TROUBLESHOOTING GUIDE
F-59flowchartTroubleshooting steps 15-18
15
INSPECTIONCheck for correct fuel line pressure at idle (page F-103). Fuel line pressure: 265—314 kPa (2.7—3.2 kg/cm², 38—46 psi) (Vacuum hose to pressure regulator disconnected).
RESULTYes
ACTIONCheck if fuel line pressure decreases when accelerating quickly. If decreases, check fuel pump maximum pressure (page F-108). If OK, check fuel line and filter for clogging. If no decreases, go to next step.
15
INSPECTION
RESULTNo
ACTIONLow pressure: Check for fuel line pressure while pinching fuel return hose. If fuel line pressure quickly increases, check pressure regulator (page F-111). If fuel line pressure gradually increases, check for clogging between fuel pump and pressure regulator (page F-112). If not clogged, check fuel pump maximum pressure (page F-108).
16
INSPECTIONRun engine several minutes 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
ACTIONHigh pressure: Check if vacuum hose to pressure regulator is damaged or poorly connected. If OK, replace pressure regulator (page F-112). If not OK, repair or replace hose.
16
INSPECTION
RESULTNo
ACTIONCheck injector for fuel leakage (page F-113)
17
INSPECTIONDisconnect each injector connector at idle and check if engine speed decreases equally each time
RESULTYes
ACTIONGo to next step
17
INSPECTION
RESULTNo
ACTIONReplace injector (page F-112)
18
INSPECTIONTry known good ECU and check if condition improves (page F-127)
RESULT
ACTION