Volkswagen Cars 2000-05

1.8L L4 - Auto 9

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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: P1450



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: P1451



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: P1452



Secondary Air Injector Valve Circuit Open

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: P1470



EVAP Emission Control LDP Circuit Electrical Malfunction

Possible Causes:



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
 
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: 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: P1529



Camshaft Control Circuit Short to B+

Possible Causes:



Fuel pump has failed
 
CPS circuit is open, shorted to ground or shorted to power
 
ECM has failed
 
Battery voltage below 11.5 volts
 
Position actuator circuit may short to B+ or Ground
 
Camshaft timing improperly set, or continuous oil flow to the VCT piston chamber
 
Camshaft advance mechanism (the VCT unit) is sticking or binding mechanically
 
VCT solenoid valve is stuck in open position
 

Trouble Code: P1530



Camshaft Control Circuit Short to Ground

Possible Causes:



Fuel pump has failed
 
CPS circuit is open, shorted to ground or shorted to power
 
ECM has failed
 
Battery voltage below 11.5 volts
 
Position actuator circuit may short to B+ or Ground
 
Camshaft timing improperly set, or continuous oil flow to the VCT piston chamber
 
Camshaft advance mechanism (the VCT unit) is sticking or binding mechanically
 
VCT solenoid valve is stuck in open position
 

Trouble Code: P1531



Camshaft Control Circuit Open

Possible Causes:



Fuel pump has failed
 
CPS circuit is open, shorted to ground or shorted to power
 
ECM has failed
 
Battery voltage below 11.5 volts
 
Position actuator circuit may short to B+ or Ground
 
Camshaft timing improperly set, or continuous oil flow to the VCT piston chamber
 
Camshaft advance mechanism (the VCT unit) is sticking or binding mechanically
 
VCT solenoid valve is stuck in open position
 

Trouble Code: P1539



Clutch Vacuum Vent Valve Switch Incorrect Signal

Possible Causes:



Signal from clutch vacuum vent valve switch is faulty
 
Clutch vacuum vent valve is faulty
 
Circuit wires are short circuiting to each other, to vehicle ground or to B+
 
ECM has failed
 

Trouble Code: P1541



Fuel Pump Relay Circuit Open

Possible Causes:



Fuel pump relay not activiated
 

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: P1546



Boost Pressure Control Valve Short to B+

Possible Causes:



Charge air pressure sensor is faulty
 
Voltage supply to the charge air pressure sensor is open or shorted
 
Check the charge air system for leaks
 
Recirculating valve for turbocharger is faulty
 
Turbocharging system is damaged or not functioning properly
 
Turbocharger recirculating valve is faulty
 
Vacuum diaphragm for turbocharger is out of adjustment
 
Wastegate bypass regulator valve is faulty
 
Boost sensor has failed
 
ECM has failed
 

Trouble Code: P1547



Boost Pressure Control Valve Short to Ground

Possible Causes:



Charge air pressure sensor is faulty
 
Voltage supply to the charge air pressure sensor is open or shorted
 
Check the charge air system for leaks
 
Recirculating valve for turbocharger is faulty
 
Turbocharging system is damaged or not functioning properly
 
Turbocharger recirculating valve is faulty
 
Vacuum diaphragm for turbocharger is out of adjustment
 
Wastegate bypass regulator valve is faulty
 
Boost sensor has failed
 
ECM has failed
 

Trouble Code: P1548



Boost Pressure Control Valve Open

Possible Causes:



Charge air pressure sensor is faulty
 
Voltage supply to the charge air pressure sensor is open or shorted
 
Check the charge air system for leaks
 
Recirculating valve for turbocharger is faulty
 
Turbocharging system is damaged or not functioning properly
 
Turbocharger recirculating valve is faulty
 
Vacuum diaphragm for turbocharger is out of adjustment
 
Wastegate bypass regulator valve is faulty
 
Boost sensor has failed
 
ECM has failed
 

Trouble Code: P1550



Charge Pressure Deviation

Possible Causes:



Charge air system leaks
 
Recirculating valve for turbocharger is faulty
 
Turbocharging system is damaged
 
Vacuum diaphragm for turbocharger needs adjusting
 
Wastegate bypass regulator valve is faulty
 
ECM has failed
 

Trouble Code: P1555



Charge Pressure Upper Limit Exceeded

Possible Causes:



Charge air system leaks
 
Recirculating valve for turbocharger is faulty
 
Turbocharging system is damaged
 
Vacuum diaphragm for turbocharger needs adjusting
 
Wastegate bypass regulator valve is faulty
 
ECM has failed
 

Trouble Code: P1556



Charge Pressure Control Negative Deviation

Possible Causes:



Charge air system leaks
 
Recirculating valve for turbocharger is faulty
 
Turbocharging system is damaged
 
Vacuum diaphragm for turbocharger needs adjusting
 
Wastegate bypass regulator valve is faulty
 
ECM has failed
 

Trouble Code: P1557



Charge Pressure Control Positive Deviation

Possible Causes:



Charge air system leaks
 
Recirculating valve for turbocharger is faulty
 
Turbocharging system is damaged
 
Vacuum diaphragm for turbocharger needs adjusting
 
Wastegate bypass regulator valve is faulty
 
ECM has failed
 

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: P1559



Idle Speed Control Throttle Position Adaptation 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: P1568



Idle Speed Control Throttle Position Mechanical Malfunction

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: P1569



Cruise Control Switch Incorrect Signal

Possible Causes:



Check Cruise Control System (CCS) wiring shorts to ground or B+
 

 
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