Petericaza

Member
Dec 3, 2019
66
2
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48
San jose
I changed my pcm and now I get a new set of codes thrown by the pcm would you guys be able to help me fix this?
 

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wmburns

SN Certified Technician
Aug 14, 2009
5,842
505
194
Houston Texas
The P0080 DTC is a DTC code that would be expected to occur on a motor with variable cam timing. The problem is that a 1999-2004 GT does NOT have variable cam timing.

Are you positive the replacement PCM is for a SOHC 4.6 GT 1999-2004?
 

Petericaza

Member
Dec 3, 2019
66
2
8
48
San jose
I checked again the code was pending it went away however the p0460 codes that were pending are now current codes and yes the pcm came from a 2002 gt
 

wmburns

SN Certified Technician
Aug 14, 2009
5,842
505
194
Houston Texas
Whenever a DTC calls out a "circuit Malfunction" it means there's something so wrong with the basic circuit that the PCM is unable to perform any diagnosis. Think Open, short, ground fault, wiring, or a bad sensor.

Since the fuel level sensor worked (I assume) previously we should assume that the fuel level sensor is good. Suggest starting by double checking the PCM connector for bent/pushed pins. Then monitor the FLI PID.

But since a damaged cluster is one of the possible "causes", given the other problems you are having with the cluster, this may be a great place to start.

>>
P0460 - Fuel Level Sensor Circuit Malfunction
The PCM monitors the fuel level input (FLI) circuit for electrical failure. The test fails when the signal moves outside the minimum or maximum allowable calibrated parameters for a specified fuel fill percentage in the fuel tank.
  • Empty fuel tank
  • Fuel pump (FP) module stuck open
  • Incorrectly installed fuel gauge
  • Damaged instrument cluster
  • CASE GND circuit open
  • FLI shorted to VPWR
  • Damaged PCM
  • Overfilled fuel tank
  • Fuel pump (FP) module stuck closed
  • Damaged fuel gauge
  • FLI circuit open
  • FLI circuit shorted to CASE GND or PWR GND
  • CSE GND shorted to VPWR
Monitor FLI PID and FLI V PID in key ON engine RUNNING. FLI PID at 25% fill (with non matching fuel gauge) and FLI V PID less than 0.90 volts [for FLI PID at 75% fill (with non matching fuel gauge) and FLI V PID greater than 2.45 volts] indicates a hard fault​
 

Petericaza

Member
Dec 3, 2019
66
2
8
48
San jose
Whenever a DTC calls out a "circuit Malfunction" it means there's something so wrong with the basic circuit that the PCM is unable to perform any diagnosis. Think Open, short, ground fault, wiring, or a bad sensor.

Since the fuel level sensor worked (I assume) previously we should assume that the fuel level sensor is good. Suggest starting by double checking the PCM connector for bent/pushed pins. Then monitor the FLI PID.

But since a damaged cluster is one of the possible "causes", given the other problems you are having with the cluster, this may be a great place to start.

>>
P0460 - Fuel Level Sensor Circuit Malfunction
The PCM monitors the fuel level input (FLI) circuit for electrical failure. The test fails when the signal moves outside the minimum or maximum allowable calibrated parameters for a specified fuel fill percentage in the fuel tank.
  • Empty fuel tank
  • Fuel pump (FP) module stuck open
  • Incorrectly installed fuel gauge
  • Damaged instrument cluster
  • CASE GND circuit open
  • FLI shorted to VPWR
  • Damaged PCM
  • Overfilled fuel tank
  • Fuel pump (FP) module stuck closed
  • Damaged fuel gauge
  • FLI circuit open
  • FLI circuit shorted to CASE GND or PWR GND
  • CSE GND shorted to VPWR
Monitor FLI PID and FLI V PID in key ON engine RUNNING. FLI PID at 25% fill (with non matching fuel gauge) and FLI V PID less than 0.90 volts [for FLI PID at 75% fill (with non matching fuel gauge) and FLI V PID greater than 2.45 volts] indicates a hard fault​

I’m fairly new to this is there a way to dumb it down for me