diagram TOYOTA CAMRY 1999 Service Owner's Manual

DI±130
± DIAGNOSTICSENGINE (5S±FE)
365 Author: Date:
DTC No.DTC Detecting ConditionTrouble Area
P0441
Pressure in the charcoal canister does not drop during purge
control
(2 trip detection logic)
P0441During purge cut±off, pressure in charcoal canister is very low
compared with atmospheric pressure
(2 trip detection logic)

Open or short in VSV circuit for vapor pressure sensor

VSV for vapor pressure sensor
When VSV for vapor pressure sensor is OFF, ECM judges that
there is no continuity between vapor pressure sensor and
charcoal canister
(2 trip detection logic)
Open or short in vapor pressure sensor circuit

Vapor pressure sensor

Open or short in VSV circuit for EVAP

VSV for EVAP

Vacuum hose cracks hole blocked damaged or
P0446
When VSV for vapor pressure sensor is ON, ECM judges that
there is no continuity between vapor pressure sensor and fuel
tank
(2 trip detection logic)
Vacuum hose cracks, hole, blocked, damaged or
disconnected ((1), (4), (5) holed (6) and (7) in fig. 1)

Charcoal canister cracked, holed or damaged

Fuel tank over fill check valve cracked or damaged
After purge cut off operates, pressure in charcoal canister is
maintained at atmospheric pressure
(2 trip detection logic)
WIRING DIAGRAM
Refer to DTC P0440 (Evaporative Emission Control System Malfunction) on page DI±122.
INSPECTION PROCEDURE
TOYOTA hand±held tester:
HINT:

If DTC P0441 (Evaporative Emission Control System Incorrect Purge Flow), P0446 (Evaporative
Emission Control System Vent Control Malfunction), P0450 (Evaporative Emission Control System
Pressure Sensor Malfunction) or P0451 is output after DTC P0440 (Evaporative Emission Control Sys-
tem Malfunction), first troubleshoot DTC P0441, P0446, P0450 or P0451. If no malfunction is detected,
troubleshoot DTC P0440 next.

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 warmed up or not, the air±fuel
ratio lean or rich, etc. at the time of the malfunction.

When the ENGINE RUN TIME in the freeze frame data is less than 200 seconds, carefully check the
VSV for EVAP, charcoal canister and vapor pressure sensor.

± DIAGNOSTICSENGINE (5S±FE)
DI±143
378 Author: Date:
DTC No.DTC Detecting ConditionTrouble Area
P0450
10 seconds or more after engine starting codition (a) or (b)
continues for 7 seconds or more:
(2 trip detection logic)
(a) vapor pressure sensor value < ±4 kpa (±30 mmHg,
±1.0 in.Hg)
(b) Vapor pressure sensor value
2.1 kpa (±15 mmHg,
0.4 in.Hg)

Open or short in vapor pressure sensor circuit

Vapor pressure sensor

ECM
F l t k fill h k l k d d d
P0451
Vapor pressure sensor output extremely changes under condi-
tions of (a), (b) and (c):
(2 trip detection logic)
(a) Vehicle speed: 0 km/h (0 mph)
(b) Engine speed: idling
(c) VSV for vapor pressure sensor is ON
Fuel tank over fill check valve cracked or damaged.
WIRING DIAGRAM
Refer to DTC P0440 (Evaporative Emission Control System Malfunction) on page DI±122.
INSPECTION PROCEDURE
HINT:

If DTC P0441 (Evaporative Emission Control System Incorrect Purge Flow), P0446 (Evaporative
Emission Control System Vent Control Malfunction), P0450 (Evaporative Emission Control System
Pressure Sensor Malfunction) or P0451 is output after DTC P0440 (Evaporative Emission Control Sys-
tem Malfunction), first troubleshoot DTC P0441, P0446, P0450 or P0451. If no malfunction is detected,
troubleshoot DTC P0440 next.

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 warmed up or not, the air±fuel
ratio lean or rich, etc. at the time of the malfunction.

