1986 TOYOTA CAMRY V20 brake

Diagnosis System
OUTPUT OF DIAGNOSTIC CODES
1. READ TYPE A CODE
(a) Turn the ignition switch on.
(b) Turn the set/coast switch on, and keep it on.
(e) Push the main switch on.
(d) Turn the set/coast switch oft.
(e) Meet the conditions listed below.
(f) Read the diagnostic code on the main switch indica-
tor.
HINT:
wTo save time performing the next test, do not turn off the
ignition switch when steps (a) ± (f) are completed.
wChecking of No. 4 code is done with the vehicle jacked
up and the engine idling.
wIf there is no indication code, perform diagnosis ±and
inspection. (See page Be±74)
Each cancel switch on (Stop light switch,
Parking brake switch, Clutch switch,
Neutral start switch)Each cancel switch circuit is
normal.Set/coast switch circuit is
normal.
Vacuum switch circuit is
normal.Resume/ accel switch
circuit is normal.
Speed sensor circuit is
normal.Speed sensor circuit is
normal.
Drive 30 km/h 0 9 mph) or belowDrive 40 km/h (25 mph) or overResume/accel switch on Set/coast switch on
Vacuum switch on
Indication code ConditionsDiagnosisNo.
± BODY ELECTRICAL SYSTEMCruise Control SystemBE±71

Setting speed does not cancel when shifted to ºNº
range (A/T only).Setting speed does not cancel when parking brake
pulled up.Vehicle speed does not decrease when coast switch
turned on.
Setting speed does not cancel when clutch pedal
depressed (M/T only).Vehicle speed does not return to memorized speed
when resume switch turned on.
Setting speed does not cancel when brake pedal
depressed.Vehicle speed fluctuates when set switch turned on.
Cruise control will not disengage even about
40 km/h (25 mph).Vehicle speed does not accelerate when accel
switch turned on.
A short period after the O/D cut, (Approx.
within 14 seconds) the O/D wilt resume. Speed can be set below about 40 km/h (25 mph).Inspect No.5 of type A code.
Inspect No.6 of type A code. Return and acceleration response is sluggish.
Troubleshooting
Setting speed deviates on high side.
Setting speed deviates on low side.
Inspect No.4 of type A code. Cruise control does not operate.
Inspect No.4 of type A code.Inspect No. 1 of type A code.
Inspect No.4 of type A code.
Inspect No.4 of type A code.Inspect No.3 of type A code.Inspect No.2 of type A code.(a) Inspect type A
codes.
(e) All codes are normal.(b) Inspect type6 codes.Inspection item
ProblemNo.
± BODY ELECTRICAL SYSTEMCruse Control SystemBE±73

INSPECT GROUND CONNECTION
Disconnect connector from stop light switch.
Is there continuity between terminal 3 of wire
harness side connector and body ground?wOpen circuit in wire harness between terminal 3
and body ground.
wBody ground faulty.
INSPECT STOP LIGHT SWITCH OPERATION
Is stop light switch operation normal?
(See page BE±89)
INSPECT STOP FUSE CIRCUIT
Is there battery voltage between terminal 16 and body
ground with brake pedal released?
INSPECT STOP LIGHT SWITCH CIRCUIT
Is there battery voltage between terminal 15 and body
ground with brake pedal depressed?Short circuit in wire harness between terminal
16 of computer or terminal 1 of stop light
switch and fuse.
Open circuit in wire harness between terminal 16 of
computer and STOP fuse.
Open circuit in wire harness between terminal 15 of
computer and terminal 3 of stop light switch. Disconnect connector from computer and inspect
connector on wire harness side as follows.
INSPECTION OF STOP LIGHT SWITCH CIRCUIT
Connect connector to stop light switch.Replace fuse.
Is operation normal?
Replace stop light switch. Turn ignition switch off.
Is STOP fuse normal?
Replace computer.
STOP LIGHT SW
COMPUTER
Fuse faulty. Ye s
Ye sYe s Ye s
Ye sYe s
± BODY ELECTRICAL SYSTEMCruise Control SystemBE±81

INSPECT PARKING BRAKE SWITCH OPERATION
Disconnect connector from parking brake switch.
Is parking brake switch operation normal? (See page
BE±90) INSPECT GROUND CONNECTION
Disconnect connector from brake level warning switch.
Is there continuity between terminal 2 of wire harness side
connector and body gronud?
Short circuit in wire harness between terminal 12 of
computer and terminal 1 of parking brake switch,
terminal 1 of brake fluid level warning switch or terminal
2 of alternator. INSPECT BRAKE WARNING SWITCH
Is brake fluid level warning switch operation nomal?
(See page BE±38)
wOpen circuit in wire harness between terminal 2
and body ground.
wBody ground faulty.
INSPECTION OF PARKING BRAKE SWITCH CIRCUIT
Is there no voltage between terminal 12 and body ground
with parking brake pulled up?
!s there battery voltage between terminal 12 and body
ground with parking brake released? Disconnect connector from computer and inspect connector
on wire harness side as follows.
Open circuit in wire harness between terminal 12 of
computer and terminal of parking brake switch. INSPECT ALTERNATOR OPERATION
is alternator operation normal? (See page CH±4)
Remove CHARGE fuse and ignition switch tuned on. Connect the connector to brake warning switch.
Connect connector to parking brake switch.
BRAKE FLUID LEVEL
WARNING SWITCH
Replace brake warning switch.
Replace parking brake switch.
PARKING BRAKE SWITCH
Turn ignition switch off.
Replace computer.Replace alternator.
ALTERNATOR
COMPUTER
Ye s
Ye s Ye s
Ye s Ye sYe s
± BODY ELECTRICAL SYSTEMCruise Control SystemBE±82

