instrument cluster AUDI A4 1996 B5 / 1.G APB Engine Motronic Syst

01-2

The Exhaust Malfunction Indicator Light (MIL) in
the instrument cluster will be switched on if the
engine control module recognizes malfunctions
which have an affect (decrease emissions) on
exhaust emissions Page 01
-3 .

Malfunctions relating to the electronic throttle
are also indicated by a Electronic Power
Control (EPC) warning light in the instrument
cluster.
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01-19
Diagnostic Trouble Code (DTC) table

Notes:

If malfunctions occur in the sensors and components being monitored, they will be stored in the DTC memory together
with an indication of the type of malfunction. Notes on Engine Power Control (EPC) (drive by wire) Page 24
-139
.
Malfunctions relating to the electronic throttle are also indicated by the EPC (Electronic Power Control) warning light in the
instrument cluster.
Malfunction which decrease exhaust emissions are indicated by an Exhaust Malfunction Indicator Light (MIL), the MIL is
located in the instrument cluster. As soon as certain malfunction are recognized, the MIL is switched on immediately.
There are also malfunctions, were the MIL is switched on only after the engine is started again.
Sporadically occurring malfunctions (temporary malfunctions) will be indicated on the VAG1551 display as "SP."
The DTC table is arranged according to the 5-digit DTC in the left-hand column.
If a malfunction is stored in the DTC memory and then does not occur again during the next 40 engine warm-up phases,
the DTC will be automatically erased.
Components that are indicated as being faulty by the VAG1551 should not be replaced immediately. Always start by
checking the wiring, connectors and Ground (GND) connections for the component using the current wiring diagram. This
is particularly important in the case of sporadic malfunctions (indicated by the letters "SP"on the scan tool display).
If the connector for the engine control module is disconnected or if the battery is disconnected, all the learned values
(adaptation values) stored in the control module will be erased, although the contents of the DTC memory will remain
intact. The next time the engine is started the idling may be rough at first. In this case let the engine run at idle for a few
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01-39

DTC
Description of malfunction
Corrective action
SAE
VAG


P1171 17579 Throttle Actuation Potentiometer
Signal 2
Range/Performance
1) 3)
- Check throttle actuation potentiometer Page 24
-153
.
P1172 17580 Throttle Actuation Potentiometer
Signal 2
Signal too Low
1) 3)


P1173 17581 Throttle Actuation Potentiometer
Signal 2
Signal too High
1) 3)


P1176 17584 O2 Correction Behind Catalyst, B1
Limit Attained
2) - Check oxygen sensor aging of oxygen sensors before catalytic
converters Page 24
-93

P1177 17585 O2 Correction Behind Catalyst, B2
Limit Attained
2) - Check oxygen sensors and
oxygen sensor control behind catalytic converters Page 24
-100
1) With this malfunction the EPC (Electronic Power Control) Malfunction Indicator Light (MIL) in the instrument cluster is
switched on by the ECM immediately after the malfunction has been recognized. Significance of EPC malfunction indicator
light Page 24
-142
.
2) With this malfunction the exhaust Malfunction Indicator Light (MIL) is only switched on by the ECM, if the malfunction is
recognized after the engine has been restarted. Significance of MIL Page 01
-3 .
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01-43

DTC
Description of malfunction
Corrective action
SAE
VAG


P1250 17658 Fuel Level
Too Low
4)
Repair Manual, Electrical Equipment, Repair Group 01
- Fill fuel tank and erase DTC memory
- Check DTC memory from instrument cluster.
4) The malfunction "Fuel Level too Low" will be stored if the fuel level in the tank is or was too low. The malfunction remains as
a static malfunction and will not be set a sporadic malfunction even if the customer fills the tank with fuel in the meantime.
Therefore it is possible to recognize malfunctions which have been stored due to lack of fuel e.g.: misfiring or malfunction
regarding oxygen sensor control.
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01-46

DTC
Description of malfunction
Corrective action
SAE
VAG


P1335 17743 Engine Torque Monitoring 2
Control Limit Exceeded
1) 3)
- Check hoses Page 24
-170

- Check Intake Air Temperature (IAT) sensor Page 28
-17
- Check Mass Air Flow (MAF) sensor Page 24
-59
- Check Engine Coolant Temperature (ECT) sensor Page 28
-25
P1336 17744 Engine Torque Monitoring
Adaptation at limit - Check hoses Page 24
-170

- Check Intake Air Temperature (IAT) sensor Page 28
-17
- Check Mass Air Flow (MAF) sensor Page 24
-59
- Check Engine Coolant Temperature (ECT) sensor Page 28
-25
1) With this malfunction the EPC (Electronic Power Control) Malfunction Indicator Light (MIL) in the instrument cluster is
switched on by the ECM. Significance of EPC malfunction indicator light Page 24
-142
.
3) With this malfunction the exhaust Malfunction Indicator Light (MIL) is switched on by the ECM, immidiately after the
malfunction has been recognized. Significance of MIL Page 01
-3 .
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01-51

