Brand:

Toyota

Model Name:

Yaris NCP90 91 92 93

Manual:

Repair Manual

Section:

1Nz-Fe Engine Control System

Title:

Sfi System

  1. Waveform 1

  2. Waveform 2

  3. Waveform 3

  4. Waveform 4

  5. Waveform 5

  6. Waveform 6

  7. Waveform 7

  8. Waveform 8

  9. Waveform 9

  10. Waveform 10

  11. Waveform 11

  12. Waveform 12

  13. Waveform 13


​


The wavelength becomes shorter as engine rpm increases. Yaris

HINT:
The standard normal voltage between each pair of ECM terminals is shown in the table below. The appropriate conditions for checking each pair of terminals are also indicated. The result of checks should be compared with the standard normal voltage for that pair of terminals, displayed in the Specified Condition column. The illustration above can be used as a reference to identify the ECM terminal locations.

Symbols (Terminal No.)
Wiring Colors
Terminal Descriptions
Conditions
Specified Conditions
BATT (A21-20) - E1 (C20-104)
Y - W
Battery (for measuring battery voltage and for ECM memory)
Always
9 to 14 V
+B (A21-2) - E1 (C20-104)
B - W
Power source of ECM
Ignition switch to ON
9 to 14 V
+B2 (A21-1) - E1 (C20-104)
B - W
Power source of ECM
Ignition switch to ON
9 to 14 V
+BM (A21-3) - ME01 (C20-43)
GR - BR
Power source of throttle actuator
Always
9 to 14 V
IGT1 (C20-85) - E1 (C20-104)
W - W
Ignition coil with igniter (ignition signal)
Idling
Pulse generation
(see waveform 1)
IGT2 (C20-84) - E1 (C20-104)
BE - W
IGT3 (C20-83) - E1 (C20-104)
G - W
IGT4 (C20-82) - E1 (C20-104)
LG - W
IGF1 (C20-81) - E1 (C20-104)
Y - W
Ignition coil with igniter (ignition confirmation signal)
Ignition switch to ON
4.5 to 5.5 V
Idling
Pulse generation
(see waveform 1)
NE+ (C20-122) - NE- (C20-121)
L - P
Crankshaft position sensor
Idling
Pulse generation
(see waveform 2)
G2+ (C20-99) - NE- (C20-121)
B - P
Camshaft position sensor
Idling
Pulse generation
(see waveform 2)
#10 (C20-108) - E01 (C20-45)
SB - BR
Injector
Ignition switch to ON
9 to 14 V
#20 (C20-107) - E01 (C20-45)
GR - BR
#30 (C20-106) - E01 (C20-45)
P - BR
#40 (C20-105) - E01 (C20-45)
L - BR
HT1A (C20-109) - E03 (C20-86)
G - W
Heated oxygen sensor heater (sensor 1)
Ignition switch to ON
9 to 14 V
OX1A (C20-112) - EX1A (C20-90)
W - L
Heated oxygen sensor (sensor 1)
Maintain engine speed at 2,500 rpm for 2 minutes after warming up sensor
Pulse generation
(see waveform 3)
HT1B (C20-47) - E03 (C20-86)
LG - W
Heated oxygen sensor heater (sensor 2)
Ignition switch to ON
9 to 14 V
OX1B (C20-64) - EX1B (C20-87)
G - GR
Heated oxygen sensor (sensor 2)
Engine speed maintained at 2,500 rpm for 2 minutes after warming up sensor
Pulse generation
(see waveform 4)
KNK1 (C20-110) - EKNK (C20-111)
R - G
Knock sensor
Engine speed maintained at 4,000 rpm after warming up engine
Pulse generation
(see waveform 5)
SPD (A21-8) - E1 (C20-104)
V - W
Speed signal from combination meter
Driving at 20 km/h (12 mph)
Pulse generation
(see waveform 6)
THW (C20-97) - ETHW (C20-96)
L - P
Engine coolant temperature sensor
Idling, Engine coolant temperature 80°C (176°F)
0.2 to 1.0 V
ACCR (A21-13) - E01 (C20-45)
G - BR
ACC (Accessory) relay control signal
Cranking
Below 1.5 V
THA (C20-65) - ETHA (C20-88)
P - BE
Intake air temperature sensor
Idling, Intake air temperature 20°C (68°F)
1.5 to 3.0 V
VG (C20-118) - E2G (C20-116)
GR - LG
Mass air flow meter
Idling, Shift lever position P or N, A/C switch OFF
0.5 to 3.0 V
W (A21-24) - E1 (C20-104)
B - W
MIL
Ignition switch to ON
Below 1.5 V
Idling
9 to 14 V
STA (A21-48) - E1 (C20-104)
BR - W
Starter signal
Cranking
5.5 V or more
VTA1 (C20-115) - ETA (C20-91)
