1999 TOYOTA CAMRY diagram

A09280BE6653
A09427
HTAF ON
(±)
(+)
DI±84
± DIAGNOSTICSENGINE
DTC P1135 A/F Sensor Heater Circuit Malfunction
(Bank 1 Sensor 1)
CIRCUIT DESCRIPTION
Refer to DTC P0125 on page DI±40.
DTC No.DTC Detecting ConditionTrouble Area
P1135
When heater operates, heater current exceeds 8 A
(2 trip detection logic)
Open or short in heater circuit of A/F sensor
A/F h tP1135Heater current of 0.25 A or less when heater operates
(2 trip detection logic)
A/F sensor heater

ECM
WIRING DIAGRAM
Refer to DTC P0125 on page DI±40.
INSPECTION PROCEDURE
HINT:
Read freeze frame data using TOYOTA hand±held tester or OBD II scan tool. Because freeze frame records
the engine conditions when the malfunction is detected. When troubleshooting it is useful for determining
whether the vehicle was running or stopped, the engine was warmed up or not, the air±fuel ratio was lean
or rich, etc. at the time of the malfunction.
1 Check voltage between terminal HTAF of ECM connector and body ground.
PREPARATION:
(a) Remove the glove compartment (See Pub. No. RM654U,
page SF±64).
(b) Turn the ignition switch ON.
CHECK:
Measure the voltage between terminal HTAF of the ECM con-
nector and body ground.
OK:
Voltage: 9 ± 14 V
OK Check and replace ECM (See page IN±29).
NG
2 Check resistance of A/F sensor heater (See Pub. No. RM654U, page SF±59).
NG Replace A/F sensor.
OK
DI01F±07

A09426
Battery
EFI
AM2
1 2 3
3 1J
B2A
2J Instrument Panel J/B
1B 1W
37
15
IG Switch
1
B±RST Relay EFI Relay
5
6 3
11 410
4
5 4
5
A 2B STARTER
II23
B±W
II2
11
Starter
Park/Neutral
Position Switch
5 7
B±R Engine Room J/B No.2
2C
2F IGN
FL Block1
2D1
MAIN
W±B
10B
C
1
CIR
OPN
Relay
IGG±R
14
2L
E4FCECM
E01 1
S1S2
Engine Room R/B
No.1
2
J40
J/C
G±R
L±B
5 93
L±B
R
EB B±R
GR
W±R
B±W
BL
J/CB±R
J8
2K
J7
B
1 1 1
B 1K
1K
1K
8 76
EB1
4
J11
J/CF6 1
W±R
MAIN
FL2K
2
B±RB
B F41
GR
A
EB1
55
W±BW±B
GR
Fuel ShutOff Valve For
Pressure Regulator
Fuel ShutOff Valve
For Fuel TankFuel ShutOff Valve
For Delivery Pipe
ID1
7 J29
J/C
B
B±W
VCNG2VCNG3 4
E7
9
E7
13
E6 2
2J21
II39
II4
6 J19
J/C
B
B±G
21
21
L±B L±B
EC
L±B L±B
Y±G
W±B B±Y B±Y
BB±Y
P
± DIAGNOSTICSENGINE
DI±87
WIRING DIAGRAM

± DIAGNOSTICSENGINE
DI±95
DTC P1240 Fuel Fuel Shutoff Valve Circuit for Delivery
Pipe Malfunction
CIRCUIT DESCRIPTION
Refer to DTC P1190 on page DI±86.
DTC No.DTC Detecting ConditionTrouble Area
P1240Open in fuel shutoff valve circuit for fuel delivery pipe

Open or short in fuel shutoff valve circuit for fuel delivery pipe

Fuel shutoff valve for fuel delivery pipe

ECM
WIRING DIAGRAM
Refer to DTC P1190 on page DI±86.
INSPECTION PROCEDURE
TOYOTA hand±held tester:
1 Check fuel shutoff valve for delivery pipe.
PREPARATION:
(a) Connect the TOYOTA hand±held tester to the DLC3.
(b) Turn the ignition switch ON and push the TOYOTA hand±held tester main switch ON.
(c) Select the ACTIVE TEST mode on the TOYOTA hand±held tester.
CHECK:
Check the operating sound of the fuel shutoff valve for delivery pipe when it is operated by the TOYOTA
hand±held tester.
HINT:
Use a sound scope or your finger to check the operating sound.
OK:
There is operating sound from the shutoff valve.
OK Go to step 5.
NG
2 Check for ECM power source circuit (See page DI±116).
NG Repair or replace.
DI64Y±01

DI±98
± DIAGNOSTICSENGINE
DTC P1245 Fuel Fuel Shutoff Valve Circuit for Pressure
Regulator Malfunction
CIRCUIT DESCRIPTION
Refer to DTC P1190 on page DI±86.
DTC No.DTC Detecting ConditionTrouble Area
P1245Open in fuel shutoff valve circuit for fuel pressure regulator

Open or short in fuel shutoff valve circuit for fuel pressure
regulator

Fuel shutoff valve for fuel pressure regulator

ECM
WIRING DIAGRAM
Refer to DTC P1190 on page DI±86.
INSPECTION PROCEDURE
TOYOTA hand±held tester:
1 Check fuel shutoff valve circuit for fuel pressure regulator.
PREPARATION:
(a) Connect the TOYOTA hand±held tester to the DLC3.
(b) Turn the ignition switch ON and push the TOYOTA hand±held tester main switch ON.
(c) Select the ACTIVE TEST mode on the TOYOTA hand±held tester.
CHECK:
Check the operating sound of the fuel shutoff valve for the pressure regulator when it is operated by the TOY-
OTA hand±held tester.
HINT:
Use a sound scope or your finger to check the operating sound.
OK:
There is operating sound from the shutoff valve.
OK Go to step 4.
NG
2 Check for ECM power source circuit (See page DI±116).
NG Repair or replace.
OK
DI64Z±01

