Advertisement [ ? ]
Site Links
- Lease Calculator
- Advertise on 11,500+ pages
- My Car ongoing Review
- Members' Chat
- Cars For Sale
- Car Dealers
- Honda "Fit" Manual
- Hyperflex Bushings
- For Sale
- Fix your Car
- Car Manuals
- other manuals - Reference Materials
- DIY Repairs
- Articles
- Video
- Link with Us
- Search Help
- Code your Mac!
- Fly, race, anything R/C
- DIY repair guides
- Z-Seven
- Mechanic's Blog
- Free Files
I got a P1633 OBD code
Car: Ford, Taurus SE, 2005, 3.0 - Back to Fix-It - Ford Repair Manuals
Q.I got a P1633 (Keep Alive Power Voltage Too Low) OBD code and at the same time, my air conditioning stopped producing cold air on my 2003 Taurus SES. There was a blown fuse in the 22 position (A/C Clutch Relay). Also there is a funny noise like something is running rough in the vicinity of the Alternator/ A/C unit when the car is first started. This noise then dies down as the car sits while running. What''s wrong?
Answer Good afternoon and thank you for inquiring with CRXSi.Com, my name is Dustin and i will be the technician assisting you today. Most likely based on the description you have provided me, you have a bad a/c compressor or pulley causing this noise, this is very common on the taurusses and i have seen this concern blow the fuse due to the excess load put on the system causing the fuse to possibly blow. It is hard to tell without physically seeing the vehicle but i would start with removing the serpentine belt and spinning each pully individually and check for any wind up or binding. When you check the compressor make sure you spin the pulley as well as the clutch disc as the pulley might still be good but the compressor could be seized. Also make sure the a/c clutch disc isn't loose and broken away from its rubber mounts, this is also fairly common and could cause noise as well. As for the P1633, i would first start with having the battery tested to make sure it has sufficient cold cranking amps. I have listed below the appropriate pinpoint test for P1633 for you to review and assist you in diagnosing the reason the code set.
P1633 - Keep Alive Power Voltage Too Low
Description: Indicates the keep alive power (KAPWR) circuit has experienced a voltage interrupt.
Possible Causes:
Open KAPWR circuit
Intermittent KAPWR
Diagnostic Aids: Loss of KAPWR to the 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 QB1 .
QB1 CHECK THE 12-VOLT BATTERY TERMINALS
Note: If KAPWR is interrupted to the PCM when a breakout box is installed or the battery is disconnected, DTC P0603/P1633 can be generated on the first power-up.
Inspect the 12-volt battery cables for loose connections and for corrosion.
Are the 12-volt battery terminal connections in good condition?
Yes No
GO to QB2 . REPAIR as necessary.
QB2 INSPECT THE ENGINE COMPARTMENT FOR PROPER WIRE ROUTING
Inspect the electronic engine control (EEC) system wiring for proper wire routing.
Check the wiring routing to establish if any of the electrical connectors are being stressed due to poorly routed wiring. If necessary re-route and secure the wiring.
Visually inspect wiring and connectors.
Is a concern present?
Yes No
REPAIR as necessary. GO to QB3 .
QB3 CHECK KEEP ALIVE POWER (KAPWR) TO THE PCM
Key in OFF position.
PCM connector disconnected.
Measure the voltage between:
( + ) PCM Connector, Harness Side ( - ) 12 Volt Vehicle Battery
KAPWR Negative terminal
While observing the multimeter, grasp the EEC harness and wiggle, shake or bend a small section while working from the battery to the PCM.
Is the voltage greater than 10.5 V?
Yes No
GO to QB4 . ISOLATE the fault and REPAIR as necessary.
QB4 CHECK FOR A REPEAT OF THE DTC
PCM connector connected.
Clear all DTCs that may have been caused by the PCM disconnect.
Test drive the vehicle and allow the engine to reach normal operating temperature.
Carry out the PCM self-test.
Is DTC P0603 or P1633 present?
Yes No
INSTALL a new PCM. REFER to Section 2, Flash Electrically Erasable Programmable Read Only Memory (EEPROM). Unable to duplicate or identify the fault at this time.
Addition once the car is started, it wont stay running it immediately shuts off, all other problems persist, also the power steering is like overflowing.
Answer Thank you for the additional information, First check your vehicles charging system and make sure the voltage at both battery posts is 13.5 to 14.7 volts, if not then you might have an alternator that failed, and that would definately be a cause of the dtc.
Also test the battery to ensure the alternator didn't drain the battery far enough to where it will not hold a charge anymore. If the alternator / and possibly the battery failed, then replace the alternator.
If the serpentine belt is not on the accessory drive system then one of the pulleys might have failed, or as mentioned the compressor could have seized, and with no accessory drive belt installed the alternator as well as power steering pump will not spin resulting in a loss of charging from the alternator as well as the loss of power steering.
Addition the car has a new alternator and battery. That was my fist thought but still wont run.
Answer the serpentine belt is installed properly i take it? Please check the belt routing below to ensure the belt is properly installed, if so i would like you to test the charging system voltage and advise me what voltage the battery is reading while the engine is running
Item Part Number Description
1 10346 Generator pulley
2 8678 Belt idler pulley
3 3A733 Power steering pump pulley
4 8620 Drive belt
5 19D784 A/C clutch pulley
6 6B209 Drive belt tensioner pulley
7 6A312 Crankshaft pulley
8 8A528 Coolant pump pulley
Component Locations 3.0L (4V)
Item Part Number Description
1 3A733 Power steering pump pulley
2 8620 Drive belt
3 19D784 A/C clutch pulley
4 6A312 Crankshaft pulley
5 6B209 Drive belt tensioner pulley
6 10344 Generator pulley.
Addition the only way the car will run, if i keep it alive with my foot on the gas. Still check the voltage.
More Info required usually if you must hold the gas pedal to keep it running it is a bad IAC valve, was the P1633 the only code that was stored in the PCM? You might have more issues compounded causing this concern. I would first like you to ensure all fuses, both inside as well as underhood are good, then check the charging system voltage.
>>Contribute your Answer<< - Submit your Question