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I went through hell getting rid of a P1407 and P0402 (EGR flow excessive) so I took the upper intake assemply off my old engine with the sensors for the EGR still on it and swapped it. The codes stopped for a week but now I'm got P1401 on my hands and I don't know what it means but my guess is it's EGR related. Thanks for any advice and wisdom in advance, I really appreciate it.
 

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HMMMM.... this strange.....


1994 PCED OBDII SECTION 1: Description and Operation

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Diagnostic Trouble Code (DTC) Definitions
DTC Definitions
P0102 Mass Air Flow (MAF) sensor circuit low input
P0103 Mass Air Flow (MAF) sensor circuit high input
P0112 Intake Air Temperature (IAT) sensor circuit low input
P0113 Intake Air Temperature (IAT) sensor circuit high input
P0117 Engine Coolant Temperature (ECT) sensor circuit low input
P0118 Engine Coolant Temperature (ECT) sensor circuit high input
P0122 Throttle Position (TP) sensor circuit low input
P0123 Throttle Position (TP) sensor circuit high input
P0125 Insufficient Coolant Temperature to enter closed loop fuel control
P0132 Upstream Heated Oxygen sensor (HO2S 11) circuit high voltage (Bank #1)
P0135 Heated Oxygen sensor heater (HTR 11) circuit malfunction
P0138 Downstream Heated Oxygen sensor (HO2S 12) circuit high voltage (Bank #1)
P0140 Heated Oxygen sensor (HO2S 12) circuit no activity detected (Bank #1)
P0141 Heated Oxygen sensor heater (HTR 12) circuit malfunction
P0152 Upstream Heated Oxygen sensor (HO2S 21) circuit high voltage (Bank #2)
P0155 Heated Oxygen sensor heater (HTR 21) circuit malfunction
P0158 Downstream Heated Oxygen sensor (HO2S 22) circuit high voltage (Bank #2)
P0160 Heated Oxygen sensor (HO2S 22) circuit no activity detected (Bank #2)
P0161 Heated Oxygen sensor heater (HTR 22) circuit malfunction
P0171 System (adaptive fuel) too lean (Bank #1)
P0172 System (adaptive fuel) too rich (Bank #1)
P0174 System (adaptive fuel) too lean (Bank #2)
P0175 System (adaptive fuel) too rich (Bank #2)
P0300 Random Misfire detected
P0301 Cylinder #1 Misfire detected
P0302 Cylinder #2 Misfire detected
P0303 Cylinder #3 Misfire detected
P0304 Cylinder #4 Misfire detected
P0305 Cylinder #5 Misfire detected
P0306 Cylinder #6 Misfire detected
P0307 Cylinder #7 Misfire detected
P0308 Cylinder #8 Misfire detected
P0320 Ignition Engine Speed (Profile Ignition Pickup (PIP)) input circuit malfunction
P0340 Camshaft Position (CMP) sensor circuit malfunction (CID)
P0402 Exhaust Gas Recirculation (EGR) flow excess detected (valve open at idle)
P0420 Catalyst system efficiency below threshold (Bank #1)
P0430 Catalyst system efficiency below threshold (Bank #2)
P0443 Evaporative emission control system Canister Purge Control Valve (CANP) circuit malfunction
P0500 Vehicle Speed Sensor (VSS) malfunction
P0505 Idle Air Control (IAC) system malfunction
P0605 Powertrain Control Module (PCM) - Read Only Memory (ROM) test error
P0703 Brake On/Off switch (BOO) input malfunction
P0707 Manual Lever Position (MLP) sensor circuit low input
P0708 Manual Lever Position (MLP) sensor circuit high input
P0720 Output Shaft Speed (OSS) sensor circuit malfunction
P0741 Torque Converter Clutch (TCC) system incorrect mechanical performance
P0743 Torque Converter Clutch (TCC) system electrical failure
P0750 Shift Solenoid #1 (SS1) circuit malfunction
P0751 Shift Solenoid #1 (SS1) performance
P0755 Shift Solenoid #2 (SS2) circuit malfunction
P0756 Shift Solenoid #2 (SS2) performance
