TROUBLESHOOTING GUIDE — 26 RUNS ROUGH ON DECELERATION/BACKFIRE
F-64flowchart26 RUNS ROUGH ON DECELERATION/BACKFIRE
Description
Engine runs rough while decelerating and abnormal combustion occurs in exhaust system
Detail
NOTE
[TROUBLESHOOTING HINTS] (1) Air/Fuel mixture too rich: Air cleaner element clogged; Fuel injection control malfunction (Fuel cut control); Injector fuel leakage; Ignition timing misadjustment.
Troubleshooting steps 1-3
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 with 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 for correct ignition timing at idle (page F-75). Ignition timing: 10° ± 1° BTDC. (Connect GND-TEN terminals.)
RESULTYes
ACTIONGo to next step
3
INSPECTION
RESULTNo
ACTIONAdjust (page F-75)