Retrieving Trouble Codes

Codes from CC ECU self-diagnostic system are retrieved through self-test diagnostic Data Link Connector (DLC). Test drive vehicle to allow fault codes to set in CC ECU memory. If CRUISE indicator light flashes 5 times 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. If ignition switch is turned to OFF position, stored trouble codes will be erased from CC ECU memory. Connect jumper wire between DLC terminals E1 and Tc. See Fig 1.
If any code is present, perform test(s) in order given. See CC ECU TROUBLE CODE DEFINITION table. If no codes are present and CRUISE indicator light begins flashing on and off every .25 second, perform NORMAL code tests in order given. See CC ECU TROUBLE CODE DEFINITION table for correct test order and go to TESTING & DIAGNOSIS for appropriate tests. If no codes are present and CRUISE indicator light does not flash on and off every .25 second, and cruise control system malfunction still exists, perform CRUISE CONTROL CIRCUIT FUNCTION TEST under TROUBLE SHOOTING.

Fig 1: Identifying DLC Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

CC ECU TROUBLE CODE DEFINITION

Code No.

Diagnosis Problem

⁽¹⁾ Perform Test No.

Normal

Indicator Light Flashes 5 Times, CC System Can Not Be Set Or Does Not Operate

⁽²⁾3 , 6 , 7 , 10 ⁽³⁾, 4 ⁽⁴⁾

Overcurrent/Short In Motor Circuit

⁽²⁾4 ⁽⁴⁾

Open In Magnet Clutch Circuit Or Overcurrent/Short In Magnet Clutch Circuit

⁽²⁾4 , 6 ⁽⁴⁾

Position Sensor Circuit Fault Or Open In Actuator Motor Circuit

⁽²⁾, 4 ⁽⁴⁾

No Speed Sensor Signal To CC ECU

5 ⁽⁴⁾

23 ⁽⁵⁾

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

⁽³⁾5 , 4 ⁽⁴⁾

Short In Control Switch Circuit

3 ⁽⁴⁾

Control Does Not Turn Off Before Switching

3 ⁽⁴⁾

Faulty CC ECU

⁽⁴⁾

⁽¹⁾	Perform test numbers in order given.

⁽²⁾	Check wiring harness and connectors.

⁽³⁾	Check speed control cable function.

⁽⁴⁾	Check CC ECU. See CRUISE CONTROL ECU CIRCUIT TEST . Replace ECU as necessary and recheck system operation.

⁽⁵⁾	If speed set can be maintained when speed control switch is again set to SET/COAST position, there is no malfunction.