P1633 - Keep Alive Power Voltage Too Low
Indicates that the Keep Alive Power (KAPWR) circuit
has experienced a power interrupt.
QB1 CHECK BATTERY TERMINALS
Note: If KAPWR is interrupted to the PCM (that is, when a breakout box
is installed or the battery is disconnected), DTC P0603/P1605 can be generated
on the first power-up.
Are the battery terminal connections in good condition?
Yes
No
KEY OFF. Battery terminals are OK. GO to QB2 .
REPAIR battery terminals as necessary.
QB2 INSPECT ENGINE COMPARTMENT FOR PROPER WIRE ROUTING
Is wiring too close to ignition components or wires?
Yes
No
REROUTE as necessary.
Engine compartment wire routing is OK. GO to QB3 .
QB3 CHECK KEEP ALIVE POWER (KAPWR) TO PCM
Note: Refer to the PCM connector pin numbers in the beginning of this
pinpoint test.
Does the voltage reading indicate less than 10.5 volts?
Yes
No
ISOLATE and REPAIR open circuit.
No open in KAPWR harness circuit detected. GO to QB4 .
QB4 CHECK FOR REPEAT OF DTC P0603/P1605/P1633
Is DTC P0603, P1605 or P1633 present?
Yes
No
REPLACE the PCM.
REPAIR other DTCs as necessary. If none, testing is complete.
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HAD ENGINE CHECKED AND IT GAVE A DEALER CODE OF P1633
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