TROUBLESHOOTING GUIDE — 27 KNOCKING
F-66flowchart27 KNOCKING
NOTE
[TROUBLESHOOTING HINTS] (1) Air/Fuel mixture too lean: Fuel injection amount incorrect; Fuel line pressure decreases while accelerating. (2) Incorrect ignition timing (too advance). (3) Overheating. (4) Carbon deposits in engine.
Troubleshooting steps 1-6 (KNOCKING)
1
INSPECTIONCheck if "00" is displayed on Self-Diagnosis Checker with ignition switch ON (page F-78)
RESULTYes
ACTIONGo to next step
1
INSPECTION
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 switches for correct operation with Self-Diagnosis Checker Monitor Lamp and ignition switch ON (page F-89)
RESULTYes
ACTIONGo to next step
2
INSPECTION
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).
3
INSPECTIONCheck if ECU terminal voltages are OK (2D, 2O and 2Q) (page F-129)
RESULTYes
ACTIONGo to next step
3
INSPECTION
RESULTNo
ACTIONCheck for cause (Refer to "Check Point for Each Terminal") (page F-128)
4
INSPECTIONCheck for correct intake manifold vacuum at idle. Vacuum: More than 450 mmHg (17.7 inHg).
RESULTYes
ACTIONGo to next step
4
INSPECTION
RESULTNo
ACTIONCheck for air leakage of intake air system components (page F-93)
5
INSPECTIONCheck if air cleaner element is clean (page F-75)
RESULTYes
ACTIONGo to next step
5
INSPECTION
RESULTNo
ACTIONReplace air cleaner element (page F-92)
6
INSPECTIONCheck for correct engine compression (page B-10). Engine compression: 1,324—932 kPa (13.5—9.5 kg/cm², 192—135 psi) - 300 rpm.
RESULTYes
ACTIONGo to next step
6
INSPECTION
RESULTNo
ACTIONHigh compression: Check engine condition (page B-10). Carbon deposits.
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-89SELF-DIAGNOSIS FUNCTIONF-90SELF-DIAGNOSIS FUNCTIONF-129CONTROL SYSTEM - Engine Control Unit Terminal Voltage Table (continued)F-93INTAKE AIR SYSTEMF-75ENGINE TUNE-UPF-92INTAKE AIR SYSTEMB-10COMPRESSION