air condition AUDI A4 1995 B5 / 1.G AFC Engine On Board Diagnostic Multiport Fuel Injection Workshop Manual

01-3
Modes under address word 33:
Mode 1: Transfer diagnosis data Switch ignition on or let engine idle
Mode 2: Transfer operating conditions Switch ignition on or let engine idle
Mode 3: Check DTC memory Switch ignition on or let engine idle
Mode 4: Erase diagnosis information Switch ignition on or let engine idle
Mode 5: Output of HO2S signals Switch ignition on or let engine idle
Mode 6: Read test results (starting with control module 8D0 906 266 A) Switch ignition on or let engine idle
Mode 7: Read test results (starting with control module 8D0 906 266 A) Switch ignition on or let engine idle

Under address word 33, Mode 1 to Mode 5 can be selected starting from control module 8D0 906 266 and Mode 1 to
Mode 7 starting from control module 8D0 906 266 A.
Individual measuring values can be read under Mode 1. This is not recommended for Audi service department since this
information is available more easily under address word 01, function 04 and/or function 08.
Mode 2 shows the operating conditions under which a malfunction was recognized.
Mode 3 is used to check the DTC memory and Mode 4 is used to erase the DTC memory. In the Audi service department,
only address word 01, function 05 should be used to erase, since with Mode 4 the DTC memory is erased immediately
even if it was not checked first.
Static variables of HO2S probes, required by legal regulations, are displayed under Mode 5. Since these variables have
no direct relationship to HO2S diagnosis, Mode 5 is not needed by the Audi service department.
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01-5
Malfunction recognition and repair

Notes:

Before initiating the On Board Diagnostic (OBD) program, and before testing wiring and replacing components, check the
following ground connections for corrosion and damaged connections and repair them if necessary
- Check ground connections on intake manifold
- Battery ground strap OK
- Ground cable between engine and body OK Malfunction recognition and repair is described for the VAG 1551 scan tool, since it offers significantly more functions.
However, malfunction recognition and repair is also possible with a "generic" scan tool.
A specific procedure must be used to evaluate malfunctions, since the engine electronics can be checked with address
word 01 and address word 33 on OBD II vehicles. Address word 33 can only be used to check malfunctions that have
already switched on the Malfunction Indicator Light (MIL). Address word 01 can also display the malfunctions that have
not switched on the MIL. In contrast to before, the MIL is not switched on immediately with some malfunction types, but
only after two successive trips with cold starts preceding them where the malfunction occurs. If there is a customer
complaint and/or driving performance problem, the DTC memory should be checked thoroughly with address word 01,
function 02. On vehicles with MIL lit up, the DTC memory should also be checked with address word 33, mode 3. If the
DTC memory is checked with mode 3, mode 2 should also be checked which shows the operating conditions as they were
when the malfunction was recognized.
If a malfunction is present for longer than a specified time, the malfunction is stored as a static malfunction. Malfunctions
that never or immediately switch the MIL on are set as "sporadic" at each engine start. If the malfunction occurs again, the
"sporadic" status is erased again. The "sporadic" status is erased exclusively after an OK diagnosis for malfunctions that
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01-16
Diagnostic Trouble Code (DTC) overview

Notes:

The Diagnostic Trouble Code (DTC) overview is organized according to SAE and VAG trouble codes.
Diagnostic Trouble Codes (DTC) for which the MIL is not switched on by the engine control module after a malfunction is
recognized are identified with the MIL switching condition "off."
Diagnostic Trouble Codes (DTC) for which the MIL is switched on by the engine control module immediately after a
malfunction is recognized are identified with the MIL switching condition "immediately."
Diagnostic Trouble Codes (DTC) for which the MIL is not switched on until the malfunction is recognized after taking 2
trips (FTP 72) are identified with the MIL switching condition "2 Trips."
Always repair the malfunctions with the MIL switching condition "immediately" first, and then the malfunctions with the
switching condition "2 Trips."
Diagnostic Trouble Code
(DTC) Malfunction text
MIL switching
condition
SAE
VAG
P0102 16486 Mass or Volume Air Flow Circuit Low Input immediately
P0103 16487 Mass or Volume Air Flow Circuit High Input immediately
P0116 16500 Engine Coolant Temperature Circuit Range/Performance
Problem immediately
P0117 16501 Engine Coolant Temperature Circuit Low Input immediately
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01-17

