Toyota Corolla 2004 DIAGNOSTICS – CRUISE CONTROL SYSTEM

05–763

–DIAGNOSTICS CRUISE CONTROL SYSTEM (April, 2003)

057SF–02

DTC 21 OPEN VEHICLE SPEED SENSOR CIRCUIT

DTC 23 VEHICLE SPEED SIGNAL ABNORMAL

CIRCUIT DESCRIPTION

The vehicle speed sensor circuit is sent to cruise control ECU assy as a vehicle speed signal. For each rota­tion of the shaft, the vehicle speed sensor sends a signal through the combination meter assembly to the
cruise control ECU assy (See the following chart). The cruise control ECU assy calculates the vehicle speed
from this pulse frequency.

DTC No. DTC Detecting Condition Trouble Area

 Combination meter assembly

21

23  Vehicle speed sensor pulse is abnormal.

 Speed signal is not input to the cruise control ECU assy while

cruise control is set.

 Vehicle speed sensor
 Vehicle speed sensor circuit
 Cruise control ECU assy

 Vehicle speed sensor
 Cruise control ECU assy

WIRING DIAGRAM

C9
Combination Meter Assembly

10

W–G

9

V–W

W–G

(*1)

W–G

(*2)

Cruise Control ECU Assy

Center J/B

812

4C

10

IA3

II2

W–G

(*1)

4

W–G

(*2)

7

4C

From
Skid Control ECU
Assy

From
Vehicle Speed

V–W

C14

SPD

Sensor

2004 COROLLA (RM1037U)

*1: w/ ABS
*2: w/o ABS

I24194

928Author: Date:

05–764

INSPECTION PROCEDURE

1 INPUT SIGNAL CHECK

Input Signal

Drive at about
40 km/h (25 mph)
or below

Drive at about
40 km/h (25 mph)
or over

Indicator Light
Blinking Pattern

ON

Light

OFF

ON

Light

OFF

–DIAGNOSTICS CRUISE CONTROL SYSTEM (April, 2003)

(a) See input signal check on page 05–745.
(b) Check indicator light operation when driving with vehicle

speed above 40 km/h (25 mph), and with vehicle speed
below 40 km/h (25 mph).

OK:
Vehicle speed above 40 km/h (25 mph):
Indicator light blinks
Vehicle speed below 40 km/h (25 mph):
Indicator light stays ON

OK PROCEED TO NEXT CIRCUIT INSPECTION

SHOWN ON PROBLEM SYMPTOMS TABLE (See
page 05–754)

NG

2 CHECK SPEEDOMETER CIRCUIT (See page 05–645)

NG REPAIR O R REPLACE HARNESS, CONNECTOR

OR COMBINATION METER ASSEMBLY

OK

3 CHECK HARNESS AND CONNECTOR(BETWEEN CRUISE CONTROL ECU ASSY

AND COMBINATION METER ASSEMBLY)

(a) Check for open and short circuit in harness and connector between cruise control ECU assy and com-

bination meter assembly (See page 01–30).

NG REPAIR OR REPLACE HARNESS OR

CONNECTOR

OK

CHECK AND REPLACE CRUISE CONTROL ECU ASSY (See page 01–30)

2004 COROLLA (RM1037U)

929Author: Date: