Suzuki Grand Vitara JB416 / JB420 / JB419. Manual — part 54

1A-163 Engine General Information and Diagnosis: For Petrol Engine Model

DTC P0601 / P0602 / P0607: Internal Control Module Memory Check Sum Error / Control Module
Programming Error / Control Module Performance

S6JB0A1114055

System Description
Internal control module is installed in ECM.

DTC Detecting Condition and Trouble Area

DTC Confirmation Procedure

1) Connect scan tool to DLC with ignition switch turned OFF.
2) Turn ON ignition switch and clear DTC, pending DTC and freeze frame data by using scan tool.
3) Start engine and run it at idle if possible.
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: For Petrol Engine Model”.

5

A/C refrigerant pressure sensor ground circuit check
1) Turn OFF ignition switch, measure resistance between

engine ground and “GRY/GRN” wire terminal of A/C
refrigerant pressure sensor connector.

Is resistance below 5

Ω

?

Go to Step 7.

Go to Step 6.

6

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

connected.

2) Measure resistance between engine ground and “C37-

57” terminal of ECM connector.

Is resistance below 5

Ω

?

“GRY/GRN” wire is
open or high resistance
circuit.

ECM grounds “C37-58”,
“C37-48”, “C37-30”,
“C37-29” and/or “C37-
15” is open or high
resistance circuit.

7

A/C refrigerant pressure sensor check
1) Check A/C refrigerant pressure sensor referring to “A/C

Refrigerant Pressure Sensor and Its Circuit Inspection
(Petrol Engine Model) in Section 7B”

Is it good condition?

Substitute a known-
good ECM and recheck.

Faulty A/C refrigerant
pressure sensor.

Step

Action

Yes

No

DTC detecting condition

Trouble area

DTC P0601:
Data write error or check sum error
(1 driving cycle detection logic)
DTC P0602:
Data programming error
(1 driving cycle detection logic)
DTC P0607:
Data programming error
(1 driving cycle detection logic)

ECM

Engine General Information and Diagnosis: For Petrol Engine Model 1A-164

DTC P0616: Starter Relay Circuit Low

S6JB0A1114056

Wiring Diagram

DTC Detecting Condition and Trouble Area

Step

Action

Yes

No

1

DTC recheck
1) Clear DTC referring to “DTC Clearance: For Petrol

Engine Model”.

2) Turn OFF ignition switch.
3) Turn ON ignition switch and check DTC.

Is DTC P0601 or P0607 still indicated?

Go to Step 2.

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

2

ECM power and ground circuit check
1) Check that ECM power supply circuit and ECM ground

circuit is in good condition referring to “ECM Power and
Ground Circuit Check: For Petrol Engine Model”.

Are check results OK?

Substitute a known-
good ECM and recheck.

Repair ECM power or
ground circuit.

E23

C37

3

4

18

19

5

6

7

10

11

17

20

47

46

49

50

51

21

22

52

16

25

9

24

14
29

55

57

54 53

59

60

58

2

26

27

28

15
30

56

48

32

31

34

35

36

37

40

42

39 38

44

45

43

41

33

1

12

13

23

8

3

4

18

19

5

6

7

10

11

17

20

47

46

49

50

51

21

22

52

16

25

9

24

14
29

55

57

54 53

59

60

58

2

26

27

28

15
30

56

48

32

31

34

35

36

37

40

42

39 38

44

45

43

41

33

1

12

13

23

8

3

7

1

E23-29

6

BLK/YEL

BLK/YEL

BLK/YEL

C37-22

BLK/WHT

BLK/YEL

BLK/YEL

8

4

WHT/GRN

WHT/RED

5

BLK/RED

[A]: BLK/RED
[B]: BLK

BLK

C37-15

C37-29
C37-48

BLK/ORN

C37-58

C37-30 BLK/ORN

BLK/YEL
BLK/YEL
BLK/YEL

9

10

BLK/YEL

2

11

I5JB0A110062-02

[A]: For A/T model

4. Fuse box No.2

9. “STR MOT” fuse

[B]: For M/T model

5. Transmission range switch (for A/T model)

10. “IGN” fuse

1. ECM

6. Starting motor control relay

11. Starting motor magnet switch

2. Starter motor

7. “IG COIL” fuse

3. Ignition switch

8. “ST SIG” fuse

DTC detecting condition

Trouble area

Engine starts even though vehicle is at stop and engine
starter signal is low voltage.
(2 driving cycle detection logic)

• Engine starter signal circuit
• ECM

1A-165 Engine General Information and Diagnosis: For Petrol Engine Model

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.
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 P0617: Starter Relay Circuit High

S6JB0A1114057

Wiring Diagram
Refer to “DTC P0616: Starter Relay Circuit Low: 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 at idle for 3 min. or more.
4) Check DTC and pending DTC.

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

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

connected.

3) Measure voltage at terminal “C37-22” of ECM connector,

under following condition.

Voltage at terminal “C37-22” of ECM connector
While engine cranking: 6 – 14 V
After starting engine: 0 – 1 V

Is each voltage within specified range?

Poor “C37-22”
connection or
intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection in Section
00”.
If wire and connections
are OK, substitute a
known-good ECM and
recheck.

“BLK/YEL” wire is open
or high resistance
circuit.

DTC detecting condition

Trouble area

Engine starter signal is high voltage for 180 seconds
continuously while engine is running.
(2 driving cycle detection logic)

• Engine starter signal circuit
• ECM

Engine General Information and Diagnosis: For Petrol Engine Model 1A-166

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

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

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

connected.

3) Start engine, measure voltage between “C37-22”

terminal of ECM connector and vehicle body ground.

Is voltage 0 – 1 V?

Intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection in Section
00”. If OK, substitute a
known-good ECM and
recheck.

Go to Step 3.

3

Wire circuit check
1) Disconnect starting motor control relay in fuse box No.2

with ignition switch turned OFF.

2) Check for proper connection to starting motor control

relay at “BLK/YEL”, “BLK/RED” and “BLK” (for M/T
model) wire terminals.

3) Disconnect connector from starting motor.
4) Measure voltage between “C37-22” terminal of ECM

connector and vehicle body ground with ignition switch
turned ON.

Is voltage 0 – 1 V?

Go to Step 4.

“BLK/YEL” wire is
shorted to power circuit.
If wires are OK,
substitute a known good
ECM and recheck.

4

Wire circuit check
1) Measure voltage between “BLK/YEL” wire terminal for

coil side of starting motor control relay connector coil
side and vehicle body ground with ignition switch turned
ON.

Is voltage 0 – 1 V?

Check starting motor
control relay. If OK,
substitute a known-
good ECM and recheck.

Check ignition switch
referring to “Ignition
Switch Inspection in
Section 9C”.
If ignition switch is OK,
check for short circuit
between ignition switch
and starting motor
control relay to power
circuit.