1991 1999 ford explorer chilton User Manual

5.0L ENGINE (1 OF 3)
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COMPONENT LOCATIONS 577 

5.0L ENGINE (2 OF 3)
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578 COMPONENT LOCATIONS 

5.0L ENGINE (3 OF 3)
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Chilton® Automotive Information Systems. © 2004 Thomson Delmar Learning. HOW TO USE THIS BOOK
COMPONENT LOCATIONS 579 

TROUBLE CODES
General Description
Ford Ranger/Explorer and Mountaineer vehicles employ the Electronic Engine Control (EEC) system, to
manage fuel, ignition and emissions on vehicle engines.
The Powertrain Control Module (PCM) is given responsibility for the operation of the emission control
devices, cooling fans, ignition and advance and in some cases, automatic transmission functions. Because the
EEC oversees both the ignition timing and the fuel injector operation, a precise air/fuel ratio will be...

FAILURE MODE EFFECTS MANAGEMENT (FMEM)
The engine controller assembly contains back-up programs which allow the engine to operate if a sensor
signal is lost. If a sensor input is seen to be out of range-either high or low-the FMEM program is used. The
processor substitutes a fixed value for the missing sensor signal. The engine will continue to operate, although
performance and driveability may be noticeably reduced. This function of the controller is sometimes referred
to as the limp-in or fail-safe...

To access the diagnostic connector, unfasten it from its protective cover, which is labeled EEC
TEST
Reading Codes
Inexpensive scan tools, such as this Auto Xray®, are available to interface with your Ford vehicle
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Diagnostic Connector 583 

When using a scan tool, make sure to follow all of the manufacturers instructions carefully to
ensure proper diagnosis
EEC-V EQUIPPED ENGINES
The EEC-V equipped engines utilize On Board Diagnostic II (OBD-II) Diagnostic Trouble Codes (DTCs),
which are alpha-numeric (they use letters and numbers). The letters in the OBD-II DTCs make it highly
difficult to convey the codes through the use of anything but a scan tool. Therefore, to read the OBD-II DTCs
on these vehicles it is necessary to utilize an OBD-II...

(DTCs) are two or three digit numbers, and can be read through the use of a scan tool, an analog voltmeter, or
with the Malfunction Indicator Lamp (MIL) located on the instrument cluster. Use the accompanying OBD-I
DTC charts to decipher the DTCs for the identification of the malfunctioning component or circuit.
Scan Tool Method Connect the scan tool to the self-test connectors. Make certain the test button is unlatched or up.
1. 
Start the engine and run it until normal operating temperature is...

Clearing Codes
CONTINUOUS MEMORY CODES
These codes are retained in memory for 40 warm-up cycles. To clear the codes for the purposes of testing or
confirming repair, perform the code reading procedure. When the fault codes begin to be displayed,
de-activate the test by either disconnecting the jumper wire (meter, MIL or message center) or releasing the
test button on the hand scanner. Stopping the test during code transmission will erase the Continuous
Memory. Do not disconnect the negative battery...

OBD-II DIAGNOSTIC TROUBLE CODE (DTC) APPLICATIONS
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Diagnostic Trouble Code Charts 587