Initial Inspection and Diagnostic Overview

PROBLEM SOLVING

Quick Reference Fault Chart
Condition(s):
Normal transmission operation but fault codes stored
Possible Source(s):

^ NOTE: If P0706 is logged ignore P0742

Output speed sensor circuit fault
^ TCM faulty
^ ABS system fault (this code may log erroneously following an ABS problem)
^ Position switch and D to 4 switch circuit fault
^ P R 4 circuit fault
Action(s) to take:
^ GO to P0721
^ GO to P1603
^ GO to P0742
Sport mode will not select
Possible Source(s):
^ Mode switch circuit fault
Action(s) to take:
^ GO to P0790
Mode switch state lamp not working
Possible Source(s):
^ Mode switch supply
^ Mode switch circuit fault
Action(s) to take:
^ GO to P0790
Poor, or reduced shift quality
Possible Source(s):
^ Presence of EMS faults (may affect the accuracy of the torque signal)
Action(s) to take:
^ GO to EMS
Possible Source(s):
^ Transmission temperature sensor circuit
Action(s) to take:
^ GO to P0710
Out of sequence shift
Possible Source(s):
^ Output / input speed sensor circuit fault
^ Mechanical fault (check all other operations)
Action(s) to take:
^ GO to P1731
No torque converter lock-up
Possible Source(s):
^ P R 4 circuit fault
Action(s) to take:
^ GO to P0743
Possible Source(s):
^ Mechanical fault, should P R 4 be OK
Action(s) to take:
^ GO to P0741
Harsh shifts, engine stalling (torque converter stuck on)
Possible Source(s):
^ P R 4 circuit fault
^ Mechanical fault, should P R 4 be OK
Action(s) to take:
^ GO to P0742
Default to 4th gear
Possible Source(s):
^ Solenoid / pressure regulator supply from TCM
Action(s) to take:
^ GO to P0702
Possible Source(s):

^ NOTE: If the code logs when 3rd is selected, then the D to 4 switch is the most probable cause If the code logs when D is selected from the LH side of the gate, then check selector cable adjustment

'J gate' or selector cable out of adjustment
^ D to 4th switch
^ Rotary position switch circuit
Action(s) to take:
^ GO to P0706
Possible Source(s):
^ Input speed sensor circuit fault
^ Input speed sensor faulty
Action(s) to take:
^ GO to P0715
Possible Source(s):
^ Solenoid #1 circuit fault
Action(s) to take:
^ GO to P0753
Possible Source(s):
^ Solenoid #2 circuit fault
Action(s) to take:
^ GO to P0758
Possible Source(s):
^ Solenoid #3 circuit fault
Action(s) to take:
^ GO to P0763
Possible Source(s):
^ TCM faulty
Action(s) to take:
^ GO to P1605 and P1608
Possible Source(s):
^ ABS fault
^ CAN circuit fault between ABS/TCCM and TCM
^ Output speed sensor circuit fault
Action(s) to take:
^ GO to P1720
Possible Source(s):
Mechanical fault (check all other operations)
^ Action(s) to take:
^ GO to P1726
Possible Source(s):
^ Pressure regulator, solenoid or speed sensor circuit fault
^ Mechanical fault - transmission defaulted to 5th?
Action(s) to take:
^ GO to P1734
Possible Source(s):
^ Pressure regulator #1 circuit fault
Action(s) to take:
^ GO to P1745
Possible Source(s):
^ Pressure regulator #2 circuit fault
Action(s) to take:
^ GO to P1746
Possible Source(s):
^ Pressure regulator #3 circuit fault
Action(s) to take:
^ GO to P1747
Possible Source(s):
^ Pressure regulator #4 circuit fault
Action(s) to take:
^ GO to P0743
Possible Source(s):
^ Pressure regulator #5 circuit fault
Action(s) to take:
^ GO to P1748
Possible Source(s):
^ Mechanical fault - transmission defaulted during 2nd to 3rd or 3rd to 4th shift?
Action(s) to take:
^ GO to P1779
Possible Source(s):
^ Power (ignition) supply fault to TCM
^ Vehicle battery charging system fault
Action(s) to take:
^ GO to P1 789 and P1 793
Possible Source(s):
^ Incompatible ECM, ABS/TCCM, TCM or INST - check part number
Action(s) to take:
^ GO to P1795
Possible Source(s):
^ CAN circuit fault
^ Check fault code(s) in ECM, ABS/TCCM or INST and rectify as required
Action(s) to take:
^ GO to P1796
Possible Source(s):
^ Faulty ECM
^ CAN circuit fault between ECM and TCM
Action(s) to take:
^ GO to P1797
Default to 5th gear
Possible Source(s):
^ Output speed sensor circuit fault
^ Mechanical fault (check pulling away from standstill performance)
Action(s) to take:
^ GO to P1722
Possible Source(s):
^ Output / input speed sensor circuit fault
^ Mechanical fault (check operation of transmission in 2nd, 3rd and 4th gears)
Action(s) to take:
^ GO to P1730