On Board Diagnostic (OBD), Generic Scan Tool (2.8l v6 Aha, Atq) Audi A6 C5

On Board Diagnostic (OBD), characteristics

The Engine Control Module (Motronic Engine Control Module (ECM) -J220-) is equipped with DTC memory.

If malfunctions occur at the exhaust relevant systems or components, they are stored in DTC memory with a description of the malfunction type.

The Engine Control Module (ECM) differentiates between different DTCs after evaluating the information. See DIAGNOSTIC TROUBLE CODE (DTC) TABLES .

The stored malfunctions can be checked with a standard diagnostic tester. See DIAGNOSTIC MODE 3: CHECK DTC MEMORY

When harness connectors are disconnected from the Engine Control Module (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, the readiness code must be generated again. See READINESS CODE, GENERATING .

The following work steps must be performed in the described sequence after the malfunction(s) have been repaired

1. Check DTC memory. See «DIAGNOSTIC MODE 3: CHECK DTC MEMORY»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) .
2. Erase DTC memory. See «DIAGNOSTIC MODE 4: RESET/ERASE DIAGNOSTIC DATA»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) .
3. For completion, generate readiness code. See «READINESS CODE, GENERATING»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) .

Control module identification

The control module version is displayed by selecting "Diagnostic mode 9: Vehicle information" under address word 33. See DIAGNOSTIC MODE 9: VEHICLE INFORMATION .

Engine Control Module (ECM) equipment

ENGINE CONTROL MODULE (ECM) EQUIPMENT

Selectable diagnostic modes under address word 33 - OBD

Note. The conditions required for selecting the desired diagnostic mode are listed in the following table

SELECTABLE DIAGNOSTIC MODES UNDER ADDRESS WORD 33 - OBD CHART

Identifying VAS 5052 Vehicle Diagnostic And Information System. Scheme 165

1. VAS 5052 Vehicle Diagnostic and Information System with
2. VAS 5052/3 diagnostic cable

Scheme 166

1. The respective fuses of the Motronic fuel injection and ignition system must be OK: (Scheme 166): Identifying Fuse Box
2. Battery voltage must be at least 11.5 volts.
3. All electrical consumers like, for example, lights and rear window heating must be switched off.
4. Parking brake must be engaged or else daylight driving lights will be switched on.
5. For vehicles with automatic transmission, selector lever must be in position -P- or -N-.
6. If vehicle is equipped with an A/C system, it must be switched off.
7. Ground (GND) connections between engine and chassis must be OK.
8. Ignition switched off.

Procedure

Connect diagnostic tester ((VAS 5052) using (VAS 5052/3) diagnostic cable as follows

Scheme 167

1. Connect diagnostic cable connector to Data Link Connector (DLC) - arrow-. (Scheme 167): Locating Data Link Connector
2. Depending on the desired diagnostic mode, it is necessary to: switch on ignition. or
3. Start engine. Go to selectable diagnostic modes under address word 33.

Note. Respective operation of the diagnostic tester: Operating instructions of the diagnostic tester If no display appears on diagnostic tester, check voltage supply at Diagnostic Link Connector (DLC).

Identifying VAG1598/22 Test Box. Scheme 168

1. VAG1598/22 test box

Identifying VAG1598/31 Test Box. Scheme 169

1. VAG1598/31 test box

Requirement

1. Ignition switched off.

Scheme 170

Scheme 171

Scheme 172

1. Pull off rubber seal of plenum chamber cover in direction of arrow. (Scheme 170): Pulling Off Rubber Seal Of Plenum Chamber Cover
2. Remove cover -1- toward front.
3. Remove securing screws at cover of protective housing for control modules -arrows- and remove cover. (Scheme 171): Removing Securing Screws At Cover Of Protective Housing For Control Modules
4. Using a screwdriver, carefully pry off retaining bracket (arrow). (Scheme 172): Prying Off Retaining Bracket Using Screwdriver
5. Remove Engine Control Module (ECM).
6. Then disengage connector from control module and disconnect.

Vehicles with 80-pin Engine Control Module (ECM, engine code AHA)

1. Connect VAG1598/22 test box at control module wiring harness.

Vehicles with 121-pin Engine Control Module (ECM, engine code ATQ)

1. Connect VAG1598/31 test box at control module wiring harness. Engine Control Module (ECM) is not connected.

Continuation for all vehicles

When harness connectors are disconnected from the Engine Control Module (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, the readiness code must be generated again. See READINESS CODE, GENERATING .

Meaning of exhaust MIL

The Malfunction Indicator Lamp (MIL) lights up when exhaust relevant malfunctions are recognized by the Engine Control Module (ECM).

Identifying Malfunction Indicator Lamp (MIL) In Instrument Cluster. Scheme 173

Installation position of exhaust MIL

Note. The Malfunction Indicator Lamp (MIL) can blink or remain lit continuously. DTC memory must be checked in each case. See DIAGNOSTIC MODE 3: CHECK DTC MEMORY . Blinking: There is a malfunction that causes damage to the catalytic converter in this driving condition. In this case, vehicle must only be driven at reduced power! Continuously lit: There is a malfunction that causes increased emissions. Check DTC memory for Motronic control module. DTC memory must still be checked if there are drivability problems or the customer has made a complaint but the MIL is not lit, because malfunctions can be stored without causing the MIL to light immediately.

Recommended special tools and equipment

1. VAG1526 multimeter or VAG1715 multimeter
2. VAG1594 connector test kit
3. Wiring diagram

Identifying Fuse Box. Scheme 174

1. The respective fuses of Malfunction Indicator Lamp (MIL) -K83-must be OK

Test sequence

1. Switch on ignition: exhaust MIL must light up.

If exhaust MIL does not light up when ignition is switched on

1. Switch ignition off.
2. Check wire from ECM to exhaust MIL as follows
3. Connect test box to control module wiring harness. See «TEST BOX, CONNECTING FOR WIRING TEST»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) , connect test box for wiring test.

