Retrieving Diagnostic Trouble Codes

WARNING: This page is about a different car, the 2000 Lexus SC 400, 2000 Lexus SC 300, 1999 Lexus SC 400, and 1999 Lexus SC 300. However, it is still accessible from the selected car via links, so may be relevant.

Ensure battery is fully charged. Turn ignition on. ABS warning light should illuminate and then go out after 3 seconds. If ABS warning light does not illuminate, check ABS warning light circuit. See ABS WARNING LIGHT CIRCUIT under SYSTEM TESTS.
Disconnect short pin from Data Link Connector No. 1 (DLC1). See Fig 1. DLC1 is located in left side of engine compartment, next to strut tower. Using a fused jumper wire or Service Connector (SST 09843-18020), connect terminals Tc and E1 of Data Link Connector No. 1 (DLC1) or Data Link Connector No. 2 (DLC2). See Fig 2. DLC2 is located under left side of instrument panel, near kick panel.
Turn ignition on. If a malfunction is detected, ABS warning light will begin to flash a 2-digit DTC after 4 seconds. ABS warning light will flash first digit, followed by a 1.5 second pause and then light will flash second digit.
Count number of flashes to obtain digits of 2-digit code. If 2 or more codes are stored, a 2.5 second pause will separate codes. See DIAGNOSTIC TROUBLE CODE IDENTIFICATION table for code diagnosis.
If ABS is functioning properly, a normal code will be set. During normal code, 2 seconds will elapse, and then ABS warning light will blink once every .25 second.
After replacing or repairing malfunctioning components, clear diagnostic trouble codes. See CLEARING DIAGNOSTIC TROUBLE CODES .

Fig 1: Locating Short Pin

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 2: Identifying Data Link Connector (DLC1 & DLC2) Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

DIAGNOSTIC TROUBLE CODE IDENTIFICATION

DTC

Probable Cause

Open Or Short In ABS Solenoid Relay Circuit

Short To Voltage In ABS Solenoid Relay Circuit

Open Or Short In ABS Motor Relay Circuit

Short To Voltage In ABS Motor Relay Circuit

Open Or Short In ABS/TRAC Actuator Solenoid SFRR Or SFRH Circuit

Open Or Short In ABS/TRAC Actuator Solenoid SFLR Or SFLH Circuit

Open Or Short In ABS/TRAC Actuator Solenoid SRR (SRRR) Or SRH (SRRH) Circuit

Open Or Short In ABS/TRAC Actuator Solenoid SRLR Or SRLH Circuit

25 ⁽¹⁾

Open Or Short In TRAC Actuator Solenoid SMC Circuit

26 ⁽¹⁾

Open Or Short In TRAC Actuator Solenoid SPC Circuit

27 ⁽¹⁾

Open Or Short In TRAC Actuator Solenoid SRC Circuit

31 ⁽²⁾

Right Front Wheel Speed Sensor Signal Malfunction

32 ⁽²⁾

Left Front Wheel Speed Sensor Signal Malfunction

33 ⁽²⁾

Right Rear Wheel Speed Sensor Signal Malfunction

34 ⁽²⁾

Left Rear Wheel Speed Sensor Signal Malfunction

Low Battery Voltage

43 ⁽¹⁾

ABS Control System Malfunction

44 ⁽¹⁾

Open Or Short In NE Signal Circuit

Open In Brakelight Switch Circuit

ABS Pump Motor Locked Or Open Ground Circuit In ABS Pump Motor

51 ⁽¹⁾

Engine Control Module (ECM) System Malfunction

52 ⁽¹⁾

Brake Fluid Level Low, Open Circuit In Brake Fluid Level Warning Switch

53 ⁽¹⁾

ECM Communication Circuit Malfunction

71 ⁽³⁾

Right Front Speed Sensor Signal Voltage Is Low

72 ⁽³⁾

Left Front Speed Sensor Signal Voltage Is Low

73 ⁽³⁾

Right Rear Speed Sensor Signal Voltage Is Low

74 ⁽³⁾

Left Rear Speed Sensor Signal Voltage Is Low

75 ⁽³⁾

Abnormal Change In Output Signal From Right Front Speed Sensor

76 ⁽³⁾

Abnormal Change In Output Signal From Left Front Speed Sensor

77 ⁽³⁾

Abnormal Change In Output Signal From Right Rear Speed Sensor

78 ⁽³⁾

Abnormal Change In Output Signal From Left Rear Speed Sensor

Always On

ABS/TRAC ECU Malfunction

Always On ⁽¹⁾

ABS/TRAC ECU Malfunction, TRAC OFF Switch On

⁽¹⁾	This code also applies to Traction Control System. For DTC tests not included in this article, See TRACTION CONTROL article.

⁽²⁾	After performing repairs, clear DTC. See CLEARING DIAGNOSTIC TROUBLE CODES . DTC can also be cleared by driving vehicle at 12 MPH for 30 seconds or more.

⁽³⁾	See SPEED SENSOR DIAGNOSTIC CODE IDENTIFICATION under SPEED SENSOR SIGNAL CHECK.