P1000 OBD II Monitor Testing not complete
P1100 Mass Air Flow (MAF) sensor intermittent
P1101 Mass Air Flow (MAF) sensor out of Self-Test range
P1112 Intake Air Temperature (IAT) sensor intermittent
P1116 Engine Coolant Temperature (ECT) sensor out of Self-Test range
P1117 Engine Coolant Temperature (ECT) sensor intermittent
P1120 Throttle Position (TP) sensor out of range low
P1121 Throttle Position (TP) sensor inconsistent with MAF sensor
P1124 Throttle Position (TP) sensor out of Self-Test range
P1125 Throttle Position (TP) sensor circuit intermittent
P1130 Lack of HO2S 11 switch, adaptive fuel at limit
P1131 Lack of HO2S 11 switch, sensor indicates lean (Bank #1)
P1132 Lack of HO2S 11 switch, sensor indicates rich (Bank #1)
P1137 Lack of HO2S 12 switch, sensor indicates lean (Bank #1)
P1138 Lack of HO2S 12 switch, sensor indicates rich (Bank #1)
P1150 Lack of HO2S 21 switch, adaptive fuel at limit
P1151 Lack of HO2S 21 switch, sensor indicates lean (Bank #2)
P1152 Lack of HO2S 21 switch, sensor indicates rich (Bank #2)
P1157 Lack of HO2S 22 switch, sensor indicates lean (Bank #2)
P1158 Lack of HO2S 22 switch, sensor indicates rich (Bank #2)
P1351 Ignition Diagnostic Monitor (IDM) circuit input malfunction
P1352 Ignition coil A primary circuit malfunction
P1353 Ignition coil B primary circuit malfunction
P1354 Ignition coil C primary circuit malfunction
P1355 Ignition coil D primary circuit malfunction
P1364 Ignition coil primary circuit malfunction
P1390 Octane Adjust (OCT ADJ) out of Self-Test range
P1400 Differential Pressure Feedback Electronic (DPFE) sensor circuit low voltage detected
P1401 Differential Pressure Feedback Electronic (DPFE) sensor circuit high voltage detected
P1403 Differential Pressure Feedback Electronic (DPFE) sensor hoses reversed
P1405 Differential Pressure Feedback Electronic (DPFE) sensor upstream hose off or plugged
P1406 Differential Pressure Feedback Electronic (DPFE) sensor downstream hose off or plugged
P1407 Exhaust Gas Recirculation (EGR) no flow detected (valve stuck closed or inoperative)
P1408 Exhaust Gas Recirculation (EGR) flow out of Self-Test range
P1473 Fan Secondary High with Fan(s) Off
P1474 Low Fan Control primary circuit malfunction
P1479 High Fan Control primary circuit malfunction
P1480 Fan Secondary Low with Low Fan On
P1481 Fan Secondary Low with High Fan On
P1500 Vehicle Speed Sensor (VSS) circuit intermittent
P1505 Idle Air Control (IAC) system at adaptive clip
P1605 Powertrain Control Module (PCM) - Keep Alive Memory (KAM) test error
P1703 Brake On/Off (BOO) switch out of Self-Test range
P1705 Manual Lever Position (MLP) sensor out of Self-Test range
P1711 Transmission Fluid Temperature (TFT) sensor out of Self-Test range
P1742 Torque Converter Clutch (TCC) solenoid mechanically failed on (turns on MIL)
P1743 Torque Converter Clutch (TCC) solenoid mechanically failed on (turns on TCIL)
P1744 Torque Converter Clutch (TCC) system mechanically stuck in off position
P1746 Electronic Pressure Control (EPC) solenoid circuit low input (open circuit)
P1747 Electronic Pressure Control (EPC) solenoid circuit high input (short circuit)
P1751 Shift Solenoid #1 (SS1) performance
P1756 Shift Solenoid #2 (SS2) performance
P1780 Transmission Control Switch (TCS) circuit out of Self-Test range

That one is not listed... things to check for your egr system is the ports under the upper intake... dpfe... egvr...hoses to dpfe. If you could drive to houma on a saturday i could probably put it on the WDS (if they still let me use the equipment at my former employee) Let me know if your interested.
 

