Audi Cars 1999-05

2.8L V6 VIN H Std 6

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Trouble Code: P1476



EVAP Emission Control LDP Circuit Malfunction/Insufficient Vacuum

Possible Causes:



Leak Detection Pump has failed
 
EVAP canister system has an improper or broken seal
 
Evaporative Emission (EVAP) canister purge regulator valve 1 is faulty
 
Hoses between the fuel pump and the EVAP canister are faulty
 
Fuel filler cap is loose
 
Fuel pump seal is defective, faulty or otherwise leaking
 
Hoses between the EVAP canister and the fuel flap unit are faulty
 
Hoses between the EVAP canister and the evaporative emission canister purge regulator valve are faulty
 
ECM has failed
 

Trouble Code: P1477



EVAP Emission Control LDP Circuit Malfunction

Possible Causes:



Leak Detection Pump has failed
 
EVAP canister system has an improper or broken seal
 
Evaporative Emission (EVAP) canister purge regulator valve 1 is faulty
 
Hoses between the fuel pump and the EVAP canister are faulty
 
Fuel filler cap is loose
 
Fuel pump seal is defective, faulty or otherwise leaking
 
Hoses between the EVAP canister and the fuel flap unit are faulty
 
Hoses between the EVAP canister and the evaporative emission canister purge regulator valve are faulty
 
ECM has failed
 

Trouble Code: P1478



EVAP Emission Control LDP Circuit Clamped Tube Detected

Possible Causes:



Leak Detection Pump has failed
 
EVAP canister system has an improper or broken seal
 
Evaporative Emission (EVAP) canister purge regulator valve 1 is faulty
 
Hoses between the fuel pump and the EVAP canister are faulty
 
Fuel filler cap is loose
 
Fuel pump seal is defective, faulty or otherwise leaking
 
Hoses between the EVAP canister and the fuel flap unit are faulty
 
Hoses between the EVAP canister and the evaporative emission canister purge regulator valve are faulty
 
ECM has failed
 

Trouble Code: P1500



Fuel Pump Relay Circuit Electrical Malfunction

Possible Causes:



Fuel delivery unit connector is loose or not attached
 
Fuse 18 cause a short to the transfer fuel pump or the O2S
 
Fuel pump has failed
 
Fuel pump relay circuit is shorted to ground, B+ or is open
 
Fuel Pump (FP) Relay not activated
 
ECM has failed
 

Trouble Code: P1501



Fuel Pump Relay Circuit Electrical Short to Ground

Possible Causes:



Fuel delivery unit connector is loose or not attached
 
Fuse 18 cause a short to the transfer fuel pump or the O2S
 
Fuel pump has failed
 
Fuel pump relay circuit is shorted to ground, B+ or is open
 
Fuel Pump (FP) Relay not activated
 
ECM has failed
 

Trouble Code: P1502



Fuel Pump Relay Circuit Short to B+

Possible Causes:



Fuel delivery unit connector is loose or not attached
 
Fuse 18 cause a short to the transfer fuel pump or the O2S
 
Fuel pump has failed
 
Fuel pump relay circuit is shorted to ground, B+ or is open
 
Fuel Pump (FP) Relay not activated
 
ECM has failed
 

Trouble Code: P1512



Intake Manifold Changeover Valve Circuit Short to B+

Possible Causes:



Leaky vacuum reservoir, vacuum lines loose or damaged
 
Vacuum solenoid or vacuum actuator is damaged
 
IMRC actuator cable/gears are seized, or the cables are improperly routed or seized
 
IMRC housing return springs are damaged or disconnected
 
Lever/shaft return stop may be obstructed or bent, or the lever/shaft wide open stop may be obstructed or bent, or the IMRC lever/shaft may be sticking, binding or disconnected
 
IMRC control circuit open, shorted or the VPWR circuit is open
 
ECM has failed
 

Trouble Code: P1515



Intake Manifold Changeover Valve Circuit Short to Ground

Possible Causes:



Leaky vacuum reservoir, vacuum lines loose or damaged
 
Vacuum solenoid or vacuum actuator is damaged
 
IMRC actuator cable/gears are seized, or the cables are improperly routed or seized
 
IMRC housing return springs are damaged or disconnected
 
Lever/shaft return stop may be obstructed or bent, or the lever/shaft wide open stop may be obstructed or bent, or the IMRC lever/shaft may be sticking, binding or disconnected
 
IMRC control circuit open, shorted or the VPWR circuit is open
 
ECM has failed
 

Trouble Code: P1516



Intake Manifold Runner Control Input Error (Bank 1)

Possible Causes:



IMRC mechanical fault - the linkage may be bound or seized
 
Inspect for binding or improper routing. The cable core wire at the IMRC/IMSC housing attachment must have slack and lever must contact close plate stop screw
 

Trouble Code: P1517



Main Relay Circuit Electrical Malfunction

Possible Causes:



