Mitsubishi Eclipse 1990 Service Manual page 764

17-24
ENGINE AND EMISSION CONTROL
INSPECTION PROCEDURE: FOR TROUBLE SYMPTOMS
INSPECTION PROCEDURE 1
Communication with scan tool is not possible. (Communication with
all systems is not possible.)
[Comment]
A defect in the power supply system (including ground) for the diagnostic line may be present.
Refer to GROUP
INSPECTION PROCEDURE 2
Communication with scan tool is not possible.
(Communication with auto-cruise control-ECU only is not
possible.)
[Comment]
ground circuit may be present.
1. Auto-cruise control main switch circuit malfunction
Auto-cruise control main switch check
to
OK
Measure at auto-cruise control main
switch connector
Disconnect the connector and mea-
sure at the harness side.
Voltage between the terminal (1)
and around
OK: Battery positive voltage
24, and
2. Auto-cruise control-ECU ground circuit malfunction
Measure at auto-cruise control-ECU
connector
Disconnect the connector and mea-
sure at the harness side.
Continuity between terminal (6) and
ground, terminal (8) and ground and
between terminal (14) and ground.
OK: Continuity
OK
OK
Check trouble symptom.
mainswitch
N G
Repair
N G
Check trouble symptom.
. Repair
Check the harnesses between the
auto-cruise control main switch and
ground or between the auto-cruise
control main switch and auto-cruise
control-ECU. Repair, if
Check the following connector:
Check trouble symptom.
. Replace the auto-cruise control-ECU.
TSB Revision
Auto-cruise Control System
Probable cause
Malfunction of the auto-cruise control
switch.
Malfunction of the connector.
Malfunction of the harness.
Malfunction of the auto-cruise control-ECU.
Check the harness between the
auto-cruise control main switch and
power supply. Repair, if necessary.
OK
Malfunction of the connector.
Malfunction of the harness.