P1408 & P1000 Codes
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Member
Joined: May 2002
Posts: 22
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From: Newnan, Ga.
P1408 & P1000 Codes
NEED HELP!!
A friend of mine has a 1997 F150 4.6V8, he is getting a P1408 trouble code. We replaced the DFPE and the EGR Valve with no help. Checked the VREF for the EVR and the EVM, there is voltage in the connectors and the resistance on EVR and EVM is within range. We checked the voltage on the DPFE connector, it to is within range. He tried to clear the codes and went to try to get it to pass emissions, of coarse it failed and the now he also has a P1000 code (OBDII Incomplete Test). We have access to Alldata Pro online through our employer and have as many test as we could with ohm meter, vaccum gage, and OBDII diagnostic checker. If anyone has any idea what it could be, we would greatly apprciate it.
Hope it is not the PCM!!!!!!!!!!!!!
Thanks Ken
A friend of mine has a 1997 F150 4.6V8, he is getting a P1408 trouble code. We replaced the DFPE and the EGR Valve with no help. Checked the VREF for the EVR and the EVM, there is voltage in the connectors and the resistance on EVR and EVM is within range. We checked the voltage on the DPFE connector, it to is within range. He tried to clear the codes and went to try to get it to pass emissions, of coarse it failed and the now he also has a P1000 code (OBDII Incomplete Test). We have access to Alldata Pro online through our employer and have as many test as we could with ohm meter, vaccum gage, and OBDII diagnostic checker. If anyone has any idea what it could be, we would greatly apprciate it.
Hope it is not the PCM!!!!!!!!!!!!!
Thanks Ken
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Joined: Oct 2002
Posts: 7,295
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From: St. Louis (Out in the woods)
The P1000 code is due to the recent reset. The computer must have a specific amount of driving time in order to execute all the self-tests.
If you have access to the Alldata Pro system, you should be following the instructions on how to diagnose the P1408 code. They should be in there. If they are not, you will need to consult the Ford PC/ED for your engine. The PC/ED has a step-by-step procedure to isolate the cause of the code.
FWIW here is the list of possible causes:
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Diagnostic Trouble Code (DTC) P1408 indicates that Key On Engine Running (KOER) Self-Test has detected EGR flow out of range.
Possible causes:
-- Fault in vacuum supply to EGR vacuum regulator solenoid.
-- EGR valve stuck closed or iced.
-- EGR valve diaphragm leaks.
-- EGR valve or flow path restricted.
-- EGR vacuum hose off, plugged or leaks.
-- VPWR circuit open to EGR vacuum regulator solenoid.
-- EGRVR circuit to PCM open.
-- EGRVR circuit to PCM shorted to PWR.
-- Differential Pressure Feedback EGR (D.P.F. EGR) sensor pressure hoses both improperly connected.
-- D.P.F. EGR sensor pressure hoses reversed.
-- D.P.F. EGR sensor VREF circuit open.
-- Improper downstream pressure hose connection.
-- Downstream pressure hose plugged.
-- Damaged orifice tube assembly.
-- Damaged EGR vacuum regulator solenoid.
-- Damaged D.P.F. EGR sensor.
-- Damaged PCM.
NOTE:
If any DTC other than DTC P1406 is output, record DTC and refer to Diagnostic Trouble Code Charts in «Section 4A» after completing this Pinpoint Test.
l Retrieve all Continuous Memory DTCs.
l Is DTC P1406 output?
Yes
GO to «HE60».
No
GO to «HE72».
HE72 RUN KOER SELF-TEST WHILE MONITORING EGR VACUUM
l Disconnect vacuum hose at EGR valve and connect hose to a vacuum gauge.
l NOTE:
Since the EGR vacuum hose is disconnected, ignore DTCs during this KOER Self-Test.
Run Key On Engine Running (KOER) Self-Test while monitoring gauge. Approximately 30 seconds into test, EGR flow will be requested for a few seconds. The vacuum at this time should increase above 5.4 kPa (1.6 in-Hg) to open the valve.
l Key off.
l Did the vacuum increase to 10 kPa (3.0 in-Hg) or greater at any time during KOER Self-Test?
Yes
The vacuum indicated is sufficient to open the EGR valve. Fault is unlikely to be in EGR vacuum control system. GO to «HE73».
No
The vacuum indicated is insufficient to open the EGR valve. GO to «HE80».
////
If you need further steps posted let us know.
Steve
If you have access to the Alldata Pro system, you should be following the instructions on how to diagnose the P1408 code. They should be in there. If they are not, you will need to consult the Ford PC/ED for your engine. The PC/ED has a step-by-step procedure to isolate the cause of the code.
FWIW here is the list of possible causes:
////
Diagnostic Trouble Code (DTC) P1408 indicates that Key On Engine Running (KOER) Self-Test has detected EGR flow out of range.
Possible causes:
-- Fault in vacuum supply to EGR vacuum regulator solenoid.
-- EGR valve stuck closed or iced.
-- EGR valve diaphragm leaks.
-- EGR valve or flow path restricted.
-- EGR vacuum hose off, plugged or leaks.
-- VPWR circuit open to EGR vacuum regulator solenoid.
-- EGRVR circuit to PCM open.
-- EGRVR circuit to PCM shorted to PWR.
-- Differential Pressure Feedback EGR (D.P.F. EGR) sensor pressure hoses both improperly connected.
-- D.P.F. EGR sensor pressure hoses reversed.
-- D.P.F. EGR sensor VREF circuit open.
-- Improper downstream pressure hose connection.
-- Downstream pressure hose plugged.
-- Damaged orifice tube assembly.
-- Damaged EGR vacuum regulator solenoid.
-- Damaged D.P.F. EGR sensor.
-- Damaged PCM.
NOTE:
If any DTC other than DTC P1406 is output, record DTC and refer to Diagnostic Trouble Code Charts in «Section 4A» after completing this Pinpoint Test.
l Retrieve all Continuous Memory DTCs.
l Is DTC P1406 output?
Yes
GO to «HE60».
No
GO to «HE72».
HE72 RUN KOER SELF-TEST WHILE MONITORING EGR VACUUM
l Disconnect vacuum hose at EGR valve and connect hose to a vacuum gauge.
l NOTE:
Since the EGR vacuum hose is disconnected, ignore DTCs during this KOER Self-Test.
Run Key On Engine Running (KOER) Self-Test while monitoring gauge. Approximately 30 seconds into test, EGR flow will be requested for a few seconds. The vacuum at this time should increase above 5.4 kPa (1.6 in-Hg) to open the valve.
l Key off.
l Did the vacuum increase to 10 kPa (3.0 in-Hg) or greater at any time during KOER Self-Test?
Yes
The vacuum indicated is sufficient to open the EGR valve. Fault is unlikely to be in EGR vacuum control system. GO to «HE73».
No
The vacuum indicated is insufficient to open the EGR valve. GO to «HE80».
////
If you need further steps posted let us know.
Steve
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Member
Joined: May 2002
Posts: 22
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From: Newnan, Ga.
Thank you for the info. We tried most of that list with the limited test equipment we had, no help.
We removed the throttle body and foung the ports for the EGR sensor were completely blocked. Cleaned them out, and within 9miles of driving the truck, both codes cleared themselves.
I think this is the first time I have ever seen a code come up and it was actually a problem with the truck and not a faulty sensor. Again thank you for your help. Ken
We removed the throttle body and foung the ports for the EGR sensor were completely blocked. Cleaned them out, and within 9miles of driving the truck, both codes cleared themselves.
I think this is the first time I have ever seen a code come up and it was actually a problem with the truck and not a faulty sensor. Again thank you for your help. Ken