DTC P0101 Mass Air Flow Circuit Range / Performance Problem: Wiring Diagram

WARNING: This page is about a different car, the 2006 Lexus RX 400h. However, it is still accessible from the selected car via links, so may be relevant.

Refer to DTC P0100 .

HINT:

Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. 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.

CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0101)

Connect the intelligent tester to the DLC3.
Turn the ignition switch ON.
Turn the tester ON.
Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.

Read DTCs.

Result

RESULT CHART

Display (DTC Output)	Proceed to
P0101 and other DTCs	A
P0101	B

HINT:

If any DTCs other than P0101 are output, troubleshoot those DTCs first.

B: REPLACE MASS AIR FLOW METER

A: GO TO DIAGNOSTIC TROUBLE CODE CHART