Mitsubishi Eclipse 1990, Service Manual

Page: 396 / 2103

ENGINE (NON-TURBO)> Troubleshooting
FAIL-SAFE-BACUP FUNKTION Mode) TABLE
When the PCM detects the following malfunction (s), the PCM carries out’ fail safe/back-up
addition, the corresponding DTC number (s) can be identified by using the scan tool.
I
I
I
I
I
1
1
Diagnostic item Control during malfunction
No cam signal at PCM The PCM uses the crankshaft position sensor signal control fuel
timing, etc. (Accordingly, normal sequential fuel injection may not be
out.)
Throttle position sensor
The PCM uses the value calculated from the MAP sensor signal instead of the
age low valve opening angle (voltage).
Throttle position sensor The PCM uses the value calculated from the MAP sensor signal instead of the throttle
age high valve opening angle (voltage).
Engine coolant temperature
l
The PCM uses the default value as the engine
(ECT) sensor voltage too low temperature.
l
The PCM operates the radiator fan.
l
The PCM carries out open loop control.
Engine coolant temperature
l
The PCM uses the default value as the engine
(ECT) sensor voltage too temperature.
high
l
The PCM operates the radiator fan.
l
The PCM carries out open loop control.
Upstream stays at The PCM carries out open loop control.
center
No vehicle speed sensor The PCM controls the engine as if the vehicle speed were 0 mph.
signal
MAP sensor voltage too low The PCM uses the value calculated from the throttle position sensor and the engine
speed signals instead of the MAP value
sensor voltage too high The PCM uses the value calculated from the throttle position sensor and the engine
speed signals instead of the MAP value
change in MAP from start The PCM uses the value calculated from the throttle position sensor and the engine
0 run speed signals instead of the MAP value
ntake air temperature sensor The PCM uses the engine coolant temperature instead of the intake air temperature.
roltage low
ntake air temperature sensor The PCM uses the engine coolant temperature instead of the intake air temperature.
roltage high
sensor
The PCM retards ignition timing according to the knock sensor signal.
Jpstream shorted to The PCM carries out open loop control.
temperature sensor The PCM uses the default value as the battery temperature.
out of limit
speed fan control relay The PCM turns on the high speed fan control relay instead of the low speed fan
relay
Jpstream response The PCM carries out open loop control.
to The PCM carries out open loop control.
oltage
stays at The PCM carries out open loop control.
enter
TSB Revision