ACE - 0 - Taurus

Transcription

ACE - 0 - Taurus

1993 Ford Taurus V6-183 3.0L VIN U FI
Copyright © 2005, ALLDATA
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Computers and Control Systems: Testing and Inspection Procedures
DL - PFE/DPFE Sensor; EVR Solenoid Testing
PFE Sensor/EGR Vacuum Regulator Solenoid
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Delta PFE Sensor/EGR Vacuum Regulator Solenoid
DL - Testing Notes
NOTE: You should enter this Pinpoint Test only when you have been directed here from Quick Test.
REMEMBER
To prevent the replacement of good components, be aware that the following non-EEC areas may be at fault.
- Damaged EGR valve
- Restricted exhaust system
- Damaged vacuum reservoir or canister
This Pinpoint Test is intended to diagnose only the following:
- Harness circuits: VREF, PFE, DPFE, SIG RTN, EVR, VPWR
- PFE sensor
- DPFE sensor
- EVR solenoid
- EGR valve assembly
- Processor assembly
- Vacuum line/tubes (EVR, PFE/DPFE)
DESCRIPTION
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PFE/DPFE System
The Pressure Feedback EGR (PFE) system consists of a pressure sensor (PFE sensor), EGR Vacuum Regulator (EVR) solenoid, and a
vacuum actuated EGR valve. The Differential Pressure Feedback EGR (DPFE) system uses a differential pressure sensor (DPFE sensor)
which has two pressure inlets rather than one as in the PFE system.
In both type of systems, the EVR solenoid regulates a vacuum signal to the EGR valve in response to a duty cycle signal from the Powertrain
Control Module (PCM). The EVR solenoid will vent some of the source vacuum and transmit the remaining vacuum to the EGR valve in
response to the level of the duty cycle. The higher the duty cycle, the more vacuum is transmitted to the EGR valve. Due to the design of the
EVR solenoid, the available vacuum at the EGR valve never reaches the source vacuum level.
EGR flow rate is determined by monitoring the pressure across a fixed metering orifice as exhaust gasses pass through it. The DPFE system
monitors this flow across the orifice directly by supplying the DPFE sensor with a pressure signal before the orifice (upstream pressure) and
a pressure signal after the orifice (downstream pressure). The DPFE sensor then evaluates these two pressure inputs and determines the
pressure difference across the orifice. This pressure difference translates to a specific EGR flow which the DPFE sensor signals the PCM by
means of an analog voltage signal. This signal to the PCM increases linearly as the differential pressure increases. The PFE system, unlike
the DPFE system, has only one pressure signal input (downstream) and must rely on the PCM to indirectly infer the upstream exhaust
pressure in order to determine the EGR flow rate. The PFE sensor transmits an analog voltage signal which decreases linearly as EGR flow
increases.
With the feedback signal that either the PFE or DPFE sensors provide, the PCM can then optimize the EGR flow rate by varying the EVR
duty cycle.
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Schematic Diagram
Pinpoint Test DL1
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Pinpoint Test DL2
Pinpoint Test DL3
Pinpoint Test DL4
Pinpoint Test DL5
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Pinpoint Test DL6
Pinpoint Test DL7
Pinpoint Test DL8
Pinpoint Test DL9
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Pinpoint Test DL10
DL11 - Service Code 84/558: Measure EVR Solenoid Resistance
*** UPDATED BY TSB 9224B6 DATED 06-01-92
Pinpoint Test DL11
DL12 - Check VPWR Circuit Voltage
Pinpoint Test DL12
DL13 - Check EVR Circuit Continuity
Pinpoint Test DL13
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DL14 - Check EVR Circuit For Short to Power or Ground
Pinpoint Test DL14
Pinpoint Test DL20
Pinpoint Test DL21
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Pinpoint Test DL22
Pinpoint Test DL23
Pinpoint Test DL24
DL25 - Engine Running Codes 34/336 & 35/337
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Pinpoint Test DL25
DL26 - Check PFE Signal Voltage
Pinpoint Test DL26
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Pinpoint Test DL27
DL28 - Check PFE Harness Circuit For Shorts to Power
Pinpoint Test DL28
Pinpoint Test DL30
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Pinpoint Test DL31
Pinpoint Test DL34
Pinpoint Test DL35
Pinpoint Test DL36
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Pinpoint Test DL37
Pinpoint Test DL38
Pinpoint Test DL50
DL51 - Check DPFE Signal Voltage With Engine At Idle
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Pinpoint Test DL51
DL52 - Check EGR Valve For Binding
Pinpoint Test DL52
Pinpoint Test DL90
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Pinpoint Test DL91
Pinpoint Test DL92
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Pinpoint Test DL93
Pinpoint Test DL94
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Pinpoint Test DL95
Pinpoint Test DL96
Pinpoint Test DL97
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Pinpoint Test DL98
Pinpoint Test DL99
Pinpoint Test DL100
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Pinpoint Test DL101
Pinpoint Test DL102
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Pinpoint Test DL105
Pinpoint Test DL106
Pinpoint Test DL107
Page 20
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Pinpoint Test DL108
Page 21

ACE - 0 - Taurus

Transcription

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