yo Tom,
WELCOME!
We'll begin w/Grounds as Ron advised;
1995 Ford Bronco 5.8
by
http://www.revbase.com/BBBMotor/Wd This site also has TSBs
Ground pdf
http://www.revbase.com/BBBMotor/Wd/DownloadPdf?id=9877
Page 2 shows G104 for PCM (Powertrain Control Module (aka EEC, Computer for engine & transmission controls)
Page 3 shows Transmission Range (TR) Sensor (AKA Manual Lever Position (MLPS) ) to Splice S102 that is in Engine control sensor harness, near T/O to brake warning resistor/diode assembly. See
Wiring Diagram in a 95 Bronco; from Ford EVTM by Ryan M below in 2nd diagram (no grounds shown)
& FYI E4OD Wiring Diagrams in a 95 by Ryan M; Bronco similar (no grounds shown)
http://web.archive.org/web/20101201004715/http://fordfuelinjection.com/files/bronco_1995_30-1.gif
http://web.archive.org/web/20101201004841/http://fordfuelinjection.com/files/bronco_1995_30-2.gif
Locations & Components in a 96 (95 similar);
G101 front of engine compartment, front of fender apron (D1) - RH = Passenger side mine has 2 small black wires between starter relay & headlight; this is #5 in the diagram;
G100 & G104 (tied together in diagram); G100 @ LH front of engine compartment on upper radiator support;
G104 @ Rear of LH fender apron near hood hinge and 4WABS Test Connector (RED);
G100 Serves Component, LH Oxygen Sensor, Fuel Pump Module, Inertia Fuel Shutoff, Misfire Sensor, Misfire Sensor Shield, Output Shaft Speed (OSS) Sensor, Powertrain Control Module (PCM) 5.0L;
G101 Serves, RH Oxygen Sensor
G104 Serves Component: 4WABS Control Module, 4WABS Data Link Connector, 4WABS Relay #1, Instrument Cluster
, Powertrain Control Module (PCM) 5.8L, Programmable Speedometer/Odometer Module (PSOM), Trailer Relay Box;
G103 (battery to engine) Lower RH front of engine serves Component, 4WABS Pump Motor, Battery, Data Link Connector (DLC), Mass Air Flow (MAF) Sensor, Powertrain Control Module (PCM) 5.0L,
Powertrain Control Module (PCM) 5.8L, Right Front Park/Turn Lamp, Right Front Side Marker Lamp Right Headlamp;
G201 Behind bottom of LH cowl panel (driver's side kick panel) Component, Compass/Outside Temperature Module, Day/Night Mirror, Inside Cargo Lamp, Left Power Lumbar Compressor Motor, Outside Cargo/High Mount Stop Lamps, Right Power Lumbar Compressor Motor, Seat Belt Switch, Door Lock Actuator (PDL & Probably Power Window Motor);
G200 Behind bottom of RH cowl panel serves Component, Air Bag Diagnostic Monitor, Electronic Shift Control Module (Transfer Case), Instrument Cluster,
Programmable Speedometer/Odometer Module (PSOM), Remote/Keyless Entry Module, Speed Control Servo/Amplifier Assembly;
G103 (battery to engine) Lower RH front of engine serves Component, 4WABS Pump Motor, Battery, Data Link Connector (DLC), Mass Air Flow (MAF) Sensor, Powertrain Control Module (PCM) 5.0L, Powertrain Control Module (PCM) 5.8L, Right Front Park/Turn Lamp, Right Front Side Marker Lamp, Right Headlamp;
G400 Rear Window Defroster @ LH rear corner of cargo area, near rear lamp assembly; Engine Block pic in a 94 5.8; "...The black battery wire goes from the front bolt of the engine mount (on the block) to this tab & up to the battery post, where a smaller black wire goes to the core support, providing a continuous ground path between the engine, frame, battery, & body; Frame & Battery pic in a 93; "...With the wheelwell gone, it's easy to inspect the frame ground, just inboard of the spring tower on top of the frame rail. The battery ground cable is stripped ~3/4" and a tab is soldered on so it can be bolted to the frame; Intake Manifold to Block Strap Location in a 96 5.0 is between 2nd & 3rd plugs on passenger side.
SEE PICS & Diagrams
Source: by miesk5 at Ford Bronco Zone Forums http://broncozone.com/topic/20952-loose-
Check Engine Light (CEL) come on when the electronic engine control system is not working properly. The check engine warning indicator comes on briefly when the ignition switch lock cylinder is turned to ON, and should turn off when the engine starts. If the CEL does not come on when the ignition switch lock cylinder is turned to ON
or if it comes on while the vehicle is moving, the system is malfunctioning. Is CEL on while driving?
If the CEL does not light up at all when starting it; then suspect that bulb is burnt-out or loose, socket was damaged by PO or shop, etc. or someone removed it, which does happen, unfortunately.
Same for Amber ABS lamp in Instr Panel.. The 4-wheel anti-lock brake system in 93-96 is self monitoring. When the ignition switch is placed in the RUN position, the anti-lock brake electronic control module will perform a preliminary self check on the anti-lock electrical system indicated by a momentary illumination of the amber ABS warning light in the instrument cluster. During vehicle operation, including normal and anti-lock braking, the anti-lock brake electronic control module monitors all electrical anti-lock functions and some hydraulic operations.
Is ABS light on while driving?
Is the speedometer (electronic Programmable Speedometer/Odometer) working ok? No jumping around like a flea in-heat or off MPH?
Is the Transmission Control Switch (TCS) and Lamp at end of shifter blinking while driving?
