Control module and output signals

WARNING: This page is about a different car, the 2006 Audi A4, 2005 Audi A4, 2004 Audi A4, 2003 Audi A4, and 2002 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.

DTC	Error Message	Diagnostic Procedure	Malfunction Criteria and Threshold Value	Secondary Parameters with Enable Conditions	Monitoring Time Length	Frequency of checks, MIL Illumination
P0600	Serial Communication Link (AVK only)	Check CAN-Bus wiring from J285 Control Module in dash and ECM J220.	Short to battery + Short to ground. Core connection ECM no signal from can bus	Battery voltage - >10.7 V	0.5 Sec
P0601	Internal Control Module Memory Check Sum Error	Replace the Motronic Engine Control Module (ECM) J220. Refer to → Motronic Engine Control Module (ECM) J220, Replacing .	Internal check sum, incorrect	---	0.5 Sec	2 DCY
P0602	Control Module Programming Error	Replace the Motronic Engine Control Module (ECM) J220. Refer to → Motronic Engine Control Module (ECM) J220, Replacing .	Message arriving from automatic transmission while ECU is calibrated for manual transmission.	Battery voltage - >10.7V	0.5 Sec	2 DCY
P0604	Internal Control Module Random Access Memory (RAM) Error	Replace the Motronic Engine Control Module (ECM) J220. Refer to → Motronic Engine Control Module (ECM) J220, Replacing .	Write ability check, failed	---	0.5 Sec	2 DCY
P0605	Internal Control Module Read Only Memory (ROM) Error	Replace the Motronic Engine Control Module (ECM) J220. Refer to → Motronic Engine Control Module (ECM) J220, Replacing .	Wrong check sum	---	0.5 Sec	2 DCY
P0606	ECM/PCM Processor	Replace the Motronic Engine Control Module (ECM) J220. Refer to → Motronic Engine Control Module (ECM) J220, Replacing .	Short to battery + >4.88 V. Short to ground 0.14 V 80% of max current longer than >0.6 Sec Wrong value Comparison with stored value Other monitoring function out of range Torque out of range	---	2 Sec 0.6 Sec 0.5 Sec	2 DCY
P0627	Fuel Pump A Control Circuit/Open (BGN only)	Refer to → Fuel Supply System	Short to ground 3.0 V Open circuit 4.5 5.5 V	Engine speed - > 80 RPM	0.5 Sec	Continuous 2 DCY
P0629	Fuel Pump A Control Circuit High (BGN only)	Refer to → Fuel Supply System	Short to battery + 0.6 - 1.2 A	Engine speed - > 80 RPM	0.5 Sec	Continuous 2 DCY
P0638	Throttle Actuator Control Range/Performance - Bank 1	Check the Throttle Valve Control Module J338. Refer to → Throttle Valve Control Module J338, Checking Check the Throttle Drive Angle Sensor 1 (for Electronic Power Control (EPC)) G187/Throttle Drive Angle Sensor 2 (for Electronic Power Control (EPC)) G188. Refer to → Throttle Position Sensor G79 and Accelerator Pedal Position Sensor 2 G185, Checking .	Open 15% t > 0.14 sec. Then Close to 3% t > 0.56 sec. Voltage ranges Sensor 1- 0.21 to 0.87 V. Sensor 2 - 4.14 to 4.84 V Comparison of upper and lower reference points with stored limits	Ignition on Engine speed - 0 RPM Intake air temp. - > 5°C Vehicle speed - 0 mph ECT - > 5°C	5 Sec	2 DCY
P0685	ECM/PCM Power Relay Control Circuit/Open	Check the voltage supply for Motronic Engine Control Module (ECM) J220. Refer to → Voltage Supply, Checking . Check the activation of Engine Control Module (ECM) Power Supply Relay J271. Refer to → Motronic Engine Control Module (ECM) Power Supply Relay J271, Checking .	Open circuit. Control voltage >0.7 V	Sense circuit voltage >4.0 V	0.5 Sec	2 DCY
P0686	ECM/PCM Power Relay Control Circuit Low	Check the voltage supply for Motronic Engine Control Module (ECM) J220. Refer to → Voltage Supply, Checking . Check the activation of Engine Control Module (ECM) Power Supply Relay J271. Refer to → Motronic Engine Control Module (ECM) Power Supply Relay J271, Checking .	Short to ground. Control voltage 0.51 V	Sense circuit voltage >5.5V	0.5 Sec	2 DCY
P0687	ECM/PCM Power Relay Control Circuit High	Check the voltage supply for Motronic Engine Control Module (ECM) J220. Refer to → Voltage Supply, Checking . Check the activation of Engine Control Module (ECM) Power Supply Relay J271. Refer to → Motronic Engine Control Module (ECM) Power Supply Relay J271, Checking .	Short to battery +. Control voltage >4.0 V	Sense circuit voltage >4.0V	0.5 Sec	2 DCY
P0688	ECM/PCM Power Relay Sense Circuit/Open	Check the voltage supply for Motronic Engine Control Module (ECM) J220. Refer to → Voltage Supply, Checking . Check the activation of Engine Control Module (ECM) Power Supply Relay J271. Refer to → Motronic Engine Control Module (ECM) Power Supply Relay J271, Checking .	Voltage too low 4.0 V	Main relay - On	0.5 Sec	2 DCY