Mitsubishi Eclipse 1990 Service Manual page 458

Scan tool 154
Code General scan tool
No.
44
[Comment]
Background
Battery temperature input is used to adjust the generator charging rate based upon the ambient
temperature around the battery.
Range of Check
Ignition switch: ON
Set Conditions
The sensor voltage remains more than 4.9
Replace the PCM.
Scan tool 155
C o d e G e n e r a l s c a n t o o l U p s t r e a m
No.
[Comment]
Background
When the heated oxygen sensor temperature is low, the sensor has the same electrical
characteristics as an insulator.
The heated oxygen sensor output signal line is restricted to
is approx. when the heated oxygen sensor temperature is low.
If the heated oxygen sensor output signal line is grounded, its voltage will become low.
Range of Check
Engine coolant temperature when the engine starts:
Within three seconds after the engine
Set Conditions
The heated oxygen sensor output signal line is
Check the harness wire between the PCM and upstream heated
oxygen sensor connector.
Replace the PCM.
ENGINE
Temperature Sensor
Voltage Too High
for 3 seconds.
Ground
or less.
OK
TSB Revision
Shorted to
That is why the line voltage
or less
NG
Repair
Battery temperature sensor
PCM failed
.
Upstream, heated oxygen sensor failed
Wiring harness and connectors failed
PCM failed