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DI-642
DIAGNOSTICS - ENGINE (2UZ-FE)
DICN4-02
DTC P0351 Ignition Coil "A" Primary/Secondary Circuit
DTC P0352 Ignition Coil "B" Primary/Secondary Circuit
DTC P0353 Ignition Coil "C" Primary/Secondary Circuit
DTC P0354 Ignition Coil "D" Primary/Secondary Circuit
DTC P0355 Ignition Coil "E" Primary/Secondary Circuit
DTC P0356 Ignition Coil "F" Primary/Secondary Circuit
DTC P0357 Ignition Coil "G" Primary/Secondary Circuit
DTC P0358 Ignition Coil "H" Primary/Secondary Circuit
HINT:
S These DTCs indicate a malfunction related to primary circuit.
S If DTC P0351 is displayed, check No. 1 ignition coil with igniter circuit.
S If DTC P0352 is displayed, check No. 2 ignition coil with igniter circuit.
S If DTC P0353 is displayed, check No. 3 ignition coil with igniter circuit.
S If DTC P0354 is displayed, check No. 4 ignition coil with igniter circuit.
S If DTC P0355 is displayed, check No. 5 ignition coil with igniter circuit.
S If DTC P0356 is displayed, check No. 6 ignition coil with igniter circuit.
S If DTC P0357 is displayed, check No. 7 ignition coil with igniter circuit.
S If DTC P0358 is displayed, check No. 8 ignition coil with igniter circuit.
DI-643
DIAGNOSTICS - ENGINE (2UZ-FE)
CIRCUIT DESCRIPTION
These DTCs indicate a malfunction related to primary circuit.
The DIS is a 1-cylinder ignition system which ignites one cylinder with one ignition coil. In the 1-cylinder
ignition system, the one spark plug is connected to the end of the secondary winding. High voltage generated
in the secondary winding is applied directly to the spark plug. The spark of the spark plug passes from the
center electrode to the ground electrode.
The ECM determines the ignition timing and outputs the ignition signals (IGTs) for each cylinder. Using the
IGT, the ECM turns on and off the power transistor inside the igniter and this switches on and off the current
to the primary coil. When the current to the primary coil is cut off, high-voltage is generated in the secondary
coil and this voltage is applied to the spark plugs to create sparks inside the cylinders. As the ECM cuts the
current to the primary coil, the igniter sends back the ignition confirmation signal (IGF) for each cylinder igni-
tion to the ECM.
From Battery
ECM Igniter
No.1 Ignition Coil with Igniter
IGT1
IGF1 No. 1 Cylinder
Ignition Coil Spark Plug
Crankshaft
Position
Sensor IGT2 No. 2 Ignition
Coil with Igniter
No. 2 Cylinder
IGF2
IGT3 No. 3 Ignition
No. 3 Cylinder
Coil with Igniter
Camshaft IGT4 No. 4 Ignition
No. 4 Cylinder
Position Coil with Igniter
Sensor
IGT5 No. 5 Ignition
Coil with Igniter
No. 5 Cylinder
IGT6 No. 6 Ignition
Coil with Igniter
No. 6 Cylinder
Other Sensors:
(Engine Coolant Temp.
Sensor, Mass Air Flow
IGT7 No. 7 Ignition
Sensor, Throttle Position Coil with Igniter
No. 7 Cylinder
Sensor, etc.)
IGT8 No. 8 Ignition
No. 8 Cylinder
Coil with Igniter
TAC
To Tachometer A21429
DI-644
DIAGNOSTICS - ENGINE (2UZ-FE)
DTC No. DTC Detecting Condition Trouble Area
P0351
P0352
S Open or short in IGF1 or IGF2 and IGT1 to IGT8 circuit from
P0353
ignition coil with igniter to ECM
P0354
No IGF signal to ECM while engine is running S No. 1 to No. 8 ignition coil with igniter (primary ignition)
P0355
S Ignition system
P0356
S ECM
P0357
P0358
IGT Signal Waveform Reference: Inspection using the oscilloscope.
During cranking or idling, check the waveform between termi-
nals IG1 to IG8 and E1, and IGF1, IGF2 and E1 of the E5 and
IGT E7 ECM connectors.
