Mitsubishi Lancer (4A9 engine). Manual — part 209
DC/DC CONVERTER <VEHICLES WITH AUTO STOP & GO (AS&G) SYSTEM>
CHASSIS ELECTRICAL
54A-498
DC/DC CONVERTER <VEHICLES WITH AUTO STOP & GO
(AS&G) SYSTEM>
SPECIAL TOOL(S)
M1549700100015
DC/DC CONVERTER <VEHICLES WITH AUTO STOP & GO (AS&G) SYSTEM>
CHASSIS ELECTRICAL
54A-499
Tool
Number
Name
Use
MB991955
a. MB991824
b. MB991827
c. MB991910
d. MB991911
e. MB991825
f. MB991826
M.U.T.-III sub-
assembly
a. Vehicle
Communication
Interface (V.C.I.)
b. M.U.T.-III USB
cable
c. M.U.T.-III main
harness A
(Vehicles with CAN
communication
system)
d. M.U.T.-III main
harness B
(Vehicles without
CAN
communication
system)
e. M.U.T.-III measure
adapter
f. M.U.T.-III trigger
harness
CAUTION
For vehicles with CAN
communication, use M.U.T.-III
main harness A to send
simulated vehicle speed. If you
connect M.U.T.-III main harness
B instead, the CAN
communication does not
function correctly.
CAN bus diagnostics, diagnosis
code or service data check.
MB991223
a. MB991219
b. MB991220
c. MB991221
d. MB991222
Harness set
a. Check harness
b. LED harness
c. LED harness
adapter
d. Probe
Continuity check and voltage
measurement at harness wire or
connector
a. For checking connector pin
contact pressure
b. For checking power supply
circuit
c. For checking power supply
circuit
d. For connecting a locally
sourced tester
MB991910
MB991826
MB991955
MB991911
MB991824
MB991827
MB991825
a
b
c
d
e
f
DO NOT USE
MB991223
a
d
c
b
DO NOT USE
BA
DC/DC CONVERTER <VEHICLES WITH AUTO STOP & GO (AS&G) SYSTEM>
CHASSIS ELECTRICAL
54A-500
TROUBLESHOOTING
STANDARD FLOW OF DIAGNOSTIC
TROUBLESHOOTING
M1549700300019
Refer to GROUP 00
− Contents of troubleshooting .
TROUBLE SYMPTOM CHART
M1549700400016
SYMPTOM PROCEDURES
Inspection Procedure 1: Check the DC/DC converter power supply circuit.
CAUTION
Even when the diagnosis code No. B1301 or B1302 is set in the AS&G-ECU, do not conclude as a DC/
DC converter or AS&G-ECU error, and be sure to check the DC/DC converter power supply circuit.
MB992006
Extra fine probe
Continuity check and voltage
measurement at harness wire or
connector
Tool
Number
Name
Use
MB992006
Inspection
Procedure
No.
Trouble symptom
Reference
page
1
Check the DC/DC converter power supply circuit.
2
Audio equipment is reset or sound jump occurs at auto start.
ACA00887
AU
Connectors: C-309, C-313 <RHD>
C-309 (B)
ETACS-ECU
C-313 (BR)
ACA00886
AV
Connectors: C-309, C-313 <LHD>
ETACS-ECU
C-313 (BR)
C-309 (B)
DC/DC CONVERTER <VEHICLES WITH AUTO STOP & GO (AS&G) SYSTEM>
CHASSIS ELECTRICAL
54A-501
CIRCUIT OPERATION
• The power supply to the DC/DC converter is pro-
vided by the fusible link (36) <Petrol> or (38)
<Diesel>.
• The ACC signal is received C-65 DC/DC con-
verter connector terminal No.6 from C-313
ETACS-ECU connector terminal No.9.
PROBABLE CAUSES
• The DC/DC converter connector may be defec-
tive.
• The battery may be defective.
• Damaged harness wires and connectors
DIAGNOSIS PROCEDURE
STEP 1. Battery test
Check the battery state. (Refer to .)
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Replace the battery.
STEP 2. M.U.T.-III ETACS system data list
Check the input signal of ACC relay.
• Turn the ignition switch to the ACC position.
OK: Normal condition is displayed.
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Refer to ETACS
− Input Signal Procedure 1
"The ignition switch (ACC) signal is not sent
to the ETACS-ECU" .
STEP 3. Connector check: C-65 DC/DC converter
connector and C-313 ETACS-ECU connector
Q: Is the check result normal?
YES :
Go to Step 4.
NO :
Repair the defective connector.
STEP 4. Voltage measurement at C-65 DC/DC
converter connector.
(1) Disconnect C-65 DC/DC converter connector,
and measure at the wiring harness side.
(2) Turn the ignition switch to "ACC" position.
(3) Measure the voltage between terminal No.6 and
body earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Go to Step 6.
STEP 5. Check the harness wire between C-313
ETACS connector terminal No.1 and C-65 DC/DC
converter connector terminal No.6.
• Check the signal line for open circuit and short
circuit.
NOTE: Prior to the wiring harness inspection, check
C-31 intermediate connector, and repair if necessary.
Q: Is the check result normal?
YES :
The trouble can be an intermittent
malfunction (Refer to GROUP 00, How to
use Troubleshooting/inspection Service
Points, How to Cope with Intermittent
Malfunction ).
NO :
Repair the wiring harness.
STEP 6. Voltage measurement at C-65 DC/DC
converter connector.
(1) Disconnect C-65 DC/DC converter connector,
and measure at the wiring harness side.
(2) Measure the voltage between terminal No.9 and
body earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 8.
NO :
Go to Step 7.
Item No.
Item name
Normal
condition
Item 288
ACC switch
ON
ACA00892
Connectors: C-65 <LHD>
AP
C-65 (GR)
ACA00895AP
Connector: C-65 <RHD>
C-65 (GR)
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