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FORD BRONCO
-> ELECTRICAL; EEC/PCM, Self-Test, wiring diagrams...
-> Short Circuits
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WELCOME to MIESK5's BIG BRONCO LINKS - We now have over 23,000 LINKs!
This is a Ford Bronco, Truck & Van Technical & Parts LINKS site developed by the MIESK5 Family & is not affiliated with the Ford Motor Company in any manner.
Although we initially developed this site for 78-96 Big Broncos, information in many Links also applies to Ford Trucks, Vans & Cars.
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DTC 172, 173 or 41 for HO2S Failure Or Fuse "E" Inoperative, ABS Light On, Back-Up Lamps Inoperative, DRLs Inoperative, MIL On, Inadvertent Self-Test, Speedometer Inoperative & Trailer Battery Charge Relay Inoperative in TSB 95-5-21 for 92-95 Bronco & F Series; "On some vehicles the HO2S wires in the 12A690 (subassembly of the 14B060 battery cable) harness may become chafed and the vehicle could exhibit any one of the following conditions..." READ MORE
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Fuse 17 Blown, Short Circuit The transmission control switch wiring may be misrouted causing a short in the steering column and a blown # 17 fuse. The following symptoms may be associated with this concern; Early shifts, Loss of power, Poor acceleration, 3-4 shift cycling, Transmission control light cycling ON/OFF or inoperative, Transmission control switch inoperative, Rear Anti-Lock Brake System (RABS) electronics (dash lights on, etc.) inoperative, Loss of instrumentation (tach, fuel gauge, etc.), Unable to read Self-Test codes (solid tone only)
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Hesitation, Stumble, Stall, Miss, No Start, No Spark and/or Diagnostic Trouble Code (DTC) 211 TSB 95-15-11 for 93-95 (Shorts in Profile Ignition Pickup (PIP) & Spark Output (SPOUT)
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PSOM & Keyless Entry Inoperative; Fuse 8 Overload, Possible Short In Circuit 54 TSB 95-14-11 for 94-95 Bronco & F Series
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PSOM & Odometer Not Working & E4OD Harsh Shift TSB 94-09-12 for 94 Bronco & F Series; "...PSOM (Programmable Speedometer/Odometer Module) may be inoperative or not function properly and the #8 fuse may be blown. In addition, if the vehicle is equipped with an E4OD transmission, it may exhibit a harsh shift. These conditions may be caused by trim screws installed through the 17K745 visor wire between the left hand "A" pillar and the left hand visor bullet connector..."
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Short Circuits, Common Locations TSB 95-02-11 in 94-95 Bronco & Trucks
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Air Bag Wiring Diagram for a 93 Taurus but Similar; includes possible short locations where the HEAVY DARK LINES are in the wiring diagram; read more
Source: by Ford via tbird100636 at fordforums.com
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Battery Drain; "...Disconnect the positive clamp on your battery but take care not to touch the body metal with the wrench when doing this. Now connect an small light between the + terminal and the clamp. Put the clamp on a rag so it can't touch the sheet metal. If any drain is present the light will glow. Or you can check the amount of drain with an small ammeter. An drain of 1-2 Watts can be tolerated. Next pull the fuse for the mechanic clock and the radio. Still any current flowing (light on)? Ok, so you really have a problem. Now start pulling the fuses in the fuse box one by one until the light goes off. This is the circuit in which the problem lies. Check your manual or the indications in the cover of the fuse box to see which systems are connected to that fuse. The next steps depend on the systems concerned. Try disconnecting each one of the parts connected in the circuit. Again it's the same - when the light goes out you've found the problem. Even better than a light bulb is an buzzer. Many people have one of those annoying little rascals lying around. Use it..."
Source: by Alain H at landroverclub.net
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Cigar Lighter & OBD II Diagnostic Link Connector (DLC); "...found that my cig lighter's 12v vehicle power (VPWR) Lt Blue/White wire chaffed & shorted on ashtray frame. It caused Fuse 16 to blow itself..out (& in 96, this also caused the OBD II Diagnostic Link Connector (DLC) not to "power up" @ pin 16)..."
Source: by miesk5 at FSB
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Code Reader Will NOT Power up; 96 Bronco & all Ford; "Check fuse 16 (Bronco) for the cigarette lighter. It is shared with the OBDII connector power and is commonly blown" miesk5 note; our 96's lighter wiring shorted out @ ashtray support..."
