Suzuki GSX-R750 User Manual

Name: Suzuki GSX-R750
Brand: Suzuki
Rating: 4 (1 reviews)

659 pages

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1A-78 Engine General Information and Diagnosis:

DTC “C24” (P0351), “C25” (P0352), “C26” (P0353) or “C27” (P0354): Ignition System Malfunction

B838H21104018

NOTE

Refer to “No Spark or Poor Spark in Section 1H (Page 1H-5)” for details.

DTC “C28” (P1655): Secondary Throttle Valve Actuator (STVA) Malfunction

B838H21104019

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-15)”.

Detected Condition Possible Cause

The operation voltage does not reach the STVA.

ECM does not receive communication signal from the

STVA. STVA can not operate properly or its motor locked.

• STVA malfunction.

• STVA circuit open or short.

• STVA motor malfunction.

ECM

STVA. 2B

STVA. 1A

STVA. 1B

STVA

B/Lg

P/W

W/B

STVA. 2A

W/B

I837H1110056-01

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I837H1110007-02

Questions and Answers:

E
eclaytonJul 26, 2025
How to troubleshoot difficult starting on a Suzuki GSX-R750?
- P
  Pamela CastroJul 26, 2025
  If your Suzuki Motorcycle is difficult to start, begin by checking the engine oil level for any signs of leakage. Next, inspect the engine coolant level, also looking for leaks. Ensure that the fuel level is adequate and that there are no fuel leaks. Examine the air cleaner element for clogging, and assess the battery's condition. Check the throttle cable play, and inspect all vacuum hoses for looseness, bends, or disconnections. Also, check for a broken fuse, verify the FI light operation, and check each warning light operation. Check speedometer operation. Check for exhaust gas leakage and noise. Check each coupler disconnection. Check clogged radiator fins.

Suzuki GSX-R750 Specifications

General

Engine Type	4-stroke, 4-cylinder, liquid-cooled, DOHC
Displacement	750cc
Compression Ratio	12.5:1
Fuel System	Fuel injection
Front Suspension	Inverted telescopic, coil spring, oil damped
Rear Suspension	Link type, coil spring, oil damped
Overall Width	710 mm (28.0 in)
Ground Clearance	130 mm (5.1 in)
Seat Height	810 mm (31.9 in)
Curb Weight	190 kg (419 lbs)
Ignition	Electronic ignition (transistorized)
Starter	Electric
Final Drive	Chain
Bore x Stroke	70.0 mm x 48.7 mm
Transmission	6-speed, constant mesh
Rear Brakes	Disc
Front Tires	120/70ZR17M/C (58W)
Rear Tires	180/55ZR17M/C (73W)
Fuel Tank Capacity	17.0 L (4.5 US gallons)
Overall Length	2, 030 mm (79.9 in)
Wheelbase	1390 mm (54.7 in)
Front Brakes	Dual hydraulic disc