For 1990-2009 cars

#### No Converter Clutch Apply

Checks | Cause
--- | ---
Verify Proper PCM Operation and Vehicle Wiring | Improper operation or wiring
Wiring Harness |

• | Damaged or loose connector

• | Pinched wires

• | Inoperative TCC Solenoid valve

Control Valve Assembly |

• | Stuck converter clutch valve

• | Stuck converter clutch regulator valve

TCC Solenoid Valve | Leaking solenoid O-ring
Solenoid Screen | Blocked screen
Torque Converter | Inspect the converter (refer to the section on Transmission Unit Repair)
Turbine Shaft | Damaged seals
Oil Pump Drive Shaft | Damaged seal
Channel Plate | Damaged or unseated blow off checkball for the converter clutch
TCC Solenoid Valve for OFF Failure |

• | Foreign material and plugging in the filter

• | Insufficient force

• | O-ring failure

• | No PCM signal

• | Open wire

• | No supply voltage to the TCC solenoid valve

• | Improperly molded solenoid housing, which causes the solenoid to separate from the control valve assembly

TCC Solenoid Valve for ON Failure |

• | Foreign material

• | Pinched wire

• | Grounded PCM signal

Brake Switch (No TCC Apply) |

• | No supply voltage

• | Corroded connector

• | Corroded switch contact

• | Loose connector

• | Pinched wire

PRNDL Circuit Problem |

• | Loose connector

• | Corroded connector

• | Corroded switch contact

• | Pinched wire

• | PRNDL connector wires A and B are switched around, if PRNDL indicates anything but D3 or D4

Coolant Temperature Sensor |

• | Corroded Connector

• | Incorrect resistance

• | Loose connector

• | Pinched wire