Mystique L4-122 2.0L DOHC VIN 3 SFI (1995)
Code 991 - 999: Testing and Inspection
NOTE
KOEO refers to Key On Engine Off (KOEO)
KOER refers to Key On Engine Running (KOER)
DTC refers to Diagnostic Trouble Code (DTC)
DTCs should be diagnosed in the order they are received.
DTC 641
Shift Solenoid 3 circuit failure.
KOEO Hard Code ..................................................................................................................................................................................... Go to TC1
See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Pinpoint Tests/TC - Transmission Solenoids/TC1 - Enter
Output State Diagnostic Test Mode
DTC 643
Torque Converter Clutch circuit failure.
KOEO Hard Code ................................................................................................................................................................................... Go to TC20
See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Pinpoint Tests/TC - Transmission Solenoids/TC20 - Check
Solenoid Resistance
KOEO Memory Code ............................................................................................................................................................................. Go to TC30
See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Pinpoint Tests/TC - Transmission Solenoids/TC30 -
Visually Check Shift Solenoid Harness
DTC 645
Incorrect gear ratio obtained for first gear.
KOEO Memory Code ............................................................................................................................................................................. Go to TG90
See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Pinpoint Tests/TG - Electronic Transmission - Continuous
Memory Service Codes/TG90 - Perform Drive Cycle Test
DTC 646
Incorrect gear ratio obtained for second gear.
KOEO Memory Code ............................................................................................................................................................................. Go to TG90
See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Pinpoint Tests/TG - Electronic Transmission - Continuous
Memory Service Codes/TG90 - Perform Drive Cycle Test
DTC 647
Incorrect gear ratio obtained for third gear.
KOEO Memory Code ............................................................................................................................................................................. Go to TG90
See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Pinpoint Tests/TG - Electronic Transmission - Continuous
Memory Service Codes/TG90 - Perform Drive Cycle Test
DTC 648
Incorrect gear ratio obtained for fourth gear.
KOEO Memory Code ............................................................................................................................................................................. Go to TG90
See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Pinpoint Tests/TG - Electronic Transmission - Continuous
Memory Service Codes/TG90 - Perform Drive Cycle Test
DTC 649
Electronic Pressure Control higher or lower than expected.
KOEO Memory Code ............................................................................................................................................................................. Go to TG90
See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Pinpoint Tests/TG - Electronic Transmission - Continuous
Memory Service Codes/TG90 - Perform Drive Cycle Test
DTC 651
Electronic Pressure Control circuit failure.
KOEO Memory Code ............................................................................................................................................................................. Go to TG90
See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Pinpoint Tests/TG - Electronic Transmission - Continuous
