Toyota Tundra (2015 year). Manual — part 1858
SYMPTOM
SUSPECTED AREA
SEE
PAGE
Brake override system
Surging (Poor driveability)
Spark plug
Fuel pump control circuit
Ignition system
Injector
Mass air flow meter
Variable valve timing system
Compression
Engine stalls soon after starting
Fuel pump control circuit
Spark plug
Ignition system
Injector
Variable valve timing system
Electronic throttle control system
Air induction system
PCV hose
Compression
Engine stalls only during A/C
operation
A/C signal circuit (for Automatic Air Conditioning System)
A/C signal circuit (for Manual Air Conditioning System)
ECM
Unable/difficult to refuel
Fuel system (canister, refueling valve, roll over valve, fuel
tank, etc.)
-
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: PROBLEM ...
Last Modified: 9-16-2014
6.6 U
Doc ID: RM000000PDH0QLX
Model Year: 2015
Model: Tundra
Prod Date Range: [08/2014 - ]
Title: 3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: TERMINALS OF ECM; 2015 MY Tundra [08/2014 -
]
TERMINALS OF ECM
1. CHECK ECM
(a) Measure the voltage according to the value(s) in the table below.
HINT:
TERMINAL NO.
(SYMBOLS)
WIRING
COLOR
TERMINAL DESCRIPTION
CONDITION
SPECIFIED
CONDITION
A24-1 (BATT) -
D74-81 (E1)
L - BR
Battery (for measuring
battery voltage and for ECM
memory)
Always
11 to 14 V
D74-41 (+BM) -
D74-81 (E1)
P - BR
Always
11 to 14 V
A24-28 (IGSW) -
D74-81 (E1)
LG - BR
Ignition switch
Ignition switch ON
11 to 14 V
A24-3 (+B) -
D74-81 (E1)
GR - BR
11 to 14 V
A24-2 (+B2) -
D74-81 (E1)
GR - BR
11 to 14 V
D74-58 (OC1+) -
D74-57 (OC1-)
B - B-L
Camshaft timing oil control
valve (OCV) (for Intake Side
Pulse
generation
(see waveform
1)
D74-52 (OC2+) -
D74-51 (OC2-)
L-B - R-B
Camshaft timing oil control
valve (OCV) (for Intake Side
Pulse
generation
(see waveform
1)
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: TERMINALS...
TERMINAL NO.
(SYMBOLS)
WIRING
COLOR
TERMINAL DESCRIPTION
CONDITION
SPECIFIED
CONDITION
D74-56 (OE1+) -
D74-55 (OE1-)
L-W - L-B
Camshaft timing oil control
valve (OCV) (for Exhaust Side
Pulse
generation
(see waveform
1)
D74-50 (OE2+) -
D74-49 (OE2-)
L-R - L
Camshaft timing oil control
valve (OCV) (for Exhaust Side
Pulse
generation
(see waveform
1)
A24-34 (MREL) -
D74-81 (E1)
W - BR
EFI relay
Ignition switch ON
11 to 14 V
D74-74 (VG) -
D74-75 (E2G)
L-Y - G-W
Mass air flow meter
Idling, Shift lever position P
or N, A/C switch OFF
0.5 to 3.0 V
D74-73 (THA) -
D74-97 (ETHW)
Y-B - BR
Intake air temperature
sensor
Idling, Intake air
temperature 20°C (68°F)
0.5 to 3.4 V
D74-76 (THW) -
D74-98 (ETHA)
G-B - BR
Engine coolant temperature
sensor
Idling, Engine coolant
temperature 80°C (176°F)
0.2 to 1.0 V
D74-80 (VCTA) -
D74-79 (ETA)
Y - L
voltage)
Ignition switch ON
4.5 to 5.5 V
D74-78 (VTA1) -
D74-79 (ETA)
R-Y - L
