Suzuki Grand Vitara JB416 / JB420 / JB419. Manual - part 38

1A-99 Engine General Information and Diagnosis: For Petrol Engine Model

5

Wire harness check
1) Disconnect ECT sensor connector with ignition switch 

turned OFF.

2) Check for proper connection to ECT sensor connector at 

“PPL/YEL” and “GRY/GRN” wire terminals.

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

between “PPL/YEL” wire terminal of ECT sensor 
connector and vehicle body ground.

Is voltage about 4 – 6 V?

Go to Step 9.

Go to Step 6.

6

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-

24” terminal.

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

between “C37-24” terminal of ECM connector and 
vehicle body ground.

Is voltage about 4 – 6 V?

“PPL/YEL” wire is open 
circuit.
If wire and connection 
are OK, go to Step 7.

Go to Step 7.

7

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

turned OFF.

2) Turn ignition switch to ON position.
3) Measure voltage between “PPL/YEL” wire terminal of 

ECT sensor connector and body ground.

Is voltage about 0 V?

Go to Step 8.

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

8

Wire circuit check
1) Measure resistance between “C37-24” terminal of ECM 

connector and “PPL/YEL” wire terminal of ECT sensor 
connector with ignition switch turned OFF.

Is resistance below 3 

Ω

?

Go to Step 9.

“PPL/YEL” wire is high 
resistance circuit.

9

Ground circuit check
1) Connect connectors to ECM.
2) Check for proper connection of ECT sensor connector at 

“GRY/GRN” wire terminal.

3) Measure resistance between “GRY/GRN” wire terminal 

of ECT sensor connector and vehicle body ground.

Is resistance below 3 

Ω

?

Go to Step 11.

Go to Step 10.

Step

Action

Yes

No

I5JB0A110039-01

Engine General Information and Diagnosis: For Petrol Engine Model 1A-100

DTC P0117: Engine Coolant Temperature Circuit Low

S6JB0A1114028

Wiring Diagram
Refer to “DTC P0116: Engine Coolant Temperature Circuit Range / Performance: For Petrol Engine Model”.

DTC Detecting Condition and Trouble Area

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. or more.
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”.

 

10 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 high 
resistance circuit.
Poor “C37-57” 
connection.

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

11 ECT sensor check

1) Check ECT sensor according to “Engine Coolant 

Temperature (ECT) Sensor Inspection: For Petrol 
Engine Model in Section 1C”.

Is it in good condition?

Substitute a known-
good ECM and recheck.

Replace ECT sensor.

Step

Action

Yes

No

DTC detecting condition

Trouble area

Voltage of ECT sensor output is less than 0.2 V for 0.5 sec 
continuously
(High engine coolant temperature (low voltage / low resistance))
(1 driving cycle detection logic)

• ECT sensor circuit
• ECT sensor
• ECM

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: For 
Petrol Engine Model”.

2

ECT sensor and its circuit check
1) Connect scan tool with ignition switch turned OFF.
2) Turn ON ignition switch.
3) Check engine coolant temp. displayed on scan tool.

Is 130 

°

C (266 

°

F) indicated?

Go to Step 3.

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

1A-101 Engine General Information and Diagnosis: For Petrol Engine Model

3

ECM voltage check
1) Disconnect connector from ECT sensor with ignition 

switch turned OFF.

2) Check for proper connection to ECT sensor at “PPL/

YEL” and “GRY/GRN” wire terminals.

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

between “PPL/YEL” wire terminal of ECT sensor 
connector and vehicle body ground.

Is voltage about 4 – 6 V?

Go to Step 6.

Go to Step 4.

4

ECT sensor short circuit check
1) Disconnect connectors from ECM with ignition switch 

turned OFF.

2) Measure resistance between “PPL/YEL” wire terminal of 

ECT sensor connector and vehicle body ground.

Is resistance infinity?

Go to Step 5.

“PPL/YEL” wire is 
shorted to ground 
circuit.
If wire is OK, substitute 
a known-good ECM and 
recheck.

5

ECT sensor short circuit check
1) Turn ON ignition switch.
2) Measure voltage between “PPL/YEL” wire terminal of 

ECT sensor connector and vehicle body ground.

Is voltage about 0 V?

Go to Step 6.

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

6

ECT sensor for performance check
1) Check ECT sensor according to “Engine Coolant 

Temperature (ECT) Sensor Inspection: For Petrol 
Engine Model in Section 1C”.

Is it in good condition?

Substitute a known-
good ECM and recheck.

Replace ECT sensor.

Step

Action

Yes

No

I5JB0A110040-01

Engine General Information and Diagnosis: For Petrol Engine Model 1A-102

DTC P0118: Engine Coolant Temperature Circuit High

S6JB0A1114029

Wiring Diagram
Refer to “DTC P0116: Engine Coolant Temperature Circuit Range / Performance: For Petrol Engine Model”.

DTC Detecting Condition and Trouble Area

NOTE
When DTC P0108, P0113 and P0533 are indicated together, it is possible that “GRY/GRN” wire circuit 
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. or more.
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”.

 

DTC detecting condition

Trouble area

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

• ECT sensor circuit
• ECT sensor
• ECM

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: For 
Petrol Engine Model”.

2

ECT sensor and its circuit check
1) Connect scan tool with ignition switch turned OFF.
2) Turn ON ignition switch.
3) Check engine coolant 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”.

3

ECT voltage check
1) Disconnect connector from ECT sensor with ignition 

switch turned OFF.

2) Check for proper connection to ECT sensor at “PPL/

YEL” and “GRY/GRN” wire terminals.

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

between “PPL/YEL” wire terminal of ECT sensor 
connector and vehicle body ground.

Is voltage about 4 – 6 V?

Go to Step 6.

Go to Step 4.

I5JB0A110040-01