When the ENGINE RUN TIME in the freeze frame data is less than 200 seconds, carefully check the
VSV for EVAP, charcoal canister and vapor pressure sensor.
1 Check voltage between terminals VC and E2 of ECM connector
(See page DI±122, step 9).
NG Check and replace ECM (See page IN±31).
OK

A00414
No.1 Vehicle
Speed Sensor4±Pulse 4±Pulse
Combination Meter
ECM
Transaxle
No.1 Vehicle Speed Sensor
A03601
Combination Meter
14
V±WV±W
B J15
J/C
IG3
BV±W9
E7SPD5 V ECM
3
C9
*1: w/o Immobiliser
*2: w/ Immobiliser(*1) (*2)
E7 8
± DIAGNOSTICSENGINE (5S±FE)
DI±145
380 Author: Date:
DTC P0500 Vehicle Speed Sensor Malfunction
CIRCUIT DESCRIPTION
The No.1 vehicle speed sensor outputs a 4±pulse signal for every revolution of the rotor shaft, which is ro-
tated by the transmission output shaft via the driven gear. After this signal is converted into a more precise
rectangular waveform by the waveform shaping circuit inside the combination meter, it is then transmitted
to the ECM. The ECM determines the vehicle speed based on the frequency of these pluse signals.
DTC No.DTC Detecting ConditionTrouble Area
P0500
During vehicle is being driven, no vehicle speed sensor signal
to ECM
(2 trip detection logic)
Combination meter

Open or short in No.1 vehicle speed sensor circuit

No.1 vehicle speed sensor

ECM
WIRING DIAGRAM
DI01B±10

P01559
Throttle Valve
To Cylinder ECM Signal From
Air
Cleaner
Valve
IAC Valve
Intake Air
Chamber
A07553
B±Y 9
2B±Y B±Y
II3J19
J/CIAC ValveECM
1
3 2
B
EFI
5
1 Engine Room J/B No.2
42
2J
W±B
B
ISCO
E01
E01 ISCC10
9W
B±OE9
E9
1
2A
2K
EFI Relay
EB
From
BatteryB
*1: w/o Immobiliser
*2: w/ Immobiliser(*1) (*2)
E97
E96
(*2) (*1)
E107MREL2FB±W B±W
II4
(*2)
7
6(*2) (*2)
3
B±R
(*1)From
Ignition SW DI±148
± DIAGNOSTICSENGINE (5S±FE)
383 Author: Date:
DTC P0505 Idle Control System Malfunction
CIRCUIT DESCRIPTION
The rotary solenoid type IAC valve is located on the throttle
body and intake air bypassing the throttle valve is directed to
the IAC valve through a passage.
In this way the intake air volume bypassing the throttle valve is
regulated, controlling the engine speed.
The ECM operates only the IAC valve to perform idle±up and
provide feedback for the target idling speed.
DTC No.DTC Detecting ConditionTrouble AreaTrouble Area
P0505Idle speed continues to vary greatly from the target speed
(2 trip detection logic)

IAC valve is stuck or closed

Open or short in IAC valve circuit

Open or short in A/C switch circuit

Air intake (hose loose)

ECM
WIRING DIAGRAM
DI01C±05

DI±152
± DIAGNOSTICSENGINE (5S±FE)
387 Author: Date:
DTC P1130 A/F Sensor Circuit Range/Performance
Malfunction (Only for California Spec.)
CIRCUIT DESCRIPTION
Refer to DTC P0125 (Insufficient Coolant Temp. for Closed Loop Fuel Control (Only for California Spec.))
on page DI±61.
DTC No.DTC Detecting ConditionTrouble Area
Voltage output* of A/F sensor remains at 3.8 V or more, or 2.8
V or less, during engine running after engine is warmed up (2
trip detection logic)
*: Output value changes at the inside of ECM only
P1130Voltage output* of A/F sensor does not change from 3.30 V,
during engine running after engine is warmed up
(2 trip detection logic)
*: Output value changes at inside of ECM only
Open or short in A/F sensor circuit

A/F sensor

ECM
Open or short in A/F sensor circuit
(2 trip detection logic)
HINT:

After confirming DTC P1130, use the OBD II scan tool or TOYOTA hand-held tester to confirm voltage
output of A/F sensor (AFS B1 S1 / O2S B1 S1) from the CURRENT DATA.

The A/F sensor's output voltage and the short-term fuel trim value can be read using the OBD II scan
tool or TOYOTA hand-held tester.

The ECM controls the voltage of AF
and AF terminals of ECM to the fixed voltage. Therefore, it
is impossible to confirm the A/F sensor output voltage without OBD II scan tool or TOYOTA hand±held
tester.