Source: by miesk5 at FSB
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Dome Light Connector Corrosion in Driver's Side B Pillar pic; "...This is a picture of the connector behind the driver side seat belt retractor. This is a common area of problems. On mine, the wires had corroded and fell out of the connector. green wire had corroded on the connector and preventing power getting to the dome light..."
Source: by Jem270 at SuperMotors.net
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DTC 211; Hesitation, Stumble, Stall, Miss, No Start, No Spark and/or Diagnostic Trouble Code (DTC) 211 TSB 95-15-11 for 93-95; Shorts in Profile Ignition Pickup (PIP) & Spark Output (SPOUT)
Source: by Ford via Steve83 (Steve, That dirty old truck) at SuperMotors.net
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DTC 212; "...IDM is a feedback signal generated by the ignition system and is monitored at pin #4 of the ECM. Its purpose is to diagnose missed ignition primary pulses at the time the ECM commands the Spout signal to fire the coil. Since it is used solely for diagnostic purposes, if this circuit is not operating properly, it will not affect vehicle driveability; & by Seattle FSB- The Ignition Diagnostic Monitor (IDM) signal is a diagnostic signal for the PCM to to verify a coil firing for each PIP signal. If an erratic or missing IDM signal is received, a Diagnostic Trouble Code (DTC 212) is set. An occasional IDM signal may not affect drivability, but can still throw a trouble code. As SigEpBlue has stated, check for an intermittent ground on the spOUT and/or IDM circuit. Also, ensure that you have the correct Ignition Control Module (ICM) and it is wired correctly to the PCM..."
Source: by SMP via SigEpBlue (Steve) & by Seattle FSB (SeattleFSB) at FSB
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DTC 51 Air Bag Diagnostic Monitor Internal Thermal Fuse,Fuse Blown Due to Intermittent Short to ground; "...In the diagram see the Note: "This shorting bar in the gray diagnostic monitor harness connector, Remove the plastic wedge in the gray connector before checking circuit 824 or 817 for a short to ground." Now, I believe the ckts should be 624 or 617. for da Clock Spring/etc. ckt & Front Sensor ckts..." read more
Source: by Ford via miesk5 at Ford Bronco Zone Forums
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DTC 536 - Brake On/Off circuit failure / switch not actuated during KOER test or shorted to ground
Source: by miesk5 at FSB
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DTC 536 - Brake On/Off circuit failure / switch not actuated during KOER test or shorted to ground
Source: by miesk5 at Ford Bronco Zone
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DTC P0552 - Power Steering Pressure (PSP) Sensor Circuit Malfunction; "... The PSP sensor input signal to the PCM is continuously monitored.The test fails when the signal is open or shorted to ground. PSP sensor damaged SIG RTN circuit open or shorted VREF circuit open or shorted PSP sensor signal circuit open or shorted Damaged PCM The DTC indicates the PSP sensor circuit is open or shorted to ground..."
Source: by slingblade at The National Lightning Owners Club
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DTC P0553 - Power Steering Pressure (PSP) Sensor Circuit Malfunction; "... The PSP sensor input signal to PCM is continuously monitored. The test fails when the signal is shorted to power. PSP sensor damagedSIG RTN circuit shorted to power VREF circuit shorted to power PSP sensor signal circuit shorted to power Damaged PCM The code indicates the PSP sensor circuit is shorted to power..."
Source: by slingblade at The National Lightning Owners Club
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DTC P1000; "...P1000 - Monitor Testing Not Complete The on board diagnostic II (OBD II) monitors are performed during the OBD II Drive Cycle. The DTC will be stored in continuous memory if any of the OBD II monitors do not complete. Vehicle is new from the factory Battery or PCM had recently been disconnected An OBD II monitor failure had occurred before completion of an OBD II drive cycle PCM DTCs have recently been cleared with a scan tool PTO circuit is shorted to VPWR or B+ or PTO is on during testing The DTC does not need to be cleared from the PCM except to pass an inspection/maintenance test..."
