DESCRIPTION
HINT:
Refer to DTC P2195 (See page ).
DTC No. |
DTC Detection Condition |
Trouble Area |
---|---|---|
P014C |
The "Rich to Lean response rate deterioration level*" value is standard or less (2 trip detection logic). |
|
P014D |
The "Lean to Rich response rate deterioration level*" value is standard or more (2 trip detection logic). |
|
P015A |
The "Rich to Lean delay level*" value is standard or more (2 trip detection logic). |
|
P015B |
The "Lean to Rich delay level*" value is standard or more (2 trip detection logic). |
*: Calculated by ECM based on the air fuel ratio sensor output.
MONITOR DESCRIPTION
After the engine has been warmed up, the ECM carries out air fuel ratio feedback control, and maintains the air fuel ratio at the theoretical level. In addition, after all the preconditions have been met, active air fuel ratio control is carried out for approximately 10 seconds and during active air fuel ratio control, the ECM measures the response of the air fuel ratio sensor by increasing or decreasing a specific injection quantity based on the theoretical air fuel ratio learned during normal air fuel control. The ECM determines whether there is an air fuel ratio sensor malfunction at the mid-point of active air fuel ratio control.
If the air fuel ratio sensor's response ability is reduced, DTC P014C and P014D are output.
If the air fuel ratio sensor output timing is delayed, DTC P015A and P015B are output.
MONITOR STRATEGY
Related DTCs |
P014C: Air fuel ratio sensor (sensor 1) response rate (rich to lean response rate) P014D: Air fuel ratio sensor (sensor 1) response rate (lean to rich response rate) P015A: Air fuel ratio sensor (sensor 1) response rate (rich to lean delay) P015B: Air fuel ratio sensor (sensor 1) response rate (lean to rich delay) |
Required Sensors/Components (Main) |
Air fuel ratio sensor |
Required Sensors/Components (Related) |
Vehicle speed sensor Crankshaft position sensor |
Frequency of Operation |
Once per driving cycle |
Duration |
10 to 15 seconds |
MIL Operation |
2 driving cycles |
Sequence of Operation |
None |
TYPICAL ENABLING CONDITIONS
Monitor runs whenever the following DTCs are not stored |
None |
Active air fuel ratio control |
Performing |
Active air fuel ratio control is performed when the following conditions are met |
- |
Battery voltage |
11 V or higher |
Engine coolant temperature |
75°C (167°F) or higher |
Idle |
Off |
Engine speed |
1200 rpm or higher, and less than 2500 rpm |
Air fuel ratio sensor status |
Activated |
Fuel-cut |
Off |
Engine load |
10% or higher, and less than 70% |
Shift position |
2nd or more |
Catalyst monitor |
Not yet |
Mass air flow |
4 gm/sec or more, and less than 16 gm/sec |
TYPICAL MALFUNCTION THRESHOLDS
P014C: Air Fuel Ratio Sensor (Bank 1) Response Rate (Rich to Lean Response Rate)
Rich to Lean Response rate deterioration level |
0.032 V or less |
Lean to Rich Response rate deterioration level |
-0.0401 V or higher |
Rich to Lean delay level |
376.832 ms or more |
Lean to Rich delay level |
376.832 ms or more |
MONITOR RESULT
Refer to Checking Monitor Status (See page
).
CONFIRMATION DRIVING PATTERN
HINT:
Performing this confirmation pattern will activate the air fuel ratio sensor response monitor.
HINT:
The test values for the test items RL RES RATE B1S1, LR RES RATE B1S1, RL DELAY B1S1 and LR DELAY B1S1 do not exist in the Detail of O2 Sensor monitor at this time (the initial value of "0.000" is indicated in each test item).
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
HINT:
Check the test values on the Techstream by entering the following menus: Powertrain / Engine / Monitor / Current Monitor / O2 Sensor / Details / RL RES RATE B1S1, LR RES RATE B1S1, RL DELAY B1S1 and LR DELAY B1S1.
HINT:
Techstream Display |
Description |
---|---|
NORMAL |
|
ABNORMAL |
|
INCOMPLETE |
|
N/A |
|
HINT:
HINT:
WIRING DIAGRAM
Refer to DTC P2195 (See page ).
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
HINT:
PROCEDURE
1. |
CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P014C, P014D, P015A OR P015B) |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine / Trouble Codes.
(e) Read the DTCs.
Result
Result |
Proceed to |
---|---|
DTC P014C, P014D, P015A or P015B is output |
A |
DTC P014C, P014D, P015A or P015B and other DTCs are output |
B |
HINT:
If any DTCs other than P014C, P014D, P015A or P015B are output, troubleshoot those DTCs first.
B | ![]() |
GO TO DTC CHART |
|
2. |
INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE) |
NG | ![]() |
REPLACE AIR FUEL RATIO SENSOR |
|
3. |
CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR - ECM) |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
4. |
INSPECT AIR FUEL RATIO SENSOR |
(a) Check that the proper air fuel ratio sensors are installed to the vehicle.
HINT:
Perform "Inspection After Repair" after replacing the air fuel ratio sensor (See
page ).
NG | ![]() |
REPLACE AIR FUEL RATIO SENSOR |
|
5. |
PERFORM CONFIRMATION DRIVING PATTERN |
(a) Drive the vehicle according to the Confirmation Driving Pattern.
|
6. |
CHECK WHETHER DTC OUTPUT RECURS (DTC P014C, P014D, P015A OR P015B) |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.
(e) Read the pending DTCs.
Result
Result |
Proceed to |
---|---|
DTC P014C, P014D, P015A or P015B are output |
A |
DTC is not output |
B |
B | ![]() |
CHECK FOR INTERMITTENT PROBLEMS |
|
7. |
REPLACE AIR FUEL RATIO SENSOR |
(a) Replace the air fuel ratio sensor (See page
).
HINT:
Perform "Inspection After Repair" after replacing the air fuel ratio sensor (See
page ).
|
8. |
PERFORM CONFIRMATION DRIVING PATTERN |
(a) Drive the vehicle according to the Confirmation Driving Pattern.
|
9. |
CHECK WHETHER DTC OUTPUT RECURS (DTC P014C, P014D, P015A OR P015B) |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.
(e) Read the pending DTCs.
Result
Result |
Proceed to |
---|---|
DTC is not output |
A |
DTC P014C, P014D, P015A or P015B are output |
B |
A | ![]() |
END |
B | ![]() |
CHECK ENGINE TO DETERMINE CAUSE OF EXTREMELY RICH OR LEAN ACTUAL AIR FUEL RATIO |
Motor Circuit Malfunction (C1521,C1531-C1534,C1554)
DESCRIPTION
If the power steering ECU detects these DTCs, it will shut off the motor relay
circuit (built into the power steering ECU) and stop power assist. However, power
assist continues if DTC C1533 or C1534 is stored.
DTC No.
D ...
HL AutoLeveling ECU Failure (B2420)
DESCRIPTION
When the headlight leveling ECU assembly detects a malfunction in itself, this
DTC is stored.
DTC No.
DTC Detecting Condition
Trouble Area
B2420
Malfunction of headlight leveling ECU ...
Transmitter ID not Registered (C2171/71)
DESCRIPTION
Each tire pressure warning valve and transmitter ID is registered to the tire
pressure warning ECU.
When the ECU detects a transmitter ID code not registered in the ECU, a DTC is
output.
DTC No.
DTC Detection Condition
...