P1860

Diagnostic Chart:

Schematic:

The Torque Converter Clutch (TCC) solenoid valve is a normally closed solenoid used to control the apply and release of the converter clutch. The TCM operates the solenoid with a duty cycle. When vehicle operating conditions are appropriate to apply the TCC, the TCM immediately increases the duty cycle to approximately 42%. The TCM then ramps the duty cycle to approximately 90% to achieve full TCC apply pressure. When the solenoid is commanded OFF, the TCM feedback is high. When the solenoid is commanded ON, the TCM feedback is low. When the TCM detects a continuous open, short to ground or short to power in the TCC PWM solenoid valve circuit, then DTC P1860 sets.

DTC PARAMETERS
^ Ignition voltage is between 8-18 volts
^ Engine has been running for more than 5 seconds, and is not in fuel cut-off
^ The TCC PWM solenoid valve duty cycle is less than 10% or greater than 90% and the following conditions have been met:
^ The TCM detects an open, short to ground or a short to power on the TCC PWM solenoid valve circuit within 5 seconds

DIAGNOSTIC AIDS
Inspect the wiring at TCM, transaxle connector, and TCC PWM Sol. Valve connector for the following conditions:
- A bent terminal
- A backed out terminal
- A damaged terminal
- Poor terminal tension
- A chafed wire
- A broken wire inside the insulation
- Moisture intrusion
- Corrosion
^ Ensure transaxle fluid is at proper level.
^ When diagnosing for an intermittent short or open condition, massage the wiring harness while watching test equipment for a change.