(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Clear DTCs See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Testing and Inspection/Reading and Clearing
Diagnostic Trouble Codes/U660F Automatic Transaxle System/DTC Check / Clear.
(e) Turn the engine switch off and turn the Techstream off.
(f) Disconnect the Techstream.
(g) Disconnect the cable from the negative (-) battery terminal and wait for 1 minute.
(h) Connect the cable to the negative (-) battery terminal.
(i) Connect the Techstream to the DLC3.
(j) Turn the engine switch on (IG).
(k) Turn the Techstream on.
(l) Select the following menu items: Powertrain / ECT / Trouble Codes.
(m)Read DTCs.
Result:
B -- REPLACE TCM See: Powertrain Management/Transmission Control Systems/Relays and Modules - Transmission and
Drivetrain/Relays and Modules - A/T/Control Module/Service and Repair/U660F Automatic Transaxle/Removal
A -- CHECK FOR INTERMITTENT PROBLEMS See: Accessories and Optional Equipment/Antitheft and Alarm
Systems/Diagrams/Diagnostic Aids/How To Troubleshoot ECU Controlled Systems/How To Proceed With Troubleshooting
Up to 08/2009
2GR-FE ENGINE CONTROL: SFI SYSTEM: P0101: Mass Air Flow Circuit Range / Performance Problem
P0101 - Mass Air Flow Circuit Range / Performance Problem
DESCRIPTION
The mass air flow meter sub-assembly 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 mass air flow meter sub-assembly, 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
mass air flow meter sub-assembly. The voltage level is proportional to the air flow 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 speed and throttle valve position. Fail-safe mode continues until a pass condition is detected.
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