Suzuki GSX-R1000. Service Manual - part 13

1A-130 Engine General Information and Diagnosis: 

Active Control Inspection

1) Set up the SDS tool. (Refer to SDS operation manual for further details.)

2) Turn the ignition switch ON.

3) Click “EVAP purge valve operating control” (1).

4) Click each button (2). At this time, if an operating sound is heard from the EVAP system purge control valve, the 

function is normal.

1

I947H1110139-01

2

I947H1110140-01

Engine General Information and Diagnosis:  1A-131

DTC “C91” (P0500): Vehicle Speed Sensor Circuit Malfunction

B947H11104033

Detected Condition and Possible Cause

Wiring Diagram

ECM coupler (Harness side)

Troubleshooting

CAUTION

!

 

When using the multi-circuit tester, do not strongly touch the terminal of the ECM coupler with a 
needle pointed tester probe to prevent terminal damage.

 

NOTE

After repairing the trouble, clear the DTC using SDS tool. Refer to “Use of SDS Diagnosis Reset 
Procedures” (Page 1A-14).

 

Detected Condition

Possible Cause

Speedometer does not receive signal from the vehicle 
speed sensor for more than 6 sec. when the motorcycle is 
running. ECM does not receive signal from the vehicle 
speed sensor for more than 6 sec. when the motorcycle is 
running. Failure in communication between ECM and 
speedometer with reference to vehicle speed.

• Speed sensor circuit open or short.

• Speed sensor malfunction.

• Speedometer malfunction.

• ECM malfunction.

ECM

B/W

B/R

P

Speed sensor

Speed sensor

To Speedometer

B/W

B/R

B

2

I837H1110116-01

1

2

3

4

5

6

7

8

9 10 11 12

13 14 15 16 17 18 19 20 21 22 23 24

25 26 27 28 29 30 31 32 33 34 35 36

37 38 39 40 41 42 43 44 45 46 47 48

49 50 51 52 53 54 55 56 57 58 59 60

61 62 63 64 65 66 67 68 69 70 71 72

I837H1110007-02

1A-132 Engine General Information and Diagnosis: 

Step

Action

Yes

No

1

1) Turn the ignition switch OFF.

2) Lift and support the fuel tank. Refer to “Fuel Tank 

Removal and Installation” in Section 1G (Page 1G-9).

3) Check the speed sensor coupler (1) for loose or poor 

contacts.
If OK, remove the speed sensor. Refer to “Speed Sensor 
Removal and Installation” in Section 9C (Page 9C-5).

4) Connect 12 V battery, 10 k

Ω

 resistor and the multi-circuit 

tester as shown in the figure.

Special tool

(A):  09900–25008 (Multi circuit tester set)

Tester knob indication
Voltage (

)

• P wire open or 

shorted to ground.

• Loose or poor 

contacts on the 
speed sensor coupler 
or ECM coupler 
(terminal “2”).

• If wires and 

connection are OK, 
intermittent trouble or 
faulty ECM.

• Recheck each 

terminal and wire 
harness for open 
circuit and poor 
connection.

• Replace the ECM 

with a known good 
one, and inspect it 
again.

• Inspect that metal 

particles or foreign 
material stuck on the 
speed sensor and 
rotor tip.

• If there are no metal 

particles and foreign 
material, then replace 
the speed sensor 
with a new one.

1

I947H1110110-01

12 V

B/W

B

B/R

Speed sensor

I837H1110118-01

Engine General Information and Diagnosis:  1A-133

Step

Action

Yes

No

1

5) Under this condition, if a suitable screwdriver touching 

the pick-up surface of the speed sensor is moved, the 
tester reading voltage changes (0 V 

→

 12 V or 12 V 

→

 0 

V). If the tester reading voltage does not change, replace 
the speedometer sensor with a new one.

NOTE

While testing, the highest voltage reading should 
be the same as the battery voltage (12 V).

 

Is the voltage OK?

• P wire open or 

shorted to ground.

• Loose or poor 

contacts on the 
speed sensor coupler 
or ECM coupler 
(terminal “2”).

• If wires and 

connection are OK, 
intermittent trouble or 
faulty ECM.

• Recheck each 

terminal and wire 
harness for open 
circuit and poor 
connection.

• Replace the ECM 

with a known good 
one, and inspect it 
again.

