ITB16008

Classification:
Reference:
Date:
EC16-005
ITB16-008
February 22, 2016
INFINITI; MIL ON WITH P0603 STORED
FOR ECM BACK UP CIRCUIT
APPLIED VEHICLES:
All 2015-2016 Infiniti vehicles
IF YOU CONFIRM
The MIL is “ON” with DTC P0603 (ECM BACK UP/CIRCUIT).
ACTION
1. Confirm that the battery voltage is 11 volts, or more, with the ignition ON (engine OFF, not running).
2. Erase DTC
3. Perform DTC confirmation steps in the Service Procedure.
4. Confirm 1st trip DTC P0603 is not stored.
NOTE: P0603 is often the result of low battery voltage, discharged battery or
battery terminal disconnections.
Infiniti Bulletins are intended for use by qualified technicians, not 'do-it-yourselfers'. Qualified technicians are properly trained
individuals who have the equipment, tools, safety instruction, and know-how to do a job properly and safely. NOTE: If you believe
that a described condition may apply to a particular vehicle, DO NOT assume that it does. See your Infiniti retailer to determine if this
applies to your vehicle.
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SERVICE PROCEDURE
NOTE: This DTC may have been stored due to low battery voltage, discharged battery or battery terminal
disconnections.
1. Confirm the battery voltage is at least 11 volts, or more, with the ignition ON.

While checking the battery voltage, make sure the battery cables are clean and tight.

Resolve any low battery condition before proceeding. Repairs for a low battery condition are not
covered by this bulletin
2. Connect C-III plus VI to the vehicle.
3. Open C-III plus on the CONSULT PC.
4. Turn ignition “ON”, but Do Not Start engine.
5. Erase DTCs.
6. Turn the ignition OFF.
7. Turn the Ignition ON and wait for at least 1 second.
8. Turn the ignition OFF and wait for at least 10 seconds.
9. Repeat step 7 and step 8 ten times and then proceed to step 10.
10. Turn ignition ON.
11. Is P0603 currently stored as a 1st trip DTC?
NO: Service Procedure complete.
YES: Refer to Electronic Service Manual (ESM), section EC – Engine Control System
for further diagnostic information.
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ITB16-008
CLAIMS INFORMATION
Submit a Primary Operation (PO) type line claim using the following claims coding:
DESCRIPTION
DTC P0603 CONFIRMATION
OP CODE
EX2LAA
3/3
SYM
HD
DIA
32
FRT
0.4
ITB16-008