Toyota Tundra. Manual — part 1337
c. Remove the integration relay from the engine room relay block.
d. Measure the resistance according to the value (s) in the table below.
Standard resistance
STANDARD RESISTANCE SPECIFICATION
Fig. 53: Identifying HO2 Sensor & Integration Relay Connector Terminals
NG : REPAIR OR REPLACE HARNESS OR CONNECTOR
OK : CHECK ECM POWER SOURCE CIRCUIT (See ECM POWER SOURCE CIRCUIT )
5. CHECK HARNESS AND CONNECTOR (HO2 SENSOR - ECM)
a. Disconnect the D31 or D32 HO2 sensor connector.
Tester Connection
Condition Specified Condition
D31-2 (+B) - 1B-4
Always
Below 1 ohms
D32-2 (+B) - 1B-4
Always
Below 1 ohms
D31-2 (+B) or 1B-4-Body ground Always
10 kohms or higher
D32-2 (+B) or 1B-4-Body ground Always
10 kohms or higher
2008 Toyota Tundra
2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra
b. Disconnect the D74 ECM connector.
c. Measure the resistance according to the value (s) in the table below.
Standard resistance
STANDARD RESISTANCE SPECIFICATION
Fig. 54: Identifying HO2 Sensor & ECM Connector Terminals
NG : REPAIR OR REPLACE HARNESS OR CONNECTOR
OK : Go To Next Step
6. CHECK WHETHER DTC OUTPUT RECURS
a. Connect the Techstream to the DLC3.
Tester Connection
Condition Specified Condition
D31-1 (HT1B) - D74-45 (HT1B)
Always
Below 1 ohms
D32-1 (HT2B) - D74-44 (HT2B)
Always
Below 1 ohms
D31-1 (HT1B) or D74-45 (HT1B) - Body ground Always
10 kohms or higher
D32-1 (HT2B) or D74-44 (HT2B) - Body ground Always
10 kohms or higher
2008 Toyota Tundra
2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra
b. Turn the ignition switch to ON.
c. Turn the Techstream ON.
d. Clear DTCs. (See DTC CHECK/CLEAR ).
e. Start the engine.
f. Allow the engine to idle for 2 minutes or more.
g. Enter the following menus: Powertrain/Engine and ECT/Trouble Codes.
h. Read DTCs.
Result
RESULT REFERENCE
B : REPLACE ECM (See REMOVAL )
A : CHECK FOR INTERMITTENT PROBLEMS (See CHECK FOR INTERMITTENT
PROBLEMS )
DTC P0101 MASS AIR FLOW CIRCUIT RANGE/PERFORMANCE PROBLEM
DESCRIPTION
Refer to DTC P0102 .
DTC DETECTION CONDITION AND TROUBLE AREA
MONITOR DESCRIPTION
Result
Proceed To
No DTC is output
A
P0037, P0038, P0057, P0058, P0141 and/or P0161 are output
B
DTC
Code
DTC Detection Condition
Trouble Area
P0101
Conditions (a), (b), (c), (d) and (e) continue for more than 10 seconds (2
trip detection logic):
a. Engine running
b. Engine coolant temperature 70°C (158°F) or higher
c. Throttle Position (TP) sensor voltage 0.4 V or higher and 3.6 V or
less
d. Average engine load value ratio less than 0.85, or more than 1.20
(varies with estimated engine load) Average engine load value ratio
= Average engine load based on MAF meter output/Average engine
load estimated from driving conditions
e. Average air-fuel ratio less than -15%, or more than 15%
Mass Air Flow
(MAF) meter
Air induction
system
PCV hose
connections
2008 Toyota Tundra
2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra
The 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 an 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 specific 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 the wire and internal thermistor. The voltage level is proportional to the airflow
through the sensor, and the ECM uses it to calculate the intake air volume. The ECM monitors the average
engine load value ratio to check the MAF meter for malfunctions. The average engine load value ratio is
obtained by comparing the average engine load calculated from the MAF meter output to the average engine
load estimated from the driving conditions, such as the engine speed and the throttle opening angle. If the
average engine load value ratio is below the threshold value, the ECM determines that the intake air volume is
low, and if the average engine load value ratio is above the threshold value, the ECM determines that the intake
air volume is high.
If this is detected in 2 consecutive driving cycles, the MIL is illuminated and a DTC is set.
MONITOR STRATEGY
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
TYPICAL ENABLING CONDITIONS
Related DTCs
P0101: Mass air flow meter rationality
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)
Throttle position (TP sensor voltage)
0.4 V or higher and 3.6 V or less
Engine
Running
Battery voltage
10.5 V or higher
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
2008 Toyota Tundra
2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra
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