NOTE: On manual transaxle models, begin with step 1). On automatic transaxle models, begin at step 3).

Turn A/C off (if equipped). Shift transaxle into Neutral and release clutch. With ignition turned off, disconnect ECA connector J1 and measure resistance between pins 1 and 12. If resistance is less than 5 ohms, proceed to step 5). If not, proceed to step 2).
Locate the gear switch (on transaxle) and the clutch switch (under dash). Disconnect wiring harness from both switches. Measure resistance across each switch. If both switches read 5 ohms or less, correct open circuit in wiring harness (Dk Grn/Wht wire and Blk/Wht wire). If not, replace defective switch, reconnect and retest.
Turn A/C off (if equipped). Shift transaxle into "N" or "P". Turn ignition on. With ECA connected, measure voltage between ECA connector J1 pin 1 and ground. If voltage is less than 0.5-volts, proceed to step 5). If voltage is more than 0.5-volts, proceed to step 4).
Locate neutral/drive switch on transaxle. Disconnect wiring harness from switch and measure resistance across switch. If resistance is less than 5 ohms, correct open circuit in wiring harness (Dk. Grn/ Wht wire). If resistance is more than 5 ohms, replace switch.
Turn ignition key on and A/C off. With ECA connected, measure voltage between ECA connector J1 pin 2 and ground. If reading is greater than 1 volt, correct short to power circuit in Blk/Yel wire. If voltage is 1 volt or less, replace processor.

Fig 1: Neutral Drive-A/C Input Circuit Diagram

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.

Safety Warning

Code 67 - Neutral Switch-A/C Input