GND
IGF
GND
20 msec./Division
A03401
MONITOR DESCRIPTION
Ignition Coil with Igniter
IGT
Ignition Coil
ECM Igniter
IGF
Ignition signal
(IGT)
Ignition Normal
confirmation
signal (IGF) Malfunction
Circuit Open
Time
A20793
If the ECM does not receive the IGF after sending the IGT it interprets this as a fault in the igniter and sets
a DTC.
DI-645
DIAGNOSTICS - ENGINE (2UZ-FE)
MONITOR STRATEGY
P0351 No. 1 ignition coil with igniter circuit malfunction
P0352 No. 2 ignition coil with igniter circuit malfunction
P0353 No. 3 ignition coil with igniter circuit malfunction
P0354 No. 4 ignition coil with igniter circuit malfunction
Related DTC
R l t d DTCs
P0355 No. 5 ignition coil with igniter circuit malfunction
P0356 No. 6 ignition coil with igniter circuit malfunction
P0357 No. 7 ignition coil with igniter circuit malfunction
P0358 No. 8 ignition coil with igniter circuit malfunction
Required sensors/components Igniter
Frequency of operation Continuous
Duration 0.256 sec. + 4 sparks
MIL operation Immediate
Sequence of operation None
TYPICAL ENABLING CONDITIONS
Specification
Item
It
Minimum Maximum
The monitor will run whenever these
See page DI-437
DTCs are not present
Either of the following conditions is met: Condition 1 or 2
1. Engine speed - 1,500 rpm
2. Starter OFF
Either of the following conditions is met: Condition (a) or (b)
(a) All of the following conditions are met -
Engine speed - 500 rpm
Battery voltage 6V -
(b) All of the following conditions are met -
Engine speed 500 rpm -
Battery voltage 10 V -
Number of sparks after CPU is reset 5 sparks -
TYPICAL MALFUNCTION THRESHOLDS
Detection Criteria Threshold
"Ignition signal fail count" More than 2 times
"Ignition signal fail count" is on the right: When IGF does not return despite sending IGT.
COMPONENT OPERATING RANGE
Standard Value
Confirmed signal number = ignition signal number
DI-646
DIAGNOSTICS - ENGINE (2UZ-FE)
WIRING DIAGRAM
Access Cab, Standard Cab: 24 ECM
L-B E7 IGF1
25
L-W
E7 IGF2
I10
Ignition Coil with Igniter No. 8 9
L-W LG E7 IGT8
W-B 2 3
I9
4 1
Ignition Coil with Igniter No. 7 B-R 14
L-B 3 P
E7 IGT7
2 B-R
W-B
L-B I8 4
1
W-B Ignition Coil with Igniter No. 6 B-R 12
L-B 3 V
2 E7 IGT6
W-B B-R
I7 4 1
Ignition Coil with Igniter No. 5 B-R 13
W-B L-W 3 W-R
L-B E7 IGT5
W-B 2 B-R
I6 4
1
W-B Ignition Coil with Igniter No. 4 B-R 10
L-B 3 G-R E7 IGT4
2 B-R
W-B
I5 4 1
Ignition Coil with Igniter No. 3 B-R 11
W-B L-W 3 L
2 E7 IGT3
W-B B-R
L-B 1
I4 4
W-B Ignition Coil with Igniter No. 2 B-R 15
L-W 3 LG-B
E7 IGT2
W-B 2 B-R
I3 4 1
W-B Ignition Coil with Igniter No. 1 B-R 8
L-B 3 L-Y
2 E7 IGT1
W-B B-R
4 1
B-R
Driver Side J/B
I23 Ignition SW
N1 Noise Filter No. 1 13 7 4
W-B B-R B-R IE1 B-R
1J B-R
1I
2 1 6 IG2 AM2 7
Engine Room R/B
W-B B-L*1 AM2 8
B*2 W-R IA9 W-R
2 2
1 2
EC Battery
*1: Towing Package
*2: Except Towing Package
A23598
DI-647
DIAGNOSTICS - ENGINE (2UZ-FE)
Double Cab: 24 ECM
L-B E7 IGF1
L-W 25
E7 IGF2
I10
Ignition Coil with Igniter No. 8 9
L-W LG E7 IGT8
W-B 2 3
4 1
I9
Ignition Coil with Igniter No. 7 B-R 14