Vehicles with engine code AHA

1. Bridge sockets 2+17 of test box with the respective adapter cables.

Vehicles with engine code ATQ

1. Bridge sockets 2+47 of test box with the respective adapter cables.

1. Switch on ignition: exhaust MIL must light up.

If Malfunction Indicator Lamp (MIL) 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 wire connection from Engine Control Module (ECM) to Malfunction Indicator Lamp (MIL) -K83-according to wiring diagram
4. Erase DTC memory of Engine Control Module (ECM). See «DIAGNOSTIC MODE 4: RESET/ERASE DIAGNOSTIC DATA»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) .
5. Generate readiness code. See «READINESS CODE, GENERATING»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) . If no malfunctions are detected in wire from Engine Control Module (ECM) to Malfunction Indicator Lamp (MIL)
6. Replace Motronic Engine Control Module (ECM) -J220-. See «ENGINE CONTROL MODULE (ECM), REPLACING»(/audi/a6/c5-1997-2001/remont/fuel-system/#multiport-fuel-injection-mfi-generic-scan-tool-28l-v6-aha-atq__engine-control-module-ecm-replacing) . If exhaust MIL lights up when ignition is switched on
7. Start engine and let run at idle: Exhaust MIL must go out after a few seconds.

If Malfunction Indicator Lamp (MIL) does not go out

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. Connect test box to control module wiring harness. See «TEST BOX, CONNECTING FOR WIRING TEST»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) .

1. Check wire connection between test box socket 17 and instrument cluster for short circuit to Ground (GND) according to wiring diagram

1. Check wire connection between test box socket 47 and instrument cluster for short circuit to Ground (GND) according to wiring diagram

1. Erase DTC memory of Engine Control Module (ECM). See «DIAGNOSTIC MODE 4: RESET/ERASE DIAGNOSTIC DATA»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) .
2. Generate readiness code. See «READINESS CODE, GENERATING»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) . If no malfunctions are detected in wire from Engine Control Module (ECM) to Malfunction Indicator Lamp (MIL)
3. Replace Motronic Engine Control Module (ECM) -J220-. See «ENGINE CONTROL MODULE (ECM), REPLACING»(/audi/a6/c5-1997-2001/remont/fuel-system/#multiport-fuel-injection-mfi-generic-scan-tool-28l-v6-aha-atq__engine-control-module-ecm-replacing) .

Identifying VAS 5052 Vehicle Diagnostic And Information System. Scheme 175

1. VAS 5052 Vehicle Diagnostic and Information System with
2. VAS 5052/3 diagnostic cable

Function

Via the diagnostic tester, different diagnostic modes can be selected under "address word 33 - On-Board Diagnostic (OBD)".

The following diagnostic modes monitor all components and systems which influence the emission quality.

1. Coolant temperature must be at least 80 °C PID 5, Coolant temperature.

1. Connect diagnostic tester. See «DIAGNOSTIC TESTER, CONNECTING»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) .
2. Depending on the desired operating condition: switch on ignition or Start engine and let run at idle.
3. Under address word 33, select "Diagnostic mode 1: Checking measuring values."
4. Select the desired measuring values "PID XX".

Note. The specified values for the respective measuring values can be found at the respective component - and function tests. The following list only serves as an overview. The measuring values are sorted according to the PID (parameter -identifications).

DISPLAY MEASURING VALUES (PID)

Note. Bank 1 = Cylinder bank 1, in direction of travel, right Bank 2 = Cylinder bank 2, in direction of travel, left

1. End diagnosis and switch ignition off.

This diagnostic mode displays the operating requirements at which an emission relevant malfunction was detected and stored by the Engine Control Module (ECM).

1. Connect diagnostic tester. See «DIAGNOSTIC TESTER, CONNECTING»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) .
2. Depending on the desired operating condition: switch on ignition or Start engine and let run at idle.
3. Under address word 33, select "Diagnostic mode 2: Check operating conditions."
4. Select the desired operating condition "PID XX".

Note. The operating conditions are sorted by the PID (parameter - identifications).

DISPLAY OPERATING CONDITIONS (PID)

Note. Bank 1 = Cylinder bank 1, in direction of travel, right Bank 2 = Cylinder bank 2, in direction of travel, left

If DTCs are displayed in "PID 02"

1. Repair stored malfunctions according to DTC table: SAE P0xxx-DTCs. See «DIAGNOSTIC TROUBLE CODE (DTC) TABLES»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) , SAE P1xxx-DTCs. See «SAE P1XXX-DTCS»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq__sae-p1xxx-dtcs) , SAE P2xxx-DTCs. See «SAE P2XXX-DTCS»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq__sae-p2xxx-dtcs) , SAE P3xxx-DTCs. See «SAE P3xxx-DTCs»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq__sae-p3xxx-dtcs) .
2. End diagnosis and switch ignition off.

This diagnostic mode indicates all stored DTCs of components and systems which are emission relevant.

Malfunction Indicator Lamp (MIL) in instrument cluster lights up for one DTC entry.

SAE Diagnostic Trouble Codes (DTCs)

The DTC always consists of a 5 -digit alpha -numeric value with the following meaning

Component group

1. Pxxxx = DTC for drivetrain.

Norm-Code

1. P0xxx = trouble codes defined by SAE with specified malfunction texts.
2. P1xxx = additional emission relevant DTCs provided by manufacturer.
3. P2xxx = DTCs defined by SAE with specified texts, from MY 2000
4. P3xxx = additional emissions relevant DTCs provided by manufacturer from MY 2000.

Repair group

1. Px0xx = Fuel -air mixture and additional emission regulations
2. Px1xx = Fuel and air ratio.
3. Px2xx = Fuel and air ratio.
4. Px3xx = Ignition system.
5. Px4xx = additional emission regulation.
6. Px5xx = Speed and idle control.
7. Px6xx = Control module and output signals.
8. Px7xx = Transmission.
9. Px8xx = Transmission.
10. Px9xx = Control modules, input and output signals.

1. Connect diagnostic tester. See «DIAGNOSTIC TESTER, CONNECTING»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) .
2. Start engine and let run at idle.

Note. Only if engine does not start: Operate starter for approx. 6 seconds. Do not switch ignition off afterward .

