Diagnostic Procedure

STEP	INSPECTION		ACTION
1	VERIFY TIRE CONDITION Inspect the tire size and air pressure. Is the tire of specified size and air pressure?	Yes	Go to the next step.
1		No	Replace with a specified tire size or adjust the air pressure of each specified tire to the specified value.
2	INSPECT WHEEL-SPEED SIGNAL Display the following DSC CM PIDs using the M-MDS (IDS). (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)] .) WSPD_LF WSPD_LR WSPD_RF WSPD_RR Are the monitoring values displayed uniformly while driving?	Yes	Go to the next step.
2		No	Perform the following inspections: ABS wheel-speed sensor installation inspection Is the ABS wheel-speed sensor installation normal? ABS sensor rotor installation inspection Is the ABS sensor rotor installed twisted? (may cause output of abnormal wave pattern at high speeds.) Are there missing teeth on the sensor rotor? If there is any malfunction, repair or replace the malfunctioning location.
3	INSPECT TCM FOR POOR GND Disconnect the TCM connector. Is the resistance between the GND terminal at the TCM connector and the body GND less than 5.0 ohms ?	Yes	Go to the next step.
3		No	Repair or replace the wiring harness for a possible open circuit. Reconnect the TCM connector.
4	VERIFY IF MALFUNCTION CAUSE IS INPUT SIGNAL OR TRANSAXLE (INCLUDING CONTROL VALVE BODY) Inspect the value at the following PCM and TCM f using the M-MDS (IDS). (See ON-BOARD DIAGNOSTIC TEST .) (See ON-BOARD DIAGNOSTIC SYSTEM PID/DATA MONITOR INSPECTION .) PCM PID: APP TCM PIDs: THOP TSS OSS VSS Are the PID values normal? (See PCM INSPECTION .)	Yes	Overhaul the control valve body and repair or replace any malfunctioning parts. (See Automatic Transaxle Workshop Manual FS5A-EL.) If any problem remains, overhaul the transaxle and repair or replace any malfunctioning parts. (See Automatic Transaxle Workshop Manual FS5A-EL.)
4		No	Repair or replace any malfunctioning parts according to the inspection result.
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 Bulletins and/or On-line Repair 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 TCM. (See TCM REMOVAL/INSTALLATION .)