Step 6 Quick Test the Transmission:

STEP 6 QUICK TEST THE TRANSMISSION:




Using a high impedance test light, probe the wire harness going to pin # 2, (the center wire) for 12V. (See Figure 6)

If there's no power, you have an external electrical problem. Make sure the trans works by peeling some insulation from the wire, and using a 10 amp fused jumper wire supply 12V to the center wire, and check for 4th gear.

If you have 12V at the center wire, probe the front wire at an idle in drive. The test light should light. If not, the solenoid is bad or mis-wired. If the light comes on, accelerate on the lift to 60 MPH with the engine at operating temperature. Light should go out. If your test light doesn't go out, the computer is not grounding the solenoid. Try jumping the front wire to ground. If the unit shifts 1,2,4, the transmission works. Areas to check outside the transmission include:




If your test light goes out, your problem is inside the unit. Do the servo pressure test from Step 2. Also review Steps 4 and 5. Check for a bad solenoid. (Figure 7 shows you how).

Note
Solenoid resistance is 25-35 OHMS