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2000 Taurus I have a Taurus with the same trouble code you posted. I was wondering if you found out what the code (P1633) meant and what to do to correct it. Kelly

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How do i find the KAPWR circut

Replacing parts to fix a fault can cost you a lot of money, and still not fix the fault. A scanned code tells where the fault may be ,but not which part to replace. Google ( Ford P1605 Code - PCM Keep Alive Memory Error). for more info.

Jul 09, 2015 | 2001 Ford Taurus

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What to check for code 1633 2004 Taurus 3.0 engine code p1633

code P1633 refers to the PCM's(engine computer's) memory power being low, which is likely due to fuse 22 being blown. Fuse 22 provides power to the PCM as well as the A/C clutch relay, on the pink/light blue wire. I would suggest tracing the pink/light blue wire from the fusebox to the PCM to see if it is shafed of rubbed through, but most likely it is due to a failed A/C compressor clutch, to verify this you can also start by unplugging the A/C compressor and re-drive the vehicle to see if this corrects the concern. FYI it is very common for compressors to seize on these vehicles causing the fuse to blow once the compressor is turned on, let it be with the heater in A/C mode OR defrost mode

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Apr 21, 2015 | 2004 Ford Taurus

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I have 2000 mustang 3.8 n it shakes really bad n code p1633 comes back. Whats wrong n how do i fix it

Hello Paige ! It sounds like you have a sick vehicle , lets see if I can help you fix it . Well the code you have has to do with lack of voltage to the ECM -engine control module.
P1633 - Keep Alive Power Voltage Too Low Indicates that the Keep Alive Power (KAPWR) circuit has experienced a power interrupt.
  • Open KAPWR circuit
  • Damaged PCM
  • Intermittent KAPWR Circuit
2000 PCED On Board Diagnostics II SECTION 5: Pinpoint Tests Procedure revision date: 01/31/2001 QB: Diagnostic Trouble Code (DTC) P0603/P1605/P1633 > QB: Introduction 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.
  • Inspect the battery cables for loose connections, corrosion.
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
  • Inspect Electronic Engine Control (EC) System wiring for proximity to ignition components or wires.
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.
  • Disconnect PCM.
  • Measure voltage between KAPWR circuit at the PCM harness connector and ground.
  • While observing digital multimeter, grasp the Electronic EC harness and wiggle, shake or bend a small section while working from the PCM to the dash panel.
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
  • Reconnect PCM.
  • Start engine and allow it to reach operating temperature.
  • Run Key On Engine Off Self-Test.
  • Retrieve Continuous Memory DTCs.
Is DTC P0603, P1605 or P1633 present? Yes No REPLACE the PCM. REPAIR other DTCs as necessary. If none, testing is complete. You may want to take this to the repair shop , do you own a volt ohm meter ? Do you know how to use one ?

Mar 14, 2015 | 2000 Ford Mustang

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2001 ford Taurus code P1633 what does it mean and how do I fix it ?

P1633 - Keep Alive Power Voltage Too Low

Indicates that the Keep Alive Power (KAPWR) circuit has experienced a power interrupt.

Possible causes:
-Open KAPWR circuit.
-Damaged PCM.
-Intermittent KAPWR Circuit.

First thing would be to check the fuse associated with the KAP. In your case, that would be fuse #22 (10A). If you're A/C doesn't work, then that's why. Usually the A/C clutch causes the fuse to blow and your get your P1633 code.

If the fuse is fine and the A/C works, then it might be a bad PCM. If the battery was bad before it might have set this code. Have you tried clearing the codes to see if it comes back or not?

Feb 20, 2015 | 2001 Ford Taurus

2 Answers


Ford Taurus model???
this is for ford T 2000
p1633 keep alive memory test failure

Jul 19, 2014 | Ford Taurus Cars & Trucks

1 Answer

05 taurus code p1633 stalls at idle or when slowing down

The KAM circuit for the PCM and the a/c is on the same circuit.
If the PCM does not have memory voltage it will loose the settings every time you turn the key off.
You might want to check the fuses in the engine compartment for a blown fuse for this circuit.
Of course it could have another problem too, such as a faulty idle air control valve.

Jun 29, 2012 | Ford Taurus Cars & Trucks

2 Answers

Code p1633 keeps coming up on check engine light how to fix it


Sep 04, 2011 | 2005 Ford Taurus

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I have a 2004 Ford Taurus. About a week ago, the A/C clutch started making noise. I disconnected the plug, as I can not afford a new compressor, at this time. Two days later, the "Check...

The P0511 code is for the idle air control circuit and the P1633 is stating the the KAM voltage is too low. My guess is if you are having issues with the Idle air control circuit this could cause stalling, especially if the valve is not functioning properly and allowing too much air at idle, this causing the car to stall. I can't imagine that by pulling the connector on the A/C compressor you would get either of these codes. Have you checked for corrosion on the battery or proper battery voltage level? Here is a forum that may be of some help for trouble areas to look for (regarding P1633):
As far as P0511 goes if you notice any hooting type noise that is a sure indicator of a faulty IAC valve, if not then I would say first check that you do have proper output from your battery/alternator and then either take it to get properly diagnosed or try to check the circuit yourself.

Apr 12, 2011 | 2004 Ford Taurus

1 Answer

It has a cheek enigen on and give the code P1633

When the Taurus PCM (Powertrain Control Module)(aka "the car's computer"), sees 9V DC (or less),
it sets the code P1633, so it means your battery's voltage was low recently. But since the computer
retains the code until it is reset, the battery voltage may be OK now. This is typical for cars
that have sat for awhile, and the tiny current drain of the clock slowly drains the battery until
the voltage drops below 9 Volts. Normal car Battery voltage is 12 Volts.
Fix: check the battery (with a DMM (digital multimeter)), and reset the code (with a code reader).
Workaround: have Advance/Autozone/PepBoys check the battery (free) and ignore the code.

Jan 17, 2011 | 2002 Ford Taurus

1 Answer

2002 Taurus: 2002 taurus has p1633 code. what does it mean...

The code is for ( Keep Alive Power Voltage To Low ) Description: is the KAPWR has experienced a power interrupt. Possible problems: Open KAPWR circuit... Damaged PCM ...or a intermittent KAPWR circuit

May 18, 2010 | 2002 Ford Taurus

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