Pinpoint Test M : DTC P0603
WARNING: This page is about a different car, the 2018 Ford Focus. However, it is still accessible from the selected car via links, so may be relevant.
- Refer to Transmission Controls - DPS6
for schematic and connector information.
Normal Operation and Fault Conditions
Battery voltage is supplied to the PCM and the TCM to maintain keep alive memory when the ignition is turned off. Anytime the battery is disconnected, P0603 will set in the PCM and the TCM indicating that the battery has been disconnected. P0603 will also set if the circuits supplying battery voltage to the PCM or TCM are open or shorted to ground.
DTC Fault Trigger Conditions
DTC Description Fault Trigger Condition TCM P0603:00 Internal Control Module Keep Alive Memory (KAM) Error: No Sub Type Information If keep alive power is interrupted to the PCM or TCM. Possible Sources
- M1 CHECK TCM KEEP ALIVE MEMORY CIRCUIT
- Ignition OFF.
- Disconnect TCM C1750A.
- Measure:
Positive Lead Measurement / Action Negative Lead C1750A-18 Ground
Is the voltage greater than 11 volts?
Yes INSTALL a new TCM. REFER to: Transmission Control Module (TCM) . No VERIFY BJB fuse 26 (15A) is OK. If OK, REPAIR the circuit. If not OK, REFER to OEM Electrical Wiring Diagram Introduction (Except Electric) to identify the possible causes of the short circuit. Refer to Connector Repair Procedures for schematic and connector information.