User manual SUZUKI GSX-R750 SERVICE MANUAL

[. . . ] * This manual has been prepared on the basis of the latest specifications at the time of publication. If modifications have been made since then, differences may exist between the content of this manual and the actual motorcycle. * Illustrations in this manual are used to show the basic principles of operation and work procedures. * This manual is written for persons who have enough knowledge, skills and tools, including special tools, for servicing SUZUKI motorcycles. [. . . ] · Battery voltage supply to the HO2 sensor. C44 (P0135) ECM E2 OX OXH B/Br W/G W/B O/W To GP switch W B Gr W Engine stop Side-stand relay switch Ignition switch INSPECTION Step 1 (When indicating C44/P0130:) 1) Turn the ignition switch OFF. If OK, then check the HO2 sensor lead wire continuity. A S P M HO2 sensor E L 1 1 ! 4) Disconnect the HO2 sensor coupler 5) Check the continuity between W/G wire A and ground. If the sound is not heard from the tester, the circuit condition is OK. 09900-25008: Multi-circuit tester set Tester knob indication: Continuity test () 4-88 FI SYSTEM DIAGNOSIS 7) Disconnect the ECM coupler. HO2S lead wire continuity: Continuity () 09900-25008: Multi-circuit tester set 09900-25009: Needle pointed probe set Tester knob indication: Continuity test () When using the multi-circuit tester, do not storongly touch the terminal of the ECM coupler with a needle pointed tester probe to prevent the terminal damage or terminal bend. (When indicating C44/P0130:) W/G wire shorted to ground, or W/G or B/Br wire open. 1 ! ECM couplers (Harness side) 10)After repairing the trouble, clear the DTC using SDS tool. (4-27) Step 2 (When indicating C44/P0130:) 1) Connect the ECM couplers and HO2 sensor coupler. 3) Measure the HO2 sensor output voltage between W/G wire and B/Br wire, when idling condition. HO2 sensor output voltage at idle speed: 0. 4 V and less (+ W/G ­ - B/Br) A S P M 2 E L V 4) If OK, then remove the air cleaner box (5-14) and pinch the PAIR hoses 1 with proper hose clamps. 5) Measure the HO2 sensor output voltage while holding the engine speed at 5 000 r/min. HO2 sensor output voltage at 5 000 r/min: 0. 6 V and more (+ W/G ­ - B/Br) 09900-25008: Multi-circuit tester set 09900-25009: Needle pointed probe set Tester knob indication: Voltage () FI SYSTEM DIAGNOSIS 4-89 Is the voltage OK?Go to Step 6. 1 4-92 FI SYSTEM DIAGNOSIS Step 1 (When indicating P1657-H:) 1) Turn the ignition switch OFF. (5-8) 3) Check the EXCVA position sensor coupler for loose or poor contacts. If OK, then check the EXCVA position sensor lead wire continuity. 1 4) Disconnect the EXCVA position sensor coupler. If the sound is not heard from the tester, the circuit condition is OK. 1 ] 6) Disconnect the ECM coupler. EXCVA lead wire continuity: Continuity () 09900-25008: Multi-circuit tester set 09900-25009: Needle pointed probe set Tester knob indication: Continuity test () A S P M 1 E L (Gray) (Black) ECM couplers (Harness side) ! When using the multi-circuit tester, do not storongly touch the terminal of the ECM coupler with a needle pointed tester probe to prevent the terminal damage or terminal bend. Y wire shorted to VCC, or B/Br wire open 9) After repairing the trouble, clear the DTC using SDS tool. (4-27) FI SYSTEM DIAGNOSIS 4-93 Step 1 (When indicating P1657-L:) 1) Turn the ignition switch OFF. (5-8) 3) Check the EXCVA position sensor coupler for loose or poor contacts. If OK, then check the EXCVA position sensor lead wire continuity. 1 4) Disconnect the EXCVA position sensor coupler. If the sound is not heard from the tester, the circuit condition is OK. 1 ! 7) Disconnect the ECM coupler. EXCVA lead wire continuity: Continuity () 09900-25008: Multi-circuit tester set 09900-25009: Needle pointed probe set Tester knob indication: Continuity test () When using the multi-circuit tester, do not storongly touch the terminal of the ECM coupler with a needle pointed tester probe to prevent the terminal damage or terminal bend. [. . . ] 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. A S 1 2 3 4 5 6 PAIR control solenoid valve PAIR reed valve Air cleaner box Primary fuel injector Secondary fuel injector ECM 7 8 9 0 A B P M E L Exhaust control valve actuator Exhaust control valve Three-way catalyst HO2 sensor (For E-02, 19) FRESH AIR EXHAUST GAS EMISSION CONTROL INFORMATION 11-5 NOISE EMISSION CONTROL SYSTEM TAMPERING WITH THE NOISE CONTROL SYSTEM PROHIBITED: Local law or federal law prohibits the following acts or the causing thereof: 1. 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 2. The use of the vehicle after such device or element of design has been removed or rendered inoperative by any person. 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. [. . . ]