EEC-V Components And What They Do

The electronic engine controls consist of the:

 
-powertrain control module (PCM) (12A650).
-throttle position sensor (TP sensor) (9B989).
-idle air control valve (IAC valve) (9F715).
-engine coolant temperature sensor (ECT sensor) (12A648).
-camshaft position sensor (CMP sensor) (6B288)
-4.2L vehicles - camshaft synchronizer.
-4.6L, 5.4L vehicles – camshaft position sensor.
-crankshaft position sensor (CKP sensor) (6C315).
-mass air flow sensor (MAF sensor) (12B579).
-intake air temperature sensor (IAT sensor) (12A697).
-heated oxygen sensor (HO2S) (9F472).
-knock sensor (KS) (12A699) (4.6L, 5.4L).
-vehicle speed sensor (VSS) (9E731).
-cylinder head temperature (CHT) sensor (6G004).
 
 
The powertrain control module needs the following inputs to calibrate the engine properly:
 
-camshaft position.
-engine rpm.
-engine coolant temperature.
-amount of engine detonation.
 
 
The throttle position sensor :
 
-sends the powertrain control module a signal indicating the throttle plate angle.
-is the main input to the powertrain control module from the driver.
 
 
The idle air control valve 4.6L, 5.4L:
 
-controls bypass air around the throttle plate at low speeds.
-is controlled by the powertrain control module.
 
 
The engine coolant temperature sensor :
 
-sends the powertrain control module a signal indicating engine temperature.
-resistance decreases as coolant temperature increases.
 
 
The camshaft position sensor :
 
-sends the powertrain control module a signal indicating camshaft position used for fuel synchronization.
 
 
The crankshaft position sensor :
 
-sends the powertrain control module a signal indicating crankshaft position.
-is essential for calculating spark timing.
 
 
The mass air flow sensor :
 
-sends the powertrain control module a signal indicating mass airflow rate of air entering the engine.
 
 
The intake air temperature sensor :
 
-sends the powertrain control module a signal indicating the temperature of the air entering the engine.
-resistance decreases as temperature increases.
 
 
The heated oxygen sensor :
 
-has the ability to create a voltage signal dependent on exhaust oxygen content.
-provides feedback information to the powertrain control module used to calculate fuel delivery.
 
 
The 4.6L knock sensor is located in the lifter valley. The 4.2L knock sensor is located on the RH side of the block. The 5.4L has a unique linear knock sensor located in the lifter valley.
 
-sends a signal to the powertrain control module indicating engine detonation.
-if detonation is occurring, the powertrain control module then changes engine timing.
 
 
The cylinder head temperature (CHT) sensor 4.6L, 5.4L:
 
-is mounted into the wall of the cylinder head and is not connected to any coolant passages.
-sends a signal to the powertrain control module indicating the cylinder head temperature.
i-f the temperature exceeds 126°C (-258°F) 5.4L, 130°C (265°F) 4.6L, the powertrain control module disables four fuel injectors at a time. The powertrain control module will alternate which four injectors are disabled every 32 engine cycles. The four cylinders that are not being fuel injected act as air pumps to aid in cooling the engine.
-if the temperature exceeds 154 °C (310°F) 5.4L, 166°C (330°F) 4.6L, the powertrain control module disables all of the fuel injectors until the engine temperature drops below 153°C (308°F) 4.6L, 154°C (310°F) 5.4L.
DTCs are set.
-If the engine reaches critical temperature, the following happens:
The coolant temperature gauge pointer will read fully hot at 121°C (250°F).
The check gauge warning indicator will illuminate.
 
 
The vehicle speed sensor :
 
-is gear driven by the transmission.
-sends a signal to the powertrain control module indicating vehicle speed.
 
 
The clutch pedal position (CPP) switch:
 
-sends a signal to the powertrain control module indicating clutch pedal position.
 
 
The fuel pressure sensor:
 
-is mounted on the fuel injection supply manifold (9F792) downstream of the fuel injector.
-regulates the fuel pressure supplied to the fuel injectors.
 
 
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Where it says HEC that means Hybrid Electronic Cluster.
 
