DTC P0603 [YF (2.0L Zetec)]

id0102d0821500

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 of low, the PCM determines that the backup voltage circuit has a malfunction.

POSSIBLE CAUSE

• Meltdown MAIN fuse
• Connector or terminal malfunction
• Short to GND 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 REPAIR INFORMATION AVAILABILITY
• Check for related Service bulletins and/or on-line repair information availability.
• Is any repair information available?
Yes
Perform repair or diagnosis according to available repair information.
• If vehicle is not repaired, go to next step.
No
Go to next step.
3
INSPECT MAIN FUSE
• Turn ignition key to 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 GND
• Turn ignition key to OFF.
• Disconnect battery cables.
• Check continuity between MAIN fuse terminals (harness-side) and body GND.
• Is there continuity?
Yes
Repair or replace harness for short to GND and install new fuse, then go to Step 7.
No
Go to step 7.
5
INSPECT PCM CONNECTOR FOR POOR CONNECTION
• Turn ignition key to 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 ignition key to 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 P1562 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear DTC from memory using WDS or equivalent.
• Turn ignition key to OFF, then start engine.
• Is same DTC present?
Yes
Replace PCM, then go to next step.
No
Go to next step.
8
VERIFY AFTER REPAIR PROCEDURE
• Perform "AFTER REPAIR PROCEDURE".
• Are any DTCs present?
Yes
Go to applicable DTC inspection.
No
Troubleshooting completed.