Inspect Fuel Injector Assembly

Go to step 15

READ VALUE OF INTELLIGENT TESTER (COOLANT TEMP)

Connect an intelligent tester to the DLC3. Turn the ignition switch ON and turn the tester ON. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / COOLANT TEMP.

Read the COOLANT TEMP twice, when the engine is both cold and warmed up.

Standard:

With cold engine: Same as ambient air temperature.

With warm engine: Between 80°C and 100°C (176°C and 212° F).

REPLACE ENGINE COOLANT TEMPERATURE SENSOR

READ VALUE OF INTELLIGENT TESTER (MAF)

Connect an intelligent tester to the DLC3. Turn the ignition switch ON and turn the tester ON. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / MAF and COOLANT TEMP.

Allow the engine to idle until the COOLANT TEMP reaches 75°C (167°F) or more.

Read the MAF with the engine in an idling condition and at an engine speed of 2,500 rpm.

Standard:

MAF while engine idling: Between 3.2 g/sec and 4.7 g/sec (shift position: N, A/C: OFF). MAF at engine speed of 2,500 rpm: Between 13.1 g/ sec and 18.9 g/sec (shift position: N, A/C: OFF).

REPLACE MASS AIR FLOW METER

CHECK FUEL PRESSURE

(a) Check the fuel pressure (See page FU-6).

REPAIR OR REPLACE FUEL SYSTEM

CHECK EXHAUST GAS LEAKAGE

No gas leakage.

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REPAIR OR REPLACE EXHAUST SYSTEM

CHECK SPARK AND IGNITION

HINT:

If the spark plugs or ignition system malfunctions, engine misfire may occur. The misfire count can be read using an intelligent tester. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / CYL #1 (to CYL #6).

REPAIR OR REPLACE IGNITION SYSTEM

INSPECT FUEL INJECTOR ASSEMBLY (INJECTION AND VOLUME)

HINT:

If the injectors malfunction, engine misfire may occur. The misfire count can be read using an intelligent tester. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / CYL #1 (to CYL #6).

REPLACE FUEL INJECTOR ASSEMBLY

INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE)

Component Side:

Front View

Front View

A085152E14

(a) Disconnect the A4 or A5 A/F sensor connector.

(b) Measure the resistance between the terminals of the A/F sensor connector.

Standard Resistance

Tester Connections

Specified Conditions

HT (1) - +B (2)

1.8 n to 3.4 n at 20°C (68°F)

HT (1) - AF- (4)

10 kn or higher

(c) Reconnect the A/F sensor connector.

REPLACE AIR FUEL RATIO SENSOR

REPLACE AIR FUEL RATIO SENSOR

INSPECT AIR FUEL RATIO SENSOR HEATER RELAY

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

Don't pay hundreds of dollars to find out what is wrong with your car. This book is dedicated to helping the do it yourself home and independent technician understand and use OBD-II technology to diagnose and repair their own vehicles.

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