Diagnostics and testing 4.4L (Discovery 3)

Inspection and verification

1. Ensure that the customer's complaint is justified.

2. Visually check for obvious signs of mechanical damage.

Mechanical factors

Leaks Metal fatigue Pipes Catalytic converter Silencer(s) Connections Supports Clearance around elements

3. If an obvious cause for the problem you identified or the customer described is found, resolve it before moving on to further action. (if possible).

Table of signs of malfunction

Sign of malfunction	Possible reasons	Action
Noise or leaks in the exhaust system	Exhaust system/system elements	If necessary, install new elements. Refer to the relevant section in the service station manual.
Insufficient power	Air intake system malfunction Clogged exhaust system Low fuel pressure Exhaust Gas Recirculation (EGR) Valve(s) Malfunction Turbocharger failure	Check the air intake system. Check the muffler or catalytic converter for blockages, install new components if necessary. Check the fuel system pressure. EGR and turbocharger checks are described in the relevant sections of the service station manual.

[Original version of the article on the website: www.LRman.ru]

DTC Index

NOTE: Generic scan tools cannot read the codes listed or can only read 5-digit codes. Match the 5 digits from the scan tool with the first 5 digits of the listed 7-digit code to identify the fault. (the last 2 digits provide additional information readable by a manufacturer approved diagnostic system).

NOTE: For a complete listing of ECM DTCs, refer to Section 303-14, Electronic Engine Control System, in the service manual.

