION (AIR) SYSTEM
• ELECTRIC VACUUM PUMP
• INTAKE MANIFOLD CHANGE-OVER
• CLUTCH VACUUM VENT VALVE SWITCH -F36-, CHECKING
• THROTTLE VALVE CONTROL MODULE, ADAPTING
• CRUISE CONTROL SYSTEM, ON BOARD DIAGNOSTIC
• DATA TRANSFER BETWEEN ENGINE CONTROL MODULE (ECM) AND CAN CAPABLE CONTROL MODULES, CHECKING
• ON BOARD DIAGNOSTIC (OBD) - 5 SPD. AUTOMATIC TRANSMISSION 01V
• KICK DOWN FUNCTION, ADAPTING
• CHECK DTC MEMORY (FUNCTION 02) AND ERASE DTC MEMORY (FUNCTION 05)
• READINESS CODE, GENERATING
• MALFUNCTION INDICATOR LAMP (MIL), SIGNIFICANCE
• SAFETY PRECAUTIONS
• OUTPUT DIAGNOSTIC TEST MODE (DTM) (FUNCTION 03)
• END OUTPUT
• CODE CONTROL MODULE (FUNCTION 07)
• DIAGNOSTIC TROUBLE CODE (DTC) TABLE
• CODING TABLE