625-639
NOTEKOEO 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 625
Electronic Pressure Control driver open in Powertrain Control Module.
KOEO Hard Code Go to TC10
TC10 - Check VPWR to Solenoid
KOEO Memory Code Go to TG90
TG90 - Perform Drive Cycle Test
DTC 626
Coast Clutch Solenoid (CCS) circuit failure during KOEO self-test.
KOEO Hard Code Go to TC1
TC1 - Enter Output State Diagnostic Test Mode
DTC 627
Torque Converter Clutch solenoid circuit failure.
KOEO Hard Code Go to TC1
TC1 - Enter Output State Diagnostic Test Mode
DTC 628
Excessive converter clutch slippage.
KOEO Memory Code Go to TG90
TG90 - Perform Drive Cycle Test
DTC 629
Torque Converter Clutch solenoid circuit failure.
KOEO Hard Code Go to TC1
TC1 - Enter Output State Diagnostic Test Mode
DTC 631
Transmission Control Indicator Lamp circuit failure during KOEO self-test.
KOEO Hard Code Go to TB3
TB3 - Diagnostic Trouble Codes 97, 623 and 631
DTC 632
Transmission Control Switch circuit did not change states during KOER self-test.
KOER Hard Code Go to TB2
TB2 - Diagnostic Trouble Codes 65, 632 and 653
DTC 633
4x4L switch closed during KOEO self-test.
KOEO Hard Code Go to TB1
TB1 - Diagnostic Trouble Codes 47, 633 and 691
DTC 634
Transmission Range voltage higher or lower than expected.
KOEO Hard Code Go to TD1
TD - Manual Lever Position (MLP) Sensor
KOEO Memory Code Go to TG90
TG90 - Perform Drive Cycle Test
DTC 636
Transmission fluid temperature higher or lower than expected.
KOEO Hard Code Go to TE1
TE1 - Sensor Output Outside Test Range
KOER Hard Code Go to TE1
TE1 - Sensor Output Outside Test Range
DTC 637
Transmission fluid temperature sensor circuit above maximum voltage, -40 degrees C (-4O degrees F) indicated, circuit open.
KOEO Hard Code Go to TE10
TE10 - Attempt To Generate DTC 66 or 638
KOEO Memory Code Go to TG90
TG90 - Perform Drive Cycle Test
DTC 638
Transmission fluid temperature sensor circuit below minimum voltage, 143 degrees C (29O degrees F) indicated, circuit shorted.
KOEO Hard Code Go to TE20
TE20 - Attempt To Generate DTC 56 or 637
KOEO Memory Code Go to TG90
TG90 - Perform Drive Cycle Test
DTC 639
Insufficient input from Transmission Speed Sensor.
KOER Hard Code Go to TF1
TF1 - Check TSS/OSS Connector Continuity
KOEO Memory Code Go to TF90
TF90 - Complete Transmission Drive Cycle