Troubleshooting O K - TOHATSU MFS25 Service Manual

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1 Troubleshooting List
2 Power Unit
....................................... 9-3
State 1 : Engine will not start or is a little hard to start. ... 9-3
Starting System .................................... 9-3
Ignition System .................................... 9-5
Fuel System ....................................... 9-7
State 2 : Full throttle engine revolution speed is low.
Engine revolution speed fall off.Engine stalls ... 9-9
Ignition System .................................... 9-10
Fuel System ....................................... 9-11
Lubrication System .............................. 9-12
Cooling System .................................... 9-13
State 3 : Engine rotation is unstable or hunting occurs
in low speed range............................... 9-14
Ignition System .................................... 9-15
Fuel System ....................................... 9-16
3 PTT Unit
............................................. 9-17
State 1 : PTT will not operate. ........................ 9-17
State 2 : PTT is not capable of sustaining outboard motor.... 9-18
4 3AC Diagnosis ..............................
1.Set Up ................................................ 9-19
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Troubleshooting
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K
..................... 9-2
2.Hardware Connection ........................ 9-22
3.Position of ON/OFF switch for function
4.Operating Procedure ........................ 9-24
10) Explanation of Error Codes ............... 9-31
11) Exit Diagnostic .............................. 9-31
9-19
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1) Software Install .............................. 9-20
2) If putting CD into CD drive will not cause
installation software to start. ............... 9-21
3) Diagnosis File Information ............... 9-21
1) Preparation ................................. 9-22
Test and Running (Drop) test ............... 9-23
1) Start Up ....................................... 9-24
2) Menu Selection .............................. 9-24
3) Preface and Introducion .................. 9-24
4) Setting Communication (COM) Port ... 9-25
5) Monitoring ECU data ..................... 9-26
6) Monitoring History and failure code retrieval... 9-27
7) Function Test................................. 9-28
8) Running Test (Drop Test) ............... 9-29
9) Air Purging from high pressure fuel circuit ... 9-30
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