1. Under address word 33, select "Diagnostic mode 3:, Check DTC memory." The number of stored malfunctions or "0 malfunctions detected" is displayed.
2. End diagnosis and switch ignition off.
3. Repair stored malfunctions according to DTC table: SAE P0xxx-DTCs. See «DIAGNOSTIC TROUBLE CODE (DTC) TABLES»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) , SAE P1xxx-DTCs. See «SAE P1XXX-DTCS»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq__sae-p1xxx-dtcs) , SAE P2xxx-DTCs. See «SAE P2XXX-DTCS»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq__sae-p2xxx-dtcs) , SAE P3xxx-DTCs. See «SAE P3XXX-DTCS»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq__sae-p3xxx-dtcs) .

Note. The DTC table is sorted by SAE code. "E-Gas" -relevant malfunctions are also indicated by the warning lamp for Electronic Power Control ("EPC warning lamp") in the instrument cluster. In addition, "emission" -relevant malfunctions are indicated in the instrument cluster via the Malfunction Indicator Lamp (MIL). In diagnostic mode 2, it can be determined at which operating condition a malfunction was detected and stored by the Engine Control Module (ECM).See DIAGNOSTIC MODE 2: CHECKING OPERATING CONDITIONS . Erase DTC memory after repairing malfunction. See DIAGNOSTIC MODE 4: RESET/ERASE DIAGNOSTIC DATA .

Display example

P0444 Evaporative Emission System Purge Control Valve Circuit Open

Explanation

1. P0444 = SAE diagnostic trouble code (malfunction identification number).
2. Evaporative Emission System Purge Control Valve = malfunctioning wiring path or malfunctioning component.
3. Circuit Open = Malfunction type as text

This diagnostic mode performs the following functions

1. all emission relevant malfunctions in DTC memory will be erased
2. the operating conditions at which a malfunction was stored will be reset «DIAGNOSTIC MODE 2: CHECKING OPERATING CONDITIONS»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq)
3. all adaptation values are being reset
4. all test results of the diagnostic functions are being reset .

1. DTC memory was erased. See «DIAGNOSTIC MODE 3: CHECK DTC MEMORY»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) .

1. Connect diagnostic tester. See «DIAGNOSTIC TESTER, CONNECTING»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) .
2. Start engine and let run at idle .
3. Under address word 33, select "Diagnostic mode 4: Reset/erase diagnostic data .

will be erased

1. Number and content of the DTC memories
2. Operating conditions
3. Test results.

1. End diagnosis and switch ignition off.

The static values of the oxygen sensors are indicated via this diagnostic mode.

The values of the individual oxygen sensor signal outputs must reach the specified value or must be within the min. - and max.- limits.

Requirements

1. There must not be any DTCs stored in DTC memory. See «DIAGNOSTIC MODE 3: CHECK DTC MEMORY»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) .
2. Coolant temperature must be at least 80°C. See «DIAGNOSTIC MODE 1: CHECK MEASURING VALUES»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) , PID 5, Coolant temperature.

1. Connect diagnostic tester. See «DIAGNOSTIC TESTER, CONNECTING»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) .
2. Start engine and let run at idle.
3. Under address word 33, select "Diagnostic mode 5: Check output of oxygen sensor signals".
4. Select the desired output of oxygen sensor signals "Test - ID XX".

Output Of Oxygen Sensor Signals Graph. Scheme 176

1. Select desired output of oxygen sensor signals "Test -ID XX".

*) V = Voltage in Volts (oxygen sensor signal)

**) t = Time in seconds

OXYGEN SENSOR SIGNAL REFERENCE

Note. Bank 1 = Cylinder bank 1, in direction of travel, right Bank 2 = Cylinder bank 2, in direction of travel, left When selecting the diagnostic mode, the entry is always performed in "Bank 1 sensor 1". If either the VAG1551/1552 Scan Tool (ST) or VAS5051/5052 Vehicle Diagnostic Testing and Information System is used for checking the output of oxygen sensor signals, the respective oxygen sensor can be selected by pressing button 1, 2, 5 and 6: - Button 1 = Bank 1 sensor 1, - Button 2 = Bank 1 sensor 2, - Button 5 = Bank 2 sensor 1, - Button 6 = Bank 2 sensor 2.

1. End diagnosis and switch ignition off.

Evaluation test-ID 01: Rich to lean sensor barrier voltage

Evaluation test-ID 01: Rich to lean sensor barrier voltage chart

If specified value is not obtained

1. Replace the respective oxygen sensor: Heated Oxygen Sensor (HO2S) -G39-, bank 2. See «EXHAUST MANIFOLD, FRONT EXHAUST PIPE WITH THREE WAY CATALYTIC CONVERTER (TWC) AND ATTACHMENTS»(/audi/a6/c5-1997-2001/remont/exhaust/#exhaust-system-emission-control-generic-scan-tool-28l-v6-aha-atq__exhaust-manifold-front-exhaust-pipe-with) , item 1. Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) -G130-, bank 2. See «MUFFLERS WITH MOUNTS»(/audi/a6/c5-1997-2001/remont/exhaust/#exhaust-system-emission-control-generic-scan-tool-28l-v6-aha-atq) , item 4. Heated Oxygen Sensor (HO2S) 2 -G108-, bank 2. See «MUFFLERS WITH MOUNTS»(/audi/a6/c5-1997-2001/remont/exhaust/#exhaust-system-emission-control-generic-scan-tool-28l-v6-aha-atq) , item 15 Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) -G131-, bank 2. See «MUFFLERS WITH MOUNTS»(/audi/a6/c5-1997-2001/remont/exhaust/#exhaust-system-emission-control-generic-scan-tool-28l-v6-aha-atq) , item 11.
2. Erase DTC memory of Engine Control Module (ECM). See «DIAGNOSTIC MODE 4: RESET/ERASE DIAGNOSTIC DATA»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) .
3. Generate readiness code. See «READINESS CODE, GENERATING»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) .

