Suzuki Grand Vitara JB627. Manual — part 49

1A-145 Engine General Information and Diagnosis:

DTC Troubleshooting

DTC P1510: ECM Back-Up Power Supply Malfunction

S6JB0B1104056

Wiring Diagram

Circuit Description
Battery voltage is translated to 5 V in ECM back-up circuit. The voltage is supplied to keep DTC memory, values that
ECM has learned to control engine, etc. in ECM even when ignition switch is turned OFF.

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.

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 check
1) Check MAP sensor for performance referring to

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

Is it in good condition?

Go to Step 3.

Replace MAP sensor.

3

Wire harness check
1) Check power supply, signal and ground circuits of MAP

sensor for connection and high resistance referring to
Step 3 of “DTC P0107 / P0108: Manifold Absolute
Pressure Sensor Circuit Low / High Input”.

Is it in good condition?

Substitute a known
good ECM and recheck.

Repair or replace.

WHT

E23-1

WHT

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1110

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E23

C37

1

2

I6JB01110052-03

1. ECM

2. “DOME” fuse

DTC detecting condition

Trouble area

Backup power voltage of internal circuit is lower than 3 V or more than 7 V.
(1 driving cycle detection logic)

• Battery voltage supply circuit
• ECM

Engine General Information and Diagnosis: 1A-146

DTC Troubleshooting

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

DTC P1603: TCM Trouble Code Detected

S6JB0B1104057

DTC Detecting Condition
When ECM receives a trouble code from TMC, which indicates that some problem occurred in sensor circuits and its
calculated values used for operations such as idle speed control, engine power control, and so on by TCM, ECM sets
DTC P1603. (TCM outputs the trouble code to ECM when TCM can not compute the engine control signal due to
malfunctions of sensor circuits used for gear shift control.)

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

Battery voltage supply circuit check
1) Turn ignition switch to OFF position.
2) Remove ECM from its bracket with ECM connectors

connected.

3) Measure ECM back-up power supply voltage between

ECM connector and vehicle body ground.

Is voltage 10 – 14 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.

ECM back-up power
supply circuit is open or
short.

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

DTC check
1) Check DTC of TCM referring to “DTC Check in Section

5A”.

Is there any DTC(s)?

Go to applicable DTC
troubleshooting.

Substitute a known
good ECM and recheck.

1A-147 Engine General Information and Diagnosis:

DTC P2101: Throttle Actuator Control Motor Circuit Range / Performance

S6JB0B1104058

Wiring Diagram

DTC Detecting Condition and Trouble Area

BLU/BLK

BLU/BLK

BLU/BLK

BLK/RED

BLK/RED

BLK/RED

BLU

12V 5V

E23-8

E23-16
E23-2
E23-3

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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3 2

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1110

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32

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E23

C37

BLK/ORN

C37-81

BLK/YEL

BLK/WHT

BLU/ORN

GRN

BLU/YEL

BLU/RED

BLU/BLK

E23-6

E23-7

E23-5
E23-4

C37-45

C37-46

C37-65

C37-64

BLU/RED

WHT

GRN

RED

BLK

8

11 10 9

13

12

7

5

2

1

4

3

6

C1

S1

S2

C2

I6JB01110056-05

1: Electric throttle body assembly

6: ECM

11: “IGN” fuse

2: Throttle actuator

7: Main relay

12: “IG COIL” fuse

3: Throttle position sensor (main)

8: Fuse box No.2

13: Ignition switch

4: Throttle position sensor (sub)

9: “THR MOT” fuse

5: Throttle actuator control relay

10: “FI” fuse

DTC detecting condition

Trouble area

Difference between actual throttle valve position and target
throttle valve position is more than 2

° for more than 2 seconds.

(1 driving cycle detection logic)

• Throttle actuator circuit
• Electric throttle body assembly
• ECM

Engine General Information and Diagnosis: 1A-148

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) Keep the accelerator pedal at idle position for 2 seconds.
4) Keep the accelerator pedal at fully depressed position for 2 seconds.
5) Repeat Step 3) and 4) for 3 times.
6) Check 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”.

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

DTC check
1) Check DTC.

Is DTC P2135 or P2138 detected?

Go to applicable DTC
diag. flow.

Go to Step 3.

3

Throttle actuator circuit check
1) Check throttle actuator drive circuit referring to Step 2 of

“DTC P2103: Throttle Actuator Control Motor Circuit
High”.

Is it in good condition?

Go to Step 4.

Repair or replace.

4

Electric throttle body assembly check
1) Check electric throttle body for performance referring to

“Electric Throttle Body Assembly On-Vehicle Inspection
in Section 1C”.

Is it in good condition?

Substitute a known
good ECM and recheck.

Repair or replace
electric throttle body
assembly.