Diagnostic Procedure

STEP	INSPECTION		ACTION
1	VERIFY MALFUNCTION CONDITION Does the shift shock occur only when the engine is cold?	Yes	Go to the next step.
1		No	Go to Step 3.
2	VERIFY IF MALFUNCTION CAUSE IS TCM FOR POOR GND OR INPUT SIGNAL 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	Inspect the value at the following PCM and TCM PIDs using the M-MDS (IDS). (See ON-BOARD DIAGNOSTIC TEST .) (See ON-BOARD DIAGNOSTIC SYSTEM PID/DATA MONITOR INSPECTION .) PCM PIDs: APP RPM TCM PIDs: THOP TFT TFTV Repair or replace any malfunctioning parts according to the inspection result. (See PCM INSPECTION .)
2		No	Repair or replace the wiring harness for a possible open circuit. Reconnect the TCM connector.
3	DETERMINE IF MALFUNCTION CAUSE IS TRANSAXLE POSITION SIGNAL OR CONTROL SIGNAL Perform the stall test. (See MECHANICAL SYSTEM TEST .) Is the stall speed normal?	Yes	Go to the next step.
3		No	Go to Step 5.
4	VERIFY IF MALFUNCTION CAUSE IS TRANSAXLE POSITION SIGNAL OR TRANSAXLE (INCLUDING CONTROL VALVE BODY) Inspect the value at the following TCM PID using the M-MDS (IDS). (See ON-BOARD DIAGNOSTIC SYSTEM PID/DATA MONITOR INSPECTION .) TR Is the PID value normal?	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	INSPECT THROTTLE OPENING SIGNAL FOR MALFUNCTION Inspect the value at the following TCM PID using the M-MDS (IDS). (See ON-BOARD DIAGNOSTIC SYSTEM PID/DATA MONITOR INSPECTION .) THOP Is the PID value normal?	Yes	Go to the next step.
5		No	Repair or replace any malfunctioning parts according to the inspection result.
6	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.
6		No	Repair or replace the wiring harness for a possible open circuit. Reconnect the TCM connector.
7	VERIFY IF MALFUNCTION CAUSE IS LINE PRESSURE CONTROL SIGNAL OR TRANSAXLE (INCLUDING CONTROL VALVE BODY) Inspect the value at the following TCM PID using the M-MDS (IDS). (See ON-BOARD DIAGNOSTIC SYSTEM PID/DATA MONITOR INSPECTION .) LPS Is the PID value normal?	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.)
7		No	Repair or replace any malfunctioning parts according to the inspection result.
8	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 .)