10472203

1.

Possible DTC: P0100 (Air flow sensor)

Actual value for evaluation: Engine idling, or enine warm at approx.80°C

Set value :

450 ~ 510mg/stroke (without EGR)

280 ~ 360MG/STROKE (without EGR)

＊ CC-CODE

(1)

C001 (Signal below the lower limit- No signal)

A.

Possible causes of trouble :

Short circuit to GND line or Open circuit in wiring

Contact resistance

HFM5 defective

ECU defective (Sensor supply voltage) : DTC P1526 C001

(2)

C002 (Signal above the upper limit)

A.

Possible causes of trouble :

Short circuit to GND line or Open circuit in wiring

HFM5 defective

ECU defective (Sensor supply voltage) : DTC P1526 C002

(3)

C003 (General error)

Sensor operation power (from ECU) error

A.

Possible causes of trouble :

Open circuit in wiring / short circuit

ECU defective ( Sensor supply voltage)

2.

Check the HFM5 supply voltage

Pin 2 - GND / Pin 2 - Pin 3 : 8 ~ 15V

Pin 4 - GND / Pin 4 - Pin 3 : 4.5 ~ 5.5V

3.

If set values are not attained : Ignition off, pull off ECU plug.

Check the following wiring

ECU

Sensor

Pin 97

Pin 89

Pin 88

Pin 2, Pin 4

Pin 5

Pin 3

4.

Measure the signal voltage of sensors if connecting leads are OK.

5.

Measure the voltage of plug pin 5 to pin 3 at idle.

Set value (engine warm) : 1.7 ~ 2.2V

Throttle burst set value : Voltage increases

6.

Replace HFM5 if signal voltage set values are not attained.