Toyota 2007 CAMRY Manual page 137

Engine Control for 2AZ–FE
2. Control System
∗ SFI system
The SFI system monitors the engine condition through the signals input from each sensor to the engine control module.
And the control signal is output to TERMINALS #10, #20, #30, #40 of the engine control module to operate the fuel
injector (Inject the fuel). The SFI system controls the fuel injection operation by the engine control module in response to
the driving conditions.
∗ ESA system
The ESA system monitors the engine condition through the signals input to the engine control module from each sensor.
The best ignition timing is decided according to this data and the memorized data in the engine control module and the
control signal is output to TERMINALS IGT1, IGT2, IGT3, IGT4. This signal controls the igniter to provide the best
ignition timing for the driving conditions.
∗ Heated oxygen sensor heater control system
The heated oxygen sensor heater control system turns the heater on when the intake air volume is low (Temp. of
exhaust emissions is low), and warms up the heated oxygen sensor to improve detection performance of the sensor.
The engine control module evaluates the signals from each sensor, and outputs current to TERMINAL HT1B to control
the heater.
3. Diagnosis System
With the diagnosis system, when there is a malfunction in the engine control module signal system, the malfunctioning
system is recorded in the memory. The malfunctioning system can be found by reading the code displayed by the
malfunction indicator lamp.
4. Fail–Safe System
When a malfunction has occurred in any system, if there is a possibility of engine trouble being caused by continued control
based on the signals from that system, the fail–safe system either controls the system by using data (Standard values)
recorded in the engine control module memory or else stops the engine.
: Parts Location
Code See Page
A17 59
A19 59
A22 59
A24 A 52 (2AZ–FE)
A25 C 52 (2AZ–FE)
A26 A 52 (2AZ–FE)
A40 A 59
A41 A 59
A42 B 59
A58 A 59
A60 B 53 (2AZ–FE)
C1 B 54 (2AZ–FE)
C2 54 (2AZ–FE)
C4 54 (2AZ–FE)
C5 54 (2AZ–FE)
C6 54 (2AZ–FE)
: Relay Blocks
Code See Page
1 22
136
Code
C7
C8
C9
C10
C11
C12
C13
C14
C15
C17
C18 B
C20
C22
C24 B
C30
C31
Relay Blocks (Relay Block Location)
Engine Room R/B (Engine Compartment Left)
CAMRY (EM0250U)
See Page
54 (2AZ–FE)
54 (2AZ–FE)
54 (2AZ–FE)
54 (2AZ–FE)
54 (2AZ–FE)
54 (2AZ–FE)
54 (2AZ–FE)
54 (2AZ–FE)
54 (2AZ–FE)
54 (2AZ–FE)
54 (2AZ–FE)
55 (2AZ–FE)
55 (2AZ–FE)
55 (2AZ–FE)
55 (2AZ–FE)
55 (2AZ–FE)
Code See Page
C32 55 (2AZ–FE)
C33 55 (2AZ–FE)
E10 56
E15 56
E23 56
E40 B 57
E41 B 57
E42 A 57
E43 B 57
E62 G 57
F1 A 58
F2 B 58
N10 60
N17 60