Toyota Tundra. Manual — part 1162
TYPICAL ENABLING CONDITIONS
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
TYPICAL MALFUNCTION THRESHOLDS
WIRING DIAGRAM
Refer to DTC P0100 .
CONFIRMATION DRIVING PATTERN
Required Sensors/Components
(Main)
Mass air flow meter
Required Sensors/Components
(Related)
Crankshaft Position (CKP) sensor, Engine Coolant Temperature (ECT)
sensor and Throttle Position (TP) sensor
Frequency of Operation
Continuous
Duration
10 seconds
MIL Operation
2 driving cycles
Sequence of Operation
None
Monitor runs whenever following DTCs not present
P0115 - P0118 (ECT sensor)
P0120 - P0223, P2135 (TP sensor)
P0125 (Insufficient ECT for closed loop)
P0335 (CKP sensor)
P0340 (VVT sensor)
Throttle position (TP sensor voltage)
0.2 to 3.6 V
Time after engine starts
5 seconds
Battery voltage
10.5 V or more
Estimated Load
30 to 100
Engine coolant temperature
70°C (158°F) or more
IAT sensor circuit
OK
ECT sensor circuit
OK
CKP sensor circuit
OK
TP sensor circuit
OK
Canister pressure sensor circuit
OK
EVAP leak detection pump
OK
EVAP vent valve
OK
Both of following conditions 1 and 2
met
-
1. Averaged engine load value ratio
Less than 0.85, or more than 1.17 (varies with estimated engine
load)
2. Averaged air-fuel ratio
Less than -15%, or more than 15%
2008 Toyota Tundra
2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra
HINT:
Performing this confirmation pattern will activate the mass air flow performance monitor.
Fig. 53: Confirmation Driving Pattern
1. Connect the Techstream to the DLC3.
2. Turn the ignition switch ON.
3. Turn the Techstream ON.
4. Clear DTCs (See DTC CHECK/CLEAR ).
5. Start the engine, and warm it up until the engine coolant temperature reaches 70°C (158°F) or higher.
6. Drive the vehicle at approximately 62 mph (100 km/h) for 20 seconds or more.
7. Enter the following menus: Powertrain/Engine and ECT/Trouble Codes/Pending; then check if any DTCs
(any pending DTCs) are set.
INSPECTION PROCEDURE
HINT:
Read freeze frame data using the Techstream. 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, if the air-fuel ratio was lean or rich, and other data
from the time the malfunction occurred.
1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0101)
a. Connect the Techstream to the DLC3.
b. Turn the ignition switch ON.
c. Turn the Techstream ON.
d. Enter the following menus: Powertrain/Engine and ECT/Trouble Codes.
e. Read the DTCs.
2008 Toyota Tundra
2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra
Result
RESULT CHART
HINT:
If any DTCs other than P0101 are output, troubleshoot those DTCs first.
B : GO TO DTC CHART (See DIAGNOSTIC TROUBLE CODE CHART )
A : Go to next step
2. CHECK AIR INDUCTION SYSTEM
a. Check the air induction system for vacuum leakage. (See ON-VEHICLE INSPECTION ).
OK: No leakage from air induction system.
NG : REPAIR OR REPLACE AIR INDUCTION SYSTEM
OK : Go to next step
3. CHECK PCV HOSE CONNECTIONS
OK: PCV hose is connected correctly and is not damaged.
NG : REPAIR OR REPLACE PCV HOSE
OK : REPLACE MASS AIR FLOW METER (See REMOVAL )
DTC P0102 MASS OR VOLUME AIR FLOW CIRCUIT LOW INPUT; DTC P0103 MASS OR
VOLUME AIR FLOW CIRCUIT HIGH INPUT
DESCRIPTION
The Mass Air Flow (MAF) meter is a sensor that measures the amount of air flowing through the throttle valve.
The ECM uses this information to determine the fuel injection time and to provide the appropriate air-fuel ratio.
Inside the MAF meter, there is a heated platinum wire which is exposed to the flow of intake air.
By applying a specific electrical current to the wire, the ECM heats it to a given temperature. The flow of
incoming air cools both the wire and an internal thermistor, affecting their resistance. To maintain a constant
current value, the ECM varies the voltage applied to these components in the MAF meter. The voltage level is
Display (DTC Output) Proceed To
P0101
A
P0101 and other DTCs
B
2008 Toyota Tundra
2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra
proportional to the airflow through the sensor, and the ECM uses it to calculate the intake air volume.
The circuit is constructed so that the platinum hot wire and the temperature sensor create a bridge circuit, and
the power transistor is controlled so that the potentials of A and B remain equal to maintain the predetermined
temperature.
HINT:
When any of these DTCs are set, the ECM enters fail-safe mode. During fail-safe mode, the ignition timing is
calculated by the ECM, according to the engine RPM and throttle valve position. Fail-safe mode continues until
a pass condition is detected.
Fig. 54: Mass Or Volume Air Flow Circuit Diagram
DTC TROUBLE DETECTION CONDITION CHART
HINT:
When any of these DTCs are set, check the air-flow rate by entering the following menus: Powertrain/Engine
and ECT/Data List/All Data/MAF.
DATA LIST
DTC
No.
DTC Detection Condition
Trouble Area
P0102
MAF meter voltage less than 0.2 V for 3 seconds (1 trip
detection logic)
Open or short in MAF meter
circuit
MAF meter
ECM
P0103
MAF meter voltage more than 4.9 V for 3 seconds (1 trip
detection logic)
Open or short in MAF meter
circuit
MAF meter
ECM
Mass Air Flow Rate (g/sec.)
Malfunction
2008 Toyota Tundra
2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra
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