Audi Cars 1999-05

2.8L V6 VIN H Auto 6

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Trouble Code: P1326



Cylinder 2-Knock Control Limit Attained

Possible Causes:



Knock sensor circuit is open
 
Knock sensor circuit is shorted to ground, or shorted to power
 
Knock sensor is damaged or it has failed
 
Poor fuel quality
 
Loosen knock sensors and tighten again to 20 Nm
 
ECM has failed
 

Trouble Code: P1327



Cylinder 3-Knock Control Limit Attained

Possible Causes:



Knock sensor circuit is open
 
Knock sensor circuit is shorted to ground, or shorted to power
 
Knock sensor is damaged or it has failed
 
Poor fuel quality
 
Loosen knock sensors and tighten again to 20 Nm
 
ECM has failed
 

Trouble Code: P1328



Cylinder 4-Knock Control Limit Attained

Possible Causes:



Knock sensor circuit is open
 
Knock sensor circuit is shorted to ground, or shorted to power
 
Knock sensor is damaged or it has failed
 
ECM has failed
 

Trouble Code: P1329



Cylinder 5-Knock Control Limit Attained

Possible Causes:



Knock sensor circuit is open
 
Knock sensor circuit is shorted to ground, or shorted to power
 
Knock sensor is damaged or it has failed
 
Poor fuel quality
 
Loosen knock sensors and tighten again to 20 Nm
 
ECM has failed
 

Trouble Code: P1330



Cylinder 6-Knock Control Limit Attained

Possible Causes:



Knock sensor circuit is open
 
Knock sensor circuit is shorted to ground, or shorted to power
 
Knock sensor is damaged or it has failed
 
Poor fuel quality
 
Loosen knock sensors and tighten again to 20 Nm
 
ECM has failed
 

Trouble Code: P1340



Crankshaft Position/Camshaft Sensor Signal Out of Sequence

Possible Causes:



Engine speed sensor has failed or is contaminated (metal filings)
 
Engine speed sensor-s wheel is damaged
 
Engine speed sensor circuit is shorted to the cable shield
 
Engine speed sensor circuit is open
 
ECM is faulty
 
Canshaft position sensor is faulty
 

Trouble Code: P1391



Camshaft Position Sensor (Bank 2) Short to Ground

Possible Causes:



CMP sensor circuit is open or shorted to ground
 
CMP sensor circuit is shorted to power
 
CMP sensor ground (return) circuit is open
 
CMP sensor installation incorrect (Hall-effect type)
 
CMP sensor is damaged or CMP sensor shielding damaged
 
ECM has failed
 

Trouble Code: P1392



Camshaft Position Sensor (Bank 2) Open/Short to B+

Possible Causes:



CMP sensor circuit is open or shorted to ground
 
CMP sensor circuit is shorted to power
 
CMP sensor ground (return) circuit is open
 
CMP sensor installation incorrect (Hall-effect type)
 
CMP sensor is damaged or CMP sensor shielding damaged
 
ECM has failed
 

Trouble Code: P1409



Tank Ventilation Valve Circuit Malfunction Conditions

Possible Causes:



EVAP canister purge regulator valve has failed
 
Activation wire is shorting to positive
 
EVAP canister system has an improper or broken seal
 
Evaporative Emission (EVAP) canister purge regulator valve 1 is faulty
 
Leak Detection Pump (LDP) is faulty
 
Fuel filler cap is not properly closed
 
Lock ring on fuel pump not tightened
 
Hoses between EVAP canister and purge regulator valve have failed
 
ECM has failed
 

Trouble Code: P1410



Tank Ventilation Valve Circuit Short to B+:

Possible Causes:



EVAP canister purge regulator valve has failed
 
Activation wire is shorting to positive
 
EVAP canister system has an improper or broken seal
 
Evaporative Emission (EVAP) canister purge regulator valve 1 is faulty
 
Leak Detection Pump (LDP) is faulty
 
Fuel filler cap is not properly closed
 
Lock ring on fuel pump not tightened
 
Hoses between EVAP canister and purge regulator valve have failed
 
ECM has failed
 

Trouble Code: P1420



Secondary Air Injector Valve Circuit Electrical Malfunction

Possible Causes:



