ECD SYSTEM(w/o Glow Plug Controller), Diagnostic DTC:P0131,P0132 and P0134
| DTC Code | DTC Name |
|---|---|
| P0131 | Oxygen Sensor Circuit Low Voltage (Bank 1 Sensor 1) |
| P0132 | Oxygen Sensor Circuit High Voltage Bank1 Sensor1 |
| P0134 | Oxygen Sensor Circuit No Activity Detected (Bank 1 Sensor 1) |
DESCRIPTION
In order to obtain high purification rates for carbon monoxide (CO) and hydrocarbons (HC) and a high collection/oxidization rate for particulate matter (PM) in the exhaust gas, a CCo + DPF catalytic converter is used. The air fuel ratio sensor is used to compensate for variations in the EGR rate to reduce PM accumulation in the DPF catalytic converter.
The A/F sensor provides an output voltage that is proportional to the air-fuel ratio that it is measuring. The A/F sensor output voltage is used as feedback for the ECM to control the A/F mixture. The inner surface of the air fuel ratio sensor element is exposed to outside air. The outer surface of the sensor element is exposed to exhaust gases. The sensor element is made of platinum coated zirconia and includes an integrated heating element. The zirconia element generates a small voltage when there is a large difference in the oxygen concentrations of the exhaust and the outside air. The platinum coating amplifies voltage generation. When heated, the sensor becomes very efficient. If the temperature of the exhaust is low, the sensor will not generate useful voltage signals without supplemental heating. The ECM regulates the supplemental heating by using a duty-cycle approach to regulate the average current in the heater element.
Although the DTC titles say oxygen sensor, these DTCs relate to the air fuel ratio sensor.
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
MIL |
Memory |
|---|---|---|---|---|---|
P0131 |
Oxygen Sensor Circuit Low Voltage (Bank 1 Sensor 1) |
Short in air fuel ratio sensor circuit (2 trip detection logic) |
|
Comes on |
DTC stored |
P0132 |
Oxygen Sensor Circuit High Voltage Bank1 Sensor1 |
Short in air fuel ratio sensor circuit (2 trip detection logic) |
|
Comes on |
DTC stored |
P0134 |
Oxygen Sensor Circuit No Activity Detected (Bank 1 Sensor 1) |
Open in wire harness of air fuel ratio sensor circuit (2 trip detection logic) |
|
Comes on |
DTC stored |
DTC No. |
DTC Detection Drive Pattern |
|---|---|
P0131 |
Vehicle driving with warm engine |
P0132 |
|
P0134 |
Idling with warm engine |
WIRING DIAGRAM
CAUTION / NOTICE / HINT
When replacing the ECM and/or air fuel ratio sensor, perform ECM Initialization and Registration.
Inspect the fuses for circuits related to this system before performing the following procedure.
When the ECM must be replaced, before replacing the ECM, perform the "Learning Values Save" function using the GTS. Then after installing a new ECM, perform all of the initialization and registration procedures for the "Learning Values Write" function by following the instructions shown on the GTS display.
Read freeze frame data using the GTS. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, and other data from the time the malfunction occurred.
PROCEDURE
CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR - ECM)
Disconnect the air fuel ratio sensor connector.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection
Condition
Specified Condition
B120-4 (AF1+) - A101-69 (AF1+)
Always
Below 1 Ω
B120-6 (TR) - A101-68 (TR)
Always
Below 1 Ω
B120-1 (AF1-) - A101-70 (AF1-)
Always
Below 1 Ω
B120-3 (RE) - A101-71 (RE)
Always
Below 1 Ω
B120-4 (AF1+) or A101-69 (AF1+) - Body ground
Always
10 kΩ or higher
B120-6 (TR) or A101-68 (TR) - Body ground
Always
10 kΩ or higher
B120-1 (AF1-) or A101-70 (AF1-) - Body ground
Always
10 kΩ or higher
B120-3 (RE) or A101-71 (RE) - Body ground
Always
10 kΩ or higher
Result
Proceed to
OK
NG
NG REPAIR OR REPLACE HARNESS OR CONNECTORClick here
REPLACE AIR FUEL RATIO SENSOR
Replace the air fuel ratio sensor.
Perform A/F Sensor Compensation Reset.
Result
Proceed to
NEXT
CHECK WHETHER DTC OUTPUT RECURS (DTC P0131, P0132 OR P0134)
Connect the GTS to the DLC3.
Turn the ignition switch to ON and turn the GTS on.
Clear the DTCs.
Powertrain > Engine and ECT > Clear DTCs
Start the engine and allow it to idle until the engine coolant temperature reaches at 70°C (158°F) or higher.
Allow the engine to idle for 5 minutes or more.
Drive the vehicle with a stop-and-go city drive pattern for more than 15 minutes.
CAUTION:When performing the confirmation driving pattern, obey all speed limits and traffic laws.
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending.
Read the pending DTCs.
Powertrain > Engine and ECT > Trouble Codes
Result
Result
Proceed to
DTC P0131, P0132 or P0134 is output
A
DTC is not output
B
B END
REPLACE ECM
Replace the ECM.
Result
Proceed to
NEXT
CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED
Connect the GTS to the DLC3.
Turn the ignition switch to ON and turn the GTS on.
Clear the DTCs.
Powertrain > Engine and ECT > Clear DTCs
Start the engine and allow it to idle until the engine coolant temperature reaches at 70°C (158°F) or higher.
Allow the engine to idle for 5 minutes or more.
Drive the vehicle with a stop-and-go city drive pattern for more than 15 minutes.
CAUTION:When performing the confirmation driving pattern, obey all speed limits and traffic laws.
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending.
Confirm that the pending DTC is not output again.
Powertrain > Engine and ECT > Trouble Codes
Result
Proceed to
NEXT
NEXT END
REPAIR OR REPLACE HARNESS OR CONNECTOR
Result
Proceed to
NEXT
NEXT CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here