Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Pinpoint Test E: A Single Speed Control Button Is Inoperative
- E1 CHECK THE SPEED CONTROL SWITCH
- Key in OFF position.
- Disconnect: Speed Control Actuator C122.
- Measure the resistance between the speed control actuator C122-5, circuit 151 (LB/BK), harness side and the speed control actuator C122-6, circuit 848 (DG/OG), harness side while pressing the speed control switch as follows:SPEED CONTROL SWITCH RESISTANCE SPECIFICATIONS
Speed Control Switch Resistance Value COAST Between 114 and 126 ohms SET/ACCEL Between 646 and 714 ohms RESUME Between 2,090 and 2,310 ohms OFF Less than 5 ohms No buttons pressed Infinite - Are the speed control switch resistance values OK?
Yes : INSTALL a new speed control actuator. REFER to SPEED CONTROL ACTUATOR in this article. TEST the system for normal operation.
No : INSTALL a new speed control switch. REFER to SPEED CONTROL SWITCH in this article. TEST the system for normal operation.
NO RELATED
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.
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.