Mitsubishi Eclipse 1990 Service Manual page 429

[Comment)
Unsuccessful attempt to write to an EEPROM location by the control module.
Replace the PCM.
Scan tool 57
Code General scan
No.
23
[Comment]
Background
When the fuel system is in the open loop mode, the heated oxygen sensor cannot be
used for injector pulse width calculation.
In this instance, the system uses information on air mass to determine the correct
width necessary to achieve the proper air/fuel ratio.
Because air mass is related to temperature, information from the intake air temperature
sensor is necessary.
Range of Check
Ignition switch: ON
Set Condition
Intake air temperature sensor output voltage is less than 0.2
Check the intake air temperature sensor. (Refer to
Check trouble symptom.
Check the harness wire
temperature sensor connector.
Replace the PCM.
ENGINE
EEPROM Write Denied
Intake Air Temperature
Voltage Low
OK
OK
NG
OK
TSB Revision
, Troubleshooting
Probable
.
for 3 seconds.
NG
Replace
Repair
Repair
PCM
Sensor to
Sensor internally shorted
PCM failed
I
,
,