Engine Control Module (ECM) has failed
 
Voltage supply for Engine Control Module (ECM) is faulty
 
Check activation of Motronic Engine Control Module (ECM) Power Supply Relay
 

Trouble Code: P1519



Intake Manifold Runner Control Stuck Closed

Possible Causes:



IMRC monitor signal circuit shorted to power ground
 
IMRC Monitor signal circuit shorted to signal ground (return)
 
IMRC actuator is damaged or has failed (e.g., there may be a small leak in the vacuum diaphragm of the actuator)
 
ECM has failed
 

Trouble Code: P1522



Intake Camshaft Control (Bank 2) Malfunction

Possible Causes:



Camshaft control circuit is open or shorted to ground
 
Camshaft sensor is damaged or the ECM has failed
 
Camshaft out of adjustment
 

Trouble Code: P1542



Throttle Actuation Potentiometer Range/Performance

Possible Causes:



Throttle valve control module is faulty
 
Throttle valve is damaged or dirty
 
Throttle valve must be in closed throttle position
 
Accelerator pedal is out of adjustment (AEG engines only)
 
Throttle position actuator is shorting to ground or power
 

Trouble Code: P1543



Throttle Actuation Potentiometer Signal Too Low

Possible Causes:



Throttle valve control module is faulty
 
Throttle valve is damaged or dirty
 
Throttle valve must be in closed throttle position
 
Accelerator pedal is out of adjustment (AEG engines only)
 
Throttle position actuator is shorting to ground or power
 

Trouble Code: P1544



Throttle Actuation Potentiometer Signal Too High

Possible Causes:



Throttle valve control module is faulty
 
Throttle valve is damaged or dirty
 
Throttle valve must be in closed throttle position
 
Accelerator pedal is out of adjustment (AEG engines only)
 
Throttle position actuator is shorting to ground or power
 

Trouble Code: P1545



Throttle Position Control Malfunction

Possible Causes:



Throttle valve control module is faulty
 
Throttle valve is damaged or dirty
 
Throttle valve must be in closed throttle position
 
Accelerator pedal is out of adjustment (AEG engines only)
 
Throttle position actuator is shorting to ground or power
 

Trouble Code: P1558



Throttle Actuator Electrical Malfunction

Possible Causes:



Throttle valve control module has failed
 
Throttle valve control module-s circuit has shorted or is open
 
The ECM has failed
 

Trouble Code: P1560



Maximum Engine Speed Exceeded

Possible Causes:



Throttle valve control module has failed
 
Throttle valve control module-s circuit has shorted or is open
 
The ECM has failed
 
General engine damage
 

Trouble Code: P1564



Idle Speed Control Throttle Position Low Voltage During Adaptation

Possible Causes:



Alternator failed
 
ECM failed
 
Fuses blown or open circuits
 
Clean Throttle Valve Control Module
 
Faulty battery
 
Idle speed control throttle failed
 
Wire connections to relay carrier and ground connection of ECM may have shorted
 

Trouble Code: P1565



Idle Speed Control Throttle Position Lower Limit Not Attainted

Possible Causes:



Alternator failed
 
ECM failed
 
Fuses blown or open circuits
 
Clean Throttle Valve Control Module
 
Accelerator cable not adjusted properly
 
Idle speed control throttle failed
 
Wire connections to relay carrier and ground connection of ECM may have shorted
 

Trouble Code: P1602



Power Supply (B+) Terminal 15 Low Voltage

Possible Causes:



(If ECM was replaced) ECM ID not the same as the replaced unit
 
ECM has failed
 
Voltage supply for Engine Control Module (ECM) has shorted
 

Trouble Code: P1603



Internal Control Module Malfunction

Possible Causes:



(If ECM was replaced) ECM ID not the same as the replaced unit
 
ECM has failed
 
Voltage supply for Engine Control Module (ECM) has shorted
 

Trouble Code: P1604



Internal Control Module Driver Error

Possible Causes:



(If ECM was replaced) ECM ID not the same as the replaced unit
 
ECM has failed
 
Voltage supply for Engine Control Module (ECM) has shorted
 

Trouble Code: P1606



Rough Road Spec Engine Torque ABS-ECU Electrical Malfunction

Possible Causes:



Check wire connection between Engine Control Module (ECM) and ABS Control Module
 

Trouble Code: P1612



Electronic Control Module Incorrect Coding

Possible Causes:



(If ECM was replaced) ECM ID not the same as the replaced unit
 
ECM has failed
 
Voltage supply for Engine Control Module (ECM) has shorted
 

Trouble Code: P1624



MIL Requested Signature Active

Possible Causes:



(If ECM was replaced) ECM ID not the same as the replaced unit
 
ECM has failed
 
Voltage supply for Engine Control Module (ECM) has shorted
 

Trouble Code: P1626



Data BUS Powertrain Missing Message From Transmission Control

Possible Causes:



(If ECM was replaced) ECM ID not the same as the replaced unit
 
ECM has failed
 
Voltage supply for Engine Control Module (ECM) has shorted
 

Trouble Code: P1640



Internal Control Module (EEPROM) Error

Possible Causes:



Engine Control Module (ECM) has failed
 
Voltage supply for Engine Control Module (ECM) has shorted
 

Trouble Code: P1690



Malfunction Indication Light Malfunction

Possible Causes:



Wire from ECM to MIL is shorted or grounded
 
ECM has failed
 
MIL has failed
 

Trouble Code: P1912



Brake Booster Pressure Sensor Short Circuit to B+

Possible Causes:



Circuit short to ground or open
 
Brake booster pressure sensor has failed or is dirty
 
ECM has failed
 

Trouble Code: P1913



Brake Booster Pressure Sensor Short Circuit to Ground

Possible Causes:



Circuit short to ground or open
 
Brake booster pressure sensor has failed or is dirty
 
ECM has failed
 

Trouble Code: P2096



Post Catalyst Fuel Trim System Too Lean (Bank 1)

Possible Causes:



Oxygen sensor (before catalytic converter) is faulty
 
Oxygen sensor (behind catalytic converter) is faulty
 
Oxygen sensor heater (before catalytic converter) is faulty
 
Oxygen sensor heater (behind catalytic converter) is faulty
 
Check circuits for shorts to each other, ground or power
 
ECM has failed
 

Trouble Code: P2097



Post Catalyst Fuel Trim System Too Rich (Bank 1)

Possible Causes:



Oxygen sensor (before catalytic converter) is faulty
 
Oxygen sensor (behind catalytic converter) is faulty
 
Oxygen sensor heater (before catalytic converter) is faulty
 
Oxygen sensor heater (behind catalytic converter) is faulty
 
Check circuits for shorts to each other, ground or power
 
ECM has failed
 

Trouble Code: P2098



Post Catalyst Fuel Trim System Too Lean (Bank 2)

Possible Causes:



Oxygen sensor (before catalytic converter) is faulty
 
Oxygen sensor (behind catalytic converter) is faulty
 
Oxygen sensor heater (before catalytic converter) is faulty
 
Oxygen sensor heater (behind catalytic converter) is faulty
 
Check circuits for shorts to each other, ground or power
 
ECM has failed
 

Trouble Code: P2099



Post Catalyst Fuel Trim System Too Rich (Bank 2)

Possible Causes:



Oxygen sensor (before catalytic converter) is faulty
 
Oxygen sensor (behind catalytic converter) is faulty
 
Oxygen sensor heater (before catalytic converter) is faulty
 
Oxygen sensor heater (behind catalytic converter) is faulty
 
Check circuits for shorts to each other, ground or power
 
ECM has failed
 

Trouble Code: P2101



Throttle Actuator Control Motor Range/Performance

Possible Causes:



TACM wiring harness connector is damaged or open
 
TACM wiring may be crossed in the wire harness assembly
 
TACM (motor) circuit is open, or TACM assembly is damaged (possible open circuit)
 
TACM or the Throttle Valve is dirty
 
Throttle Position sensor has failed
 
ECM has failed
 

Trouble Code: P2106



Throttle Actuator Control System - Forced Limited Power Conditions

Possible Causes:



TACM wiring harness connector is damaged or open
 
TACM wiring may be crossed in the wire harness assembly
 
TACM (motor) circuit is open, or TACM assembly is damaged (possible open circuit)
 
TACM or the Throttle Valve is dirty
 
Throttle Position sensor has failed
 
ECM has failed
 

Trouble Code: P2122



Accelerator Pedal Position Sensor -D- Circuit Low Input

Possible Causes:



Ground between engine and chassis may be broken
 
Throttle position sensor may have failed
 
Accelerator Pedal Position Sensor has failed
 
Throttle position sensor wiring may have shorted
 
Throttle position sensor has failed
 
Faulty voltage supply
 
ECM has failed
 

Trouble Code: P2123



Accelerator Pedal Position Sensor -D- Circuit High Input

Possible Causes:



Ground between engine and chassis may be broken
 
Throttle position sensor may have failed
 
Accelerator Pedal Position Sensor has failed
 
Throttle position sensor wiring may have shorted
 
Throttle position sensor has failed
 
Faulty voltage supply
 
ECM has failed
 

Trouble Code: P2127



Accelerator Pedal Position Sensor -E- Circuit Low Input

Possible Causes:



Ground between engine and chassis may be broken
 
Throttle position sensor may have failed
 
Accelerator Pedal Position Sensor has failed
 
Throttle position sensor wiring may have shorted
 
Throttle position sensor has failed
 
Faulty voltage supply
 
ECM has failed
 

 
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