1999 TOYOTA CAMRY efi

A03020A03424
ON
OFF
ONTPC
E
G
FFE
G
VSV is ON
VSV is OFF OFFONTPC
w/o Immobiliser
w/ Immobiliser
DI±140
± DIAGNOSTICSENGINE (5S±FE)
375 Author: Date:
8 Check for open and short in harness and connector between EFI main relay
(Marking: EFI) and VSV for EVAP, and VSV for EVAP and ECM (See page IN±31)
NG Repair or replace harness or connector.
OK
Check and replace ECM (See page IN±31).
9 Check VSV for vapor pressure sensor.
PREPARATION:
(a) Remove the glove compartment (See page SF±64).
(b) Turn the ignition switch ON.
CHECK:
(a) Connect between terminal TPC of the ECM connector
and body ground (ON).
(b) Disconnect between terminal TPC of the ECM connector
and body ground (OFF).
OK:
(1) VSV is ON:
Air from port E is flowing out through port F.
(2) VSV is OFF:
Air from port E is flowing out through port G.
OK Check and replace charcoal canister
(See page EC±6).
NG

± DIAGNOSTICSENGINE (5S±FE)
DI±141
376 Author: Date:
10 Check operation of VSV for vapor pressure sensor (See page SF±47).
NG Go to step 11.
OK
Replace VSV and clean vacuum hoses between charcoal canister and VSV for vapor pressure
sensor, and VSV for vapor pressure sensor and vapor pressure sensor, and then check the char-
coal canister.
11 Check for open and short in harness and connector between EFI main relay
(Marking: EFI) and VSV for vapor pressure sensor, and VSV for vapor pressure
sensor and ECM (See page IN±31).
NG Repair or replace harness or connector.
OK
Check and replace ECM (See page IN±31).
12 Check fuel tank over fill check valve (See page EC±6).
NG Replace fuel tank over fill check valve or fuel
tank.
OK
Check and replace charcoal canister
(See page EC±6).

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±162
± DIAGNOSTICSENGINE (5S±FE)
397 Author: Date:
2 Check resistance of A/F sensor heater (See page SF±59).
NG Replace A/F sensor.
OK
Check and repair harness or connector between EFI main relay (Marking: EFI) and A/F sensor,
and A/F sensor and ECM (See page IN±31).

DI±168
± DIAGNOSTICSENGINE (5S±FE)
403 Author: Date:
8 Check for open and short in harness and connector between ignition switch and
ignition coils (See page IN±31).
NG Repair or replace harness or connector.
OK
9 Check ignition coil (See page IG±5).
NG Replace ignition coil.
OK
10 Check EFI main relay (Marking: EFI) (See page SF±40).
NG Replace EFI main relay.
OK
Replace igniter.

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

A03026A03448
LOCK
BATT (+) w/o Immobiliser
w/ Immobiliser
BATT (+)
A00356
Engine Room J/B No.2
EFI Fuse
DI±174
± DIAGNOSTICSENGINE (5S±FE)
409 Author: Date:
1 Check voltage between terminal BATT of ECM connector and body ground.
PREPARATION:
Remove the glove compartment (See page SF±64).
CHECK:
Measure voltage between terminal BATT of the ECM connector
and body ground.
OK:
Voltage 9 ~ 14 V
OK Check and replace ECM (See page IN±31).
NG
2 Check EFI fuse.
PREPARATION:
Remove the EFI fuse from the engine room J/B No.2.
CHECK:
Check continuity of the EFI fuse.
OK:
Continuity
NG Check for short in all harness and components
connected to EFI fuse.
OK
Check and repair harness or connector
between battery and EFI fuse, and EFI fuse
and ECM (See page IN±31).

A07554
ECM
+B 12
E7 B±Y J/C
B
J28 J27B
B±Y
Instrument
Panel J/B 22J 2K7
W±R EFI
Relay 1 3
52
2F4
W±B
2A 1
AM2
42L
B
FL
Block
MAIN
FL
B±GEngine
J/B No.2
5
1B
531K71W
IGN
1K
Room
W±R
IG
Switch
7 6
14
E9
BR
B±R
EC
E1
F6
F4EB
B±R
1
1
EFI
J23
J/C A
A
Battery
BR
(*2) (*1)
*1: w/ Immobiliser
*2: w/o ImmobiliserE924 (*2)
MREL 7
E10 B±Y (*1) 6II4 B±W (*1)
± DIAGNOSTICSENGINE (5S±FE)
DI±179
414 Author: Date:
ECM Power Source Circuit
CIRCUIT DESCRIPTION
When the ignition switch is turned ON, battery positive voltage is applied to the coil, closing the contacts of
the EFI main relay (Marking: EFI) and supplying power to terminal +B of the ECM.
WIRING DIAGRAM
DI01L±05