Source: by slingblade at The National Lightning Owners Club
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E4OD Transmission Control Indicator Lamp (TCIL) Flashing because wiring may be misrouted causing a short in the steering column and a blown # 17 fuse TSB 92-22-5 for 92 Bronco & all Light Trucks
Source: by miesk5 at FSB
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E4OD Transmission Control Indicator Lamp (TCIL) Flashing because wiring may be misrouted causing a short in the steering column and a blown #17 fuse in TSB 92-22-5 for 92 Bronco & all Light Trucks
Source: by coaltruck344 at answers.yahoo.com
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E4OD Transmission Control Indicator Light (TCIL) Troubleshooting in 92-96; "... need to look for my notes on what fuse blew. think it was 6 or 7 due to a harness short under steering column that affected the OD Cancel Light (it blinked randomly, no Trouble Codes or tranny malfunctions though)..."
Source: by miesk5 at FSB
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E4OD Transmission Control Indicator Light (TCIL) Troubleshooting in 92-96; "...check the wires coming out of the shifter handle, I have had several trucks have those wires short out and cause some strange symptoms. Just pull the plastic cover off the top of the column and take a look, it's pretty obvious when it happens..."
Source: by jrainw at fte
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E4OD Transmission Control Indicator Light (TCIL) Troubleshooting in 92-96; "...This symptom could be caused by a couple of problems. One is the transmission is malfunctioning. The bulb in the switch at the end of the shifter is flaky. The wire that connects the OD switch/light at the end of the shifter is being worn at the column. Process of elimination. Codes to the computer and the light flashing in a "repetetive pattern" and consistent manner indicate a trani malfunction. A flashing OD light that is sporatic, has no pattern, is accompanied by a also sporatic OD engagement indicated that the wires are being worn and possibly shorted at the column. This is a common problem with these. The light flashing in a sporatic and sometimes on and sometimes off for longer periods indicated a bad switch at the end of the column. (my case) Hope it is one of the easier ones. (Switch light or wires at column)..."
Source: by Mr P at rv.net via web.archive
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Fuse "E" Inoperative could exhibit any one of the following conditions: ABS Light On, Back-Up Lamps Inoperative, DRLs Inoperative, MIL On, Speedometer Inoperative, DTC 172, 173 or 41 for HO2S Failure in TSB 95-5-21 for 92-95 Bronco & F Series; On some vehicles the HO2S wires in the 12A690 (subassembly of the 14B060 battery cable) harness may become chafed READ MORE
Source: by Ford via Chilton
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Fuse 17 Blown, Short Circuit The transmission control switch wiring may be misrouted causing a short in the steering column and a blown # 17 fuse. The following symptoms may be associated with this concern; Early shifts, Loss of power, Poor acceleration, 3-4 shift cycling, Transmission control light cycling ON/OFF or inoperative, Transmission control switch inoperative, Rear Anti-Lock Brake System (RABS) electronics (dash lights on, etc.) inoperative, Loss of instrumentation (tach, fuel gauge, etc.), Unable to read Self-Test codes (solid tone only) in TSB 92-22-5
Source: by miesk5 at FSB
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Fuse 17 Blown, Short Circuit The transmission control switch wiring may be misrouted causing a short in the steering column and a blown # 17 fuse. The following symptoms may be associated with this concern; Early shifts, Loss of power, Poor acceleration, 3-4 shift cycling, Transmission control light cycling ON/OFF or inoperative, Transmission control switch inoperative, Rear Anti-Lock Brake System (RABS) electronics (dash lights on, etc.) inoperative, Loss of instrumentation (tach, fuel gauge, etc.), Unable to read Self-Test codes (solid tone only) in TSB 92-22-5
Source: by coaltruck344 at answers.yahoo.com
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Fusible Link A, J & S Location Diagram, Engine Area in a 92 5.0 & 5.8
Source: by Ford via Jem270 at Supermotors.net
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Hesitation, Stumble, Stall, Miss, No Start, No Spark and/or Diagnostic Trouble Code (DTC) 211 TSB 95-15-11 in 93-95 (Shorts in Profile Ignition Pickup (PIP) & Spark Output (SPOUT)
Source: by Ford via justanswer.com
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Loss of Instrumentation (tach, fuel gauge, etc.); E4OD transmission control switch wiring may be misrouted causing a short in the steering column and a blown # 17 fuse for 92-96 in TSB 92-22-5 for 92 Bronco & all Light Trucks
Source: by miesk5 at FSB
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Odometer & Keyless Entry Inoperative; Fuse 8 Overload, Possible Short In Circuit 54 TSB 95-14-11 for 94-95 Bronco & F Series; also affected Inoperative Courtesy, Map, Engine & Glove Compartment, Dome, Vanity, & Cargo Lamps & Inoperative Power Mirrors
Source: by Ford via thedieselstop.com
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Parasitic Current Drain Test; "...you should be able to trace the "parasitic draw" on the battery in the normal way. Pull the (-) cable off & put an ammeter inline set to the 10A range (or higher if possible) to see how much current is being pulled out of the battery with the key OFF, the doors SHUT, & the hood light bulb REMOVED. Make sure absolutely NOTHING is turned on anywhere on the truck. If it registers 0 or below the meter's next range, switch it down a range until it shows some useful numbers. If it ends up being below 0.5A (500mA), then replace the battery. If it's above that, start by disconnecting all the alternator wires & see if the reading drops under 0.5A. Then move to the fuse block & pull them 1 at a time until there's a significant drop in the reading. That's the circuit that's draining the battery. Follow it to find the problem..."