DTC	Description	Possible reasons	Action
P003100	Heated Oxygen Sensor Heater Control Circuit Low Voltage (row 1, sensor 1)	Heated Oxygen Sensor Heater Power Circuit High Resistance Heated Oxygen Sensor Heater Control Circuit High Resistance Heated oxygen sensor heater malfunction.	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P003200	Heated Oxygen Sensor Heater Control Circuit High Voltage (row 1, sensor 1)	Heated Oxygen Sensor Heater Power Circuit High Resistance Heated Oxygen Sensor Heater Control Circuit High Resistance Heated oxygen sensor heater malfunction.	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P003600	Heated Oxygen Sensor Heater Control Circuit (row 1, sensor 2)	Short to ground in catalytic converter monitoring sensor heater control circuit Catalytic Converter Monitoring Sensor Heater Control Circuit High Resistance Catalytic converter monitoring sensor heating element malfunction	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P005100	Heated Oxygen Sensor Heater Control Circuit Low Voltage (row 2, sensor 1)	Heated Oxygen Sensor Heater Power Circuit High Resistance Heated Oxygen Sensor Heater Control Circuit High Resistance Heated oxygen sensor heater malfunction.	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P005200	Heated Oxygen Sensor Heater Control Circuit High Voltage (row 2, sensor 1)	Heated Oxygen Sensor Heater Power Circuit High Resistance Heated Oxygen Sensor Heater Control Circuit High Resistance Heated oxygen sensor heater malfunction.	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P005600	Heated Oxygen Sensor Heater Control Circuit (row 2, sensor 2)	Catalytic Converter Monitoring Sensor Heater Control Circuit (left bank of cylinders): short circuit to ground Catalytic Converter Monitoring Sensor Heater Control Circuit High Resistance Catalytic converter monitoring sensor heating element malfunction	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P01301A	O2 electrical circuit (row 1, sensor 1)	Heated oxygen sensor (right bank of cylinders): low impedance element Heated oxygen sensor malfunction.	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P01301B	O2 electrical circuit (row 1, sensor 1)	Heated oxygen sensor (right bank of cylinders): high impedance element Heated oxygen sensor malfunction.	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P013100	Low Voltage in O2 Circuit (row 1, sensor 1)	Heated Oxygen Sensor Signal Circuit High Resistance Heated Oxygen Sensor Signal Circuit Short to Ground Heated oxygen sensor malfunction.	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P013200	High voltage in O2 circuit (row 1, sensor 1)	Heated Oxygen Sensor Signal Circuit (right bank of cylinders): short circuit to battery + Heated oxygen sensor malfunction.	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P013300	Slow response of the O2 electrical circuit (row 1, sensor 1)	Heated oxygen sensor (right bank of cylinders): High resistance in the circuit connecting the sensor to the ECM Leak in the exhaust system HO2 sensor malfunction	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P013400	No O2 electrical circuit activity (row 1, sensor 1)	Heated oxygen sensor (right bank of cylinders): slow turn on	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P013700	Low Voltage in O2 Circuit (row 1, sensor 2)	Catalytic Converter Monitoring Sensor(right bank of cylinders): High resistance in the circuit connecting the sensor to the ECM Short circuit of the electrical circuit of the catalytic converter monitoring sensor to ground Catalytic converter monitoring sensor malfunction	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P013800	High voltage in O2 circuit (row 1, sensor 2)	Catalytic Converter Monitoring Sensor Signal Circuit (right bank of cylinders): short circuit to battery + Catalytic converter monitoring sensor malfunction	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P013900	Slow response of the O2 electrical circuit (row 1, sensor 2)	Catalytic Converter Monitoring Sensor(right bank of cylinders): slow reaction	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P014000	No O2 electrical circuit activity (row 1, sensor 2)	Catalytic Converter Monitoring Sensor(right bank of cylinders): High resistance in the circuit connecting the sensor to the ECM Catalytic Converter Monitoring Sensor Signal Circuit: Short to Battery Positive Short to ground in catalytic converter monitoring sensor	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P014100	O2 Heater Electrical Circuit (row 1, sensor 2)	Catalytic Converter Monitoring Sensor Heater Control Circuit (right bank of cylinders) - high resistance Catalytic converter monitoring sensor heating element malfunction	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P01501A	O2 electrical circuit (row 2, sensor 1)	Electrical circuit (left bank of cylinders) - resistance below threshold Low element impedance Heated oxygen sensor malfunction.	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P01501B	O2 electrical circuit (row 2, sensor 1)	Electrical circuit (left bank of cylinders) - resistance above threshold High element impedance Heated oxygen sensor malfunction.	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P015100	Low Voltage in O2 Circuit (row 2, sensor 1)	Heated oxygen sensor (left bank of cylinders): high signal circuit resistance Heated Oxygen Sensor Signal Circuit Short to Ground Heated oxygen sensor malfunction.	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P015200	High voltage in O2 circuit (row 2, sensor 1)	Heated Oxygen Sensor Signal Circuit (left bank of cylinders): short circuit to battery + Heated oxygen sensor malfunction.	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P015300	Slow response of the O2 electrical circuit (row 2, sensor 1)	Heated oxygen sensor (left bank of cylinders): High resistance in the circuit connecting the sensor to the ECM Leak in the exhaust system Heated oxygen sensor malfunction.	Check the exhaust system for leaks. Refer to the guided diagnostic program for this code on the approved diagnostic system.
P015400	No O2 electrical circuit activity (row 2, sensor 1)	Heated oxygen sensor (left bank of cylinders): slow turn on	Check the HO2S and electrical circuits. Refer to the electrical manual. Refer to the guided diagnostic program for this code on the approved diagnostic system.
P015700	Low Voltage in O2 Circuit (row 2, sensor 2)	Catalytic Converter Monitoring Sensor(left bank of cylinders): High resistance in the circuit connecting the sensor to the ECM Short circuit of the electrical circuit of the catalytic converter monitoring sensor to ground Catalytic converter monitoring sensor malfunction	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P015800	High voltage in O2 circuit (row 2, sensor 2)	Catalytic Converter Monitoring Sensor Signal Circuit (left bank of cylinders): short circuit to battery + Catalytic converter monitoring sensor malfunction	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P015900	Slow response of the O2 electrical circuit (row 2, sensor 2)	Catalytic Converter Monitoring Sensor(left bank of cylinders): slow reaction	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P016000	No O2 electrical circuit activity (row 2, sensor 2)	Catalytic Converter Monitoring Sensor(left bank of cylinders): High resistance in the circuit connecting the sensor to the ECM Catalytic Converter Monitoring Sensor Signal Circuit (left bank of cylinders): short circuit to battery + Short to ground in catalytic converter monitoring sensor	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P016100	O2 Heater Electrical Circuit (row 2, sensor 2)	Catalytic Converter Monitoring Sensor Heater Control Circuit (left bank of cylinders) - refusal	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P042000	Catalytic converter system efficiency below threshold (cylinder bank 1)	Catalytic converter failure due to overheating damage caused by misfire and/or lean combustion Catalytic converter failure due to catalyst poisoning caused by increased oil consumption and/or contaminated fuel	Check the condition of the catalytic converter.
P043000	Catalytic converter system efficiency below threshold (cylinder bank 2)	Catalytic converter failure due to overheating damage caused by misfire and/or lean combustion Catalytic converter failure due to catalyst poisoning caused by increased oil consumption and/or contaminated fuel	Check the condition of the catalytic converter.