Mitsubishi MOTORS Laser 1991, Service Manual, Page: 303 / 320

Troubleshooting
CHECKING THE CIRCUIT AND INDIVIDUAL PART
Description
The battery supplies a stabilized power supply to the
ECU,
via the constant-voltage circuit and terminal (which is directly
connected to the battery).
ECU terminal voltage (Connection condition of the
connector).
ECU
-Terminal
terminal No.
Signal
Condition
voltage
ECU power supply At all times System voltage’
Checking the ground circuit (Disconnect the connector and
check at the wiring harness side.)
ECU Connected
terminal
to/measured
Measurement
Check
No. component
condition
Standard
ECU ground
Resistance -ground At all times Continuity
NOTE
Vehicles for Canada.
SUB FUSIBLE LINK
The key-reminder switch is switched OFF and HIGH-level signals
are sent to the ECU when the key is inserted into the ignition key
cylinder: when the key is removed, the key-reminder switch is
switched ON and LOW-level signals are sent to the ECU.
ECU terminal voltage (Connection condition of the ECU
connector).
Checking the key-reminder switch circuit (Disconnect the
connector of the ECU and check at the wiring harness side.)
0
ECU Connected
terminal
to/measured
Measurement
Check
condition
Standard
No. component
ECU
removed
Continuity
Resistance @-ground
No
inserted continuity
Checking individual part
Key-reminder switch Refer to
I g n i t i o n s w i t c h R e f e r t o