TOYOTA CAMRY 1999 Service Repair Manual

Input Signal
Indicator Light
Blinking Pattern
Clutch switch
OFF (Depress
clutch pedal)
LightON
OFFSW ON
SW OFF
± DIAGNOSTICSCRUISE CONTROL SYSTEM
DI±907
1142 Author: Date:
Clutch Switch Circuit
CIRCUIT DESCRIPTION
When the clutch pedal is depressed, the clutch switch sends a signal to the cruise control ECU. When the
signal is input to the cruise control ECU during cruise control driving, the cruise control ECU cancels cruise
control.
WIRING DIAGRAM
Refer to PNP switch circuit on page DI±904.
INSPECTION PROCEDURE
1 Check starter operation.
CHECK:
Check that the starter operates normally and that the engine starts.
NG Proceed to engine troubleshooting
(5S±FE: See page ST±1)
(1MZ±FE: See page ST±1).
OK
2 Input signal check.
PREPARATION:
See input signal check on page DI±870.
CHECK:
Check the indicator lights when clutch pedal is depressed.
OK:
The indicator light goes off when shifting into clutch
pedal is depressed.
OK Proceed to next circuit inspection shown on
problem symptoms table (See page DI±879).
NG
DI08W±04

AB0119
I00139
I00175
ON
D
(±) (+)
DI±908
± DIAGNOSTICSCRUISE CONTROL SYSTEM
1143 Author: Date:
3 Check voltage between terminal D of cruise control ECU and body ground.
PREPARATION:
Turn ignition switch ON.
CHECK:
Measure voltage between terminal D of cruise control ECU con-
nector and body ground when clutch pedal is depressed and
pushed in.
OK:
Shift PositionVoltage
Clutch pedal depressed10 ± 14 V
Clutch pedal pushed inBelow 1 V
OK Proceed to next circuit inspection shown on
problem symptoms table (See page DI±879).
NG
4 Check for open in harness and connector between ECU and GAUGE fuse
(See page IN±31).
NG Repair or replace harness or connector.
OK
Check and replace cruise control ECU
(See page IN±31).

I08434
Instrument Panel J/B
Ignition Switch
ECU±IG
B 9 J12
J/C
B±YC15
B±R C
C
GND
IG1
2
B±R IG1
Battery24
AM1
Instrument Panel J/B
AM1 1K1
W
B±GF9
F41
W±B
FL MAINCruise Control ECU
1J9
B±R
1K
1B1
16
C15
W±B
W±BJ8A
J7AJ/C
1J8
1J7Instrument Panel J/B
A J11
J/C FL BLOCK
ALT
± DIAGNOSTICSCRUISE CONTROL SYSTEM
DI±909
1144 Author: Date:
ECU Power Source Circuit
CIRCUIT DESCRIPTION
The ECU power source supplies power to the actuator and sensors, etc, when terminal GND and the cruise
control ECU case are grounded.
WIRING DIAGRAM
DI08X±11

I00157
Instrument panel junction block No.1:
ECU±IG
Fuse
AB0119
I00147
I00176
ON
GND
(±) (+)B
DI±910
± DIAGNOSTICSCRUISE CONTROL SYSTEM
1145 Author: Date:
INSPECTION PROCEDURE
1 Check ECU±IG fuse.
PREPARATION:
Remove the ECU±IG fuse from instrument panel junction block
No.1.
CHECK:
Check continuity of ECU±IG fuse.
OK:
Continuity
NG Check for short in all the harness and compo-
nents connected to ECU±IG fuse.
OK
2 Check voltage between terminals B and GND of cruise control ECU connector.
PREPARATION:
(a) Remove the ECU with connector still connected.
(b) Turn ignition switch ON.
CHECK:
Measure voltage between terminals B and GND of ECU con-
nector.
OK:
10 ± 14 V
OK Proceed to next circuit inspection shown on
problem symptoms table (See page DI±879).
NG

I00140
GND
± DIAGNOSTICSCRUISE CONTROL SYSTEM
DI±911
1146 Author: Date:
3 Check resistance between terminal GND of cruise control ECU connector and
body ground.
CHECK:
Measure resistance between terminal GND of ECU connector
and body ground.
OK:
Resistance: Below 1 W
NG Repair or replace harness or connector.
OK
Check and repair harness and connector be-
tween cruise control ECU and battery
(See page IN±31).

