Check The Engine-A/T-Ecu Power Supply And Earth Circuit; Power Supply System And Ignition Switch-Ig System - Mitsubishi MOTORS Lancer 2005 Workshop Manual Supplement

INSPECTION PROCEDURE 26

Check the engine-A/T-ECU power supply and earth circuit.

Measure the engine-A/T-ECU connectors, C-124, C-126.
D Disconnect the connector and measure at the harness side
(1) Voltage between 98 and earth (Ignition switch: ON)
OK: System voltage
(2) Voltage between 49 and earth
OK: System voltage
(3) Voltage between 41, 47 and earth
OK: System voltage (when the terminal 49 is earthed)
(4) Continuity between 42, 48 and earth
OK: Continuity
(5) Voltage between 66 and earth
OK: System voltage
OK
NG
Check the following
connectors:
C-124, C-126
OK
Check the trouble symptom.
NG
Replace the engine-A/T-ECU.
Check the harness wire between engine-A/T-ECU and battery,
and repair if necessary.
INSPECTION PROCEDURE 27

Power supply system and ignition switch-IG system

When an ignition switch ON signal is input to the engine-A/T-ECU, the engine-A/T-ECU
turns the engine control relay ON. This causes battery voltage to be supplied to the
engine-A/T-ECU, injectors and air flow sensor.
Check the engine control relay. (Refer to P.13D-96.)
Measure at the engine control relay connector B-16X.
D Disconnect the connector, and measure at the harness side.
D Voltage between 3, 4 and earth
OK: System voltage
Check the engine-A/T-ECU power supply and earth circuit.
(Refer to P.13D-59, INSPECTION PROCEDURE 26.)
MPI <4G63>
Repair
OK
OK
Troubleshooting
(1) NG
Check the following
connectors: C-14,
C-209, C 210
(2), (3) NG
OK
Check the trouble symptom.
(4) NG
OK
Check the harness wire
(5)
betweenengine-A/T-ECU
NG
and ignition switch con-
nector.
OK
Check the ignition switch.
(Refer to GROUP 54
Check the following
connectors: A-13,
B-16X, C-12
OK
Check the trouble symptoms.
NG
Check the harness wire between engine-A/T-ECU and control relay
connector, and repair if necessary.
Check the harness wire between engine-A/T-ECU and earth, and
repair if necessary.
Probable cause
D Malfunction of the ignition switch
D Malfunction of the engine control relay
D Improper
short-circuited harness wire
D Disconnected engine-A/T-ECU earth wire
D Malfunction of the engine-A/T-ECU
NG
Replace
NG
Check the following
connector: A-13
OK
Check the trouble symptom.
NG
Checktheharnesswirebetweenbatteryandcontrolrelayconnector,
and repair if necessary.
13D-59
NG
Repair
NG
Repair
Ignition Switch and Immobilizer System.)
NG
Repair
connector contact, open circuit
NG
Repair
or