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<stupid question> What is the EGR...something to do with the exhasut gases, and for that matter what is the IAT...sorry to take away fromt he post...dont hurt me!!??</stupid question>
 

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tbirdracer97 said:
<stupid question> What is the EGR...something to do with the exhasut gases, and for that matter what is the IAT...sorry to take away fromt he post...dont hurt me!!??</stupid question>
Basic description.......


1997 PCED OBDII-A SECTION 1A: Description and Operation

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Exhaust Gas Recirculation (EGR) System Monitor— Differential Pressure Feedback EGR
The Differential Pressure Feedback EGR System Monitor is an on-board strategy designed to test the integrity and flow characteristics of the EGR system. The monitor is activated during EGR system operation and after certain base engine conditions are satisfied. Input from the ECT, IAT, TP and CKP sensors is required to activate the EGR System Monitor. Once activated, the EGR System Monitor will perform each of the tests described below during the engine modes and conditions indicated. Some of the EGR System Monitor tests are also performed during on demand self-test.

The Differential Pressure Feedback EGR sensor and circuit are continuously tested for opens and shorts. The monitor looks for the Differential Pressure Feedback EGR circuit voltage to exceed the maximum or minimum allowable limits.

The DTCs associated with this test are DTCs P1400 and P1401.
The EGR Vacuum Regulator solenoid is continuously tested for opens and shorts. The monitor looks for an EGR Vacuum Regulator circuit voltage that is inconsistent with the EGR Vacuum Regulator circuit commanded output state.

The DTC associated with this test is DTC P1409.
The test for a stuck open EGR valve or EGR flow at idle is continuously performed whenever at idle (TP sensor indicating closed throttle). The monitor compares the Differential Pressure Feedback EGR circuit voltage at idle to the Differential Pressure Feedback EGR circuit voltage stored during key on engine off to determine if EGR flow is present at idle.

The DTC associated with this test is DTC P0402.
The Differential Pressure Feedback EGR sensor upstream hose is tested once per drive cycle for disconnect and plugging. The test is performed with EGR valve closed and during a period of acceleration. The PCM will momentarily command the EGR valve closed. The monitor looks for the Differential Pressure Feedback EGR sensor voltage to be inconsistent for a no flow voltage. A voltage increase or decrease during acceleration while the EGR valve is closed may indicate a fault with the signal hose during this test.

The DTC associated with this test is DTC P1405.
The EGR flow rate test is performed during a steady state when engine speed and load are moderate and EGR Vacuum Regulator duty cycle is high. The monitor compares the actual Differential Pressure Feedback EGR circuit voltage to a desired EGR flow voltage for that state to determine if EGR flow rate is acceptable or insufficient. This is a system type test and may trigger a DTC for any fault causing the EGR system to fail.

The DTC associated with this test is DTC P0401.
DTC P1408 is similar to P0401 but performed during KOER Self-Test conditions.
The MIL is activated after one of the above tests fail on two consecutive drive cycles.



The IAT (intake air temperature) is a variable resistor that changes according to the temperature. The pcm takes the resistance and uses it for driveability purposes. such as fuel usage, bc cold air is denser and thus has more oxygen in it. Ever wonder why your car runs better when its cold out?
 

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Discussion Starter #5
It is under that list:

P1401 Differential Pressure Feedback Electronic (DPFE) sensor circuit high voltage detected

Now looking at what steps I already took, does the change in code mean that the EGR valve itself is ok and it's a sensor problem? I don't quite understand how to decifer all this and what part is the DPFE, the black plastic sensor with vacuum hoses or aluminum sensor hosed' up to the EGR tube?
 

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Silver sensor against the firewall .... yours is more of a PITA than the 96-97 positions.
Generic part # is XXX-9j460-XX. The black sensor is most probably the EGVR (controled by the pcm) the allows vacuum to open or close the egr. The wrong reading from the dpfe sensor can cause the codes.... over time condensation causes the aluminum to corrode and inhibit the sensor ability to read properly.
 
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