Diagnostic Trouble Code (DTC)
Malfunction text
MIL switching condition
SAE
VAG
P0122 16506 Throttle Position Sensor A Circuit Low Input immediately
P0123 16507 Throttle Position Sensor A Circuit High Input immediately
P0130 16514 O2 Sensor Circuit Malfunction (Bank 1 Sensor 1) immediately
P0132 16516 O2 Sensor Circuit High Voltage (Bank 1 Sensor 1) immediately
P0133 16517 O2 Sensor Circuit Slow Response (Bank 1 Sensor 1) 2 Trips
P0134 16518 O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1) immediately
P0135 16519 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1) immediately
P0136 16520 O2 Sensor Circuit Malfunction (Bank 1 Sensor 2) immediately
P0138 16522 O2 Sensor Circuit High Voltage (Bank 1 Sensor 2) immediately
P0141 16525 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2) immediately
P0150 16534 O2 Sensor Circuit Malfunction (Bank 2 Sensor 1) immediately
P0152 16536 O2 Sensor Circuit High Voltage (Bank 2 Sensor 1) immediately
P0153 16537 O2 Sensor Circuit Slow Response (Bank 2 Sensor 1) 2 Trips
P0154 16538 O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 1) immediately
P0155 16539 O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1) immediately
P0156 16540 O2 Sensor Circuit Malfunction (Bank 2 Sensor 2) immediately
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01-18

Diagnostic Trouble Code (DTC)
Malfunction text
MIL switching condition
SAE
VAG
P0158 16542 O2 Sensor Circuit High Voltage (Bank 2 Sensor 2) immediately
P0161 16545 O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 2) immediately
P0170 16554 Fuel Trim Malfunction (Bank 1) 2 Trips
P0171 16555 System too Lean (Bank 1) 2 Trips
P0172 16556 System too Rich (Bank 1) 2 Trips
P0173 16557 Fuel Trim Malfunction (Bank 2) 2 Trips
P0174 16558 System too Lean (Bank 2) 2 Trips
P0175 16559 System too Rich (Bank 2) 2 Trips
P0300 16684 Random Misfire Detected 2 Trips / blink
P0301 16685 Cylinder 1 Misfire Detected 2 Trips / blink
P0302 16686 Cylinder 2 Misfire Detected 2 Trips / blink
P0303 16687 Cylinder 3 Misfire Detected 2 Trips / blink
P0304 16688 Cylinder 4 Misfire Detected 2 Trips / blink
P0305 16689 Cylinder 5 Misfire Detected 2 Trips / blink
P0306 16690 Cylinder 6 Misfire Detected 2 Trips / blink
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01-19

Diagnostic Trouble Code
(DTC) Malfunction text
MIL switching
condition
SAE
VAG
P0322 16706 Ignition/Distributor Engine Speed Input Circuit No Signal immediately
P0327 16711 Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor) immediately
P0332 16716 Knock Sensor 2 Circuit Low Input (Bank 2) immediately
P0337 16721 Crankshaft Position Sensor Circuit Low Input immediately
P0401 16785 Exhaust Gas Recirculation Flow Insufficient Detected 2 Trips
P0402 16786 Exhaust Gas Recirculation Flow Excessive Detected 2 Trips
P0422 16806 Main Catalyst Efficiency Below Threshold (Bank 1) 2 Trips
P0432 16816 Main Catalyst Efficiency Below Threshold (Bank 2) 2 Trips
P0440 16824 Evaporative Emission Control System Malfunction 2 Trips
P0452 16836 Evaporative Emission Control System Pressure Sensor Low
Input immediately
P0453 16837 Evaporative Emission Control System Pressure Sensor High
Input immediately
P0461 16845 Fuel Level Sensor Circuit Range/Performance immediately
P0501 16885 Vehicle Speed Sensor Range/Performance immediately
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01-20

