Mitsubishi Lancer (4A9 engine). Manual - part 210
DC/DC CONVERTER <VEHICLES WITH AUTO STOP & GO (AS&G) SYSTEM>
CHASSIS ELECTRICAL
54A-502
STEP 7. Check the wiring harness between C-65
DC/DC converter connector terminal No.9 and
fusible link (36) <Petrol> or (38) <Diesel>.
• Check the power supply line for open circuit and
short circuit.
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 8. Resistance measurement at C-65 DC/DC
converter connector.
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Check the continuity between terminal No.10 and
earth.
OK: Continuity exists (2
Ω or less)
Q: Is the check result normal?
YES :
No action is necessary and testing is
complete.
NO :
Go to Step 9.
STEP 9. Check the wiring harness between C-65
DC/DC converter connector terminal No.10 and
body earth.
• Check the body earth wires for open circuit.
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.
Inspection Procedure 2: Audio equipment is reset or sound jump occurs at auto start.
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.
COMMENTS ON TROUBLE SYMPTOM
If a reset or sound jump occurs with the AUDIO
equipment at the auto start, the following causes can
be suspected.
• Diagnosis code No. B1301 or B1302 is stored in
AS&G-ECU, and voltage is not boosted by DC/
DC converter at auto start
• DC/DC converter internal malfunction
• Battery voltage drop
• Communication error with AS&G-ECU and DC/
DC converter
• AS&G-ECU malfunction
NOTE: If a reset or sound jump occurs with AUDIO
equipment at other than the auto start, a problem is
present with the power supply to the equipment that
experienced the reset or sound jump. Therefore, be
sure to check the power supply to the equipment.
PROBABLE CAUSES
• The DC/DC converter may be defective.
• The AS&G-ECU may be defective.
• The battery may be defective.
• Damaged harness wires and connectors
DIAGNOSIS PROCEDURE
STEP 1. Check the power supply system circuit
Check the DC/DC converter power supply circuit by
referring to Troubleshooting. (Refer to .)
Q: Is the check result normal?
ACA00895AQ
Connector: C-64, C-65 <RHD>
C-65 (GR)
C-64
ACA00892
Connectors: C-64, C-65 <LHD>
AQ
C-64
C-65 (GR)