Diagnostic Procedure

STEP	INSPECTION		ACTION
1	INSPECT ENGINE CONTROL SYSTEM FOR MALFUNCTION Inspect the engine condition. Is there any engine concern (i. e. rough idle)?	Yes	Go to the appropriate symptom troubleshooting. (See ENGINE CONTROL SYSTEM SYMPTOM DIAGNOSTIC INDEX .)
1		No	Go to the next step.
2	INSPECT TRANSAXLE INTERNAL FOR MALFUNCTION Does the noise stop when the solenoid connector is disconnected?	Yes	Go to the next step.
2		No	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.)
3	INSPECT INPUT SIGNAL FOR MALFUNCTION 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 PID: APP TCM PIDs: THOP OSS TSS Are the PID values normal? (See PCM INSPECTION .)	Yes	Go to the next step.
3		No	Repair or replace any malfunctioning parts according to the inspection result.
4	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.
4		No	Repair or replace the wiring harness for a possible open circuit. Reconnect the TCM connector.
5	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.)
5		No	Repair or replace any malfunctioning parts according to the inspection result.
6	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 .)