TROUBLESHOOTING GUIDE
F-53prose procedureTroubleshooting Guide (steps 6–12)
6
INSPECTIONCheck if air duct and air hoses are correctly installed (page F-76)
RESULTYes
ACTIONGo to next step
6
INSPECTIONCheck if air duct and air hoses are correctly installed (page F-76)
RESULTNo
ACTIONRepair (page F-92)
7
INSPECTIONCheck for correct intake manifold vacuum at idle
Vacuum: More than about 450 mmHg (17.7 inHg)
RESULTYes
ACTIONGo to next step
7
INSPECTIONCheck for correct intake manifold vacuum at idle
Vacuum: More than about 450 mmHg (17.7 inHg)
RESULTNo
ACTIONCheck for air leakage of intake air system components (page F-93)
8
INSPECTIONCheck if air cleaner element is clean (page F-75)
RESULTYes
ACTIONGo to next step
8
INSPECTIONCheck if air cleaner element is clean (page F-75)
RESULTNo
ACTIONReplace air cleaner element (page F-92)
9
INSPECTIONCheck for correct ignition timing at idle (page F-75)
Ignition timing: 10° ± 1° BTDC
RESULTYes
ACTIONCheck if ignition timing advances when accelerating
- If advances, go to next step
- If no advance, replace ECU (page F-127)
9
INSPECTIONCheck for correct ignition timing at idle (page F-75)
Ignition timing: 10° ± 1° BTDC
RESULTNo
ACTIONAdjust (page F-75)
10
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 line and filter for clogging
- If no decrease, go to next step
10
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)
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)
11
INSPECTIONCheck if exhaust system is restricted (page F-115)
RESULTYes
ACTIONRepair or replace (page F-115)
11
INSPECTIONCheck if exhaust system is restricted (page F-115)
RESULTNo
ACTIONGo to next step
12
INSPECTIONTry known good ECU and check if condition improves (page F-127)
RESULT
ACTION