Toyota Service Blog

Read Value Of Intelligent Tester Fuel Trim

HINT:

Calculate the total fuel trim values to check the characteristic deviation of the mass air flow meter. (a) Connect an intelligent tester to the DLC3. Turn the ignition switch ON. Turn the tester ON.

Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / SHORT FT #1 and LONG FT #1. Read the values displayed on the tester. Add together the SHORT FT #1 and LONG FT #1 values to obtain the total FUEL TRIM.

Total of the SHORT FT #1 and LONG FT #1 values is between -20 % and 20 %.

Go to step 14

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (PURGE VSV)

Connect the intelligent tester to the DLC3. Turn the ignition switch to ON. Turn the tester ON.

Select the following menu items: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / EVAP VSV. Disconnect the hose (connected to the canister) from the purge VSV. Start the engine.

Using the tester, turn off the purge VSV (EVAP VSV: OFF).

Use your finger to confirm that the purge VSV has no suction.

Purge VSV has no suction.

Using the tester, turn on the purge VSV (EVAP VSV: ON).

Use your finger to confirm that the purge VSV has suction.

Purge VSV has suction.

Go to step 9

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (OPERATE OCV)

(a) Connect the intelligent tester to the DLC3.

(b) Start the engine and turn the tester ON.

(d) Select the following menu items: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / VVT CTRL B1.

Go to step 10

CHECK PCV HOSE CONNECTIONS

PCV hose is connected correctly and is not damaged.

Go to step 11

CHECK AIR INDUCTION SYSTEM

(a) Check the air induction system for vacuum leakage. OK:

No leakage from air induction system.

Go to step 12

7	CHECK AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY
		nexT>	Go to step 13
L^OkJ
8	REPLACE MASS AIR FLOW METER
		NEXT>	Go to step 19
9	REPLACE PURGE VSV
		nexT>	Go to step 19
10	CHECK AND REPAIR VVT SYSTEM
		NEXT>	Go to step 19
11	REPAIR OR REPLACE PCV HOSE
		nexT>	Go to step 19
12	REPAIR OR REPLACE AIR INDUCTION SYSTEM
		nexT>	Go to step 19
13	REPLACE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY
		NEXT>	Go to step 19

READ VALUE OF INTELLIGENT TESTER (ENGINE SPD)

Go to step 17

CHECK THROTTLE VALVE

(a) Check for deposits around the throttle valve and throttle valve condition. OK:

No deposits around the throttle valve and throttle valve moves smoothly

Go to step 18

16	REPLACE ECM
		NEXT>	Go to step 19
17	REPAIR OR REPLACE CRANKSHAFT POSITION SENSOR CIRCUIT
		nexT>	Go to step 19
18	REPAIR OR REPLACE THROTTLE BODY ASSEMBLY
		NEXT>	Go to step 19
19	CHECK WHETHER DTC OUTPUT RECURS (DTC P050A AND/OR P050B)

NOTICE:

In this operation, the engine must be cold (the same level as the engine coolant temperature recorded in the freeze frame data).

(a) Connect an intelligent tester to the DLC3.

(b) Turn the ignition switch to ON.

(e) Switch the ECM from normal mode to check mode using the tester (See page ES-41).

(f) Start the engine to idle for a minute. OK:

Stable fast idling.