Normal Mode

Normal Mode is used for routine testing of vehicle. Turn ignition switch to the ON position, but do not start engine. Turn O/D switch on. Using a jumper wire, connect terminals TE1 and E1 at TDCL or check connector. See Figure. Read the trouble codes as indicated by the number of flashes of O/D OFF light.
NOTE: If O/D OFF light will not flash, refer to O/D SWITCH & O/D OFF LIGHT CIRCUIT chart.
If no transmission trouble codes are present, the light will blink continuously 2 times per second. Trouble code flashes will be at the rate of one flash per second with longer pauses separating digits and codes. Refer to LS400 AUTOMATIC TRANSMISSION CODE IDENTIFICATION table. Refer to appropriate transmission diagnostic chart. For location of transmission components, see Figure.
If a malfunction is encountered with transmission and no diagnostic codes are set, refer to LS400 DIAGNOSIS BY SYMPTOM (TRANSMISSION). To clear codes, see CLEARING CODES in this article.

NOTE: If both speed sensors No. 1 and No. 2 fail simultaneously, no diagnostic code will be set and fail-safe system will not function. After this occurs, when driving in D range, transmission will not upshift from first gear, regardless of vehicle speed.

LS400 AUTOMATIC TRANSMISSION CODE IDENTIFICATION

Code

Signal Affected

N/A

⁽¹⁾ Normal

Speed Sensor No. 1 Signal

Solenoid Valve No. 4 Signal

Speed Sensor No. 2 Signal

Solenoid Valve No. 1 Signal

Solenoid Valve No. 2 Signal

Solenoid Valve No. 3 Signal

Overdrive Direct Clutch Speed Sensor Signal

Kickdown Switch Signal

⁽¹⁾	O/D OFF light will blink 2 times every second.