DTC
Description of malfunction
Corrective action
SAE
VAG


P1386 17794 Internal Control Module
Knock Control Circ.Error - Replace Engine Control Module (ECM) Page 24
-24
P1387 17795 Internal Control Module
Altitude Sensor Error
2)

P1388 17796 Internal Control Module
Drive by wire error
1) 3)

1) With this malfunction the EPC (Electronic Power Control) Malfunction Indicator Light (MIL) in the instrument cluster is
switched on by the ECM. Significance of EPC malfunction indicator light Page 24
-142
.
2) With this malfunction the exhaust Malfunction Indicator Light (MIL) is only switched on by the ECM, if the malfunction is
recognized after the engine has been restarted. Significance of MIL Page 01
-3 .
3) With this malfunction the exhaust Malfunction Indicator Light (MIL) is switched on by the ECM, immediately after the
malfunction has been recognized. Significance of MIL Page 01
-3 .
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P1548 17956 Boost Pressure
Contr.Valve
Open
1) With this malfunction the EPC (Electronic Power Control) Malfunction Indicator Light (MIL) in the instrument cluster is
switched on by the ECM immediately after the malfunction has been recognized. Significance of EPC malfunction indicator
light Page 24
-142
.
3) With this malfunction the exhaust Malfunction Indicator Light (MIL) is switched on by the ECM, immidiately after the
malfunction has been recognized. Significance of MIL Page 01
-3 .
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01-66

DTC
Description of malfunction
Corrective action
SAE
VAG


P1558 17966 Throttle Actuator
Electrical Malfunction
1)3)
- Check throttle valve control module Page 24
-145
P1559 17967 Idle Speed Contr. Throttle Pos.
Adaptation Malfunction
2) - Perform adaptation Page 24
-146
P1560 17968 Maximum Engine Speed Exceeded
- Repair mechanical damage
P1564 17972 Idle Speed Control Throttle Position
Low Voltage During Adaptation - Charge battery or repeat adaptation Page 24
-146
P1565 17973 Idle Speed Control Throttle Position
Lower Limit not Attained
1) 3)
- Check throttle valve control module Page 24
-145
P1568 17976 Idle Speed Control Throttle Position
Mechanical Malfunction
1) 3)

1) With this malfunction the EPC (Electronic Power Control) Malfunction Indicator Light (MIL) in the instrument cluster is
switched on by the ECM. Significance of EPC malfunction indicator light Page 24
-142
.
2) With this malfunction the exhaust Malfunction Indicator Light (MIL) is only switched on by the ECM, if the malfunction is
recognized after the engine has been restarted. Significance of MIL Page 01
-3 .
3) With this malfunction the exhaust Malfunction Indicator Light (MIL) is switched on by the ECM, immediately after the
Pa
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01-68

DTC
Description of
malfunction
Corrective action
SAE
VAG


P1603 18011 Internal Control Module
Malfunction
2) - Replace Engine Control Module (ECM) Page 24
-24
.
P1604 18012 Internal Control Module
Malfunction
1)3)

P1606 18014 Rough Road Spec Engine
Torque ABS-ECU
Electrical Malfunction
Electrical Wiring Diagrams, Troubleshooting & Component Locations - Check wire connection between ECM and ABS control module Page 24
-
198

P1609 18017 Crash shut-down
activated Accident with airbag triggered or a output Test Diagnostic Mode (TDM) has
been carried out, therefore erase DTC Memory in ECM; Notes crash signal
Page 24
-196

P1612 18020 Electronic Control Module
2)
Incorrect Coding - Check or code Engine Control Module (ECM) Page 01
-93
1) With this malfunction the EPC (Electronic Power Control) Malfunction Indicator Light (MIL) in the instrument cluster is
switched on by the ECM. Significance of EPC malfunction indicator light Page 24
-142
.
2) With this malfunction the exhaust Malfunction Indicator Light (MIL) is only switched on by the ECM, if the malfunction is
recognized after the engine has been restarted. Significance of MIL Page 01
-3 .
3) With this malfunction the exhaust Malfunction Indicator Light (MIL) is switched on by the ECM, immediately after the
malfunction has been recognized. Significance of MIL Page 01
-3 .
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01-69

DTC
Description of malfunction
Corrective action
SAE
VAG


P1620 18028 Engine coolant temperature signal
Open/short to B+
P1621 18029 Engine coolant temperature signal
Short to ground - Check coolant temperature signal Page 24
-181
P1622 18030 Engine coolant temperature signal
Range/Performance Note for malfunctions P1620, P1621 and P1622:
The Engine Control Module (ECM) receives the "Coolant temperature signal" from the instrument cluster. When the ECM
receives this signal the boost pressure will be decreased.
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