A09399
IG Switch
B±R
BatteryEngine Room
J/B No.2
763
1IG3
B
BR
Spark Plug
Spark Plug
2
3 2
3 4
Tr2 Igniter
No.1
No.1 Ignition
Coil with Igniter
FL Block
Y±R
BR
C
20
19
IGT2
Tr1
E6
E6
E6
W±R
IGT1
IGF5 V
Tr1
No.2 Ignition Coil
with Igniter
Igniter
No.2
AA A
EC
Tr2
W±R
B±R 5
1B 1K
Instrument
W±RW±R
2L 2A
4 1
AM2B
F9 F11 1
1
B±G
MAIN FL
3 1
4
J/C J9
ECM
W±R
Panel J/BC
CBR
BR J18
J/C
558
1C
1K
B±R
B±R12
± DIAGNOSTICSENGINE
DI±103
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:

If DTC P1300 is displayed, check No.1 ignition coil circuit.

If DTC P1300 is displayed, check No.2 ignition coil circuit.

Read freeze frame data using TOYOTA hand±held tester or OBD II scan tool. Because freeze frame
records the engine conditions when the malfunction is detected. When troubleshooting it is useful for
determining whether the vehicle was running or stopped, the engine was warmed up or not, the air±fuel
ratio was lean or rich, etc. at the time of the malfunction.
1 Check for spark plug and spark of misfiling cylinder (See page IG±1).
NG Go to step 4.
OK
2 Check for open and short in harness and connector in IGF signal circuit between
ECM and ignition coil with igniter (See page IN±29).
NG Repair or replace harness or connector.
OK

± DIAGNOSTICSENGINE
DI±107
DTC P1335 Crankshaft Position Sensor Circuit Malfunc-
tion (During engine running)
CIRCUIT DESCRIPTION
Refer to DTC P0335 on page DI±59.
DTC No.DTC Detecting ConditionTrouble Area
P1335
If conditions (a) through (c) are met:
(a) NE
1,000 rpm
(b) NE signal is not detected for over 50 msec.
(c) Not during cranking
Open or short in crankshaft position sensor circuit

Crankshaft position sensor

Crankshaft timing pulley

ECM
WIRING DIAGRAM
Refer to DTC P0335 on page DI±59.
INSPECTION PROCEDURE
Refer to DTC P0335 on page DI±59.
DI1K1±03

A09400
ECM
STP 4
E4
G±W G±WJ23 J24 1R 1R
1SJ27 J/C
AC Instrument Panel J/B
5
2 4
7
12
G±WLight
Failure
Sensor
Stop
Light
(LH) Stop
Light
(RH) G±R
2
52
5
W±B
W±B
BM High
Mount
Stop
Light
2
1R
A
A
J34
J/C
BL
1
W±B
Stop Light
Switch
2
BatteryW±B W
1C 7
STOP
41BInstrument
Panel J/B
B±R
B±R
F14
2 F14
1
ALT
F9MAIN
FL
FL Block
G±W
1
B±G
DI±108
± DIAGNOSTICSENGINE
DTC P1520 Stop Light Switch Signal Malfunction
CIRCUIT DESCRIPTION
This signal is used to detect when the brakes have been applied. The STP signal voltage is the same as
the voltage supplied to the stop lights. The STP signal is used mainly to control the fuel cut±off engine speed.
(The fuel cut±off engine speed is reduced slightly when the vehicle is braking.)
DTC No.DTC Detecting ConditionTrouble Area
P1520Stop light switch does not turn off even once vehicle is driven
(2 trip detection logic)
Short in stop light switch signal circuit

Stop light switch

ECM
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
Read freeze frame data using TOYOTA hand±held tester or OBD II scan tool. Because freeze frame records
the engine conditions when the malfunction is detected. When troubleshooting it is useful for determining
whether the vehicle was running or stopped, the engine was warmed up or not, the air±fuel ratio was lean
or rich, etc. at the time of the malfunction.
1 Check operation of stop light.
PREPARATION:
Check if the stop lights go on and off normally when the brake pedal is operated and released.
NG Check and repair stop light circuit
(See Pub. No. RM654U, page BE±37).
DI01H±09

A09401
Engine Room J/B No.2
EFI11
B
Battery B±G11
2A E4ECM
F9BATT
2JB±Y
F118
FL Block
MAIN FL DI±110
± DIAGNOSTICSENGINE
DTC P1600 ECM BATT Malfunction
CIRCUIT DESCRIPTION
Battery positive voltage is supplied to terminal BATT of the ECM even when the ignition switch is OFF for
use by the DTC memory and air±fuel ratio adaptive control value memory, etc.
DTC No.DTC Detecting ConditionTrouble Area
P1600Open in back up power source circuit
Open in back up power source circuit

ECM
HINT:
If DTC P1600 appear, the ECM does not store another DTC.
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
Read freeze frame data using TOYOTA hand±held tester or OBD II scan tool. Because freeze frame records
the engine conditions when the malfunction is detected. When troubleshooting it is useful for determining
whether the vehicle was running or stopped, the engine was warmed up or not, the air±fuel ratio was lean
or rich, etc. at the time of the malfunction.
DI01I±12