Source: by Steve83 (Steve, That dirty old truck) at FSB
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Parasitic Current Drain Testing Methods
Source: by bbbind.com
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Parasitic Current Drain Testing Methods
Source: by Larry H at mightyautoparts.com
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PSOM & Odometer Not Working & E4OD Harsh Shift TSB 94-09-12 for 94 Bronco & F Series; "...PSOM (Programmable Speedometer/Odometer Module) may be inoperative or not function properly and the #8 fuse may be blown. In addition, if the vehicle is equipped with an E4OD transmission, it may exhibit a harsh shift. These conditions may be caused by trim screws installed through the 17K745 visor wire between the left hand "A" pillar and the left hand visor bullet connector..."
Source: by Ford via Ron at justanswer.com
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RABS Inoperative (dash lights on, etc.); E4OD transmission control switch (TCIL) wiring may be misrouted causing a short in the steering column and a blown # 17 fuse for 92-96 in TSB 92-22-5 for 92 Bronco & all Light Trucks
Source: by miesk5 at FSB
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Scan Tool Won’t Initiate Self-Tests (solid tone only); E4OD transmission control switch wiring may be misrouted causing a short in the steering column and a blown # 17 fuse for 92-96 in TSB 92-22-5 for 92 Bronco & all Light Trucks
Source: by miesk5 at FSB
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Scan Tool Won’t Initiate Self-Tests, STO/MIL circuit shorting intermittently to ground; "...Occasionally, there are reports of the Malfunction Indicator Lamp (MIL) "Check Engine" or "Service Engine Soon" lamp being lit with no Self-Test codes in Continuous Memory; in MIL Explanation with No Self Test Codes TSB 92-24-3 by Ford for 91-93; The EEC processor will erase a Continuous Memory code if the concern that caused it has not been present for 40 or 80 warm-up cycles, depending on the vehicle. A warm-up cycle occurs when the vehicle is started with the coolant temperature below 120° F (49° C) and then shutdown with the coolant temperature above 150° F (66° C). If a vehicle is brought in for service with a MIL complaint and the vehicle is driven or otherwise allowed to warm-up before Self-Test is run, the code may be cleared before the technician tests it. 4) Grounded STO/MIL Circuit The processor controls the MIL by grounding the STO/MIL circuit (Pin 17). If this circuit shorts to ground, whether the processor is controlling it or not, the MIL will be lit. Starting in 1991, if the processor has lit the MIL, it will hold it on for a minimum of 10 seconds. If the MIL flashes quickly, the concern is probably the STO/MIL circuit shorting intermittently to ground..."; "...The self-test plugs were mounted on the passenger side fender on 1985-86 EFI trucks; The self-test plugs are located along the driver's side fender behind the air filter box on 87-95 EFI trucks..."; miesk5 NOTE; Self-Test Input (STI) is the Pin in the Lt gray Connector and Signal Return Ground (STO/SIGRET) is Pin E in black Connector in 87-95; The engine temperature must be greater than 50°F (10°C) to pass the KOEO Self-Test and greater than 180°F (82°C) to pass the KOER Self-Test. Run it around to heat the engine up and shift thru all gears incl Reverse. Then turn off all accesories/lights, etc. Make sure A/C is off and transmission is in Park (automatic) or in Neutral for a Manual & release clutch. Do Key On Engine Off (KOEO) portion first. Look Codes up in my broncolinks.com site using the new Search function.