AB0119
I00145
I00177
ON
CMS
(±) (+)
DI±912
± DIAGNOSTICSCRUISE CONTROL SYSTEM
1147 Author: Date:
Main Switch Circuit (Cruise Control Switch)
CIRCUIT DESCRIPTION
When the cruise control main switch is turned OFF, the cruise control does not operate.
WIRING DIAGRAM
See page DI±892.
INSPECTION PROCEDURE
1 Check voltage between terminal CMS of cruise control ECU connector and body
ground.
PREPARATION:
(a) Remove the ECU with connector still connected.
(b) Turn ignition switch ON.
CHECK:
Measure voltage between terminal CMS of cruise control ECU
connector when main switch is held ON and OFF.
OK:
Main switchVoltage
OFF10 ± 14 V
ONBelow 0.5 V
OK Proceed to next circuit inspection shown on
problem symptoms table (See page DI±879).
NG
DI08Z±16

N15969
35
± DIAGNOSTICSCRUISE CONTROL SYSTEM
DI±913
1148 Author: Date:
2 Check main switch continuity.
PREPARATION:
(a) Remove steering wheel center pad. (See page SR±11)
(b) Disconnect the control switch connector.
CHECK:
Check continuity between terminals 3 and 5 of control switch
connector when main switch is held ON and OFF.
OK:
Switch positionTester connectionSpecified condition
OFF3 ± 5No continuity
Hold ON3 ± 5Continuity
NG Replace control switch.
OK
3 Check harness and connector between cruise control ECU and main switch
(See page IN±31).
NG Repair or replace harness or connector.
OK
Check and replace cruise control ECU
(See page IN±31).

I00290
Cruise Control ECU
4
PI
O D DJ/C
O IG25
O 10
7
R±L D DJ/C
R±L
Instrument Panel J/B
2
1D
1K1
B±Y4IG1AM1 Ignition Switch
2
W
Instrument Panel J/B
AM1 GAUGE
2
1K 1
1B
B±R 1
ALT FL BLOCK
1
B±G
FL MAIN
BatteryCRUISE MAIN
Indicator Light
(in Combination Meter)
C15
J2
C10
C10 J4
F9
F4 DI±914
± DIAGNOSTICSCRUISE CONTROL SYSTEM
1149 Author: Date:
CRUISE MAIN Indicator Light Circuit
CIRCUIT DESCRIPTION
When the cruise control main switch is turned ON, CRUISE MAIN indicator light lights up.
WIRING DIAGRAM
DI090±17

AB0119
I00144
I00178
ON
PI
(±) (+)
± DIAGNOSTICSCRUISE CONTROL SYSTEM
DI±915
1150 Author: Date:
INSPECTION PROCEDURE
1 Check voltage between terminals PI and GND of cruise control ECU connector.
PREPARATION:
Tun ignition switch ON.
CHECK:
Measure voltage between terminals PI and GND of cruise con-
trol ECU connector when main switch is ON and OFF.
OK:
Switch positionVoltage
OFF10 ± 16 V
ONBelow 1.2 V
OK Proceed to next circuit inspection shown on
problem symptoms table (See page DI±879).
NG
2 Check combination meter (See page BE±2).
NG Replace combination meter.
OK
Check and replace cruise control ECU
(See page IN±31).

I00291
Cruise Control ECU
4
PI
5
TC O
LG±R D DJ/C
J/C
B
B B O
LG±R 10
4DLC2
II3 11
C15
LG±R*1
11 DLC1
C15
J2
D4 D4
J3
D1LG±R
P±B
*2
*1: TMC Made, TMMK Made (5S±FE)
*2: TMMK Made (1MZ±FE) DI±916
± DIAGNOSTICSCRUISE CONTROL SYSTEM
1151 Author: Date:
Diagnosis Circuit
CIRCUIT DESCRIPTION
This circuit sends a signal to the ECU that outputs DTC.
WIRING DIAGRAM
DI091±11