What part of ecm controls keep alive memory - 1988 Dodge Dakota

Error Code P1633 means the PCM (powertrain control module, also known as ECM or engine control module in other vehicle makes) has detected a low voltage on the Keep Alive memory circuit. ... If the battery is disconnected, or the voltage drops below 10.5V, the error code will be set.

code p 0603 refers to engine control module (ECM)--KAM error ( KAM= keep alive memory)===causes faulty ECM
also it refers to system voltage ---malfunction===causes --wiring --poor connections battery -- alternator
to start , have the battery load tested, then have the charging circuit checked fully , and check to see if the voltage regulator is part of the ECM
if it is replace the ECM

code p 0603 refers to engine control module (ECM)-KAM error=====causes ECM
it also refers to system voltage ---malfunction==== causes ---wiring---poor connection,---battery---alternator
Having this information to hand , I would start by checking the battery terminals are shiny clean and tight, have the battery load tested to check for internal failure and the alternator bench tested to ensure operation is correct
After that I would substitute the ECM with a known good unit
Remember that some vehicles have the regulator in the circuit of the ECM and if that was faulty , you would get the faulty ECM code as well

U need to be sure u pulled negative battery cable for the keep alive memory to clear from the system. When ever servicing an electrical issue

Depends on model. http://www.obd-codes.com/p1605

Instead of guessing as to what the problem is or expecting someone on here having a magical fix , take it to a qualified repair shop. Before assuming the worst an wanting to condem the PCM - powertrain control module . Will a scan tool communicate with it ? If your pulling codes it is .
DTC P0603 Control Module Long Term Memory Reset
The PCM has a memory area where it stores certain data it needs to save when the key is turned OFF. This area is called Keep Alive Memory. This diagnostic test monitors the PCM's keep alive memory for a loss or unintended change of data. If such a condition occurs, DTC P0603 will set.
Diagnostic Aids
If the battery has been disconnected for any reason DTC P0603 will set. The PCM keeps a running check on the memory; if memory changes it resets. An intermittent loss of power or ground to the PCM will cause a reset.

Have you disconnected the battery ?
Diagnostic Aids
If the battery has been disconnected for any reason DTC P0603 will set. The PCM keeps a running check on the memory; if memory changes it resets. An intermittent loss of power or ground to the PCM will cause a reset.

P1633 definition is Keep alive power,This can be generated when you have a interruption to the ECM memory,this can be caused by a bad battery connection,or a open fuse to the KAPWR (keep alive power)

P0763 - Shift Solenoid C Electrical
Possible causes- Faulty shift solenoid C valve
- Shift solenoid C valve harness or connectors
- Shift solenoid C valve circuit is open or shorted
- Low transmission fluid level
- Dirty transmission fluid
When is the code detected?The P0763 code is detected when the gear required by the ECM does not match the actual gear when vehicle is driven.Symptoms- Engine Light ON (or Service Engine Soon Warning Light)
- Transmission will not shift gears.P0763 Description Shift solenoid valve C is turned ON or OFF by the Transmission Control Module (TCM) in response to signals sent from the park/neutral position (PNP) switch, vehicle speed and Engine Control Module (ECM) (throttle opening). Gears will then be shifted to the optimum position.

P1600 - Loss of KAM (Keep Alive ECM memory) Power; Open Circuit

Check all fuses related to the ECM

P0603 - Internal Control Module Keep Alive Memory Error

Possible causes- Loose or poor battery terminal connection
- Low battery charge
- ECM/PCM power supply circuit is open or shorted
- ECM/PCM Programing
- Faulty ECM/PCM

P0603 means Internal Control Module Keep Alive Memory (KAM) Error

In other words, that code is set when the PCM loses "keep alive" memory B+.

This code can also be set if the batteries went dead at some point, but mainly it means there is an open circuit detected in the KAM circuit.

On a '97 F-250, check for a 5 amp fuse blown in fuse cavity #2. If the fuse is blown, check for and repair the short-to-ground in circuit #729 (red with white coloured wire).

Good luck dear.

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