Y - V
Throttle position sensor (for engine control)
Ignition switch to ON, Throttle valve fully closed
0.5 to 1.2 V
Ignition switch to ON, Throttle valve fully open
3.2 to 4.8 V
VTA2 (C20-114) - ETA (C20-91)
GR - V
Throttle position sensor (for sensor malfunction detection)
Ignition switch to ON, Throttle valve fully closed
2.1 to 3.1 V
Ignition switch to ON, Throttle valve fully open
4.5 to 5.5 V
VCTA (C20-67) - ETA (C20-91)
W - V
Power source of sensor (specific voltage)
Ignition switch to ON
4.5 to 5.5 V
VCPA (A21-57) - EPA (A21-59)
B - G
Power source of accelerator pedal position sensor (for VPA)
Ignition switch to ON
4.5 to 5.5 V
VPA (A21-55) - EPA (A21-59)
R - G
Accelerator pedal position sensor (for engine control)
Ignition switch to ON, Accelerator pedal released
0.5 to 1.1 V
Ignition switch to ON, Accelerator pedal fully depressed
2.6 to 4.5 V
VPA2 (A21-56) - EPA2 (A21-60)
L - BR
Accelerator pedal position sensor (for sensor malfunctioning detection)
Ignition switch to ON, Accelerator pedal released
1.2 to 2.0 V
Ignition switch to ON, Accelerator pedal fully depressed
3.4 to 5.0 V
VCP2 (A21-58) - EPA2 (A21-60)
W - BR
Power source of accelerator pedal position sensor (for VPA2)
Ignition switch to ON
4.5 to 5.0 V
M+ (C20-42) - ME01 (C20-43)
G - BR
Throttle actuator
Idling with warm engine
Pulse generation
(see waveform 7)
M- (C20-41) - ME01 (C20-43)
R - BR
Throttle actuator
Idling with warm engine
Pulse generation
(see waveform 8)
STP (A21-36) - E1 (C20-104)
G - W
Stop light switch
Brake pedal depressed
9 to 14 V
Brake pedal released
Below 1.5 V
ST1- (A21-35) - E1 (C20-104)
Y - W
Stop light switch (opposite to STP terminal)
Ignition switch to ON, Brake pedal depressed
Below 1.5 V
Ignition switch to ON, Brake pedal released
9 to 14 V
PRG (C20-49) - E01 (C20-45)
L - BR
VSV for EVAP
Ignition switch to ON
9 to 14 V
Idling
Pulse generation
(see waveform 9)
FC (A21-7) - E01 (C20-45)
V - BR
Fuel pump control
Ignition switch to ON
9 to 14 V
Idling
Below 1.5 V
TACH (A21-15) - E1 (C20-104)
LG - W
Engine speed
Idling
Pulse generation
(see waveform 10)
TC (A21-27) - E1 (C20-104)
P - W
Terminal TC of DLC 3
Ignition switch to ON
9 to 14 V
OC1+ (C20-100) - OC1- (C20-123)
BR - R
Camshaft timing oil control valve (OCV)
Idling
Pulse generation
(see waveform 11)
CANH (A21-41) - E1 (C20-104)
L - W
CAN communication line
Ignition switch to ON
Pulse generation
(see waveform 12)
CANL (A21-49) - E1 (C20-104)
W - W
CAN communication line
Ignition switch to ON
Pulse generation
(see waveform 13)
ELS (A21-31) - E1 (C20-104)
G - W
Electric load
Tail light switch on
7.5 to 14 V
Tail light switch off
Below 1.5 V
ELS3 (A21-33) - E1 (C20-104)
V - W
Electric load
Defogger switch on
7.5 to 14 V
Defogger switch off
Below 1.5 V
FAN (A21-21) - E1 (C20-104)
BE - W
Fan No. 1 relay
Ignition switch to ON
9 to 14 V
Idling with A/C ON
or
High engine coolant temperature
Below 1.5 V
FAN2 (A21-22) - E1 (C20-104)
LG - W
Fan No. 2 relay
Idling with high engine coolant temperature
Below 1.5 V
ALT (C20-50) - E1 (C20-104)
P - W
Generator
Ignition switch to ON
9 to 14 V
IGSW (A21-28) - E1 (C20-104)
R - W
Ignition switch
Ignition switch to ON
9 to 14 V
MREL (A21-44) - E1 (C20-104)
GR - W
EFI relay
Ignition switch to ON
9 to 14 V
STSW (A21-14) - E1 (C20-104)
B - W
Ignition switch signal
Shift lever position P or N, ignition switch START
6.0 V or more
STAR (C20-52) - E1 (C20-104)
BE - W
Starter relay control
Ignition switch to ON
Below 1.5 V
Cranking
6.0 V or more
*: The ECM terminal voltage is constant regardless of the output voltage from the sensor.

