Cruise Control ECU Circuit

INSPECT ECU CIRCUIT

Disconnect connector and inspect connector on wire harness side as shown in the chart. (with Vacuum Type Actuator)

Check for

Measured item

Tester connection

Condition

Specified value

Continuity

TDCL circuit

1 - flround

Constant

No continuity

Terminal Te and E1 connected

Continuity

Control switch (main switch)

6 - ground

Main switch position

OFF

No continuity

ON

Continuity

Water temp. switch and 0/D main switch

7 - gmund

Engine coolant is Cold

, Continuity

Engine coolant is Hot

O/D main switch position

OFF

No continuity

ON

Continuity

Neutral start switch (A/T)

13 - ground

Shift lever position

N or P

Continuity

L,2, D or R

No continuity

Clutch switch ( M /T)

13 - -ground

Clutch pedal position

released

No continuity

depressed

Continuity

Parking brake switch

14 - ground

Parking brake lever position

released

No continuity

pulled

Continuity

Ground connection

1 & - ground

Constant

Continuity

Resistance

Actuator (release valve)

3 - 16

Brake pedal position

released

Approx. 68Q

depressed

No continuity

Actuator (control valve)

5-16

Constant

Approx. 30 0

ECT No. 2 solenoid valve

9 ■ ground

Constant

Approx. 13Q

Control switch

IS-flr&vni

Control switch position

OFF

No continuity

R ES/ACC

Approx. 68Q

SET/COAST

Approx. 198 0

CANCEL

Approx. 418Q

Voltage

CC indicator

4 g-round

Ignition switch position

LOCK or ACC

No voltage

ON

Battery voltage

Speed sensor

B - Qroui»d

With ignition switch on, speedometer shaft or speed sensor shaft turned.

Voltage changes repeatedly

Power source

lÎ-firûgrtd

Ign

ition switch position

LOCK or ACC

No voltage

ON

Battery voltage

Stop light

T7 - ground

Br

3ke pedal position

released

No voltage

depressed

Battery voltage

1

STOP fuse

Î0 - pround

Constant

Battery voltage

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ConiSCtHr 'S'

ConnwKtf "a"

i

»

jy

■i

il

»

T

(with Motor Type Actuator)

Check for

Measured item

Tester connection

Condition

Specified value

Continuity

Neutral start switch (AT)

A-4 - ground

Shift lever position

N or P

Continuity

L,2,D or R

No continuity

Clutch switch (M /T)

A-4 - ground

Clutch pedal position

released

No continuity

depressed

Continuity

Parking brake switch

a-5 - -groufkJ

Parking brake lever position

released

No continuity

pulled

Continuity

Control switch

as - ground

Main switch position

OFF

No continuity

ON

Continuity

Ground connection

A-& - ground

Constant

Continuity

Water temp. switch and O/D main switch

H 2 ground

Engine coolant temp. is Cold

Continuity

Engine coolant temp. is Hot

O/D main switch position

OFF

No continuity

ON

Continuity

Actuator (motor)

B-4 - B-m

Actuator arm

max. OPEN

(B-4 -

B-10) Cortliriuily

position

max. CLOSE

(B-10 -

B'4) Continuity

any position except above position

(R-4 ~

B-10} Continuity

TDCL circuit

B-7 - ground

Constant

Continuity

Terminals Tc and E1 connected

Continuity

Throttle position sensor ( I D L)

3-9 - ground

Acceleration pedal position

released

Continuity

depressed

No continuity

Resistance

Actuator (position sensor)

A 10 - A-t2

Constant

Appfox. 2 kfl

A-10 - a-1-1

Actuator arm turned

Resistance change even

ECT No. 2 solenoid valve

B-1 - ground

Constant

Aoprûx 13 il

Actuator (Safety magnetic clutch)

3 3 ground

Brake pedal position

released

appro*. aa.& i'j

depressed

No continuity

Control switch

fl-0 - ground

Control switch position

OFF

No continuity

RES/ACC

Apprpi. 60 fl

SET/COAST

Appfox. 19$ il

CANCEL

Appio*. 41 9 i>

Voltage

Power source

A'l - ground

Ignition switch position

LOCK or ACC

No voltage

ON

Battery voltage

STOP fuse

A-2 - ground

Constant

Battery voltage

Stop light

A-3 - ground

Brake pedal position

released

No voltage

depressed

Battery voltage

Speed sensor

A-7 - ground

With ignition switch 4N, speedometer shaft or

Voltage changes

speed sensor shaft turned.

repeatedly

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  • giordana
    Where is the cruise control ecu located on a 91 celica?
    1 year ago

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