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 PCM operates the solenoid with a duty cycle. When vehicle operating conditions are appropriate to apply the TCC, the PCM immediately increases the duty cycle to approximately 42%. The PCM then ramps the duty cycle to approximately 90% to achieve full TCC apply pressure. When the solenoid is commanded OFF the PCM feedback is high. When the solenoid is commanded ON, the PCM feedback is low. When the PCM detects a continuous open, short to ground or short to power in the TCC PWM solenoid valve circuit, then DTC P1860 sets.

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

DIAGNOSTIC AIDS
^ Ensure transaxle fluid is at proper level.
^ Check for intermittent connections.