Evaluation test-ID 02: Lean to rich sensor barrier voltage

EVALUATION TEST-ID 02: LEAN TO RICH SENSOR BARRIER VOLTAGE CHART

If specified value is not obtained

1. Replace the respective oxygen sensor: Heated Oxygen Sensor (HO2S) -G39-, bank 2. See «EXHAUST MANIFOLD, FRONT EXHAUST PIPE WITH THREE WAY CATALYTIC CONVERTER (TWC) AND ATTACHMENTS»(/audi/a6/c5-1997-2001/remont/exhaust/#exhaust-system-emission-control-generic-scan-tool-28l-v6-aha-atq__exhaust-manifold-front-exhaust-pipe-with) , item 1. Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) -G130-, bank 2. See «MUFFLERS WITH MOUNTS»(/audi/a6/c5-1997-2001/remont/exhaust/#exhaust-system-emission-control-generic-scan-tool-28l-v6-aha-atq) , item 4. Heated Oxygen Sensor (HO2S) 2 -G108-, bank 2. See «MUFFLERS WITH MOUNTS»(/audi/a6/c5-1997-2001/remont/exhaust/#exhaust-system-emission-control-generic-scan-tool-28l-v6-aha-atq) , item 15. Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) -G131-, bank 2. See «MUFFLERS WITH MOUNTS»(/audi/a6/c5-1997-2001/remont/exhaust/#exhaust-system-emission-control-generic-scan-tool-28l-v6-aha-atq) , item 11.
2. Erase DTC memory of Engine Control Module (ECM). See «DIAGNOSTIC MODE 4: RESET/ERASE DIAGNOSTIC DATA»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) .
3. Generate readiness code. See «READINESS CODE, GENERATING»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) .

Evaluation test-ID 07: Minimum voltage at sensor for test cycle

EVALUATION TEST-ID 07: MINIMUM VOLTAGE AT SENSOR FOR TEST CYCLE CHART

If the specified value is not reached

1. Short circuit to Ground (GND) in oxygen sensor or in wire

1. Check oxygen sensor and oxygen sensor control: Bank 1 sensor 1 and Bank 2 sensor 1. See «OXYGEN SENSOR (O2S) AND OXYGEN SENSOR CONTROL BEFORE THREE WAY CATALYTIC CONVERTER (TWC), CHECKING»(/audi/a6/c5-1997-2001/remont/fuel-system/#multiport-fuel-injection-mfi-generic-scan-tool-28l-v6-aha-atq__oxygen-sensor-o2s-and-oxygen-sensor) . Bank 1 sensor 2 and Bank 2 sensor 2. See «OXYGEN SENSOR AND OXYGEN SENSOR CONTROL BEHIND THREE WAY CATALYTIC CONVERTER (TWC), CHECKING»(/audi/a6/c5-1997-2001/remont/fuel-system/#multiport-fuel-injection-mfi-generic-scan-tool-28l-v6-aha-atq__oxygen-sensor-and-oxygen-sensor-control) .

If the specified value is exceeded

1. Oxygen sensor not ready for operation
2. Oxygen sensor heater faulty

1. Check oxygen sensor heater: Bank 1 sensor 1 and Bank 2 sensor 1. See «OXYGEN SENSOR HEATER FOR OXYGEN SENSORS BEFORE THREE WAY CATALYTIC CONVERTER (TWC), CHECKING»(/audi/a6/c5-1997-2001/remont/fuel-system/#multiport-fuel-injection-mfi-generic-scan-tool-28l-v6-aha-atq__oxygen-sensor-heater-for-oxygen-sensors) . Bank 1 sensor 2 and Bank 2 sensor 2. See «OXYGEN SENSOR HEATER FOR OXYGEN SENSORS BEHIND THREE WAY CATALYTIC CONVERTER (TWC), CHECKING»(/audi/a6/c5-1997-2001/remont/fuel-system/#multiport-fuel-injection-mfi-generic-scan-tool-28l-v6-aha-atq__oxygen-sensor-heater-for-oxygen-sensors) .

1. Short circuit to B+ or open circuit in wiring in oxygen sensor or in wire

1. Check oxygen sensor and oxygen sensor control: Bank 1 sensor 1 and Bank 2 sensor 1. See «OXYGEN SENSOR (O2S) AND OXYGEN SENSOR CONTROL BEFORE THREE WAY CATALYTIC CONVERTER (TWC), CHECKING»(/audi/a6/c5-1997-2001/remont/fuel-system/#multiport-fuel-injection-mfi-generic-scan-tool-28l-v6-aha-atq__oxygen-sensor-o2s-and-oxygen-sensor) . Bank 1 sensor 2 and Bank 2 sensor 2. See «OXYGEN SENSOR HEATER FOR OXYGEN SENSORS BEHIND THREE WAY CATALYTIC CONVERTER (TWC), CHECKING»(/audi/a6/c5-1997-2001/remont/fuel-system/#multiport-fuel-injection-mfi-generic-scan-tool-28l-v6-aha-atq__oxygen-sensor-heater-for-oxygen-sensors) .

Evaluation test-ID 08: Maximum voltage at sensor for test cycle

EVALUATION TEST-ID 08: MAXIMUM VOLTAGE AT SENSOR FOR TEST CYCLE CHART

If the specified value is not reached

1. Oxygen sensor not ready for operation
2. Oxygen sensor heater faulty

1. Check oxygen sensor heater: Bank 1 sensor 1 and Bank 2 sensor 1. See «OXYGEN SENSOR HEATER FOR OXYGEN SENSORS BEFORE THREE WAY CATALYTIC CONVERTER (TWC), CHECKING»(/audi/a6/c5-1997-2001/remont/fuel-system/#multiport-fuel-injection-mfi-generic-scan-tool-28l-v6-aha-atq__oxygen-sensor-heater-for-oxygen-sensors) . Bank 1 sensor 2 and Bank 2 sensor 2. See «OXYGEN SENSOR HEATER FOR OXYGEN SENSORS BEHIND THREE WAY CATALYTIC CONVERTER (TWC), CHECKING»(/audi/a6/c5-1997-2001/remont/fuel-system/#multiport-fuel-injection-mfi-generic-scan-tool-28l-v6-aha-atq__oxygen-sensor-heater-for-oxygen-sensors) .

