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2003 FORD EXPEDITION 4.6l electrical issue,
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paul bertsche
New User
Aug 16, 2015, 4:51 PM
Post #1 of 4
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2003 FORD EXPEDITION 4.6l electrical issue,
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2003 ford expedition, 4.6L, auto, the battery light is on and it gives check charging system message when accelerating, as well as very low or no idle, changed alternator, and battery with no improvement, now vehicle cranks strong but wont start, and now has lost fuel pressure (no pressure), have checked the inputs at pcm for fuel pump and charging they are getting signal to pcm and out put for starter relay has power , HELP
(This post was edited by paul bertsche on Aug 16, 2015, 4:54 PM)
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Discretesignals
Ultimate Carjunky
/ Moderator
Aug 16, 2015, 5:08 PM
Post #2 of 4
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Re: 2003 FORD EXPEDITION 4.6l electrical issue,
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Fuel pump isn't an input for the PCM. The PCM controls the fuel pump relay which is used to complete the circuit to the fuel pump.
Worthless to check the charging system if you can get the engine to start and run.
When you installed this alternator did you have any mishaps such as shorting the bat cable cause you forgot to disconnect the battery or reversing battery connections somehow? Do you have a code reader to see if you can access the PCM and retrieve codes?
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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paul bertsche
New User
Aug 17, 2015, 2:38 PM
Post #3 of 4
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Re: 2003 FORD EXPEDITION 4.6l electrical issue,
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I understand fuel pump not input.I was generalizing my pinpoint tests, yes I have a scanner, no codes present active or previous, vehicle ran for a couple days . Had alternator tested on vehicle tested good ,replaced battery, light never went out. Check charging message never went out, alternator putting out 14.3 volts, loss of fuel pressure new symptoms, please understand I'm a pro mechanic, looking for assistance with an issue I have not encountered previously, starting to believe it's the central fuse relay panel
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Double J
Veteran
/ Moderator
Aug 17, 2015, 3:24 PM
Post #4 of 4
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Re: 2003 FORD EXPEDITION 4.6l electrical issue,
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Have you checked for any TSB's?
Found this one, MAY apply to your concern.TSB
04-14-9DIAGNOSTIC TROUBLE CODE (DTC) P0320 WITH POSSIBLE DRIVEABILITY CONCERNS AND/OR CHARGING SYSTEM WARNING INDICATOR ON WITH POSSIBLE DTC P0620 Publication Date: July 8, 2004
FORD:2003-2004 ExpeditionLINCOLN:2003-2004 Navigator
ISSUE:
Some 2003-2004 Expedition/Navigator vehicles may exhibit the following symptoms in any combination:- Intermittent Driveability Concerns
- Intermittent Flickering Of The Charging System Warning Indicator
- Malfunction Indicator Lamp (MIL) On With DTC's P0620 And/Or P0320 In Memory
These conditions may be caused either by chafing or corrosion of the 14305 harness, or an interaction of the PCM with the charging system. ACTION:
Check the vehicle build date to select the appropriate Service Procedure.SERVICE PROCEDURE
Vehicles built before 4/2/04: Reprogram PCM to the latest calibration using WDS release B32.2 or higher, and replace the 14305 harness. Apply a very light coat of electrical grease (F8AZ-19G208-AA) on the male pins of the alternator/regulator (C102A connection), and the pins of C192A on the 14305 harness (see Note).
Replace the 14305 harness as follows: - Expedition built 3/18/02 - 1/31/03: 2L1Z-14305-AB
- Expedition built after 2/1/03: 3L1Z-14305-AB
- Navigator built 3/18/02 - 1/31/03: 2L7Z-14305-AB
- Navigator built after 2/1/03: 3L7Y-14305-AB
NOTE:BEFORE APPLYING GREASE TO A NEW SERVICE HARNESS, CHECK THE ENGINEERING PART NUMBER. HARNESSES WITH ENGINEERING PART NUMBER 2L1T-AL, 2L7T-AL, 4L1T-AC, OR 4L7T-AC (OR WITH HIGHER SUFFIXES) ALREADY CONTAIN ELECTRICAL GREASE AND NO ADDITIONAL ELECTRICAL GREASE IS NECESSARY. DO NOT OVERAPPLY GREASE, AS TERMINAL DAMAGE MAY RESULT.
Vehicles built from 4/2/04 to 6/14/04: Reprogram PCM to the latest calibration using WDS release B32.2 or higher, and apply a very light coat of electrical grease on the male pins of the alternator/regulator (C102A connection), and the pins of C192A on the 14305 harness (see prior Note).
Vehicles built from 6/15/04 to 7/19/04: Only reprogram PCM to the latest calibration using WDS release B32.2 or higher.
NOTE:VEHICLES BUILT AFTER 4/2/04 HAVE A PROTECTIVE SLEEVE ON THE 14305 HARNESS. VEHICLES BUILT AFTER 6/14/04 ALREADY HAVE GREASE IN THE 14305 HARNESS CONNECTORS.
NOTE:DO NOT REPLACE THE ALTERNATOR UNLESS INDICATED BY WORKSHOP MANUAL DIAGNOSTICS.
LABOR OPERATION CLAIMING CHARTOperationLabor DescriptionApplicationTime041409AVehicles Built Before 6/15/04: Check for codes, update the PCM calibration, and replace the 14305 harness if necessary. Apply a very light coat of electrical grease on the male pins of the alternator/regulator (C102A connection), and the pins of C192A on the 14305 harness.Expedition
Navigator
0.6 Hr.
1.4 Hrs.
041409BVehicles Built From 6/15/04 To 7/19/04: Check for codes update the PCM calibration only.Expedition
Navigator
0.4 Hr.
0.4 Hr.
PART NUMBERPART NAME2L1Z-14305-ABHarness2L7Z-14305-ABHarness3L1Z-14305-AB Harness3L7Y-14305-ABHarnessF8AZ-19G208-AAElectrical Grease
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