Suzuki Grand Vitara JB627. Manual - part 48

1A-141 Engine General Information and Diagnosis: 

DTC Troubleshooting

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

 

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

A/C compressor relay signal check
1) Connect scan tool to DLC with ignition switch turned 

OFF.

2) Start engine and then operate A/C system.
3) Check A/C compressor relay control signal of “A/C 

Comp Relay” under “Data List” displayed on scan tool.
• A/C switch is at ON position and blower selector is 

other than OFF position: “ON”.

• A/C switch is at OFF position and blower selector is at 

OFF position: “OFF”.

Does “A/C Comp Relay” signal correctly?

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

Go to Step 3.

3

A/C compressor relay control signal check
1) Disconnect connectors from ECM with ignition switch 

turned OFF.

2) Check that A/C compressor relay control signal circuit 

voltage between ECM connector and vehicle body 
ground.
• Ignition switch is at “ON” position: 10 – 14 V
• Ignition switch is at “OFF” position: 0 – 1 V

Is it in good condition?

Substitute a known 
good ECM and recheck.

Go to Step 4.

4

A/C compressor relay power supply voltage check
1) Turn ignition switch to OFF position.
2) Remove A/C compressor relay.
3) Check that A/C compressor relay power supply voltage 

between A/C compressor relay connector and vehicle 
body ground.
• Ignition switch is at “ON” position: 10 – 14 V
• Ignition switch is at “OFF” position: 0 – 1 V

Is it in good condition?

Go to Step 5.

Repair or replace power 
supply circuit of A/C 
compressor relay.

5

A/C compressor relay check
Check A/C compressor relay for operation referring to “A/C 
Compressor Relay Inspection in Section 7B”.

Is it in good condition?

Control signal circuit of 
A/C compressor relay is 
open or short. If circuit is 
OK, substitute a known 
good ECM and recheck.

Replace A/C 
compressor relay.

Engine General Information and Diagnosis:  1A-142

DTC P0661 / P0662: Intake Manifold Tuning Valve Control Circuit Low / High

S6JB0B1104054

Wiring Diagram

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 by using scan tool if any.
3) Start engine and run it for 10 seconds.
4) Check DTC by using scan tool.

BLU/BLK

BLU/BLK

BLU/BLK

BLU/BLK

GRY/RED

BLK/RED

BLK/RED

BLK/RED

BLU

12V 5V

E23-8  

E23-16
E23-2 
E23-3 

C37-29 

WHT/GRN

C37-59

C37-58

C37-39

C37-73

C37-80

BLK/YEL

BLK/ORN

BLK/ORN

BLK/YEL
BLK/YEL

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E23

C37

BLK/ORN

C37-81

BLK/YEL

BLK/WHT

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P

C

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I6JB01110048-03

P: IMT vacuum solenoid valve power supply circuit

3. “IG COIL” fuse

7. “FI” fuse

C: IMT vacuum solenoid valve control circuit

4. Fuse box No.2

8. “IGN” fuse

1. IMT vacuum solenoid valve

5. Ignition switch

2. Main relay

6. ECM

DTC detecting condition

Trouble area

DTC P0661: Intake Manifold Turning Valve Control Circuit Low
Circuit voltage of intake manifold tuning vacuum solenoid valve is less 
than specification even if it solenoid valve is turned OFF.
(1 driving cycle detection logic but MIL does not light up)

• IMT vacuum solenoid valve and its circuit
• ECM

DTC P0662: Intake Manifold Turning Valve Control Circuit High
Circuit voltage of intake manifold tuning vacuum solenoid valve is more 
than specification even if it solenoid valve is turned ON.
(1 driving cycle detection logic but MIL does not light up)

1A-143 Engine General Information and Diagnosis: 

DTC Troubleshooting

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

 

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

IMT vacuum solenoid valve power supply voltage check
1) Disconnect connector from IMT vacuum solenoid valve 

with ignition switch turned OFF.

2) Check for proper terminal connection to IMT vacuum 

solenoid valve and ECM connectors.

3) If connections are OK, check that IMT vacuum solenoid 

valve power supply voltage is battery voltage between 
IMT vacuum solenoid valve connector and vehicle body 
ground with ignition switch turned ON.

Is it in good condition?

Go to Step 3.

Repair or replace IMT 
vacuum solenoid valve 
power supply circuit.

3

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

turned OFF.

2) Check that IMT vacuum solenoid valve circuit is as 

follows.
• Wiring harness resistance of IMT vacuum solenoid 

valve control circuit is less than 3 

Ω.

• Insulation resistance of IMT vacuum solenoid valve 

control circuit is infinity between IMT vacuum solenoid 
valve connector and vehicle body ground.

• Insulation resistance of wire harness is infinity 

between IMT vacuum solenoid valve control terminal 
and each other terminal at IMT vacuum solenoid valve 
connector.

• Circuit voltage of IMT vacuum solenoid valve control 

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

Are they in good condition?

Go to Step 4.

Repair or replace IMT 
vacuum solenoid valve 
control circuit.

4

IMT vacuum solenoid valve check
1) Check IMT vacuum solenoid valve for coil resistance 

referring to “IMT Vacuum Tank Assembly Inspection in 
Section 1C”.

Is it in “good condition”?

Substitute a known 
good ECM and recheck.

Replace IMT vacuum 
solenoid valve.

Engine General Information and Diagnosis:  1A-144

DTC P1107 / P1108: Manifold Absolute Pressure Sensor Rationality Check - Low / High

S6JB0B1104055

Wiring Diagram

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.

 

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

°C (14 °F) or higher

• Engine coolant temperature: higher than 45 

°C (113 °F) 

• The following DTC(s) are not detected: MAF sensor, ECT sensor and MAP sensor (other than P1107 

and P1108)

 

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 warm up to normal operating temperature.
4) Increase vehicle speed to 35 mph (56 km/h) for 30 sec.
5) Stop vehicle and check DTC and pending DTC by using scan tool.

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E23

C37

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GRY/RED

5V

C37-49  

C37-68  

RED/WHT

GRY/GRN

GRY/RED

GRY/GRN

C37-67  

I6JB01110049-03

1. MAP sensor

3. To other sensors

2. To other sensors

4. ECM

DTC detecting condition

Trouble area

DTC P1107: Manifold Absolute Pressure Sensor Rationality Check - Low
Input voltage of MAP sensor circuit is lower than the 1 V even though vehicle 
runs under engine load factor of 43% or more.
(2 driving cycle detection logic)

• MAP sensor and its circuit
• ECM

DTC P1108: Manifold Absolute Pressure Sensor Rationality Check - High
Input voltage of MAP sensor circuit is more than the specified 2.7 V even though 
vehicle runs under engine load factor of 27% or less.
(2 driving cycle detection logic)