Connector to the secondary air injection valve is loose or disconnected
 
Secondary air injector valve circuit short
 
Secondary air injector valve circuit is open
 
Faulty secondary air injector valve
 
ECM has failed
 

Trouble Code: P1421



Secondary Air Injector Valve Circuit Short to Ground

Possible Causes:



Connector to the secondary air injection valve is loose or disconnected
 
Secondary air injector valve circuit short
 
Secondary air injector valve circuit is open
 
Faulty secondary air injector valve
 
ECM has failed
 

Trouble Code: P1422



Secondary Air Injector Valve Circuit Short to B+

Possible Causes:



Connector to the secondary air injection valve is loose or disconnected
 
Secondary air injector valve circuit short
 
Secondary air injector valve circuit is open
 
Faulty secondary air injector valve
 
ECM has failed
 

Trouble Code: P1424



Secondary Air Injector System (Bank 1) Leak Detected

Possible Causes:



Poor hose/pipe connections between the secondary air injector pump motor and valve
 
Faulty hoses or pipes
 
Mechanical faults in the secondary air injector system
 

Trouble Code: P1425



Tank Ventilation Valve Short to Ground

Possible Causes:



Activation wire has a short to ground
 
ECM has failed
 
EVAP canister has failed
 
EVAP canister system has an improper or broken seal
 
Evaporative Emission (EVAP) canister purge regulator valve is faulty
 
Leak Detection Pump (LDP) is faulty
 

Trouble Code: P1426



Tank Ventilation Valve Open

Possible Causes:



Activation wire has a short to ground
 
ECM has failed
 
EVAP canister has failed
 
EVAP canister system has an improper or broken seal
 
Evaporative Emission (EVAP) canister purge regulator valve 1 is faulty
 
Leak Detection Pump (LDP) is faulty
 

Trouble Code: P1432



Secondary Air Injection Valve Open

Possible Causes:



Fuel pump relays have failed
 
Fuel injector has failed
 
Hoses on the EVAP canister may be clogged
 
EVAP canister purge regulator valve may be faulty
 
ECM may have failed
 
Manifold Tuning Valve (IMT) may have failed
 

Trouble Code: P1433



Secondary Air Injection System Pump Relay Circuit Open

Possible Causes:



Fuel pump relays have failed
 
Fuel injector has failed
 
Hoses on the EVAP canister may be clogged
 
EVAP canister purge regulator valve may be faulty
 
ECM may have failed
 
Manifold Tuning Valve (IMT) may have failed
 

Trouble Code: P1434



Secondary Air Injection System Pump Relay Circuit Short to B+

Possible Causes:



Fuel pump relays have failed
 
Fuel injector has failed
 
Hoses on the EVAP canister may be clogged
 
EVAP canister purge regulator valve may be faulty
 
ECM may have failed
 
Manifold Tuning Valve (IMT) may have failed
 

Trouble Code: P1435



Secondary Air Injection System Pump Relay Circuit Short to Ground

Possible Causes:



Fuel pump relays have failed
 
Fuel injector has failed
 
Hoses on the EVAP canister may be clogged
 
EVAP canister purge regulator valve may be faulty
 
ECM may have failed
 
Manifold Tuning Valve (IMT) may have failed
 

Trouble Code: P1436



A/C Evaporator Temperature (ACET) Circuit Low Input

Possible Causes:



ACET signal circuit shorted to sensor ground (return)
 
ACET signal circuit shorted to chassis ground
 
ACET sensor is damaged or has failed
 
Check activation of Secondary Air Injection (AIR) Pump Relay
 
ECM has failed
 

Trouble Code: P1471



EVAP Emission Control Leak Detection Pump Circuit Short to B+

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: P1472



EVAP Emission Control Leak Detection Pump Circuit Short to Ground

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: P1473



EVAP Emission Control Leak Detection Pump Circuit Open

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: P1475



EVAP Emission Control LDP Circuit Malfunction/Signal Circuit Open

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: 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
 

 
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