Throttle position sensor (for
engine control)
Ignition switch ON,
Throttle valve fully closed
0.5 to 1.2 V
Ignition switch ON,
Throttle valve fully open
3.2 to 4.8 V
D74-77 (VTA2) -
D74-79 (ETA)
Y-B - L
Throttle position sensor (for
sensor malfunction detection)
Ignition switch ON,
Throttle valve fully closed
2.1 to 3.1 V
Ignition switch ON,
Throttle valve fully open
4.5 to 5.5 V
A24-55 (VPA) -
A24-58 (EPA)
W - BE
Accelerator pedal position
sensor (for engine control)
Ignition switch ON,
Accelerator pedal released
0.5 to 1.1 V
Ignition switch ON,
Accelerator pedal fully
depressed
2.6 to 4.5 V
A24-56 (VPA2) -
A24-60 (EPA2)
LG - P
Accelerator pedal position
sensor (for sensor
malfunctioning detection)
Ignition switch ON,
Accelerator pedal released
1.2 to 2.0 V
Ignition switch ON,
Accelerator pedal fully
depressed
3.4 to 4.7 V
A24-57 (VCPA) -
A24-58 (EPA)
B - BE
VPA)
Ignition switch ON
4.5 to 5.5 V
A24-59 (VCP2) -
A24-60 (EPA2)
V - P
VPA2)
Ignition switch ON
4.5 to 5.5 V
D74-22 (HA1A) -
L - W-B
A/F sensor heater
Idling
Below 3.0 V
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: TERMINALS...
TERMINAL NO.
(SYMBOLS)
WIRING
COLOR
TERMINAL DESCRIPTION
CONDITION
SPECIFIED
CONDITION
D74-23 (E04)
Ignition switch ON
11 to 14 V
D74-20 (HA2A) -
D74-21 (E05)
G - W-B
A/F sensor heater
Idling
Below 3.0 V
Ignition switch ON
11 to 14 V
D74-126 (A1A+)
- D74-81 (E1)
G -BR
A/F sensor
Ignition switch ON
3.3 V*1
D74-125 (A1A-) -
D74-81 (E1)
R - BR
A/F sensor
Ignition switch ON
2.9 V*1
D74-103 (A2A+)
- D74-81 (E1)
P - BR
A/F sensor
Ignition switch ON
3.3 V*1
D74-102 (A2A-) -
D74-81 (E1)
L - BR
A/F sensor
Ignition switch ON
2.9 V*1
D74-45 (HT1B) -
D74-46 (E03)
G-B - W-B Heated oxygen sensor heater
Idling
Below 3.0 V
Ignition switch ON
11 to 14 V
D74-44 (HT2B) -
D74-46 (E03)
B - W-B
Heated oxygen sensor heater
Idling
Below 3.0 V
Ignition switch ON
11 to 14 V
D74-114 (OX1B)
- D74-115 (EX1B)
G - L
Heated oxygen sensor
Engine speed maintained at
2500 rpm for 2 minutes after
warming up sensor
Pulse
generation
(see waveform
2)
D74-112 (OX2B)
- D74-113 (EX2B)
R - W
Heated oxygen sensor
Engine speed maintained at
2500 rpm for 2 minutes after
warming up sensor
Pulse
generation
(see waveform
2)
D74-86 (#10) -
D74-43 (E01)
R-L - W-B Injector
Ignition switch ON
11 to 14 V
Idling
Pulse
generation
(see waveform
3)
D74-109 (#20) -
D74-43 (E01)
L - W-B
Injector
Ignition switch ON
11 to 14 V
Idling
Pulse
generation
(see waveform
3)
D74-85 (#30) -
D74-43 (E01)
R - W-B
Injector
Ignition switch ON
11 to 14 V
Idling
Pulse
generation
(see waveform
3)
D74-108 (#40) -
D74-43 (E01)
Y - W-B
Injector
Ignition switch ON
11 to 14 V
Idling
Pulse
generation
(see waveform
3)
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: TERMINALS...
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