• Inspect that metal 

particles or foreign 
material stuck on the 
speed sensor and 
rotor tip.

• If there are no metal 

particles and foreign 
material, then replace 
the speed sensor 
with a new one.

I837H1110119-01

1A-134 Engine General Information and Diagnosis: 

DTC “C93” (P1769): Steering Damper Solenoid Valve Circuit Malfunction

B947H11104034

Detected Condition and Possible Cause

Wiring Diagram

ECM coupler (Harness side)

Troubleshooting

CAUTION

!

 

When using the multi-circuit tester, do not strongly touch the terminal of the ECM coupler with a 
needle pointed tester probe to prevent terminal damage.

 

NOTE

After repairing the trouble, clear the DTC using SDS tool. Refer to “Use of SDS Diagnosis Reset 
Procedures” (Page 1A-14).

 

Detected Condition

Possible Cause

C93

Steering damper control current does not flow to 
the solenoid valve. With IG turned ON, ECM 
detects a failure of internal circuit element. 
Solenoid current does not converge to the target 
value. Battery voltage is 10 V or below with the 
engine running.

• Steering damper solenoid valve circuit 

interrupter element shorted.

• Feedback current convergence failure.

• Low battery voltage.

• ECM malfunction.

P1769

H

Steering damper control current is higher than 
specified value. An abnormal current is detected 
during the vehicle standstill. Solenoid current is 0.7 
A or above.

• Steering damper solenoid valve circuit shorted 

to VCC.

L

Steering damper control current is lower than 
specified value. With IG turned ON, ECM detects a 
discontinuity. An abnormal current is detected 
during the vehicle standstill.

• Steering damper solenoid valve circuit open.

• Steering damper solenoid valve circuit shorted.

ECM

Br

W

B/O

B/Bl

Steering damper 
solenoid valve

Steering damper

Steering damper

25

26

I947H1110111-02

1

2

3

4

5

6

7

8

9 10 11 12

13 14 15 16 17 18 19 20 21 22 23 24

25 26 27 28 29 30 31 32 33 34 35 36

37 38 39 40 41 42 43 44 45 46 47 48

49 50 51 52 53 54 55 56 57 58 59 60

61 62 63 64 65 66 67 68 69 70 71 72

I837H1110007-02

Engine General Information and Diagnosis:  1A-135

Step

Action

Yes

No

1

1) Turn the ignition switch OFF.

2) Check the steering damper solenoid valve coupler (1) for 

loose or poor contacts. 
If OK, then measure the steering damper solenoid valve 
resistance.

3) Disconnect the steering damper solenoid valve coupler.

4) Measure the steering damper solenoid valve resistance.

Special tool

(A):  09900–25008 (Multi circuit tester set)

Tester knob indication
Resistance (

Ω

)

Steering damper solenoid valve resistance
Approx. 12.5 

Ω

 at 20 

°

C (68 

°

F)

Is the resistance OK?

Go to Step 2.

Replace the steering 
damper with a new one.

1

I947H1110112-01

(A)

I837H1110121-01

1A-136 Engine General Information and Diagnosis: 

2

1) Turn the ignition switch ON.

2) Measure the voltage between B/Bl wire and ground.

Special tool

(A):  09900–25008 (Multi circuit tester set)

Tester knob indication
Voltage (

)

Steering damper solenoid valve voltage
Approx. 10 V when battery is fully charged condition
((+) terminal: B/Bl – (–) terminal: Ground)

Is the voltage OK?

• B/Bl (W) wire shorted 

to VCC, or poor “26” 
connection failure.

• B/O (Br) wire open or 

shorted to ground, or 
poor “25” connection 
failure.

• If wire and 

connection are OK, 
intermittent trouble or 
faulty ECM.

• Recheck each 

terminal and wire 
harness for open 
circuit and poor 
connection. 

• Replace the ECM 

with a known good 
one, and inspect it 
again.

• Low battery voltage 

or fuse is blown.

• B/Bl (W) wire open or 

shorted to ground, or 
poor “26” connection 
failure.

• If wire and 

connection are OK, 
intermittent trouble or 
faulty ECM.

• Recheck each 

terminal and wire 
harness for open 
circuit and poor 
connection.

• Replace the ECM 

with a known good 
one, and inspect it 
again.

Step

Action

Yes

No

(A)

I947H1110113-01

Engine General Information and Diagnosis:  1A-137

Active Control Inspection

1) Set up the SDS tool. (Refer to SDS operation manual for further details.)