Odometer Display Description
 
GAGE – Activates gauge sweep of all gauges, then displays present gauge values. Also carries out the checksum tests on ROM and EE. If the gauge sweep is inoperative, INSTALL a new instrument cluster; REFER to Instrument Cluster .
 
All segments illuminated – Illuminates all odometer segments. If any odometer segment is inoperative, INSTALL a new instrument cluster; REFER to Instrument Cluster .
 
bulb – Illuminates all micro-controlled lamps and LEDs (low oil pressure/high coolant temperature, low fuel, service engine soon, brake, low range). INSTALL a new bulb or LED as necessary.
 
r – Returns to normal operation of all micro-controlled lamps and LEDs and displays hexadecimal value for ROM level (used when requesting assistance from the hotline). If alternating flashes of FAIL and ROM level are displayed, INSTALL a new instrument cluster; refer to Instrument Cluster .
 
EE – Displays hexadecimal value for EE level (used when requesting assistance from the hotline). If alternating flashes of FAIL and EE level are displayed, INSTALL a new instrument cluster; refer to Instrument Cluster .
 
dt – Displays hexadecimal coding of final manufacturing test date (used when requesting assistance from the hotline).
 
dtc – Displays continuous DTCs. Pressing the SELECT/RESET button will display any DTCs stored before proceeding to the next step.
 
enG – Displays the English speed in mph. Speedometer will indicate present speed within tolerances. Display will show 0 if input is not received, if input received is invalid for one second or more, or if speed is 0.
 
m – Displays the English speed data (mph) received from the PCM via the SCP network. Displays the metric speed in kph. Speedometer will indicate present speed within tolerances. Display will show 0 if input is not received, if input received is invalid for one second or more, or if speed is 0.
 
tAc – Displays the tachometer data received from the PCM via the SCP network. Tachometer will indicate present speed within tolerances. Display will show 0 if input is not received, if input received is invalid for one second or more, or if engine rpm is 0.
 
FUEL – Displays the actual A/D fuel level. The fuel gauge will display a filtered fuel level value. This filter will keep the pointer from moving suddenly or erratically. If the value displayed is between 0 and 20, the circuit is shorted. GO to Pinpoint Test D .
255=open send +/-0
232=Full stop +/-10
215=Full mark +/-10
178=3/4 mark +/-8
138=1/2 mark +/-7
93=1/4 mark +/-5
41=E mark +/-4
54="LOW FUEL" (0-59)
0-18=short (0-20 max.)
 
OIL – Displays the code (0-255) for the oil pressure switch input to the HEC. Displays the oil pressure reading input to the HEC. Oil pressure gauge will indicate present oil pressure. Normal oil pressure (greater than 6 psi) will display a value between 000 and 176. A low oil pressure (less than 6 psi) or an inoperative engine oil pressure switch will display a value greater than 176.
 
dEGC – Display of engine temperature in Degrees C input from cylinder head temperature sensor. If the value displayed is -40C, the SCP message for engine temperature has not been received for more than 5 seconds. GO to Pinpoint Test E .
49 C="C" mark.
60 C=Normal band start.
120 C=Normal band end.
119 C=Temperature warning indicator ON.
"-40" C=No SCP Message for 5 sec.
 
br – Displays the brake fluid level input to the HEC.
 
bAtt – Displays the code (0-255) battery voltage input to the HEC. Battery voltage gauge will indicate present battery voltage.
93-102=6.9-9.1 volts (Low voltage)
115-124=8.5-10.7 volts (Norm band start)
215-225=15.8-18 volts (Norm band end)
230-241=16.9-19.1 volts (High voltage)
 
rhEo – Displays the present hexadecimal value for the instrument cluster backlighting pulse width modulated (PWM) input to the HEC (used when requesting assistance from the hotline).
 
rhi – PWM input duty cycle.
 
rhS – SCP hexadecimal dimming step (used when requesting assistance from the hotline).
 
rho – Output driver counts in hexadecimal format (used when requesting assistance from the hotline).
 
Cr – Displays the present RUN/START sense input. Display will show -L with the ignition switch in the START position and -h with the ignition switch in the RUN position.
 
ALtF – Displays 8-bit hexadecimal value for alternate fuel level. Display will show a value between OO and FF if the message is received.
 
PA-PE7 Not used.
 
GAGE Repeats test display cycle.

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