P1633 - Keep Alive Power (KAPWR) Voltage Too Low
Description:
Indicates the KAPWR circuit has experienced a voltage interrupt.
Possible Causes:
- Open KAPWR circuit
- Intermittent KAPWR
Diagnostic Aids:
Loss of KAPWR to the powertrain control module (PCM) results in immediate malfunction indicator lamp (MIL) illumination and DTC P1633.
Application
Key On Engine Off
Key On Engine Running
Continuous Memory
All
GO to Pinpoint Test QB .
QB: DTCs P0603 or P1633: Keep Alive Power (KAPWR)
Introduction
QB: Pinpoint Tests
This pinpoint test is intended to diagnose the following:
- battery terminal condition
- KAPWR wire routing
- harness circuit: KAPWR
- powertrain control module (PCM) (12A650)
Powertrain Control Module (PCM) Connector
For PCM connector views or reference values, refer to Section 6 .
Vehicle
Connector
Pin
Circuit
Edge,
F-150,
Five Hundred,
Freestyle,
Mark LT,
MKX,
Montego
190 Pin
B54
KAPWR
Escape/Mariner,
Focus
150 (50-50-50) Pin
B45
KAPWR
Expedition,
Fusion,
Milan,
MKZ,
Navigator
140 Pin
B54
KAPWR
All other vehicles
170 Pin
B45
KAPWR
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