2) Raise the front wheel off the ground.

3) Turn the ignition switch ON.

4) Click “Steering damper solenoid operating control” (1).

5) Click each button (2) ON/OFF while turning the handlebars left and right.

NOTE

At this time, if the steering damping resistance changes from light to heavy by switching ON/OFF, the 
function is normal.

 

1

I947H1110141-01

1

2

I947H1110142-01

1A-138 Engine General Information and Diagnosis: 

Specifications

Service Data

B947H11107001

Injector + Fuel Pump + Fuel Pressure Regulator

FI Sensors

Item

Specification

Note

Injector resistance

11 – 13 

Ω

 at 20 

°

C (68 

°

F)

Item

Standard/Specification

Note

CKP sensor resistance

142 – 194 

Ω

CKP sensor peak voltage

0.5 V and more

When cranking

IAP sensor input voltage

4.5 – 5.5 V

IAP sensor output voltage

Approx. 2.7 V at idle speed

TP sensor input voltage

4.5 – 5.5 V

TP sensor output voltage

Closed

Approx. 1.1 V

Opened

Approx. 4.4 V

ECT sensor input voltage

4.5 – 5.5 V

ECT sensor output voltage

0.15 – 4.85 V

ECT sensor resistance

Approx. 2.45 k

Ω

 at 20 

°

C (68 

°

F)

IAT sensor input voltage

4.5 – 5.5 V

IAT sensor output voltage

0.15 – 4.85 V

IAT sensor resistance

Approx. 2.58 k

Ω

 at 20 

°

C (68 

°

F)

AP sensor input voltage

4.5 – 5.5 V

AP sensor output voltage

Approx. 3.6 V at 100 kPa (760 mmHg)

TO sensor resistance

16.5 – 22.3 k

Ω

TO sensor voltage

Normal

0.4 – 1.4 V

Leaning

3.7 – 4.4 V

When leaning 65

°

GP switch voltage

0.6 V and more

From 1st to Top

Injector voltage

Battery voltage

Ignition coil primary peak voltage

80 V and more

When cranking

HO2 sensor output voltage

0.3 V and less at idle speed

0.6 V and more at 5 000 r/min

HO2 sensor heater resistance

6.7 – 9.5 

Ω

 at 23 

°

C (73 

°

F)

PAIR control solenoid valve 
resistance

20 – 24 

Ω

 at 20 – 30 

°

C (68 – 86 

°

F)

STP sensor input voltage

4.5 – 5.5 V

STP sensor output voltage

Closed

Approx. 0.7 V

Opened

Approx. 4.1 V

STVA resistance

Approx. 6.5 

Ω

EXCVA position sensor input 
voltage

4.5 – 5.5 V

EXCVA position sensor output 
voltage

Closed

0.45 – 1.4 V

Opened

3.6 – 4.55 V

EXCVA position sensor resistance

Approx. 3.1 k

Ω

At adjustment 

position

EVAP system purge control 
solenoid valve resistance

Approx. 32 

Ω

 at 20 

°

C (68 

°

F)

E-33 only

ISC valve resistance

Approx. 80 

Ω

 at 20 

°

C (68 

°

F)

Steering damper solenoid valve 
resistance

Approx. 12.5 

Ω

 at 20 

°

C (68 

°

F)

Steering damper solenoid valve 
voltage

Approx. 10 V

Battery fully 

charged

Engine General Information and Diagnosis:  1A-139

Special Tools and Equipment

Special Tool

B947H11108001

09900–25008

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09900–25009

Multi circuit tester set

Needle-point probe set

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09904–41010

09917–47011

SUZUKI Diagnostic system 
set

Vacuum pump gauge set

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1A-140 Engine General Information and Diagnosis: 

09930–82720

99565–01010–020

Mode selection switch

CD-ROM Ver.20

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Emission Control Devices:  1B-1

Engine

Emission Control Devices

Precautions

Precautions for Emission Control Devices

B947H11200001

Refer to “General Precautions” in Section 00 (Page 00-1).