Diagnostic Trouble Code
(DTC) Malfunction text
MIL switching
condition
SAE
VAG
P0605 65535 Internal Control Module Read Only Memory (ROM) Error (Module
Identification Defined by SAE J1979)
P0605 16989 Internal Control Module Read Only Memory (ROM) Error (Module
Identification Defined by SAE J1979) immediately
P0702 00545 Transmission Control System Electrical
P0706 17090 Transmission Range Sensor Circuit Range/Performance off
P0707 17091 Transmission Range Sensor Circuit Low Input off
P0717 17101 Input/Turbine Speed Sensor Circuit No Signal
P0722 00297 Output Speed Sensor Circuit No Signal
P0726 00543 Engine Speed Input Circuit Range/Performance
P0732 00652 Gear 2 Incorrect Ratio
P0733 00652 Gear 3 Incorrect Ratio
P0734 00652 Gear 4 Incorrect Ratio
P0735 00652 Gear 5 Incorrect Ratio
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01-21

Diagnostic Trouble Code (DTC)
Malfunction text
MIL switching condition
SAE
VAG
P0753 00258 Shift Solenoid A Electrical
P0758 00260 Shift Solenoid B Electrical
P0763 00262 Shift Solenoid C Electrical
P1101 17509 (B1-S1) Voltage too Low/Air Leak immediately
P1102 17510 Heating Circ. (B1-S1) Short to B+ immediately
P1104 17512 (B1-S2) Voltage too Low/Air Leak immediately
P1105 17513 Heating Circ. (B1-S2) Short to B+ immediately
P1106 17514 (B2-S1) Voltage too Low/Air Leak immediately
P1107 17515 Heating Circ. (B2-S1) Short to B+ immediately
P1109 17517 (B2-S2) Voltage too Low/Air Leak immediately
P1110 17518 Heating Circ. (B2-S2) Short to B+ immediately
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01-22

Diagnostic Trouble Code (DTC)
Malfunction text
MIL switching condition
SAE
VAG
P1201 17609 Cyl.1-Fuel Injector Circ. Electrical Malfunction immediately
P1202 17610 Cyl.2-Fuel Injector Circ. Electrical Malfunction immediately
P1203 17611 Cyl.3-Fuel Injector Circ. Electrical Malfunction immediately
P1204 17612 Cyl.4-Fuel Injector Circ. Electrical Malfunction immediately
P1205 17613 Cyl.5-Fuel Injector Circ. Electrical Malfunction immediately
P1206 17614 Cyl.6-Fuel Injector Circ. Electrical Malfunction immediately
P1213 17621 Cyl.1-Fuel Injector Circ. Short to B+ immediately
P1214 17622 Cyl.2-Fuel Injector Circ. Short to B+ immediately
P1215 17623 Cyl.3-Fuel Injector Circ. Short to B+ immediately
P1216 17624 Cyl.4-Fuel Injector Circ. Short to B+ immediately
P1217 17625 Cyl.5-Fuel Injector Circ. Short to B+ immediately
P1218 17626 Cyl.6-Fuel Injector Circ. Short to B+ immediately
P1250 17658 Fuel level too low off
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01-23

Diagnostic Trouble Code (DTC)
Malfunction text
MIL switching condition
SAE
VAG
P1325 17733 Cyl.1-Knock Control Limit Attained off
P1326 17734 Cyl.2-Knock Control Limit Attained off
P1327 17735 Cyl.3-Knock Control Limit Attained off
P1328 17736 Cyl.4-Knock Control Limit Attained off
P1329 17737 Cyl.5-Knock Control Limit Attained off
P1330 17738 Cyl.6-Knock Control Limit Attained off
P1339 17747 Crankshaft Pos./Engine Speed Sensors Cross connected immediately
P1341 17749 Ignition Coil Power Output Stage 1 Short to Ground immediately
P1343 17751 Ignition Coil Power Output Stage 2 Short to Ground immediately
P1345 17753 Ignition Coil Power Output Stage 3 Short to Ground immediately
P1391 17799 Camshaft Pos.Sensor (B2) Short to Ground immediately
P1392 17800 Camshaft Pos.Sensor Open Circ. (B2) Short to B+ immediately
P1393 17801 Ignition Coil Power Output Stage 1 Electrical Malfunction immediately
P1394 17802 Ignition Coil Power Output Stage 2 Electrical Malfunction immediately
P1395 17803 Ignition Coil Power Output Stage 3 Electrical Malfunction immediately
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