Inspection Procedure

Total OBD & ECU Auto Diagnostics

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HINT:

Read freeze frame data using the intelligent tester. 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.

READ VALUE USING INTELLIGENT TESTER (MASS AIR FLOW RATE)

Result

(a) Connect the intelligent tester to the DLC3.

(b) Start the engine.

(d) Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / MAF.

(e) Read the values displayed on the tester.

Result

Mass Air Flow Rate (g/sec.)

Proceed To

0.0

A

271.0 or more

B

Between 1.0 and 270.0 (*1)

*1: The value must change when the throttle valve is open or closed with the engine running.

Go to step 6

CHECK FOR INTERMITTENT PROBLEMS

INSPECT MASS AIR FLOW METER (POWER SOURCE VOLTAGE)

(a) Disconnect the B1 Mass Air Flow (MAF) meter connector.

(b) Turn the ignition switch ON.

(c) Measure the voltage between the terminal of the wire harness side connector and body ground. Standard voltage

Tester Connections

Specified Conditions

B1-3 (+B) - Body ground

9 to 14 V

(d) Reconnect the MAF meter connector.

Go to step 5

Go to step 5

INSPECT MASS AIR FLOW METER (VG VOLTAGE)

Rod Custom Cable Wipers

(a) Output voltage inspection.

(1) Apply battery voltage across terminals +B and E2G.

(2) Connect the positive (+) tester probe to terminal VG, and negative (-) tester probe to terminal E2G.

(3) Measure the voltage. Standard voltage

Tester Connections

Specified Conditions

5 (VG) - 4 (E2G)

0.2 to 4.9 V

REPLACE MASS AIR FLOW METER

REPLACE MASS AIR FLOW METER

CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM)

Wire Harness Side:

MAF Meter Connector

MAF Meter Connector

ECM Connector

fr

1 II

(a) Disconnect the B1 MAF meter connector.

(b) Disconnect the B30 ECM connector.

(c) Measure the resistance.

Standard resistance (Check for open)

(d) Reconnect the MAF meter connector.

(e) Reconnect the ECM connector.

REPAIR OR REPLACE HARNESS OR CONNECTOR

Tester Connections

Specified Conditions

B1-5 (VG) - B30-118 (VG)

Below 1 Q

B1-4 (E2G) - B30-116 (E2G)

Below 1 Q

Standard resistance (Check for short)

Tester Connections

Specified Conditions

B1-5 (VG) or B30-118 (VG) - Body ground

10 kQ or higher

REPLACE ECM

CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - INTEGRATION RELAY)

Wire Harness Side:

MAF Meter Connector

Integration Relay

Integration Relay dA)

kEFI No. 1

Engine Room No. 1 Relay Block

A127960E01

(b) Disconnect the B1 MAF meter connector.

(c) Remove the integration relay from the engine room No. 1 relay block.

(d) Check the resistance.

Standard resistance (Check for open)

Tester Connections

Specified Conditions

B1-3 (+B) - 1A-4

Below 1 Q

Standard resistance (Check for short)

Tester Connections

Specified Conditions

B1-3 (+B) or 1A-4 - Body ground

10 kQ or higher

(e) Reconnect the MAF meter connector.

(f) Reinstall the integration relay.

REPAIR OR REPLACE HARNESS OR CONNECTOR

CHECK ECM POWER SOURCE CIRCUIT

CHECK HARNESS AND CONNECTOR (SENSOR GROUND)

Conector Sensor Maf Yaris 2001

(a) Disconnect the B1 MAF meter connector.

(b) Measure the resistance. Standard resistance

Tester Connections

Specified Conditions

B1-4 (E2G) - Body ground

Below 1 Q

REPLACE MASS AIR FLOW METER

REPLACE MASS AIR FLOW METER

CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM)

Wire Harness Side:

MAF Meter Connector

MAF Meter Connector

(83^ ECM Connector

1 II

A127959E01

(a) Disconnect the B1 MAF meter connector.

(b) Disconnect the B30 ECM connector.

(c) Measure the resistance.

Standard resistance (Check for open)

(d) Reconnect the MAF meter connector.

(e) Reconnect the ECM connector.

REPAIR OR REPLACE HARNESS OR CONNECTOR

Tester Connections

Specified Conditions

B1-5 (VG) - B30-11S (VG)

Below 1 Q

B1-4 (E2G) - B30-11B (E2G)

Below 1 Q

Standard resistance (Check for short)

Tester Connections

Specified Conditions

B1-5 (VG) or B30-118 (VG) - Body ground

10 kQ or higher

REPLACE ECM

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