TROUBLESHOOTING GUIDE — 24 LACK OF POWER
F-56prose procedure24 LACK OF POWER
DESCRIPTION:
- Performance poor under load
- Reduced maximum speed
NOTE
[TROUBLESHOOTING HINTS]
① Factors other than engine malfunction
• Clutch slipping
• Brake dragging
• Low tire pressure
• Unrecommended tire size
• Overloaded
② Low intake air amount
• Throttle valve not open fully
• Clogged intake air system
③ Air/Fuel mixture too lean or too rich
• Fuel line pressure low or high
• Insufficient fuel injection
④ Poor ignition
⑤ Low engine compression
Troubleshooting Guide (steps 1–4)
1
INSPECTIONCheck factors other than engine
- Clutch slipping (page H-3)
- Brake dragging (page P-27)
- Low tire pressure (page Q-3)
- Unrecommended tire size (page Q-2)
RESULTYes
ACTIONGo to next step
1
INSPECTIONCheck factors other than engine
- Clutch slipping (page H-3)
- Brake dragging (page P-27)
- Low tire pressure (page Q-3)
- Unrecommended tire size (page Q-2)
RESULTNo
ACTIONRepair
2
INSPECTIONCheck if throttle valve fully opens when depressing accelerator fully
RESULTYes
ACTIONGo to next step
2
INSPECTIONCheck if throttle valve fully opens when depressing accelerator fully
RESULTNo
ACTIONCheck if accelerator cable is correctly installed (page F-96)
- If OK, check throttle body (page F-94)
- If not OK, install accelerator cable correctly (page F-96)
3
INSPECTIONCheck if "00" is displayed on Self-Diagnosis Checker with ignition switch ON (page F-78)
RESULTYes
ACTIONGo to next step
3
INSPECTIONCheck if "00" is displayed on Self-Diagnosis Checker with ignition switch ON (page F-78)
RESULTNo
ACTIONMalfunction Code No. displayed
Check for cause (Refer to specified check sequence) (page F-80)
"88" flashes
Check ECU terminal 1F voltage (page F-128)
Voltage: Approx. 12V (Ignition switch ON)
- If OK, replace ECU (page F-127)
- If not OK, check wiring between ECU and Self-Diagnosis Checker (page F-7)
4
INSPECTIONCheck switches for correct operation with Self-Diagnosis Checker Monitor Lamp and ignition switch ON (page F-89)
RESULTYes
ACTIONGo to next step
4
INSPECTIONCheck switches for correct operation with Self-Diagnosis Checker Monitor Lamp and ignition switch ON (page F-89)
RESULTNo
ACTIONLamp not ON/OFF with specified switch
Check for cause (Refer to specified check sequence) (page F-90)
Lamp always ON
Check wiring between ECU terminal 1D and Self-Diagnosis Checker (page F-7)
See also
H-3CLUTCH - OUTLINE, TROUBLESHOOTING GUIDEP-27PARKING BRAKE SYSTEMQ-3WHEELS AND TIRESQ-2OUTLINE, TROUBLESHOOTING GUIDEF-96INTAKE AIR SYSTEMF-94INTAKE AIR SYSTEMF-78SELF-DIAGNOSIS FUNCTIONF-80SELF-DIAGNOSIS FUNCTIONF-128CONTROL SYSTEM - Engine Control Unit Terminal Voltage TableF-127CONTROL SYSTEM - Engine Control Unit InspectionF-7OUTLINE - WIRING DIAGRAMF-89SELF-DIAGNOSIS FUNCTIONF-90SELF-DIAGNOSIS FUNCTION