OBD II scan tool (excluding TOYOTA hand-held tester) displays the one fifth of the A/F sensor output
voltage which is displayed on the TOYOTA hand-held tester.
WIRING DIAGRAM
Refer to DTC P0125 (Insufficient Coolant Temp. for Closed Loop Fuel Control (Only for California Spec.))
on page DI±61.
DI01D±06

A00430
HTAF (+) ON
± DIAGNOSTICSENGINE (5S±FE)
DI±161
396 Author: Date:
DTC P1135 A/F Sensor Heater Circuit Malfunction
(Only for California Spec.)
CIRCUIT DESCRIPTION
Refer to DTC P0125 (Insufficient Coolant Temp. for Closed Loop Fuel Control (Only for California Spec.))
on page DI±61.
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 (Insufficient Coolant Temp. for Closed Loop Fuel Control (Only for California Spec.))
on page DI±61.
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 warmed up or not, the air±fuel ratio 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 page SF±64).
(b) Turn the ignition switch ON.
CHECK:
Measure voltage between terminals HTAF of the ECM connec-
tor and body ground.
OK:
Voltage: 9 ~ 14 V
OK Check and replace ECM (See page IN±31).
NG
DI01F±05

A07122
IG Switch
B±R
BatteryEngine Room
J/B No.2
76B±R13
1II3B±R
B
BR
Spark Plug
Spark Plug
2
3 2
3 4
Tr2 Igniter
No.1
Ignition
Coil
No.1
FL Block
Y±R
BR
B
20
19
IGT2
Tr1
E9
E9
E9
W±R
IGT1
IGF5 V
Tr1
Ignition Coil
No.2
Igniter
No.2
AA A
EC
Tr2
W±R
B±R 5 51B 1K
Instrument
W±R
W±R
2L 2A
4 1
AM2B
F4 F6 1
1
B±G
MAIN FL
3 1
4
J/C J25
*1: w/o Immobiliser
*2: w/ Immobiliser(*1) (*2)
ECM
E9 23
E9 22
E9 17
(*1) (*2)
W±R
Panel J/BB
B
BR
BR J19
J/C
DI±164
± DIAGNOSTICSENGINE (5S±FE)
399 Author: Date:
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:

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

If DTC P1300 is displayed, check ignition coil No.2 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 warmed up or not, the air±fuel
ratio lean or rich, etc. at the time of the malfunction.
1 Check for spark plug and spark of misifining cylinder (See page DI±89).
NG Go to step 4.
OK
2 Check for open and short in harness and connector in IGF signal circuit between
ECM and ignition coils (See page IN±31).
NG Repair or replace harness or connector.
OK

± DIAGNOSTICSENGINE (5S±FE)
DI±169
404 Author: Date:
DTC P1335 Crankshaft Position Sensor Circuit
Malfunction (During engine running)
CIRCUIT DESCRIPTION
Refer to DTC P0335 (Crankshaft Position ºAº Circuit Malfunction) on page DI±100.
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 m sec.
(c) Not during cranking
Open or short in crankshaft position sensor circuit

Crankshaft position sensor

ECM
WIRING DIAGRAM
Refer to DTC P0335 (Crankshaft Position ºAº Circuit Malfunction) on page DI±100.
INSPECTION PROCEDURE
Refer to DTC P0335 (Crankshaft Position ºAº Circuit Malfunction) on page DI±100.
DI1K1±02

A03604
ECM
STP 4
E7
G±W G±WJ27 J28 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
BP High
Mount
Stop
Light
2
1R
A
A
J40
J/C
BL
1
W±B
Stop Light
Switch
2
BatteryW±B W
1C 7
STOP
41BInstrument
Panel J/B
B±R
B±R
F9 2 F9 1
ALT
F4MAIN
FL
FL Block
G±W
1
*1: w/o Immobiliser
*2: w/ Immobiliser(*1) (*2)
E79 DI±170
± DIAGNOSTICSENGINE (5S±FE)
405 Author: Date:
DTC P1520 Stop Light Switch Signal Malfunction (Only
for A/T)
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
DI01H±07

A03605
Engine Room J/B No.2
EFI11
B
Battery B±G11
2A E7ECM
F4BATT
2JB±Y
F68
FL Block
MAIN FL
*1: w/o Immobiliser
*2: w/ Immobiliser(*1)
(*2)
E72
± DIAGNOSTICSENGINE (5S±FE)
DI±173
408 Author: Date:
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 warmed up or not, the air±fuel ratio lean or rich, etc.
at the time of the malfunction.
DI01I±10