General Description

Fuel Injection System Description

B947H11201001

GSX-R1000 motorcycles are equipped with a fuel injection system for emission level control. This fuel injection system 
is precision designed, manufactured and adjusted to comply with the applicable emission limits. With varying engine 
conditions, all of the fuel injection volumes are precisely controlled by the programmed injection maps in the ECM to 
reduce CO, NOX and HC. Adjusting, interfering with, improper replacement, or resetting of any of the fuel injection 
components may adversely affect injection performance and cause the motorcycle to exceed the exhaust emission 
level limits.

1

2

3

5

6

7

“C”

4

“A”

“B”

8

I947H1120001-03

1. Fuel tank

4. Fuel feed hose

7. Secondary fuel injector

“B”: Pressurized fuel

2. Fuel pump

5. Fuel delivery pipe

8. Fuel pressure regulator

“C”: Relieved fuel

3. Fuel mesh filter

6. Primary fuel injector

“A”: Pre-pressurized fuel

1B-2 Emission Control Devices: 

Crankcase Emission Control System Description

B947H11201002

The engine is equipped with a PCV system to prevent discharging crankcase emissions into the atmosphere. Blow-by 
gas in the engine is constantly drawn into the crankcase, which is returned to the combustion chamber through the 
PCV (breather) hose, air cleaner and throttle body.

1

2

“C”

“D”

“E”

“A”

“B”

I947H1120002-02

1. PAIR control solenoid valve

“A”: Fresh air

“C”: Exhaust gas

“E”: Return oil

2. PCV hose

“B”: Fuel/Air mixture

“D”: Blow-by gas

Emission Control Devices:  1B-3

Exhaust Emission Control System Description

B947H11201003

The exhaust emission control system is composed of the PAIR system, exhaust control system, HO2 sensor, three-
way catalyst system and ISC system. The fresh air is drawn into the exhaust ports through the PAIR control solenoid 
valve and PAIR reed valves. The PAIR control solenoid valve is operated by the ECM, which is controlled according to 
the signals from TPS, ECTS, IAPS and CKPS. The exhaust gas flow is performed by the exhaust control valve 
actuator which is controlled by the ECM by changing the exhaust control valve angle. ISC valve adjusts the bypass air 
volume of the throttle body to control engine idling speed with various sensor signals by varying engine running 
conditions.

1

2

3

5

6

7

8

9

10

4

“A”

“B”

I947H1120003-01

1. PAIR control solenoid valve

4. Primary fuel injector

7. Exhaust control valve actuator

10. HO2 sensor

2. PAIR reed valve

5. Secondary fuel injector

8. Exhaust control valve

“A”: Fresh air

3. Air cleaner box

6. ECM

9. Three-way catalyst

“B”: Exhaust gas

1B-4 Emission Control Devices: 

PAIR System Diagram

B947H11201006

Noise Emission Control System Description

B947H11201004

TAMPERING WITH THE NOISE CONTROL SYSTEM PROHIBITED: Local law or federal law prohibits the following 
acts or the causing thereof:

• The removal or rendering inoperative by any person, other than for purposes of maintenance, repair or 

replacement, of any device or element of design incorporated into any new vehicle for the purpose of noise control 
prior to its sale or delivery to the ultimate purchaser or while it is in use, or

• The use of the vehicle after such device or element of design has been removed or rendered inoperative by any 

person.

1

1

2

“A”

“B”

2

I947H1120004-01

1. PAIR control solenoid valve

2. PAIR reed valve

“A”: Fresh air

“B”: Exhaust gas

Emission Control Devices:  1B-5

Among Those Acts Presumed to Constitute Tampering are the Acts Listed Below:

• Removing or puncturing the muffler, baffles, header pipes, screen type spark arrester (if equipped) or any other 

component which conducts exhaust gases.

• Removing or puncturing the air cleaner case, air cleaner cover, baffles or any other component which conducts 

intake air.

• Replacing the exhaust system or muffler with a system or muffler not marked with the same model specific code as 

the code listed on the Motorcycle Noise Emission Control Information label.

Evaporative Emission Control System Diagram (Only for E-33)

B947H11201005

1

2

3

5

6

7

8

9

“C”

“D”

10

4

“A”

“B”

I947H1120005-02

1. Fuel tank

6. IAP sensor

“A”: Fuel

2. Fuel-vapor separator

7. Surge hose

“B”: HC vapor

3. Fuel pump

8. EVAP canister

“C”: Fresh air

4. Fuel feed hose

9. Purge hose

“D”: Vacuum

5. Fuel shut-off valve

10. EVAP system purge control solenoid valve