Cruise Control Computer Circuit
INSPECTION OF COMPUTER CIRCUIT
Disconnect the computer and inspect the connector on
wire harness side as shown in the below.
Remove CHARGE fuse and
ignition switch turned on with
parking brake lever released. Clutch pedal released or shifted
into only range except
ºNº and ºPº range
Remove CHARGE fuse and
ignition switch turned on with
parking brake lever pulled up.
Apply vacuum approx. 170
mmHg (fi.69 in.Hg, 22.7 kPa)Turn ignition switch and main
switch on
Turn ignition switch and main
switch off
Turn ignition switch and main
switch off Turn ignition switch and main
switch on
Clutch pedal depressed or
shifted into ºNº range Clutch Switch
(M/T) or Neutral
Start Switch (A/T)1 pulse each 44 cm
(15.75 in.) Stop Light Switch
and Release Valve
Turn resume/accel switch offTurn resume/accel switch on Control Switch
(indicator circuit)
Connection or
measure rtem
Turn set/coast switch off Turn set/coast switch on
Control Switch
(resunne/accel)Control Switch
(set/coast)
Vehicle moving slowlyBrake pedal depressed
Parking Brake
SwitchBrake pedal releasedBrake pedal released
10 ± Body ground
13 ± Body ground16 ± Body ground
17 ± Body ground
12 ± Body ground11 ± Body ground15 ± Body ground Tester connection
Stop Light Switch
3 ± Body ground
5 ± Body ground
7 ± Body ground
1 ± Body ground 9 ± Body groundBattery voltageSpecified value
Battery voltage
Battery voltageBattery voltage
Battery voltage No continuity
Vacuum SwitchControl Switch
Vacuum PumpNo continuity Approx. 68

Speed Sensor
No continuity Approx. 30

No continuity
Body GroundControl Valve
No voltageNo voltage
Continuity
Continuity ContinuityContinuity Resistance
ContinuityContinuity
Continuity Continuity
ContinuityNo voltage
No vacuum
ContinuityContinuityContinuity
ContinuityNo vohage
Condition
Resistance Stop FuseCheck for
VoltageVoltage Voltage
Voltage
Voltage4±142±14
± BODY ELECTRICAL SYSTEMCruise Control SystemBE±88

Main Switch
INSPECTION OF MAIN SWITCH
INSPECT SWITCH CONTINUITY
(a) Connect the positive (+) lead from the battery to
terminal 3 and the negative () lead to terminal 5.
(b) Check that there is continuity b¿¿ween terminals 3
and 4 with the main switch pushed on.
Stop Light Switch
INSPECTION OF SWITCH
INSPECT SWITCH CONTINUITY
Inspect the switch continuity between terminals.
Control Switch
INSPECTION OF SWITCH
INSPECT SWITCH CONTINUITY
Inspect the switch continuity between terminals.(c) Check that there is no continuity between terminals 3
and 4 with the main switch pushed off.
If continuity is not as specified, replace the switch.
If continuity is not as specified, replace the switch.
If continuity is not as specified, replace the switch.
Switch free
(Brake pedal depressed)
Switch pin pushed
(Brake pedal released)RESUME/ACCEL Switch position
Switch positionSET/COAST
Terminal Terminal
OFF
± BODY ELECTRICAL SYSTEMCruise Control SystemBE±89

Clutch Switch
INSPECTION OF SWITCH
INSPECT SWITCH CONTINUITY
(a) Check that there is continuity between terminals with
the switch free.
(Clutch pedal depressed)
(b) Check that there is no continuity between terminals
with the switch pin pushed.
(Clutch pedal released)
If continuity is not as specified, replace the switch.
Parking Brake Switch
INSPECTION OF SWITCH
INSPECT SWITCH CONTINUITY
(a) Check that there is continuity between terminal and
switch set .nu^ with the switch free.
(Parking brake lever pulled up)
(b) Check that there is no cintinuity between terminal
and switch set nut with the switch pin pushed.
(Parking brake lever released)
If continuity is not as specified, replace the switch.
Neutral Start Switch
INSPECTION OF SWITCH
INSPECT SWITCH CONTINUITY
Check that there is continuity between terminals 2 and 3
with switch position ºPº and ºNº ranges.
If continuity is not as specified, replace the switch.
Speed Sensor
INSPECTION OF SENSOR
INSPECT SENSOR CONTINUITY
Check that there is continuity between terminals A and6
four times per each revolution of the shaft.
If continuity is not as specified, replace the sensor.
± BODY ELECTRICAL SYSTEMCruise Control SystemBE±90

BRAKE SYSTEM
± BRAKE SYSTEMBR±1