1. Short circuit to Ground (GND) or open circuit in wiring in oxygen sensor or in wire

1. Check oxygen sensor and oxygen sensor control

1. Bank 1 sensor 1 and Bank 2 sensor 1. See «OXYGEN SENSOR (O2S) AND OXYGEN SENSOR CONTROL BEFORE THREE WAY CATALYTIC CONVERTER (TWC), CHECKING»(/audi/a6/c5-1997-2001/remont/fuel-system/#multiport-fuel-injection-mfi-generic-scan-tool-28l-v6-aha-atq__oxygen-sensor-o2s-and-oxygen-sensor) .
2. Bank 1 sensor 2 and Bank 2 sensor 2. See «OXYGEN SENSOR HEATER FOR OXYGEN SENSORS BEHIND THREE WAY CATALYTIC CONVERTER (TWC), CHECKING»(/audi/a6/c5-1997-2001/remont/fuel-system/#multiport-fuel-injection-mfi-generic-scan-tool-28l-v6-aha-atq__oxygen-sensor-heater-for-oxygen-sensors) .

If the specified value is exceeded

1. Short circuit to B+ in oxygen sensor or in wire

1. Check oxygen sensor and oxygen sensor control: Bank 1 sensor 1 and Bank 2 sensor 1. See «OXYGEN SENSOR (O2S) AND OXYGEN SENSOR CONTROL BEFORE THREE WAY CATALYTIC CONVERTER (TWC), CHECKING»(/audi/a6/c5-1997-2001/remont/fuel-system/#multiport-fuel-injection-mfi-generic-scan-tool-28l-v6-aha-atq__oxygen-sensor-o2s-and-oxygen-sensor) . Bank 1 sensor 2 and Bank 2 sensor 2. See «OXYGEN SENSOR HEATER FOR OXYGEN SENSORS BEHIND THREE WAY CATALYTIC CONVERTER (TWC), CHECKING»(/audi/a6/c5-1997-2001/remont/fuel-system/#multiport-fuel-injection-mfi-generic-scan-tool-28l-v6-aha-atq__oxygen-sensor-heater-for-oxygen-sensors) .

Evaluation test-ID 09: Time period between sensor shift procedures

EVALUATION TEST-ID 09: TIME PERIOD BETWEEN SENSOR SHIFT PROCEDURES CHART

If the specified value is not reached

1. Short circuit in oxygen sensor or in wire

1. Check oxygen sensor and oxygen sensor control: Bank 1 sensor 1 and Bank 2 sensor 1. See «OXYGEN SENSOR (O2S) AND OXYGEN SENSOR CONTROL BEFORE THREE WAY CATALYTIC CONVERTER (TWC), CHECKING»(/audi/a6/c5-1997-2001/remont/fuel-system/#multiport-fuel-injection-mfi-generic-scan-tool-28l-v6-aha-atq__oxygen-sensor-o2s-and-oxygen-sensor) .

If the specified value is exceeded

1. Oxygen sensor faulty

1. Check oxygen sensor and oxygen sensor control. See «OXYGEN SENSOR (O2S) AND OXYGEN SENSOR CONTROL BEFORE THREE WAY CATALYTIC CONVERTER (TWC), CHECKING»(/audi/a6/c5-1997-2001/remont/fuel-system/#multiport-fuel-injection-mfi-generic-scan-tool-28l-v6-aha-atq__oxygen-sensor-o2s-and-oxygen-sensor) .

This diagnostic mode displays the test results of emission relevant components and systems which are not continuously monitored.

The values of the individual test results must reach the specified value or must be within the min.- and max. - limits.

DIAGNOSTIC MODE DISPLAYS CHART

Test requirements

1. There must not be any DTCs stored in DTC memory. See «DIAGNOSTIC MODE 3: CHECK DTC MEMORY»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) .
2. Coolant temperature must be at least 80°C. See «DIAGNOSTIC MODE 1: CHECK MEASURING VALUES»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) ; PID 5, Coolant temperature.

1. Connect diagnostic tester. See «DIAGNOSTIC TESTER, CONNECTING»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) .
2. Perform a 15 minute road test in the highest gear or in the highest driving mode on a level driving surface.

The following operating conditions must be met during this road test

1. Engine speed approx. 1800 to 2200 RPM. See «DIAGNOSTIC MODE 1: CHECK MEASURING VALUES»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) ; PID 12, engine rotations per minute (RPM)
2. Vehicle speed constant 90 km/h. See «DIAGNOSTIC MODE 1: CHECK MEASURING VALUES»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) ; PID 13, Vehicle speed

Observe the safety precautions that apply to road tests. See SAFETY PRECAUTIONS .

1. Let engine run at idle.
2. Under address word 33, select "Diagnostic mode 6: Check test results of components that are not continuously monitored".
3. Select the "Test -ID 01: Catalytic converter".
4. Check specified values at idle.

TEST -ID 01: CATALYTIC CONVERTER

Note. Bank 1 = Cylinder bank 1, in direction of travel, right Bank 2 = Cylinder bank 2, in direction of travel, left

1. End diagnosis and switch ignition off.

If the specified values are exceeded

1. Replace the respective exhaust pipe with catalytic converter

1. Right front exhaust pipe with catalytic converter. See «EXHAUST SYSTEM COMPONENTS, REMOVING AND INSTALLING»(/audi/a6/c5-1997-2001/remont/exhaust/#exhaust-system-emission-controls-28l-v6-aha-atq__exhaust-system-components-removing-and-installing) .
2. Left front exhaust pipe with catalytic converter. See «EXHAUST SYSTEM COMPONENTS, REMOVING AND INSTALLING»(/audi/a6/c5-1997-2001/remont/exhaust/#exhaust-system-emission-controls-28l-v6-aha-atq__exhaust-system-components-removing-and-installing) .

1. There must not be any DTCs stored in DTC memory. See «DIAGNOSTIC MODE 3: CHECK DTC MEMORY»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) .

Let vehicle cool off with the ignition switched off until the following conditions are met

1. Intake air temperature 10 to 50°C. See «DIAGNOSTIC MODE 1: CHECK MEASURING VALUES»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) ; PID 15: Intake Air Temperature (IAT).
2. Coolant temperature approx. intake air temperature (10 to 50°C). See «DIAGNOSTIC MODE 1: CHECK MEASURING VALUES»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) ; PID 5, Coolant temperature.

1. Connect diagnostic tester. See «DIAGNOSTIC TESTER, CONNECTING»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) .
2. Start engine and let run at idle for at least 15 minutes.
3. Under address word 33, select "Diagnostic mode 6: Check test results of components that are not continuously monitored".
4. Select the "Test -ID 03: Secondary Air Injection (AIR) system"
5. Check specified values at idle.

