Nissan Skyline R34 workshop service manual page 22

text version of content this owner's manual page from owners manual to the vehicle Nissan Skyline, year of production 1998 - 2002:

TROUBLE DIAGNOSES --- - - - -- -- - - Fail-safe and Backup Functions 0 The fail-safe function estimates the opening conditions with other input signals and selects safer condi- tions for the engine (vehicle) control, based on the data previously stored in the control unit, when any of the critical sensors in the ECM fails. The backup function allows the vehicle to be driven, using control signals previously stored in the control G] unit, even if the critical part of the system fails. Function Related Malfunction Fail-safehacku p MIL indication sensor I ECM The microcomputer in the control Fixes the ignition timing, fuel injection pulse width, and MIL lights up. A' Backup (-TCM) unit (CPU) is malfunctioning. AAC valve opening to the preset values so that the vehicle can be driven. -- -- Selects the fuel injection pulse width according to the %R Mass air Output voltage dropped below engine speed and the throttle opening so that the vehicle flow 0.3V while the engine is running. can be driven. Fuel injection will be inhibited when the MIL lights up. sensor engine speed exceeded approx. 2,400 rpm. During fail-safe ST control, idle speed is controlled to 800 rpm. Engine Uses the estimated engine coolant temperature (varies with coolant Same as self-diagnostic malfunc- elapsed time after start) to perform controls so that the R8 tempera- tion detection conditions. vehicle can be driven normally. The auxiliary electric fan MIL lights up. ture sen- relay is turned ON. On RB25DET model, the turbo pres- sor sure control solenoid valve remains OFF. Heated Heated oxygen sensor output d voltage exceeded approx. 2V for Inhibits aidfuel ratio feedback control. MIL lights up. owen d sensor predetermined time. Fail-safe Knock Same as self-diagnostic malfunc- Judges the vehicle as of regular specification. Retards the function sensor tion detection conditions. ignition timing within the knocking range so that the vehicle can be driven normally. Determines idle position according to the throttle position Throttle and the engine speed. position Same as self-diagnostic malfunc- Fixes the output to the preset value so that the vehicle can MIL lights up. sensor tion detection conditions. be driven normally. On RB25DET model, the turbo pressure control solenoid valve remains OFF. -- Throttle Same as self-diagnostic malfunc- Fixes the throttle motor sensor output to the preset value motor tion detection conditions. by turning the TCS switch ONIOFF, so that the vehicle can MIL lights up. sensor be driven normally. Motor Same as self-diag nostic malfunc- throttle tion detection conditions. Fixes the TCS switch OFF. switch t -

owners manual Nissan Skyline

owners manual Nissan Skyline - year of production: 1998, 1999, 2000, 2001, 2002 - Nissan Skyline R34 workshop service manual EN