L-B 3 P
E7 IGT7
2 B-R
W-B
L-B I8 4 1
W-B Ignition Coil with Igniter No. 6 B-R 12
L-B 3 V
2 E7 IGT6
W-B B-R
I7 4 1
Ignition Coil with Igniter No. 5 B-R 13
W-B L-W 3 W-R
L-B E7 IGT5
W-B 2 B-R
I6 4
1
W-B Ignition Coil with Igniter No. 4 B-R
10
L-B 3 G-R E7 IGT4
2 B-R
W-B
I5 4 1
Ignition Coil with Igniter No. 3 B-R
W-B 11
L-W 3 L
2 E7 IGT3
W-B B-R
L-B 1
I4 4
W-B Ignition Coil with Igniter No. 2 B-R 15
L-W 3 LG-B
E7 IGT2
W-B 2 B-R
I3 4 1
W-B Ignition Coil with Igniter No. 1 B-R 8
L-B 3 L-Y
2 E7 IGT1
W-B B-R
4 1
B-R
Driver Side J/B
I23 Ignition SW
N1 Noise Filter No. 1 IGN2
13 2 2
W-B B-R B-R IE1 B-R B-R
2 1 1D 1C
6 IG2 AM2 5
F13 Engine Room R/B Driver Side J/B
W-B
FL Block
1 AM2 1 7 3
B B W-R W-R
2D 2C 1J 1C
12 10
EC Battery
A23599
DI-648
DIAGNOSTICS - ENGINE (2UZ-FE)
INSPECTION PROCEDURE
HINT:
S If DTCs P0351, P0354, P0356 and P0357 are output simultaneously, IGF1 circuit may be open or
short.
S If DTCs P0352, P0353, P0355 and P0358 are output simultaneously, IGF2 circuit may be open or
short.
S Read freeze frame data using the hand-held tester. Freeze frame data records the engine conditions
when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the
vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or
rich, as well as other data from the time when a malfunction occurred.
1 Check spark plug and spark (See page IG-1).
NG Go to step 4.
OK
DI-649
DIAGNOSTICS - ENGINE (2UZ-FE)
2 Check for open and short in harness and connector in IGF signal circuits be-
tween ECM and ignition coil with igniter.
PREPARATION:
Wire Harness Side:
(a) Disconnect the I3, I4, I5, I6, I7, I8, I9 or I10 ignition coil will
I3 I4 igniter connector.
I5 I6 (b) Disconnect the E7 ECM connector.
CHECK:
I7 I8
Check the resistance between the wire harness side connec-
I9 I10
tors.
Ignition Coil with Igniter Connector OK:
A21025 Standard:
Tester Connection Specified Condition
E7 Ignition coil (I3-2) - IGF1 (E7-24) Below 1
Ignition coil (I4-2) - IGF2 (E7-25) Below 1
Ignition coil (I5-2) - IGF1 (E7-24) Below 1
Ignition coil (I6-2) - IGF2 (E7-25) Below 1
Ignition coil (I7-2) - IGF1 (E7-24) Below 1
Ignition coil (I8-2) - IGF2 (E7-25) Below 1
IGF1
IGF2 Ignition coil (I9-2) - IGF1 (E7-24) Below 1
ECM Connector B17412 Ignition coil (I10-2) - IGF2 (E7-25) Below 1
Ignition coil (I3-2) or IGF1 (E7-24) -
10 k or higher
Body ground
Ignition coil (I4-2) or IGF2 (E7-25) -
10 k or higher
Body ground
Ignition coil (I5-2) or IGF1 (E7-24) -
10 k or higher
Body ground
Ignition coil (I6-2) or IGF2 (E7-25) -
10 k or higher
Body ground
Ignition coil (I7-2) or IGF1 (E7-24) -
10 k or higher
Body ground
Ignition coil (I8-2) or IGF2 (E7-25) -
10 k or higher
Body ground
Ignition coil (I9-2) or IGF1 (E7-24) -
10 k or higher
Body ground
Ignition coil (I10-2) or IGF2 (E7-25) -
10 k or higher
Body ground
NG Repair or replace harness or connector.
OK
DI-650
DIAGNOSTICS - ENGINE (2UZ-FE)
3 Disconnect ignition coil with igniter connector, and check voltage between ter-
minals IGF1, IGF2 and E1 of ECM connector.
