Suzuki Grand Vitara JB627. Manual — part 32

1A-77 Engine General Information and Diagnosis:

DTC P0102 / P0103: Mass Air Flow Circuit Low / High Input

S6JB0B1104019

Wiring Diagram
Refer to “DTC P0101: Mass Air Flow Circuit Range / Performance”.

DTC Detecting Condition and Trouble Area

DTC Confirmation Procedure

1) With ignition switch OFF, connect scan tool.
2) Turn ON ignition switch and clear DTC by using scan tool if any.
3) Start engine and run it for 10 sec.
4) Check DTC by using scan tool.

DTC Troubleshooting

DTC detecting condition

Trouble area

DTC P0102: Mass Air Flow Circuit Low Input
Output voltage of MAF sensor is less than 0.3 V for 1 second or longer.
(1 driving cycle detection logic)

• MAF sensor and its circuit
• ECM

DTC P0103: Mass Air Flow Circuit High Input
Output voltage of MAF sensor is more than 0.5 V for 1 second or longer.
(1 driving cycle detection logic)

Step

Action

Yes

No

1

Was “Engine and Emission Control System Check”
performed?

Go to Step 2.

Go to “Engine and
Emission Control
System Check”.

2

MAF sensor and its circuit check
1) Connect scan tool to DLC with ignition switch turned

OFF.

2) Start engine and check MAF value displayed on scan

tool. (Refer to “Scan Tool Data” for normal value.)

Is normal value indicated?

Intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection in Section
00”.

Go to Step 3.

3

MAF sensor power supply voltage check
1) Disconnect connector from MAF sensor with ignition

switch turned OFF.

2) Check for proper terminal connection to MAF sensor and

ECM connectors

3) If connections are OK, turn ignition switch to ON

position.

4) Check that MAF sensor power supply voltage is battery

voltage.

Is it in good condition?

Go to Step 4.

Repair or replace MAF
sensor power supply
circuit.

I6JB01110028-01

Engine General Information and Diagnosis: 1A-78

DTC P0107 / P0108: Manifold Absolute Pressure Sensor Circuit Low / High Input

S6JB0B1104020

Wiring Diagram

4

Wire harness check
1) Turn ignition switch OFF position.
2) Disconnect connector from ECM.
3) Check that MAF sensor circuit is as follows.

• Wiring harness resistance of each MAF sensor signal

circuit and ground circuit is less than 3

Ω.

• Insulation resistance between MAF sensor signal

circuit and vehicle body ground is Infinity.

• Insulation resistance of wire harness is infinity

between MAF sensor signal terminal and each other
terminal at MAF and IAT sensor connector.

• Circuit voltage of each MAF sensor signal circuit and

ground circuit is 0 – 1 V with ignition switch turned
ON.

Are they in good condition?

Go to Step 5.

Repair or replace
defective wire harness.

5

MAF sensor signal check
1) Turn ignition switch OFF position.
2) Connect connectors to MAF sensor and ECM.
3) Check MAF sensor signal voltage referring to “Mass Air

Flow (MAF) and Intake Air Temperature (IAT) Sensor
On-Vehicle Inspection in Section 1C”.

Is each value within specified range?

Substitute a known
good ECM and recheck.

Replace MAF and IAT
sensor.

Step

Action

Yes

No

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1110

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32

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E23

C37

4

1

2

3

GRY/RED

5V

C37-49

C37-68

RED/WHT

GRY/GRN

GRY/RED

GRY/GRN

C37-67

P

S

G

I6JB01110029-02

P: MAP sensor power supply circuit

1. Manifold absolute pressure sensor

4. ECM

S: MAP sensor signal circuit

2. To A/C refrigerant pressure sensor (if equipped with A/C)

G: MAP sensor ground circuit

3. To other sensors

1A-79 Engine General Information and Diagnosis:

DTC Detecting Condition and Trouble Area

DTC Confirmation Procedure

WARNING

!

• When performing a road test, select a place where there is no traffic or possibility of a traffic

accident and very careful during testing to avoid occurrence of an accident.

• Road test should be carried out with 2 persons, a driver and a tester, on a level road.

1) With ignition switch OFF, connect scan tool.
2) Turn ON ignition switch and clear DTC by using scan tool if any.
3) Run engine at idle speed for 1 minute.
4) Check DTC and pending DTC by using scan tool.

DTC Troubleshooting

NOTE
Before this trouble shooting is performed, read the precautions for DTC troubleshooting referring to
“Precautions for DTC Troubleshooting”.

DTC detecting condition

Trouble area

DTC P0107: Manifold Absolute Pressure Sensor Circuit Low Input
Output voltage of MAP sensor is less than 0.1 V for 2.6 seconds or longer.
(1 driving cycle detection logic)

• MAP sensor and its circuit
• ECM

DTC P0108: Manifold Absolute Pressure Sensor Circuit High Input
Output voltage of MAP sensor is more than 4.9 V for 2.6 seconds or
longer.
(1 driving cycle detection logic)

Step

Action

Yes

No

1

Was “Engine and Emission Control System Check”
performed?

Go to Step 2.

Go to “Engine and
Emission Control
System Check”.

2

MAP sensor and its circuit check
1) Connect scan tool to DLC with ignition switch OFF.
2) Turn ignition switch ON.
3) Check intake manifold pressure.

Is it 0 kPa or 126 kPa?

Go to Step 3.

Intermittent trouble. If
OK, substitute a known
good ECM and recheck.

Engine General Information and Diagnosis: 1A-80

3

Wire harness check
1) Turn ignition switch OFF position.
2) Disconnect connectors from MAP sensor and ECM.
3) Check for proper terminal connection to MAP sensor

and ECM connectors.

4) If connections are OK, check that MAP sensor circuit is

as follows.
• Wiring harness resistance of each MAP sensor power

supply, signal and ground circuit is less than 3

Ω.

• Insulation resistance of each MAP sensor power

supply and signal circuit is infinity between MAP
sensor connector and vehicle body ground.

• Insulation resistance of wire harness is infinity

between MAP sensor signal terminal and each other
terminal at MAP sensor connector.

• Circuit voltage of each MAP sensor power supply,

signal and ground circuit is 0 – 1 V with ignition switch
turned ON.

Are they in good condition?

Go to Step 4.

Repair or replace
defective wire harness.

4

Wire harness check
1) Connect connectors to ECM.
2) Turn ignition switch to ON position.
3) Check that MAP sensor power supply voltage is 5 V

between power supply terminal and ground terminal of
MAP sensor connector.

Is it in good condition?

Go to Step 5.

Go to Step 6.

5

MAP sensor check
1) Check MAP sensor, referring to “Manifold Absolute

Pressure (MAP) Sensor Inspection in Section 1C”.

Is it in good condition?

Substitute a known
good ECM and recheck.

Replace MAP sensor.

6

Wire harness check
1) Turn ignition switch OFF position.
2) Disconnect connector from A/C refrigerant pressure

sensor.

3) Turn ignition switch to ON position.
4) Check that MAP sensor power supply voltage is 5 V

between power supply terminal and ground terminal of
MAP sensor connector.

Is it in good condition?

Check A/C refrigerant
pressure sensor and its
circuit.

Substitute a known-
good ECM and recheck.

Step

Action

Yes

No