TEST -ID 03: SECONDARY AIR INJECTION (AIR) SYSTEM

Note. Bank 1 = Cylinder bank 1, in direction of travel, right Bank 2 = Cylinder bank 2, in direction of travel, left

1. End diagnosis and switch ignition off.

If the specified values are not reached

1. Check secondary air system for proper seal. See «SECONDARY AIR SYSTEM, CHECKING FOR PROPER SEAL»(/audi/a6/c5-1997-2001/remont/exhaust/#exhaust-system-emission-control-generic-scan-tool-28l-v6-aha-atq) .
2. Check Secondary Air Injection (AIR) Pump Motor -V101-. See «SECONDARY AIR INJECTION (AIR) PUMP MOTOR, CHECKING»(/audi/a6/c5-1997-2001/remont/exhaust/#exhaust-system-emission-control-generic-scan-tool-28l-v6-aha-atq) .

1. There must not be any DTCs stored in DTC memory. See «DIAGNOSTIC MODE 3: CHECK DTC MEMORY»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) .
2. Coolant temperature must be 80 to 110°C. See «DIAGNOSTIC MODE 1: CHECK MEASURING VALUES»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) ; PID 5, Coolant temperature.
3. Throttle valve angle 12.0 to 16.0 %. See «DIAGNOSTIC MODE 1: CHECK MEASURING VALUES»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) ; PID 17: Throttle valve position (absolute).

1. Connect diagnostic tester. See «DIAGNOSTIC TESTER, CONNECTING»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) .
2. Start engine and let run at idle for at least 15 minutes.
3. Under address word 33, select "Diagnostic mode 6: Check test results of components that are not continuously monitored".
4. Select the "Test -ID 05: Tank ventilation system". TEST -ID 05: TANK VENTILATION SYSTEM Test-ID 05: Tank ventilation system Specified value: min. max. Deviation of oxygen sensor control in direction "lean" --- 0.050 Deviation of oxygen sensor control in direction "rich" --- 0.050
5. End diagnosis and switch ignition off.

If the specified values are exceeded

1. EVAP canister system, checking for proper seal. See «EVAP CANISTER SYSTEM, CHECKING FOR PROPER SEAL»(/audi/a6/c5-1997-2001/remont/fuel-system/#fuel-supply-generic-scan-tool-28l-v6-aha-atq) .
2. Leak detection pump (LDP) -V144-. For checking, see «LEAK DETECTION PUMP (LDP), CHECKING»(/audi/a6/c5-1997-2001/remont/fuel-system/#fuel-supply-generic-scan-tool-28l-v6-aha-atq) .

Test requirement

1. There must not be any DTCs stored in DTC memory. See «DIAGNOSTIC MODE 3: CHECK DTC MEMORY»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) .

1. Connect diagnostic tester. See «DIAGNOSTIC TESTER, CONNECTING»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) .
2. Perform a road test until a coolant temperature of 80 to 100 °C has been reached. See «DIAGNOSTIC MODE 1: CHECK MEASURING VALUES»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) ; PID 5, Coolant temperature.

Observe the safety precautions that apply to road tests. See SAFETY PRECAUTIONS .

1. Switch ignition off.
2. Start engine at a coolant temperature of 80 to 90 °C and let it run at idle.
3. Perform a 5 minute road test in the highest gear or in the highest driving mode on a level driving surface. The following operating conditions must be met during this road test: Engine speed approx. 1800 to 2200 RPM. See «DIAGNOSTIC MODE 1: CHECK MEASURING VALUES»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) ; PID 12, engine rotations per minute (RPM) Vehicle speed constant 90 km/h. See «DIAGNOSTIC MODE 1: CHECK MEASURING VALUES»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) ; PID 13, Vehicle speed

Observe the safety precautions that apply to road tests. See SAFETY PRECAUTIONS .

1. Let engine run at idle.
2. Under address word 33, select "Diagnostic mode 6: Check test results of components that are not continuously monitored".
3. Select the "Test -ID 09: Engine Coolant Temperature (ECT) sensor".
4. Check specified values at idle. TEST -ID 09: ENGINE COOLANT TEMPERATURE (ECT) SENSOR Test-ID 09: Engine Coolant Temperature (ECT) Sensor -G62- Specified value: min. max. Coolant temperature 70 °C 115 °C
5. End diagnosis and switch ignition off.

If specified value is not obtained

1. Check Engine Coolant Temperature (ECT) Sensor -G62-. See «ENGINE COOLANT TEMPERATURE (ECT) SENSOR, CHECKING»(/audi/a6/c5-1997-2001/remont/fuel-system/#multiport-fuel-injection-mfi-generic-scan-tool-28l-v6-aha-atq) .
2. Check coolant regulator (thermostat): See «THERMOSTAT»(ref-149958-S12472190302003031400000)

This diagnostic mode indicates all stored DTCs of components and systems which are continuously monitored.

Note. In "Diagnostic mode 3: Check DTC memory", no DTC entry is indicated.

1. Connect diagnostic tester. See «DIAGNOSTIC TESTER, CONNECTING»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) .
2. Start engine and let run at idle.

Note. Only if engine does not start: Operate starter for approx. 6 seconds. Do not switch ignition off afterward.

1. Under address word 33, select "Diagnostic mode 7: Check test results of components that are continuously monitored". The number of stored malfunctions or "0 malfunctions detected" is displayed.
2. End diagnosis and switch ignition off.
3. Repair stored malfunctions according to DTC table: SAE P0xxx-DTCs. See «DIAGNOSTIC TROUBLE CODE (DTC) TABLES»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) , SAE P1xxx-DTCs. See «SAE P1XXX-DTCS»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq__sae-p1xxx-dtcs) , SAE P2xxx-DTCs. See «SAE P2XXX-DTCS»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq__sae-p2xxx-dtcs) , SAE P3xxx-DTCs. See «SAE P3XXX-DTCS»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq__sae-p3xxx-dtcs) .

