DTC P0603[AJ (3.0L Duratec)]

id0102a4821500

DTC P0603

Internal control module KAM error
DETECTION CONDITION
•  The PCM monitors the voltage of the back-up battery positive terminal at PCM terminal 55. If the PCM detects battery positive terminal voltage too low, the PCM determines that the backup voltage circuit has a malfunction.
POSSIBLE CAUSE
•  Meltdown MAIN fuse
•  Connector or terminal malfunction
•  Short to ground circuit between battery positive terminal and PCM terminal 55
•  Open circuit between battery positive terminal and PCM terminal 55
•  PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION
1
VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
•  Has FREEZE FRAME DATA been recorded?
Yes
Go to next step.
No
Record FREEZE FRAME DATA on repair order, then go to next step.
2
VERIFY RELATED SERVICE INFORMATION AVAILABILITY
•  Check for related Service Information and/or on-line Service Information availability.
•  Is any Service Information available?
Yes
Perform repair or diagnosis according to available Service Information.
•  If vehicle is not repaired, go to next step.
No
Go to next step.
3
INSPECT MAIN FUSE
•  Turn the ignition switch off.
•  Inspect MAIN fuse for failure and proper.
•  Is it normal?
Yes
Go to step 5.
No
•  If MAIN fuse has melted, go to next step.
•  If MAIN fuse is not installed correctly, install it correctly then go to Step 7.
4
INSPECT MONITOR CIRCUIT FOR SHORT TO GROUND
•  Turn the ignition switch off.
•  Disconnect battery cables.
•  Check continuity between MAIN fuse terminals (harness-side) and body ground.
•  Is there continuity?
Yes
Repair or replace harness for short to ground and install new fuse, then go to Step 7.
No
Go to step 7.
5
INSPECT PCM CONNECTOR FOR POOR CONNECTION
•  Turn the ignition switch off.
•  Disconnect PCM connector.
•  Check for poor connection (such as damaged, pulled-out pins, and corrosion).
•  Is there any malfunction?
Yes
Repair or replace terminal, then go to Step 7.
No
Go to next step.
6
INSPECT MONITOR CIRCUIT FOR OPEN CIRCUIT
•  Turn the ignition switch off.
•  Disconnect battery cables.
•  Disconnect PCM connector.
•  Check continuity between battery positive terminal (harness-side) and PCM terminal 55 (harness-side).
•  Is there continuity?
Yes
Go to next step.
No
Repair or replace harness for open circuit, then go to next step.
7
VERIFY TROUBLESHOOTING OF DTC P0603 COMPLETED
•  Make sure to reconnect all disconnected connectors.
•  Clear DTC from memory using M-MDS.
•  Turn the ignition switch off, then start engine.
•  Is same DTC present?
Yes
Replace PCM, then go to next step.
(See PCM REMOVAL/INSTALLATION[AJ (3.0L Duratec)].)
No
Go to next step.
8
VERIFY AFTER REPAIR PROCEDURE
•  Perform "AFTER REPAIR PROCEDURE".
•  Are any DTCs present?
Yes
Go to applicable DTC inspection.
(See DTC TABLE[AJ (3.0L Duratec)].)
No
Troubleshooting completed.