TROUBLESHOOTING GUIDE
F-67spec tableTroubleshooting steps 7-10 (continued)
7
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) [See fig1: INSTALL CLAMPS]
ResultYes
ACTIONCheck if fuel line pressure decreases when accelerating quickly. → If decreases, check for clogging between fuel pump and pressure regulator. → If no decrease, go to next step
7
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. → If not clogged, check fuel pump maximum pressure (page F-108)
8
INSPECTIONCheck for correct ignition timing at idle (page F-75). Ignition timing: 10° ± 1° BTDC [See fig2: GND TEN CONNECT TERMINALS]
ResultYes
ACTIONCheck if ignition timing advances when accelerating. → If advances, go to next step. → If no advance, replace ECU (page F-127)
8
INSPECTION
ResultNo
ACTIONAdjust (page F-75)
9
INSPECTIONCheck if cooling system is OK (page E-3)
ResultYes
ACTIONGo to next step
9
INSPECTION
ResultNo
ACTIONRepair or replace: • Thermostat (page E-8), • Electric cooling fan (page B-11), • Radiator (page E-7)
10
INSPECTIONTry known good ECU and check if condition improves (page F-127)
ResultYes
ACTIONReplace ECU
10
INSPECTION
ResultNo
ACTIONChange fuel to another brand or use higher octane fuel