Note. The DTC table is sorted by SAE code. "E-Gas" -relevant malfunctions are also indicated by the warning lamp for Electronic Power Control ("EPC warning lamp") in the instrument cluster. Erase DTC memory after repairing malfunction. See DIAGNOSTIC MODE 4: RESET/ERASE DIAGNOSTIC DATA .

This diagnostic mode checks the fuel system for leaks.

Note. The Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80- and Leak detection pump (LDP) - V144- seal the tank system. Pressure of (max. 70 mbar) can be applied to the fuel system via the test connection (in engine compartment, right) and via engine leak detection spray (e.g.: G 001 800 A1) leaks can be detected.

1. There must not be any DTCs stored in DTC memory. See «DIAGNOSTIC MODE 3: CHECK DTC MEMORY»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) .
2. Coolant temperature must be 80 to 110°C. See «DIAGNOSTIC MODE 1: CHECK MEASURING VALUES»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) ; PID 5, Coolant temperature.
3. Intake air temperature must not be above the maximum of 60°C. See «DIAGNOSTIC MODE 1: CHECK MEASURING VALUES»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) ; PID 15, Intake air temperature.
4. Throttle valve angle 12.0 to 16.0 %. See «DIAGNOSTIC MODE 1: CHECK MEASURING VALUES»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) ; PID 17: Throttle valve position (absolute).

Function test

1. Connect diagnostic tester. See «DIAGNOSTIC TESTER, CONNECTING»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) .
2. Start engine and let run at idle for at least 15 minutes.
3. Under address word 33, select "Diagnostic mode 8: Tank leak test".
4. Select measuring value "Test-ID 01: Tank leak test".
5. Check specified value of tank leak test at idle.

TEST-ID 01: TANK LEAK TEST

Note. The function test can take a few minutes. If the accelerator pedal is depressed during the test, the test will be aborted. To repeat the tank leak test, switch ignition off and start engine again and let run at idle for at least 15 minutes.

If specified value is obtained

1. End diagnosis and switch ignition off.

If specified value is not obtained

1. EVAP canister system, checking for proper seal. See «EVAP CANISTER SYSTEM, CHECKING FOR PROPER SEAL»(/audi/a6/c5-1997-2001/remont/fuel-system/#fuel-supply-generic-scan-tool-28l-v6-aha-atq) .
2. Leak detection pump (LDP) -V144-. For checking, see «LEAK DETECTION PUMP (LDP), CHECKING»(/audi/a6/c5-1997-2001/remont/fuel-system/#fuel-supply-generic-scan-tool-28l-v6-aha-atq) .

In this diagnostic mode, vehicle specific diagnostic data such as e.g. the control module versions will be displayed.

1. There must not be any DTCs stored in DTC memory. See «DIAGNOSTIC MODE 3: CHECK DTC MEMORY»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) .

1. Connect diagnostic tester. See «DIAGNOSTIC TESTER, CONNECTING»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) .
2. Switch ignition on.
3. Under address word 33, select "Diagnostic mode 9: vehicle information".
4. Select desired vehicle information "Test-ID XX".

Display vehicle information

DISPLAY VEHICLE INFORMATION CHART

1. End diagnosis and switch ignition off.

The readiness code is an 8 digit number block that indicates the results of an emission relevant On Board Diagnostic (OBD).

When the diagnostic for a system (e.g.: secondary air system) has run through successfully, the respective digit of the number block is set from 1 to 0.

On Board Diagnostics are performed at regular intervals during normal vehicle operation. After repairing an exhaust relevant system, the readiness code should be generated via a road test to ensure that these systems are working according to specifications. If a malfunction is recognized during the diagnostic check, it is stored in DTC memory.

The readiness code is erased every time DTC memory is erased or when voltage supply is interrupted. DTC memory should therefore only be erased when there are DTCs stored.

1. There must not be any DTCs stored in DTC memory. See «DIAGNOSTIC MODE 3: CHECK DTC MEMORY»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) .
2. Coolant temperature must be at least 80°C. See «DIAGNOSTIC MODE 1: CHECK MEASURING VALUES»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) ; PID 5, Coolant temperature.

1. Connect diagnostic tester. See «DIAGNOSTIC TESTER, CONNECTING»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) .
2. Start engine and let run at idle.
3. Under address word 33, select "Diagnostic mode 1: Checking measuring values."
4. select desired measuring value "PID 01".
5. Observe the right 8 -digit number block

If all diagnoses have run through successfully, the 8 -digit number block

Specified value: 00000000

must be displayed.

Evaluation PID 01: System status -information (right 8-digit number block:)

EVALUATION PID 01: SYSTEM STATUS -INFORMATION

If a1 is displayed instead of a 0 in the 8-digit number block

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

1. The respective fuses of the Motronic fuel injection and ignition system must be OK

Identifying Fuse Box. Scheme 177

1. Battery voltage must be at least 11.5 volts.
2. All electrical consumers like, for example, lights and rear window heating must be switched off.
3. If vehicle is equipped with an A/C system, it must be switched off.
4. Ground (GND) connections between engine and chassis must be OK.
5. There must not be any DTCs stored in DTC memory. See «DIAGNOSTIC MODE 3: CHECK DTC MEMORY»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) .
6. Throttle valve angle 12.0 to 16.0 %. See «DIAGNOSTIC MODE 1: CHECK MEASURING VALUES»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) ; PID 17: Throttle valve position (absolute).

Let vehicle cool off with the ignition switched off until the following conditions are met

1. Intake air temperature 10 to 50°C. See «DIAGNOSTIC MODE 1: CHECK MEASURING VALUES»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) ; PID 15: Intake Air Temperature (IAT)
2. Coolant temperature approx. intake air temperature (10 to 50°C). See «DIAGNOSTIC MODE 1: CHECK MEASURING VALUES»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) ; PID 5, Coolant temperature.

1. Connect diagnostic tester. See «DIAGNOSTIC TESTER, CONNECTING»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) .
2. Start engine and let run at idle for at least 15 minutes.
3. Perform a 15 minute road test in the highest gear or in the highest driving mode on a level driving surface. The following operating conditions must be met during this road test: Engine speed approx. 1800 to 2200 RPM. See «DIAGNOSTIC MODE 1: CHECK MEASURING VALUES»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) ; PID 12, engine rotations per minute (RPM). Vehicle speed constant 90 km/h. See «DIAGNOSTIC MODE 1: CHECK MEASURING VALUES»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-28l-v6-aha-atq) ; PID 13, Vehicle speed.

