POWER ASSIST SYSTEMS POWER STEERING SYSTEM TEST MODE PROCEDURE

NOTICE:: The torque sensor zero point calibration is performed automatically when the test mode inspection is conducted after the power steering ECU assembly has been replaced.

HINT:: ·

Speed sensor signals can be checked easily in test mode.

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Test mode code C1571 is stored during transition to test mode. This code does not indicate a malfunction since the code will be cleared when the ECU determines that the sensor is normal.

·

The test mode code is cleared simultaneously when test mode is terminated.

TEST MODE START-UP

Turn the ignition switch off.

Connect the GTS to the DLC3.

Start the engine.

Turn the GTS on.

Switch the power steering ECU assembly to the test mode. Enter the following menus: Chassis / EMPS / Signal Check.

Chassis > EMPS > Utility

Tester Display
Signal Check

50005 142 3

CHECK TEST MODE DISPLAY

0.135,0.135 0.49,0.427 0.354,0.292 10 false *a 1.406,1.844 1.719,2 0.313,0.156 10 false *b 0.594,0.99 0.917,1.229 0.323,0.24 10 false *c 0.583,1.406 0.938,1.635 0.354,0.229 10 false *d 2.448,1.646 2.802,1.896 0.354,0.25 10 false (*e) 1.615,0.542 1.927,0.698 0.313,0.156 10 false *b

*a	EPS warning light test mode
*b	0.125 seconds
*c	ON
*d	OFF
*e	4 Hz

The EPS warning light blinks as shown in the illustration when test mode is entered.

NOTICE:: If the torque sensor zero point calibration has not been performed, the EPS warning light comes on until the torque sensor zero point calibration is completed, and shows the test mode blink pattern after the torque sensor zero point calibration is completed.

CHECK VEHICLE SPEED SIGNAL

Drive the vehicle until the vehicle speed reaches 10 km/h (6 mph) or more.

2.135,1.292 2.625,1.479 0.49,0.188 10 false 10 (6) 2.26,1.854 2.563,2.021 0.302,0.167 10 false 0 2.125,1.583 2.615,1.771 0.49,0.188 10 false 4 (2.5) 0.26,0.156 0.573,0.313 0.313,0.156 10 false *a 0.333,1.531 0.646,1.688 0.313,0.156 10 false *b 0.375,2.698 0.688,2.854 0.313,0.156 10 false *c 2.302,0.75 2.615,0.906 0.313,0.156 10 false *d 6.104,1.927 6.417,2.083 0.313,0.156 10 false *e 1.906,2.583 2.219,2.74 0.313,0.156 10 false *f 1.896,2.865 2.219,3.219 0.323,0.354 10 false *g 2.531,3.083 2.844,3.24 0.313,0.156 10 false *h 4.25,3.115 4.563,3.271 0.313,0.156 10 false *i

*a	When system is normal	*b	Vehicle speed
*c	EPS warning light	*d	km/h (mph)
*e	Time	*f	ON
*g	OFF	*h	4 Hz blink
*i	The light blinks until test mode code C1571 is cleared. The light goes off at 10 km/h or more.	-	-

READ TEST MODE CODE

Check for DTCs in test mode.

NOTICE:: Test mode code is cleared when test mode is terminated.

END OF TEST MODE

Return to normal mode by following the instructions on the GTS screen.

Turn the ignition switch off and disconnect the GTS.

Test Mode Code
Test Mode Code	Detection Item	Condition to Clear Code	Trouble Areas
C1571 (Click here())	Vehicle speed check	Vehicle speed 10 km/h (6 mph) or more	If the code cannot be cleared, any of the following areas may be malfunctioning: · Speed sensor · Combination meter assembly · Power steering ECU assembly · Wire harness and connector