Retrieving Trouble Codes

Codes from CC ECU self-diagnostic system are retrieved through self-test diagnostic Data Link Connector 1 (DLC1). Test drive vehicle to allow trouble codes to set in CC ECU memory. If CRUISE indicator light begins to flash while driving or cruise control will not set or operate, check for trouble codes. Go to next step.
Stop vehicle and leave ignition switch in ON position. Locate Black DLC1 on driver side strut tower in engine compartment. Connect jumper wire between DLC1 terminal No. 3/E1 (Brown wire) and terminal No. 11/Tc (Violet wire). See Fig 1.
If any trouble code is present, perform test(s) in order given. See CRUISE CONTROL ECU TROUBLE CODE DEFINITION table. If no trouble codes are present and CRUISE indicator light begins flashing on and off every .25 seconds, system is normal. If no codes are present, CRUISE indicator light does not flash on and off, and cruise control system malfunction still exists, perform CRUISE CONTROL FUNCTION TEST under TROUBLE SHOOTING.

Fig 1: Identifying DLC1 Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

CRUISE CONTROL ECU TROUBLE CODE DEFINITION

Code No.

Diagnosis Problem

⁽¹⁾ Perform Test No.

Normal

Indicator Light Flashes On & Off

None

Continuous Output To Actuator Motor Acceleration Side

1 , 2 , 3 , 16 , ⁽²⁾

Overcurrent (Short) In Motor Circuit

1 , 2 , 3 , 16 , ⁽²⁾

Overcurrent (Short) In Magnetic Clutch Circuit

1 , 2 , 3 , 7 , 7 , 16 , ⁽²⁾

Open In Magnetic Clutch Circuit For 0.8 Second

1 , 2 , 3 , 7 , 16 ⁽²⁾

Actuator Position Sensor Detects Abnormal Voltage

1 , 2 , 3 , 16 , ⁽²⁾

Open In Actuator Motor Circuit

1 , 2 , 3 , 16 , ⁽²⁾

Position Sensor Signal Value Does Not Change When Motor Operates

1 , 2 , 3 , 16 , ⁽²⁾

Speed Sensor Signal Is Not Input To CC ECU

4 , 16 , ⁽²⁾

23 ⁽³⁾

Vehicle Speed Decreased 10 MPH Or More Below Speed Set During Cruise Control Operation

4 , 16 , ⁽²⁾

Short In Cruise ON-OFF (Main) Switch Circuit

5 , 6 , 16 , ⁽²⁾

Abnormal Voltage In Cruise ON-OFF (Main) Switch

5 , 6 , 16 , ⁽²⁾

Faulty Cruise Control ECU

16 , ⁽²⁾

Source Voltage Drop

12 , 13

Faulty Actuator Motor Circuit Or Actuator Magnetic Clutch Circuit

1 , 2 , 3 , 16 , ⁽²⁾

⁽¹⁾	Perform test numbers in order given.

⁽²⁾	Check CC ECU. See PIN VOLTAGE TESTS . Replace CC ECU as necessary.

⁽³⁾	If speed set can be maintained when cruise ON-OFF (main) switch is again set to SET/COAST position, there is no malfunction.