Source: by Ford via miesk5 at cc
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Short Circuits, Common Locations TSB 95-02-11 on 94-95 Bronco & Trucks; See O. Fuse 13 Blown
Source: by Ford via Steve83 (Steve, That dirty old truck) at SuperMotors.net
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STO/MIL circuit shorting intermittently to ground; "...Occasionally, there are reports of the Malfunction Indicator Lamp (MIL) "Check Engine" or "Service Engine Soon" lamp being lit with no Self-Test codes in Continuous Memory in MIL Explanation with No Self Test Codes TSB 92-24-3 by Ford for 91-93...The EEC processor will erase a Continuous Memory code if the concern that caused it has not been present for 40 or 80 warm-up cycles, depending on the vehicle. A warm-up cycle occurs when the vehicle is started with the coolant temperature below 120° F (49° C) and then shutdown with the coolant temperature above 150° F (66° C). If a vehicle is brought in for service with a MIL complaint and the vehicle is driven or otherwise allowed to warm-up before Self-Test is run, the code may be cleared before the technician tests it. 4) Grounded STO/MIL Circuit The processor controls the MIL by grounding the STO/MIL circuit (Pin 17). If this circuit shorts to ground, whether the processor is controlling it or not, the MIL will be lit. Starting in 1991, if the processor has lit the MIL, it will hold it on for a minimum of 10 seconds. If the MIL flashes quickly, the concern is probably the STO/MIL circuit shorting intermittently to ground..."; "...The self-test plugs were mounted on the passenger side fender on 1985-86 EFI trucks; The self-test plugs are located along the driver's side fender behind the air filter box on 87-95 EFI trucks..."; miesk5 NOTE; Self-Test Input (STI) is the Pin in the Lt gray Connector and Signal Return Ground (STO/SIGRET) is Pin E in black Connector in 87-95; The engine temperature must be greater than 50°F (10°C) to pass the KOEO Self-Test and greater than 180°F (82°C) to pass the KOER Self-Test. Run it around to heat the engine up and shift thru all gears incl Reverse. Then turn off all accesories/lights, etc. Make sure A/C is off and transmission is in Park (automatic) or in Neutral for a Manual & release clutch. Do Key On Engine Off (KOEO) portion first. Look Codes up in my broncolinks.com site using the new Search function.
Source: by Ford via miesk5 at cc
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Troubleshooting with a Self-Powered Test Light or Multi-Meter (ohmmeter) General; Opens, Short, Voltage & Voltage Drop, Continuity & Diodes
Source: by freeautomechanic.com
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Troubleshooting with a Test Light (low resistance) General; "...low resistance test light can sometimes be used in place of a blown fuse. The light will illuminate while a short circuit to ground exists. DO NOT use a medium or high resistance test light in place of a blown fuse. These types of test lights illuminate with very small amounts of current and can be misleading..." read more
Source: by ocw.weber.edu
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Troubleshooting with a Test Light (low resistance) General; "...The other way I use a test light is to check for short circuits. This test is done by putting the test light in place of the fuse. I use the small Radio Shack jumpers to do this. If you turn off all of the lights or loads on the circuit being tested, the light will go out when you have found the short, but it will light brightly while the short is still there...." READ MORE
Source: by Chris B at blog.rv.net
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Turn Signal, Front Harness Chaffing & Repair Video in a 94
Source: by pfun41 at youtube.com
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Wiring Harness Repairs in a 79
Source: by Kevin M (Project Double Agent) at okcnetworks.com
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Wiring Harnesses & Component Location Diagram, Ford Part Numbers, Depictions, etc. from Ford Workshop Manual in 96 Bronco, F-150, F-250, F-350, F-Super Duty Chassis Cab & Motorhome Chassis; use your Browser's SEARCH (or FIND) function to locate what you seek in each Diagram, such as Air Bag or E4OD, etc.
Source: by Ford via thedieselstop.com
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