SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSMERCURY1987LYNX L, MTXIIIREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEM1.9L EFI EEC IV TESTINGCIRCUIT TESTSTEST JJ - CONVERTER CLUTCH OVERRIDE (CCO)
1987 Mercury Lynx L, MTXIII

Test JJ - Converter Clutch Override (CCO)

1987 Mercury Lynx L, MTXIIISECTION Test JJ - Converter Clutch Override (CCO)
  1. Turn key off and wait 10 seconds. Set DVOM on 200-ohm scale. Disconnect CCO solenoid connector and measure solenoid resistance. If reading is less than 26 ohms or higher than 40 ohms, replace CCO solenoid and repeat QUICK TEST  . If reading is between 26 and 40 ohms, connect solenoid and go to next step.
  2. Turn key on, leaving engine off. With DVOM on 20-volt scale, measure voltage at CCO solenoid connector between VPWR circuit and ground. If reading is 10.5 volts or less, repair open circuit in harness and repeat QUICK TEST  . If reading is 10.5 volts or higher, go to next step.
  3. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector. Inspect connector for damaged pins, corrosion, or loose wires. Repair if necessary. Install breakout box, leaving ECA disconnected. Set DVOM on 200-ohm scale. Measure resistance between test pin No. 53 and CCO circuit at solenoid harness connector. If reading is 5 ohms or higher, repair open circuit in harness and repeat QUICK TEST  . If reading is less than 5 ohms, go to next step.
  4. Turn key off and wait 10 seconds. Leave breakout box installed and ECA disconnected. Disconnect CCO solenoid. Set DVOM on 200,000-ohm scale. Measure resistance between test pin No. 53 and test pins No. 40, 46, and 60. If any reading is less than 10,000 ohms, repair short to ground and repeat QUICK TEST  . If all readings are 10,000 ohms or higher, go to next step.
  5. Turn key off and wait 10 seconds. Leave breakout box installed, ECA and CCO solenoid disconnected. Set DVOM on 200,000-ohm scale. Measure resistance between test pin No. 53 and test pins No. 37 and 57. If all readings are 10,000 ohms or higher, replace ECA and repeat QUICK TEST  . If any reading is less than 10,000 ohms, repair short to power and repeat QUICK TEST  . If code is repeated, replace ECA.
Fig 1: CCO Circuit
G6063
RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready ToolsFree Quote CheckQuote Shield Pro

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.