PREPARATION:
(a) Disconnect the I3, I4, I5, I6, I7, I8, I9 or I10 ignition coil
E7 E5 with igniter connector.
(b) Turn the ignition switch ON.
CHECK:
Measure the voltage between the E7 and E5 ECM connectors.
OK:
IGF2 (+) IGF1 (+) E1 (-) Standard:
B17411 Tester Connection Specified Condition
IGF1 (E7-24) - E1 (E5-1) 4.5 to 5.5 V
IGF2 (E7-25) - E1 (E5-1) 4.5 to 5.5 V
NG Replace ECM (See page SF-82).
OK
Replace ignition coil with igniter.
DI-651
DIAGNOSTICS - ENGINE (2UZ-FE)
4 Check for open and short in harness and connector in IGT signal circuit between
ECM and ignition coil with igniter.
Wire Harness Side: PREPARATION:
(a) Disconnect the I3, I4, I5, I6, I7, I8, I9 or I10 ignition coil
I3 I4 connector.
I5 I6 (b) Disconnect the E7 ECM connector.
I7 I8
CHECK:
Check the resistance between the wire harness side connec-
I9 I10
tors.
Ignition Coil with Igniter Connector
OK:
A21025 Standard:
Tester Connection Specified Condition
E7 Ignition coil (I3-2) - IGT1 (E7-8) Below 1
Ignition coil (I4-2) - IGT2 (E7-15) Below 1
Ignition coil (I5-2) - IGT3 (E7-11) Below 1
Ignition coil (I6-2) - IGT4 (E7-10) Below 1
IGT2 IGT1 Ignition coil (I7-2) - IGT5 (E7-13) Below 1
IGT8 Ignition coil (I8-2) - IGT6 (E7-12) Below 1
IGT4 Ignition coil (I9-2) - IGT7 (E7-14) Below 1
IGT7 IGT3 ECM Connector
IGT5 Ignition coil (I10-2) - IGT8 (E7-9) Below 1
IGT6 B17412
Ignition coil (I3-2) or IGT1 (E7-8) -
10 k or higher
Body ground
Ignition coil (I4-2) or IGT2 (E7-15) -
10 k or higher
Body ground
Ignition coil (I5-2) or IGT3 (E7-11) -
10 k or higher
Body ground
Ignition coil (I6-2) or IGT4 (E7-10) -
10 k or higher
Body ground
Ignition coil (I7-2) or IGT5 (E7-13) -
10 k or higher
Body ground
Ignition coil (I8-2) or IGT6 (E7-12) -
10 k or higher
Body ground
Ignition coil (I9-2) or IGT7 (E7-14) -
10 k or higher
Body ground
Ignition coil (I10-2) or IGT8 (E7-9) -
10 k or higher
Body ground
NG Repair or replace harness or connector.
OK
DI-652
DIAGNOSTICS - ENGINE (2UZ-FE)
5 Check voltage between terminals IGT1 - IGT8 and E1 of ECM connector.
PREPARATION:
IGT3 (+)IGT4 (+) Turn the ignition switch to ON.
IGT6(+) IGT8 (+) E1(-)
IGT1(+) CHECK:
Measure the voltage between terminals the E7 and E5 ECM
connectors when the engine is cranked.
OK:
IGT2(+) Standard:
IGT7(+) IGT5(+)
Tester Connection Specified Condition
E7 E5
B17411
IGT1 (E7-8) - E1 (E5-1) More than 0.1 V or less than 4.5 V
IGT2 (E7-15) - E1 (E5-1) More than 0.1 V or less than 4.5 V
IGT3 (E7-11) - E1 (E5-1) More than 0.1 V or less than 4.5 V
IGT4 (E7-10) - E1 (E5-1) More than 0.1 V or less than 4.5 V
IGT5 (E7-13) - E1 (E5-1) More than 0.1 V or less than 4.5 V
IGT6 (E7-12) - E1 (E5-1) More than 0.1 V or less than 4.5 V
IGT7 (E7-14) - E1 (E5-1) More than 0.1 V or less than 4.5 V
IGT8 (E7-9) - E1 (E5-1) More than 0.1 V or less than 4.5 V
NG Replace ECM (See page SF-82).