Cruise Control (if equipped) is inop? (BTW, there is a Recall for the CC deactivation switch mtd on Master Cylinder; can cause a FIRE! even if engine is off; call local dealer, have VIN ready)
Try a Self Test for Diagnostic Trouble Codes (DTC)s by my pal, BroncoJoe19
http://broncozone.com/topic/14269-code-reader/?&pid=74587&mode=threaded
Some basics;
Take your time, have a helper ready to assist; my much better-half oversees all my work...
The engine temperature must be greater than 50° F for the Key On Engine Off (KOEO) Self-Test and greater than 180° F for the Key On Engine Running (KOER) Self-Test.
Run it around to heat the engine up and shift thru all gears including Reverse.
Make sure A/C is off and transmission is in Park (automatic).
Then turn off engine, all accessories/lights (close driver's door) , etc.
Do KOEO test First
Post Code(s) here according to:
KOEO
&
KOER
The shop could pull the PCM and inspect for;
Capacitor Repair in a 90 5.8
Source: by seedpress (dolittle) at Ford Bronco Zone Forums
http://broncozone.com/topic/20788-fuel-delivery-problem/
Next is FYI to help communications with the shop;
Section 07-01A: Transmission, Automatic, E4OD
DESCRIPTION AND OPERATION
Transmission Electronic Control System
Electronic System Description
The following pages provide a brief description of each of the sensors and actuators used with the E4OD transmission. The function of each of these components and the associated symptoms and diagnostic trouble codes (DTCs) are also given.
http://www.diesel-dave.com/vehic/manual/stj/stj71a10.htm#extract_995
It is for a 96, but same for your 95 except for any OBD II (EEC-V
) info and that isn't an issue now.
SIGNIFICANT EXCERPTS:
On vehicles equipped with gasoline engines, the operation of the E4OD automatic transmission is controlled by the powertrain control module (PCM, EEC, Computer). Many input sensors provide information to the powertrain control module, which then controls the actuators that affect transmission operation.
Programmable Speedometer/Odometer Module (PSOM):
Description: The programmable speedometer/odometer module receives input from the rear brake anti-lock sensor, which is mounted on the rear axle differential housing. The PSOM processes this input signal information and relays it to the powertrain control module and the speed control module. This signal tells the powertrain control module the vehicle speed in miles per hour (mph). Used as an input in determining shift scheduling and electronic pressure control.
Symptoms: Harsh engagements, firm shift feel, abnormal shift schedule, unexpected downshifts may occur at closed throttle, abnormal torque converter clutch operation or engages only at wide-open throttle (WOT). May flash transmission control indicator lamp.
Diagnostic Trouble Codes: 452
Transmission Control Switch (TCS) and Transmission Control Indicator Lamp (TCIL):
Description: The transmission control switch (TCS) is a momentary contact switch. When the switch is pressed, a signal is sent to the powertrain control module. The powertrain control module then energizes the transmission control indicator lamp and the coast clutch solenoid, applying the coast clutch to provide engine braking and cancels fourth gear operation. The TCIL indicates overdrive cancel mode activated (lamp on), electronic pressure control circuit shorted or monitored sensor failure (lamp flashing).
Sensor: Transmission Control Switch.
Symptoms: No overdrive cancel when switch is cycled.
Diagnostic Trouble Codes: 632, P1780, tested during Key On Engine Off (KOEO) On-Board Diagnostic only.
Actuator: Transmission Control Indicator Lamp.
Symptoms: Failed on — overdrive cancel mode always indicated, no flashing for electronic pressure control circuit shorted. Failed off — overdrive cancel mode never indicated, no flashing for electronic pressure control circuit shorted, also may be due to a bad fuse. Erratic operation (flashing) may be due to a wiring concern.
Diagnostic Trouble Codes: 631,
Throttle Position (TP) Sensor 9B989:
Description: The throttle position sensor is a potentiometer that is mounted on the throttle body on gas applications and on the fuel injection pump lever on diesel applications. The throttle position sensor detects the position of the throttle plate or lever and sends this information as a voltage signal to the powertrain control module. If a malfunction occurs in the throttle position sensor circuit, the powertrain control module will recognize that the throttle position sensor signal is out of specification. The powertrain control module will then operate the E4OD transmission at a higher line pressure to prevent transmission damage. This high line pressure causes harsh upshift and engagements. Used as an input to determine shift scheduling and electronic pressure control.
Symptoms: Harsh engagements, firm shift feel, abnormal shift schedule, abnormal or no torque converter clutch operation. May flash transmission control indicator lamp.
Diagnostic Trouble Codes: 121, 122, 123, 124, 125, 167
Vehicle Speed Sensor (VSS) 9E731:
Description: The vehicle speed sensor is a variable reluctance sensor that sends an AC/frequency signal to the powertrain control module. The vehicle speed sensor signal is used by the powertrain control module to calculate vehicle speed in mph. Used as an input in determining shift scheduling and electronic pressure control.
Symptoms: Harsh engagements, firm shift feel, abnormal shift schedule; unexpected downshifts may occur at closed throttle, abnormal torque converter clutch operation or torque converter clutch engages only at wide-open throttle. May flash transmission control indicator lamp.
Diagnostic Trouble Codes: 452
Transmission Range (TR) Sensor 7A247:
Description: The powertrain control module sends voltage to the Transmission Range (TR) sensor. The TR sensor incorporates a series of step-down resistors which act as a voltage divider. The powertrain control module monitors this voltage which corresponds to the position of the gearshift selector lever (P, R, N, (D), 2 or 1). The powertrain control module uses this information to determine the desired gear and electronic pressure control pressure. The TR sensor is located on the outside of the transmission at the gearshift selector lever.
Symptoms: Harsh engagements, firm shift feel.
Diagnostic Trouble Codes: 634, 654, 667, 668