Toyota Tundra (2015 year). Manual — part 1908
DTC
NO.
DTC DETECTION CONDITION
TROUBLE AREA
P015A
The "Rich to Lean delay level*" value is less than the
standard.
(2 trip detection logic)
Air fuel ratio sensor (for bank 1
sensor 1)
Air fuel ratio sensor (for bank 1
sensor 1) heater
ECM
P015B
The "Lean to Rich delay level*" value is more than the
standard.
(2 trip detection logic)
P015C
The "Rich to Lean delay level*" value is less than the
standard.
(2 trip detection logic)
Air fuel ratio sensor (for bank 2
sensor 1)
Air fuel ratio sensor (for bank 2
sensor 1) heater
ECM
P015D
The "Lean to Rich delay level*" value is more than the
standard.
(2 trip detection logic)
*: Calculated by the ECM based on the air fuel ratio sensor output
MONITOR DESCRIPTION
After the engine is warm, the ECM carries out air-fuel ratio feedback control, and maintains the air-fuel ratio
at the stoichiometric level. In addition, after all the preconditions have been met, active air-fuel ratio control
is carried out for approx. 10 seconds, and during active air-fuel ratio control, the ECM measures the response
If the time it takes the air fuel ratio sensor output to change is delayed, DTC P015A, P015B, P015C and P015D
are stored.
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P014C-P014F...
MONITOR STRATEGY
Related DTCs
P014C: Air fuel ratio sensor (bank 1) slow response (rich to lean)
P014D: Air fuel ratio sensor (bank 1) slow response (lean to rich)
P014E: Air fuel ratio sensor (bank 2) slow response (rich to lean)
P014F: Air fuel ratio sensor (bank 2) slow response (lean to rich)
P015A: Air fuel ratio sensor (bank 1) delayed response (rich to
lean)
P015B: Air fuel ratio sensor (bank 1) delayed response (lean to
rich)
P015C: Air fuel ratio sensor (bank 2) delayed response (rich to
lean)
P015D: Air fuel ratio sensor (bank 2) delayed response (lean to
rich)
Required Sensors/Components (Main)
Air fuel ratio sensor
Required Sensors/Components
(Related)
Vehicle speed sensor, crankshaft position sensor
Duration
10 to 15 seconds
MIL Operation
2 driving cycles
TYPICAL ENABLING CONDITIONS
Monitor runs whenever following DTCs not stored
None
Active air fuel ratio control
Performing
Active air fuel ratio control is performed when the following conditions met
-
Battery voltage
11 V or higher
Engine coolant temperature
75°C (167°F) or higher
Idle
OFF
Engine speed
1000 to 2500 rpm
Air fuel ratio sensor status
Activated
Fuel-cut
OFF
Engine load
10 to 70%
Shift position
2nd or higher
Catalyst monitor
Not executed
Mass air flow
4.0 to 11.4 gm/sec
TYPICAL MALFUNCTION THRESHOLDS
Air Fuel Ratio Sensor Slow Response (Rich to Lean)
Rich to Lean response rate deterioration level
0.03 V or less
Air Fuel Ratio Sensor Slow Response (Lean to Rich)
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P014C-P014F...
Lean to Rich response rate deterioration level
-0.035 V or higher
Air Fuel Ratio Sensor Delayed Response (Rich to Lean)
Rich to Lean delay level
350 ms or more
Air Fuel Ratio Sensor Delayed Response (Lean to Rich)
Lean to Rich delay level
350 ms or more
MONITOR RESULT
Refer to Checking Monitor Status
.
CONFIRMATION DRIVING PATTERN
HINT:
Performing this confirmation driving pattern will activate the air fuel ratio sensor response monitor.
Connect the Techstream to the DLC3.
1.
Turn the ignition switch to ON.
2.
Turn the Techstream on.
3.
Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).
4.
Turn the ignition switch off and wait for at least 30 seconds.
5.
Turn the ignition switch to ON and turn the Techstream on.
6.
Enter the following menus: Powertrain / Engine and ECT / Monitor / O2 Sensor.
7.
Check that the monitor item O2 Sensor is Incomplete.
HINT:
The test values for the test items RL RES RATE B1S1, LR RES RATE B1S1, RL DELAY B1S1,
Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher
[A].
9.
10.
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P014C-P014F...
Check that the monitor item O2 Sensor becomes Complete.
HINT:
Check the test values on the Techstream by entering the following menus: Powertrain /
Engine and ECT / Monitor / O2 Sensor /Details / RL RES RATE B1S1, LR RES RATE B1S1, RL
DELAY B1S1, LR DELAY B1S1, RL RES RATE B2S1, LR RES RATE B2S1, RL DELAY B2S1 and
LR DELAY B2S1.
11.
If the monitor item O2 Sensor does not become Complete (if the test values indicated on the
Techstream do not change), perform Readiness Monitor Drive Pattern for the air fuel ratio sensor
and heated oxygen sensor
.
12.
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [C].
13.
Read the pending DTCs.
HINT:
If a pending DTC is output, the system is malfunctioning.
If a pending DTC is not output, perform the following procedure.
14.
Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
15.
Input the DTC: P014C, P014D, P014E, P014F, P015A, P015B, P015C or P015D.
16.
Check the DTC judgment result.
TESTER
DISPLAY
DESCRIPTION
NORMAL
DTC judgment completed
System normal
ABNORMAL
DTC judgment completed
System abnormal
INCOMPLETE
DTC judgment not completed
Perform driving pattern after confirming DTC enabling conditions
N/A
Unable to perform DTC judgment
HINT:
If the judgment result shows ABNORMAL, the system has a malfunction.
17.
If the test result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and
check for permanent DTCs
.
HINT:
If a permanent DTC is output, the system is malfunctioning.
If no permanent DTC is output, the system is normal.
18.
WIRING DIAGRAM
Refer to DTC P2195
.
INSPECTION PROCEDURE
HINT:
A low air fuel ratio sensor voltage could be caused by a rich air fuel mixture. Check for conditions that
would cause the engine to run rich.
A high air fuel ratio sensor voltage could be caused by a lean air fuel mixture. Check for conditions that
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P014C-P014F...
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