NO.29 POOR VEHICLE ACCELERATION/PERFORMANCE[LA4AX-EL (CD4E)]

id0503a2806500

29

Poor vehicle acceleration/performance
POSSIBLE CAUSE
•  Powertrain control system malfunction
•  Internal and external shift linkage malfunction
•  Torque converter clutch malfunction
•  Converter OWC malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION
1
Powertrain control system
•  Are there any malfunctions with the following?
―  Engine
―  Electrical input/output
―  Vehicle wiring harness
―  PCM
―  Transaxle fluid temperature (TFT) sensor
―  Throttle position (TP) sensor
―  O/D OFF switch
Yes
Perform OBD test
If the problem is engine related, go to the engine symptom troubleshooting
(See ENGINE SYMPTOM TROUBLESHOOTING[AJ (3.0L Duratec)].)
If the problem is not engine related, perform DTC troubleshooting
(See AUTOMATIC TRANSAXLE ON-BOARD DIAGNOSTIC FUNCTION[LA4AX-EL (CD4E)].)
No
Go to the next step
2
Internal and external shift linkages
•  Do any of the following malfunctions exist?
―  Damaged
―  Misadjusted
―  Misassembled
Yes
Service if necessary
No
Go to the next step
3
Torque converter clutch
•  Is the torque converter clutch always applied?
Yes
Perform the Symptom Troubleshooting No.28
(See SYMPTOM TROUBLESHOOTING ITEM TABLE[LA4AX-EL (CD4E)].)
No
Go to the next step
4
Converter one‐way clutch (OWC)
•  Is the converter OWC damaged?
Yes
Service if necessary
No
Perform the road test and verify the proper shift schedule and engagements
Service if necessary
(See ROAD TEST[LA4AX-EL (CD4E)].)
5
•  Verify the test results.
―  If normal, return to the diagnostic index to service any additional symptoms.
―  If the malfunction remains, inspect the related Service Information and perform repair or diagnosis.
•  If the vehicle is repaired, troubleshooting is completed.
•  If the vehicle is not repaired or additional diagnostic information is not available, replace the PCM.