Observe the safety precautions that apply to road tests. See SAFETY PRECAUTIONS .

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

SAE P0xxx-DTCs

Fuel and air mixture and additional emission regulations

DIAGNOSTIC TROUBLE CODES (P0010 TO P0015)

DIAGNOSTIC TROUBLE CODES (P0020 TO P0025)

DIAGNOSTIC TROUBLE CODES (P0030 TO P0041)

DIAGNOSTIC TROUBLE CODES (P0050 TO P0058)

Fuel and air ratios

DIAGNOSTIC TROUBLE CODES (P0101 TO P0103)

DIAGNOSTIC TROUBLE CODES (P0112 TO P0123)

DIAGNOSTIC TROUBLE CODES (P0130 TO P0135)

DIAGNOSTIC TROUBLE CODES (P0137 TO P0141)

DIAGNOSTIC TROUBLE CODES (P0150 TO P0155)

DIAGNOSTIC TROUBLE CODES (P0156 TO P0161)

DIAGNOSTIC TROUBLE CODES (P0171)

DIAGNOSTIC TROUBLE CODES (P0172)

DIAGNOSTIC TROUBLE CODES (P0174)

DIAGNOSTIC TROUBLE CODES (P0175)

Fuel and air ratios

DIAGNOSTIC TROUBLE CODES (P0201 TO P0223)

DIAGNOSTIC TROUBLE CODES (P0230)

DIAGNOSTIC TROUBLE CODES (P0261 TO P0277)

Ignition system

DIAGNOSTIC TROUBLE CODES (P0300 TO P03)

DIAGNOSTIC TROUBLE CODES (P0340 TO P0348)

DIAGNOSTIC TROUBLE CODES (P0351 TO P0356)

Additional exhaust regulation

DIAGNOSTIC TROUBLE CODES (P0412 TO P0431)

DIAGNOSTIC TROUBLE CODES (P0441 TO P0492)

Speed and idle control

DIAGNOSTIC TROUBLE CODES (P0501 TO P0507)

Control module and output signals

DIAGNOSTIC TROUBLE CODES (P0600 TO P0)

DIAGNOSTIC TROUBLE CODES (P0638 TO P0688)

Transmission

DIAGNOSTIC TROUBLE CODES (P0704)

SAE P1xxx-DTCs

Fuel and air ratios

DIAGNOSTIC TROUBLE CODES (P1127)

DIAGNOSTIC TROUBLE CODES (P1128)

DIAGNOSTIC TROUBLE CODES (P1129)

DIAGNOSTIC TROUBLE CODES (P1130)

DIAGNOSTIC TROUBLE CODES (P1136)

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

DIAGNOSTIC TROUBLE CODES (P1137)

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

DIAGNOSTIC TROUBLE CODES (P1138)

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

DIAGNOSTIC TROUBLE CODES (P1139 TO P1177)

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

Fuel and air ratios

DIAGNOSTIC TROUBLE CODES (P1296)

SAE P2xxx-DTCs

Fuel and air mixture and additional emission regulations

DIAGNOSTIC TROUBLE CODES (P2096 TO P2099)

Fuel and air ratios

DIAGNOSTIC TROUBLE CODES (P2101 TO P2181)

Additional exhaust regulation

DIAGNOSTIC TROUBLE CODES (P2400 TO P2404)

SAE P3xxx-DTCs

Fuel and air ratios

DIAGNOSTIC TROUBLE CODES (P3081 & P3262)

See also:
• INSTRUMENTS - UP TO 2000
• ENGINE CONTROL MODULE (ECM), REPLACING
• EXHAUST MANIFOLD, FRONT EXHAUST PIPE WITH THREE WAY CATALYTIC CONVERTER (TWC) AND ATTACHMENTS
• MUFFLERS WITH MOUNTS
• OXYGEN SENSOR (O2S) AND OXYGEN SENSOR CONTROL BEFORE THREE WAY CATALYTIC CONVERTER (TWC), CHECKING
• OXYGEN SENSOR AND OXYGEN SENSOR CONTROL BEHIND THREE WAY CATALYTIC CONVERTER (TWC), CHECKING
• OXYGEN SENSOR HEATER FOR OXYGEN SENSORS BEFORE THREE WAY CATALYTIC CONVERTER (TWC), CHECKING
• SAFETY PRECAUTIONS
• EXHAUST SYSTEM COMPONENTS, REMOVING AND INSTALLING
• EVAP CANISTER SYSTEM, CHECKING FOR PROPER SEAL
• ENGINE COOLANT TEMPERATURE (ECT) SENSOR, CHECKING
• CAMSHAFT ADJUSTMENT VALVES, CHECKING
• MASS AIR FLOW (MAF) SENSOR, CHECKING
• FUEL PRESSURE REGULATOR AND RESIDUAL PRESSURE, CHECKING
• EVAPORATIVE EMISSION (EVAP) CANISTER PURGE REGULATOR VALVE, CHECKING
• TEST DATA, SPARK PLUGS
• IGNITION COIL, CHECKING
• CAMSHAFT POSITION (CMP) SENSOR, CHECKING
• SECONDARY AIR INJECTION (AIR) VALVE, CHECKING
• SECONDARY AIR INJECTION (AIR) SYSTEM
• DIAGNOSTIC TROUBLE CODE (DTC) TABLES
• SAE P1XXX-DTCS
• SAE P2XXX-DTCS
• SAE P3xxx-DTCs
• EVALUATION TEST-ID 01: RICH TO LEAN SENSOR BARRIER VOLTAGE
• EVALUATION TEST-ID 02: LEAN TO RICH SENSOR BARRIER VOLTAGE
• EVALUATION TEST-ID 07: MINIMUM VOLTAGE AT SENSOR FOR TEST CYCLE
• EVALUATION TEST-ID 08: MAXIMUM VOLTAGE AT SENSOR FOR TEST CYCLE
• EVALUATION TEST-ID 09: TIME PERIOD BETWEEN SENSOR SHIFT PROCEDURES