DTC P0100 MASS AIR FLOW SENSOR (MAFS); Component Inspection

EF & EC-7081prose procedure

Component Inspection

CG10, CGA3

CAUTION

Never start engine while removing air cleaner.

1
Turn ignition switch "ON".
2
Start engine and warm it up to normal operating temperature.
3
Check voltage between ECM terminal 41 (Mass air flow sensor signal) and ground. (See SEF690Z and voltage table below.)
4
If the voltage is out of specification, disconnect mass air flow sensor harness connector and connect it again. Repeat above check.
5
If NG, remove mass air flow sensor from air duct. Check hot film for damage or dust.

Conditions	Voltage V
Ignition switch "ON" (Engine stopped.)	Less than 1.2
Idle (Engine is warmed-up to normal operating temperature.)	1.0 - 1.7
2,500 rpm (Engine is warmed-up to normal operating temperature.)	1.7 - 2.1
Idle to about 4,000 rpm*	1.0 - 1.7 to Approx. 4.0

Ignition switch "ON" (Engine stopped.)

Voltage VLess than 1.2

Idle (Engine is warmed-up to normal operating temperature.)

Voltage V1.0 - 1.7

2,500 rpm (Engine is warmed-up to normal operating temperature.)

Voltage V1.7 - 2.1

Idle to about 4,000 rpm*

Voltage V1.0 - 1.7 to Approx. 4.0

NOTE

*: Check for linear voltage rise in response to increases to about 4,000 rpm in engine speed.