OK
DI-653
DIAGNOSTICS - ENGINE (2UZ-FE)
6 Disconnect ignition coil with igniter connector, and check voltage between ter-
minals IGT1 - IGT8 and E1 of ECM connector.
PREPARATION:
IGT3 (+)IGT4 (+) (a) Disconnect the I3, I4, I5, I6, I7, I8, I9 or I10 ignition coil
IGT6(+) IGT8 (+) E1(-)
IGT1(+) with igniter connector.
(b) Turn the ignition switch to ON.
CHECK:
Measure the voltage between terminals the E5 and E7 ECM
IGT2(+) connectors when the engine is cranked.
IGT7(+) IGT5(+)
OK:
E7 E5 Standard:
B17411
Tester Connection Specified Condition
IGT1 (E7-8) - E1 (E5-1) 4.5 V or more
IGT2 (E7-15) - E1 (E5-1) 4.5 V or more
IGT3 (E7-11) - E1 (E5-1) 4.5 V or more
IGT4 (E7-10) - E1 (E5-1) 4.5 V or more
IGT5 (E7-13) - E1 (E5-1) 4.5 V or more
IGT6 (E7-12) - E1 (E5-1) 4.5 V or more
IGT7 (E7-14) - E1 (E5-1) 4.5 V or more
IGT8 (E7-9) - E1 (E5-1) 4.5 V or more
NG Replace ECM (See page SF-82).
OK
DI-654
DIAGNOSTICS - ENGINE (2UZ-FE)
7 Check ignition coil with igniter power source circuit.
Wire Harness Side:
PREPARATION:
(a) Disconnect the I3, I4, I5, I6, I7, I8, I9 or I10 ignition coil
with igniter connector.
I3 I4
(b) Turn the ignition switch to ON.
I5 I6 CHECK:
I7 I8 Measure the voltage between the terminal of the wire harness
I9 I10 side connector and body ground.
Ignition Coil with
Igniter Connector OK:
A21025 Standard:
Tester Connection Specified Condition
I3-1 - Body ground
I4-1 - Body ground
I5-1 - Body ground
I6-1 - Body ground
9 t 14 V
to
I7-1 - Body ground
I8-1 - Body ground
I9-1 - Body ground
I10-1 - Body ground
OK Repair ignition coil with igniter.
NG
DI-655
DIAGNOSTICS - ENGINE (2UZ-FE)
8 Check for open and short in harness and connector between ignition switch and
ignition coil with igniter.
Wire Harness Side:
PREPARATION:
(a) Disconnect the I3, I4, I5, I6, I7, I8, I9 or I10 ignition coil
with igniter connector.
I3 I4
(b) Disconnect the I23 ignition switch connector.
I5 I6 CHECK:
I7 I8 Measure the resistance between the wire harness side connec-
I9 I10 tors.
Ignition Coil with Igniter
OK:
A21025 Standard:
Tester Connection Specified Condition
Wire Harness Side: Ignition coil (I3-1) - IG2 (I23-6) Below 1
I23 Ignition coil (I4-1) - IG2 (I23-6) Below 1
Ignition coil (I5-1) - IG2 (I23-6) Below 1
Ignition coil (I6-1) - IG2 (I23-6) Below 1
Ignition coil (I7-1) - IG2 (I23-6) Below 1
Ignition coil (I8-1) - IG2 (I23-6) Below 1
Ignition coil (I9-1) - IG2 (I23-6) Below 1
IG2
Ignition Switch A21378 Ignition coil (I10-1) - IG2 (I23-6) Below 1
Ignition coil (I3-1) or IG2 (I23-6) -
10 k or higher
Body ground
Ignition coil (I4-1) or IG2 (I23-6) -
10 k or higher
Body ground
Ignition coil (I5-1) or IG2 (I23-6) -
10 k or higher
Body ground
Ignition coil (I6-1) or IG2 (I23-6) -
10 k or higher
Body ground
Ignition coil (I7-1) or IG2 (I23-6) -
10 k or higher
Body ground
Ignition coil (I8-1) or IG2 (I23-6) -
10 k or higher
Body ground
Ignition coil (I9-1) or IG2 (I23-6) -
10 k or higher
Body ground
Ignition coil (I10-1) or IG2 (I23-6) -
10 k or higher
Body ground
NG Repair or replace harness or connector.
OK
Replace ignition coil with igniter.
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