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Suzuki Grand Vitara JB416 / JB420 / JB419. Service manual - part 37

1A-95 Engine General Information and Diagnosis: For Petrol Engine Model

DTC P0113: Intake Air Temperature Sensor Circuit High

S6JB0A1114026

Wiring Diagram
Refer to “DTC P0111: Intake Air Temperature Circuit Range / Performance: For Petrol Engine Model”.

DTC Detecting Condition and Trouble Area

NOTE
When DTC P0108, P0118 and P0533 are indicated together, it is possible that “GRY/GRN” wire circuit is
open.

DTC Confirmation Procedure

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

DTC Troubleshooting

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

IAT short circuit check
1) Turn ON ignition switch.
2) Measure voltage between “LT GRN” wire terminal of

MAF and IAT sensor connector and vehicle body
ground.

Is voltage about 0 V?

Go to Step 6.

“LT GRN” wire is
shorted to other circuit.
If wire is OK, substitute
a known-good ECM and
recheck.

IAT sensor for performance check
1) Check IAT sensor according to “Mass Air Flow (MAF)

and Intake Air Temperature (IAT) Sensor Inspection: For
Petrol Engine Model in Section 1C”.

Is it in good condition?

Substitute a known-
good ECM and recheck.

Replace MAF and IAT
sensor.

Step

Action

Yes

DTC detecting condition

Trouble area

Voltage of IAT sensor output is more than 4.8 V for 0.5 sec
continuously (Low intake air temperature (high voltage / high
resistance))
(1 driving cycle detection logic)

• IAT sensor circuit
• IAT sensor
• ECM

Step

Action

Yes

Was “Engine and Emission Control System Check”
performed?

Go to Step 2.

Go to “Engine and
Emission Control
System Check: For
Petrol Engine Model”.

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

OFF.

2) Turn ON ignition switch.
3) Check intake air temp. displayed on scan tool.

Is –40

C (–40

F) indicated?

Go to Step 3.

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

Engine General Information and Diagnosis: For Petrol Engine Model 1A-96

IAT sensor voltage check
1) Disconnect connector from MAF and IAT sensor with

ignition switch turned OFF.

2) Check for proper connection to MAF and IAT sensor at

“LT GRN” and “GRY/GRN” wire terminals.

3) If OK, then turn ON ignition switch, measure voltage

between “LT GRN” wire terminal of MAF and IAT sensor
connector (1) and vehicle body ground.

Is voltage about 4 – 6 V?

Go to Step 7.

Go to Step 4.

ECM voltage check
1) Turn OFF ignition switch.
2) Remove ECM from its bracket with ECM connectors

connected.

3) Check for proper connection of ECM connector at “C37-

25” terminal.

4) If OK, then turn ON ignition switch, measure voltage

between “C37-25” terminal of ECM connector and
vehicle body ground.

Is voltage about 4 – 6 V?

“LT GRN” wire is open
circuit. If wire and
connection are OK, go
to Step 5.

Go to Step 5.

Wire circuit check
1) Disconnect connectors from ECM with ignition switch

turned OFF.

2) Turn ON ignition switch.
3) Measure voltage between “LT GRN” wire terminal of

MAF and IAT sensor connector and vehicle body
ground.

Is voltage about 0 V?

Go to Step 6.

“LT GRN” wire is
shorted to other circuit.
If wire is OK, substitute
a known-good ECM and
recheck.

Wire circuit check
1) Measure resistance between “C37-25” terminal of ECM

connector and “LT GRN” wire terminal of MAF and IAT
sensor connector with ignition switch turned OFF.

Is resistance below 3

Ω

Go to Step 7.

“LT GRN” wire is high
resistance circuit.

Ground circuit check
1) Connect connectors to ECM.
2) Measure resistance between “GRY/GRN” wire terminal

of MAF and IAT sensor connector and vehicle body
ground with ignition switch turned OFF.

Is resistance below 3

Ω

Go to Step 9.

Go to Step 8.

Step

Action

Yes

I5JB0A110037-02

1A-97 Engine General Information and Diagnosis: For Petrol Engine Model

DTC P0116: Engine Coolant Temperature Circuit Range / Performance

S6JB0A1114027

Wiring Diagram

DTC Detecting Condition and Trouble Area

Ground circuit check
1) Remove ECM from its bracket with ECM connectors

connected.

2) Measure resistance between “C37-57” terminal of ECM

connector and vehicle body ground.

Is resistance below 3

Ω

“GRY/GRN” wire is
open circuit or high
resistance circuit. Poor
“C37-57” connection.

Faulty ECM ground
circuit. If circuit is OK,
substitute a known-
good ECM and recheck.

IAT sensor for performance check
1) Check IAT sensor according to “Mass Air Flow (MAF)

and Intake Air Temperature (IAT) Sensor Inspection: For
Petrol Engine Model in Section 1C”.

Is it in good condition?

Substitute a known-
good ECM and recheck.

Replace MAF and IAT
sensor.

Step

Action

Yes

C37-57

GRY/GRN

C37-24

PPL/YEL

E23

C37

14
29

54 53

15
30

39 38

14
29

54 53

15
30

39 38

I5JB0A110038-01

1. ECT sensor
2. ECM
3. To other sensors

DTC detecting condition

Trouble area

ECT sensor values is less than –10

°C, 14 °F (for M16 engine) or

–5

°C, 23 °F (for J20 engine) while engine is running under more

than specified engine load (more than 1000 rpm) for 2 to 1116
min (depending on ECT at engine start) continuously from
engine start.
(2 driving cycle detecting logic)

• ECT sensor
• ECT sensor circuit
• Thermostat
• ECM

Engine General Information and Diagnosis: For Petrol Engine Model 1A-98

DTC Confirmation Procedure

WARNING

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

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

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

NOTE
Check to make sure that following conditions are satisfied when using this “DTC Confirmation
Procedure”.
• Intake air temperature at engine start: –10

°C (14 °F) to 80 °C (176 °F)

• Intake air temperature: –10

°C (14 °F) to 70 °C (158 °F)

• Altitude (barometric pressure): 2400 m, 8000 ft or less (560 mmHg, 75 kPa or more)

1) With ignition switch turned OFF, connect scan tool.
2) Turn ON ignition switch, clear DTC.
3) Start engine.
4) Drive vehicle at 40 mph (60 km/h) or higher for 20 min. or more.
5) Stop vehicle.
6) Check DTC and pending DTC.

DTC Troubleshooting

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

Step

Action

Yes

Was “Engine and Emission Control System Check”
performed?

Go to Step 2.

Go to “Engine and
Emission Control
System Check: For
Petrol Engine Model”.

DTC check
1) With ignition switch turned OFF, install scan tool to DLC.
2) Turn ON ignition switch and check DTC with scan tool.

Is DTC P0118 displayed?

Go to “DTC P0118:
Engine Coolant
Temperature Circuit
High: For Petrol Engine
Model”.

Go to Step 3.

Engine coolant temp. check
1) Turn ON ignition switch and check engine coolant temp.

displayed on scan tool.

2) Warm up engine to normal operating temp. and check

engine coolant temp. displayed on scan tool.

Does engine coolant temp. vary more than 1

C (1

F) and

rise higher than 70

C (158

F)?

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

Go to Step 4.

Thermostat check

Is there a symptom due to thermostat remaining open (it
takes a long time before vehicle heater becomes effective or
before engine is warmed to normal operating temp., etc.)?

Check thermostat
referring to “Thermostat
Inspection: For Petrol
Engine Model in Section
1F”.

Go to Step 5.

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