10680715

1.

Electrical systems consist of a lot of harness and connectors, poor connection of terminals can cause various problems and damge of component.

2.

Perform checking procedure as follows.

(1)

Check damage of harness and terminals : Check terminals for contact resistance, corrosion and deformation.

(2)

Check connecting condition of ECM and component connector : Check terminal seperation, damage of locking device and connecting condition between terminal and wiring.

note

Disconnect the pin which requires checking at male connector and insert it to the terminal at female connector for checking connecting condition. ( after checking, reconnect the pin at correct position. )

3.

Is the problem found?

	▶ Repair the trouble causing part and go to "Verification of Vehicle Repair".
	▶ Go to "Power Circuit Inspection".

1.

Check power circuit voltage

(1)

IG KEY "OFF", ENGINE "OFF".

(2)

Disconnect MAFS connector.

(3)

IG KEY "ON".

(4)

Measure the voltage between IG power terminal of MAFS harness connector and chassis ground.

(5)

Measure the voltage between power terminal of MAFS harness connector and chassis ground.

Specification : 4.8V~5.1V ( Sensor power )

11.5V~13.0V ( IG Power )

(6)

Is the measured voltage within the specification?

▶ Go to "Signal Circuit Inspection".

▶ When output voltage is not detected at IG power terminal :

☞ Repair open in 'SNSR.2 FUSE (10A)' in E/R junction box and related circuit and go to "Verification of Vehicle Repair".

▶ When output voltage is not detected at power terminal :

☞ Repair open between power terminal of MAFS connector and sensor power terminal of ECM connector (CUD-A), and go to "Verification of Vehicle Repair".

1.

Check signal circuit voltage

(1)

IG KEY "OFF", ENGINE "OFF".

(2)

Disconnect MAFS connector.

(3)

IG KEY "ON".

(4)

Measure the voltage between signal terminal of MAFS connector and chassis ground.

Specification : 4.8V~5.1V

(5)

Is the measured resistance within the specification?

	▶ Go to "Ground Circuit Inspection".
	▶ Go to "2. Check open in signal circuit" as follows.

2.

Check open in signal circuit

(1)

IG KEY "OFF", ENGINE "OFF".

(2)

Disconnect MAFS sensor connector and ECM connector.

(3)

Check continuity between siganl terminal of MAFS harness connector and signal terminal of ECM harness connector.

Specification : Continuity ( below 1.0Ω )

(4)

Is the measured resistance within the specification?

	▶ Go to "3. Check short to ground in signal circuit" as follows.
	▶ Repair open in signal circuit and go to "Verification of Vehicle Repair".

3.

Check short to ground in signal circuit

(1)

IG KEY "OFF", ENGINE "OFF".

(2)

Disconnect MAFS sensor connector and ECM connector.

(3)

Check continuity between siganl terminal of MAFS harness connector and chassis ground.

Specification : Discontinuity(Infinite Ω )

(4)

Is the measured resistance within the specification?

	▶ Go to "Ground Circuit Inspection".
	▶ Repair short to ground in signal circuit and go to "Verification of Vehicle Repair".

1.

IG KEY "OFF", ENGINE "OFF".

2.

Disconnect MAFS connector.

3.

IG KEY "ON".

4.

Measure the voltage between power terminal of MAFS harness connector. [ TEST "A" ]

5.

Measure the voltage between power terminal of MAFS harness connector and ground terminal of MAFS harness connector. [ TEST "B" ]

( MAFS power terminal : Check + prove , MAFS ground terminal : Check - prove )

Specification : [TEST "A"] Voltage - [TEST "B"] Voltage = below 200mV

6.

Is the measured voltage within the specification?

▶ Go to "Component Inspection".

▶ When "B" voltage is not detected : Repair open in ground circuit and go to "Verification of Vehicle Repair".

▶ When the voltage difference between "A" and "B" is above 200mV : Eliminate the causes of excessive resistance and go to "Verification of Vehicle Repair".