Toyota FJ Cruiser (GSJ 10, 15 series). Instruction — part 36

1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM

ES–99

ES

(a) Disconnect the B13 MAF meter connector.
(b) Disconnect the B1 ECM connector.
(c) Check the resistance.

Standard Resistance (Check for open)

Standard Resistance (Check for short)

(d) Reconnect the MAF meter connector.
(e) Reconnect the ECM connector.

NG

OK

4

CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM)

B1

Wire Harness Side:

ECM Connector

B13

Front View

MAF Meter
Connector

VG

E2G

VG

E2G

A116158E03

Tester Connections

Specified Conditions

VG (B13-3) - VG (B1-30)

Below 1

Ω

E2G (B13-2) - E2G (B1-29)

Tester Connections

Specified Conditions

VG (B13-3) or VG (B1-30) - Body ground

10 k

Ω or higher

REPAIR OR REPLACE HARNESS OR
CONNECTOR

REPLACE MASS AIR FLOW METER (See page

ES-409

)

ES–100

1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM

ES

(a) Inspect the EFI NO. 2 fuse.

(1) Remove the EFI NO. 2 fuse from the engine room

relay block.

(2) Check the EFI NO. 2 fuse resistance.

Standard Resistance:

Below 1

Ω

(3) Reinstall the EFI NO. 2 fuse.

(b) Disconnect the B13 MAF meter connector.
(c) Remove the EFI relay from the engine room relay block.
(d) Check the resistance.

Standard Resistance (Check for open)

Standard Resistance (Check for short)

(e) Reconnect the MAF meter connector.
(f)

Reinstall the EFI relay.

NG

OK

(a) Check the resistance.

Standard Resistance

NG

OK

5

CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - EFI RELAY)

1

2

5

3

B13

MAF Meter
Connector

+B

Front View

Wire Harness Side:

Enigne Room R/B:

EFI Relay

EFI No. 2 Fuse

A133474E01

Tester Connections

Specified Conditions

+B (B13-1) - EFI relay (3)

Below 1

Ω

Tester Connections

Specified Conditions

+B (B13-1) or EFI relay (3) - Body ground

10 k

Ω or higher

REPAIR OR REPLACE HARNESS OR
CONNECTOR

CHECK ECM POWER SOURCE CIRCUIT

6

INSPECT ECM (SENSOR GROUND)

ECM Connector

B1

E2G

A115970E17

Tester Connections

Specified Conditions

E2G (B1-29) - Body ground

Below 1

Ω

REPLACE ECM (See page

ES-446

)

1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM

ES–101

ES

(a) Disconnect the B13 MAF meter connector.
(b) Disconnect the B1 ECM connector.
(c) Check the resistance.

Standard Resistance (Check for open)

Standard Resistance (Check for short)

(d) Reconnect the MAF meter connector.
(e) Reconnect the ECM connector.

NG

OK

7

CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM)

B1

Wire Harness Side:

ECM Connector

B13

Front View

MAF Meter
Connector

VG

E2G

VG

E2G

A116158E04

Tester Connections

Specified Conditions

VG (B13-3) - VG (B1-30)

Below 1

Ω

E2G (B13-2) - E2G (B1-29)

Tester Connections

Specified Conditions

VG (B13-3) or VG (B1-30) - Body ground

10 k

Ω or higher

REPAIR OR REPLACE HARNESS OR
CONNECTOR

REPLACE MASS AIR FLOW METER (See page

ES-409

)

ES–102

1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM

ES

DESCRIPTION

Refer to DTC P0100 (See page

ES-90

).

MONITOR DESCRIPTION

The MAF meter is a sensor that measures the amount of air flowing through the throttle valve. The ECM
uses this information to determine the fuel injection time and to provide an appropriate air-fuel ratio. Inside
the MAF meter, there is a heated platinum wire which is exposed to the flow of intake air. By applying a
specific electrical current to the wire, the ECM heats it to a specific temperature. The flow of incoming air
cools both the wire and an internal thermistor, affecting their resistance. To maintain a constant current
value, the ECM varies the voltage applied to these components of the MAF meter. The voltage level is
proportional to the airflow through the sensor, and the ECM uses it to calculate the intake air volume.
The ECM monitors the average engine load value ratio to check the MAF meter for malfunctions. The
average engine load value ratio is obtained by comparing the average engine load calculated from the
MAF meter output to the average engine load estimated from the driving conditions, such as the engine
speed and the throttle opening angle. If the average engine load value ratio is below the threshold value,
the ECM determines that the intake air volume is low, and if the average engine load value ratio is above
the threshold value, the ECM determines that the intake air volume is high.
If this is detected in 2 consecutive driving cycles, the MIL is illuminated and a DTC is set.

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

DTC

P0101

Mass Air Flow Circuit Range / Performance
Problem

DTC No.

DTC Detection Conditions

Trouble Areas

P0101

Conditions (a), (b), (c), (d) and (e) are met (2 trip detection
logic):
(a) Engine running
(b) Engine coolant temperature 70

°C (158°F) or higher

(c) Throttle Position (TP) sensor voltage 0.4 V or more
(d) Average engine load value ratio less than 0.85, or more
than 1.17 (varies with estimated engine load)
Average engine load value ratio = Average engine load based
on MAF meter output / Average engine load estimated from
driving conditions
(e) Average air-fuel ratio less than -20 %, or more than 20 %

•

Mass Air Flow (MAF) meter

•

Air induction system

•

PCV hose connections

Related DTCs

P0101: Mass air flow meter rationality

Required Sensors/Components (Main)

Mass air flow meter

Required Sensors/Components (Related)

Crankshaft Position (CKP) sensor, Engine Coolant Temperature
(ECT) sensor and Throttle Position (TP) sensor

Frequency of Operation

Continuous

Duration

20 seconds or more

MIL Operation

2 driving cycles

Sequence of Operation

None

Monitor runs whenever following DTCs not present

P0115 - P0118 (ECT sensor)
P0120 - P0223, P2135 (TP sensor)
P0125 (Insufficient ECT for closed loop)
P0335 (CKP sensor)
P0340 (CMP sensor)

Throttle position (TP sensor voltage)

0.4 V or more

Engine

Running

Battery voltage

10.5 V or more