Toyota Service Blog

Read Value Using Intelligent Tester Fuel Trim

HINT:

Calculate the total fuel trim values to check the characteristic deviation of the mass air flow meter. (a) Connect the intelligent tester to the DLC3. Turn the ignition switch to the ON position. 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 SHORT FT #1 and LONG FT #1 values is between -20 % and 20 %.

Go to step 12

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.

(e) Check the engine speed while operating the Oil Control Valve (OCV) using the tester.

OK

Tester Operation	Specified Condition
OCV OFF	Normal engine speed
OCV ON	Engine idles roughly or stalls (soon after OCV switched from OFF to ON)

Go to step 8

Go to step 8

CHECK PCV HOSE CONNECTIONS

PCV hose is connected correctly and is not damaged.

Go to step 9

CHECK AIR INDUCTION SYSTEM

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

No leakage from air induction system.

Go to step 10

CHECK AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY

(a) Visually check that the air cleaner filter element is not excessively contaminated with dirt or oil. OK:

Air cleaner filter element is not excessively contaminated with dirt or oil.

Go to step 11

7	REPLACE MASS AIR FLOW METER
		nexT>	Go to step 15
8	CHECK AND REPAIR VVT SYSTEM
		NEXT>	Go to step 15
9	REPAIR OR REPLACE PCV HOSE
		nexT>	Go to step 15
10	REPAIR OR REPLACE AIR INDUCTION SYSTEM
		nexT>	Go to step 15
11	REPLACE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY
		NEXT>	Go to step 15
12	CHECK THROTTLE VALVE

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

No deposits around throttle valve and throttle valve moves smoothly.

Go to step 14

REPLACE ECM

NEXT>

Go to step 15

REPAIR OR REPLACE THROTTLE BODY ASSEMBLY

nexT>

Go to step 15

CHECK WHETHER DTC OUTPUT RECURS (DTC P050A AND/OR P050B)

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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 the intelligent tester to the DLC3. Turn the ignition switch to the ON position. Turn the tester on. Clear the DTCs (See page ES-38). Switch the ECM from normal mode to check mode using the tester (See page ES-41). Start the engine to idle for a minute. OK:

Stable fast idling.

Read the DTCs. OK:

No DTC output.

P0560