WAVEFORM 1
The wavelength becomes shorter as engine rpm increases. Yaris
Igniter IGT signal (from ECM to igniter) and Igniter IGF signal (from igniter to ECM):
ECM Terminal Names
Between IGT (1 to 4) and E1
Between IGF1 and E1
Tester Ranges
5 V/DIV., 10 msec./DIV.
Conditions
Idling
HINT:
The wavelength becomes shorter as the engine rpm increases.

WAVEFORM 2
The wavelength becomes shorter as engine rpm increases. Yaris
Crankshaft position sensor and Camshaft position sensor:
ECM Terminal Names
Between G2+ and NE-
Between NE+ and NE-
Tester Ranges
5 V/DIV., 20 msec./DIV.
Conditions
Idling
HINT:
The wavelength becomes shorter as the engine rpm increases.

WAVEFORM 3
The wavelength becomes shorter as engine rpm increases. Yaris
Heated oxygen sensor (bank 1 sensor 1):
ECM Terminal Names
Between OX1A and EX1A
Tester Ranges
0.2 V/DIV., 200 msec./DIV.
Conditions
Maintain engine speed at 2,500 rpm for 2 minutes after warming up sensor
HINT:
In the Data List, the items HO2S B1 S1 show the ECM input values of the HO2S (sensor 1).

WAVEFORM 4
The wavelength becomes shorter as engine rpm increases. Yaris
Heated oxygen sensor (bank 1 sensor 2):
ECM Terminal Names
Between OX1B and EX1B
Tester Ranges
0.2 V/DIV., 200 msec./DIV.
Conditions
Maintain engine speed at 2,500 rpm for 2 minutes after warming up sensor
HINT:
In the Data List, the items HO2S B1 S2 show the ECM input values of the HO2S (sensor 2).

WAVEFORM 5
The wavelength becomes shorter as engine rpm increases. Yaris
Knock sensor:
ECM Terminal Names
Between KNK1 and EKNK
Tester Ranges
1 V/DIV., 1 msec./DIV.
Conditions
Maintain engine RPM at 4,000 rpm after engine warmed-up
HINT:
  1. The wavelength becomes shorter as engine rpm increases.
  2. The waveforms and amplitudes displayed differ slightly depending on the vehicle.

WAVEFORM 6
Sfi System - Problem Symptoms Table(2011/05 - ) Yaris
Vehicle speed signal:
ECM Terminal Names
Between SPD and E1
Tester Ranges
5 V/DIV., 20 msec./DIV.
Conditions
Driving at 20 km/h (12 mph)
HINT:
The wavelength becomes shorter as the vehicle speed increases.

WAVEFORM 7
Sfi System - Problem Symptoms Table(2011/05 - ) Yaris
Throttle actuator positive terminal:
ECM Terminal Names
Between M+ and ME01
Tester Ranges
5 V/DIV., 1 msec./DIV.
Conditions
Idling with warm engine
HINT:
The duty ratio varies depending on the throttle actuator operation.

WAVEFORM 8
Sfi System - Problem Symptoms Table(2011/05 - ) Yaris
Throttle actuator negative terminal:
ECM Terminal Names
Between M- and ME01
Tester Ranges
5 V/DIV., 1 msec./DIV.
Conditions
Idling with warm engine
HINT:
The duty ratio varies depending on the throttle actuator operation.

WAVEFORM 9
Sfi System - Problem Symptoms Table(2011/05 - ) Yaris
VSV for EVAP:
ECM Terminal Names
Between PRG and E01
Tester Ranges
5 V/DIV., 50 msec./DIV.
Conditions
Idling
HINT:
If the waveform is not similar to the illustration, check the waveform again after idling for 10 minutes or more.

WAVEFORM 10
Sfi System - Problem Symptoms Table(2011/05 - ) Yaris
Engine speed signal:
ECM Terminal Names
Between TACH and E1
Tester Ranges
5 V/DIV., 10 msec./DIV.
Conditions
Idling
HINT:
The wavelength becomes shorter as the engine rpm increases.

WAVEFORM 11
Sfi System - Problem Symptoms Table(2011/05 - ) Yaris
Camshaft timing oil control valve (OCV):
ECM Terminal Names
Between OC1+ and OC1-
Tester Ranges
5 V/DIV., 1 msec./DIV.
Conditions
Idling

WAVEFORM 12
Sfi System - Problem Symptoms Table(2011/05 - ) Yaris
CAN communication signal:
ECM Terminal Names
Between CANH and E1
Tester Ranges
1 V/DIV., 10 μsec./DIV.
Conditions
Engine stop and ignition switch to ON
HINT:
The waveform varies depending on the CAN communication signal.

WAVEFORM 13
Sfi System - Problem Symptoms Table(2011/05 - ) Yaris
CAN communication signal:
ECM Terminal Names
Between CANL and E1
Tester Ranges
1 V/DIV., 10 μsec./DIV.
Conditions
Engine stop and ignition switch to ON
HINT:
The waveform varies depending on the CAN communication signal.