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HOMESERVICE MANUALSFORD1985BRONCO 5.8 G, STANDARD, TODREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 39 (4.9L FEEDBACK CARBURETOR EEC IV TESTING)QUICK TESTSCONTINUOUS MONITOR (WIGGLE) TEST
1985 Ford Bronco 5.8 G, Standard, TOD

Continuous Monitor (Wiggle) Test

1985 Ford Bronco 5.8 G, Standard, TODSECTION Continuous Monitor (Wiggle) Test
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 1986 Ford RV Cutaway, 1986 Ford Pickup, 1986 Ford Econoline, 1986 Ford Cutaway, and 1986 Ford Club Wagon. However, it is still accessible from the selected car via links, so may be relevant.

The Self-Test Output (STO) will be activated each time a fault is detected. If the STO is activated long enough during the wiggle tests a service code will be stored. A fault is indicated by a 10.5 volt or greater deflection on VOM. STAR tester LED turns off.

  • KEY ON/ENGINE OFF  Test: With SELF-TEST deactivated, turn ignition on to enter into wiggle mode.
  • KEY ON/ENGINE RUNNING  Test: Activate SELF-TEST and perform ENGINE RUNNING SELF-TEST. After service code output has finished, do not turn engine off or deactivate SELF-TEST. About 2 minutes after code 11 has been displayed, wiggle mode will start. The system will remain in wiggle mode until SELF -TEST is deactivated or engine is turned off.

NOTE: An alternate method of entering CONTINUOUS MONITOR (WIGGLE)  TEST with engine running is to start ENGINE RUNNING SELF-TEST, exit, and re-enter KEY ON/ENGINE RUNNING SELF-TEST  without turning engine off.
  1. Observe VOM while moving, wiggling, and tapping the system harness (in short sections), connectors, and sensors. If an intermittent condition is created, the monitor will indicate this by storing a service code. Carefully inspect harness and associated connectors of affected circuits.
  2. If an intermittent condition is not created, carefully disconnect sensor from harness. Remove terminals from connector and visually inspect terminals at both ends for corrosion, bad crimps, improperly seated terminals, etc.
  3. Reconnect harness after inspection. Disconnect ECA from harness as carefully as possible. Remove and inspect terminals associated with sensor being checked.
  4. If an intermittent condition cannot be created, reconnect connector and erase the CONTINUOUS SELF-TEST  service codes. To erase service codes, activate KEY ON/ENGINE OFF SELF-TEST  .
  5. Remove jumper from Self-Test Input (STI) terminal as soon as first service code appears. Repeat SELF-TEST with jumper to verify that service codes have been erased. QUICK TEST  is complete.
CONTINUOUS SELF-TEST CIRCUIT TEST MENU

Code No. Go To Test No. (Step No.)
14 JJ (1)
18 FF (1)
21 F (9)
22 G (14)
41 Q (1)
42 Q (9)
51 F (10)
53 I (11)
61 F (10)
63 I (15)
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.