TROUBLESHOOTING GUIDE — 7 CRANKS NORMALLY BUT HARD TO START — AFTER WARM-UP
F-29spec table7 CRANKS NORMALLY BUT HARD TO START — AFTER WARM-UP
DESCRIPTION: Engine cranks at normal speed but requires excessive cranking time (more than 5 sec.) before starting after running and hot soaked. Battery in normal condition. Engine starts normally when cold.
NOTE
[TROUBLESHOOTING HINTS] (1) Air/Fuel mixture too rich: Fuel injection control malfunction; Injector fuel leakage. (2) Vapor lock: Fuel pressure not held in fuel line after engine stops; High RVP (winter) fuel used in warm weather.
Troubleshooting steps 1-4
1
INSPECTIONCheck if '00' is displayed on Self-Diagnosis Checker with ignition switch ON — page F-78
RESULTYes
ACTIONGo to next step
1
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
2
INSPECTIONCheck if ECU terminal voltages are OK (2D and 2Q) — page F-129
RESULTYes
ACTIONGo to next step
2
INSPECTIONCheck if ECU terminal voltages are OK (2D and 2Q) — page F-129
RESULTNo
ACTIONCheck for cause (Refer to "Check Point for Each Terminal") — page F-132
3
INSPECTIONRun engine at idle and check if fuel line pressure is held after ignition switch turned OFF — page F-102; Fuel line pressure: More than 147 kPa (1.5 kg/cm², 21 psi) for 5 min.
RESULTYes
ACTIONGo to next step
3
INSPECTIONRun engine at idle and check if fuel line pressure is held after ignition switch turned OFF — page F-102; Fuel line pressure: More than 147 kPa (1.5 kg/cm², 21 psi) for 5 min.
RESULTNo
ACTIONBlock outlet of pressure regulator and check if fuel line pressure is held after ignition switch turned OFF — page F-111; If OK, replace pressure regulator — page F-112; If not OK, check fuel pump hold pressure — page F-107; If fuel pump is OK, check injector for fuel leakage — page F-113
4
INSPECTIONTry known good ECU and check if condition improves — page F-127
RESULTYes
ACTIONReplace ECU
4
INSPECTIONTry known good ECU and check if condition improves — page F-127
RESULTNo
ACTIONChange fuel to another brand
See also
F-78SELF-DIAGNOSIS FUNCTIONF-80SELF-DIAGNOSIS FUNCTIONF-128CONTROL SYSTEM - Engine Control Unit Terminal Voltage TableF-127CONTROL SYSTEM - Engine Control Unit InspectionF-7OUTLINE - WIRING DIAGRAMF-129CONTROL SYSTEM - Engine Control Unit Terminal Voltage Table (continued)F-132CONTROL SYSTEM - Check Point for Each Terminal (continued)F-102FUEL SYSTEMF-111PRESSURE REGULATORF-112FUEL SYSTEMF-107FUEL PUMPF-113FUEL SYSTEM