Toyota Sequoia (2005). Manual — part 68
A07621
A09776
1
2
L–W
P–L
OC1+
OC1–
OC2+
OC2–
17
L–B
R–L
1
2
E6
C13
OCV (Bank 1)
C14
OCV (Bank 2)
ECM
16
15
14
E6
E6
E6
–
DIAGNOSTICS
ENGINE
DI–75
269
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
If DTC P0010 displayed, check left bank OCV circuit.
If DTC P0020 displayed, check right bank OCV circuit.
Read freeze frame data using hand–held tester. Because freeze frame records the engine conditions
when the malfunction is detected. When troubleshooting, it is useful for determining whether the ve-
hicle was running or stopped, the engine was warmed up or not, the air–fuel ratio was lean or rich, etc.
at the time of the malfunction.
A31449
A23511
Valve
Battery –
Battery +
DI–76
–
DIAGNOSTICS
ENGINE
270
1
Check OCV circuit.
PREPARATION:
(a)
Connect the hand–held tester to the DLC3.
(b)
Start the engine and warm it up.
(c)
Turn the ignition switch to ON and turn the hand–held tester ON.
CHECK:
(a)
Select the item: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / VVT CTRL B1 or VVT CTRL B2.
(b)
Using the hand–held tester, operate the OCV and check the engine speed.
OK:
Standard:
Tester Operation
Specified Condition
OCV is OFF
Normal engine speed
OCV is ON
Rough idle or engine stall
OK
Check for intermittent problems
(See page
NG
2
Check operation of OCV.
PREPARATION:
(a)
Start the engine and warmed it up.
(b)
Disconnect the OCV connector.
(c)
Apply battery positive voltage between the terminals of
the OCV.
CHECK:
Check the engine speed.
OK:
Rough idle or engine stalled.
NG
Replace OCV.
OK
A02397
OCV Signal Waveform
1 msec./Division
5 V/
Division
GND
(A)
(A)
(A)
B17414
ECM Connector
E6
OC1+
OC1–
OC2+
OC2–
E1
–
DIAGNOSTICS
ENGINE
DI–77
271
3
Check voltage between terminals OC1+ and OC1–, OC2+ and OC2– of ECM con-
nector.
CHECK:
(a)
Inspection using the oscilloscope.
(b)
During idling, check the waveform between the specified
terminals of the E6 ECM connector.
HINT:
The waveform frequency (A) is lengthened as the engine speed
becomes higher.
OK:
Standard:
The correct waveform is as shown.
NG
Replace ECM (See page
OK
A23673
Wire Harness Side
C13
OCV Connector
C14
B17414
ECM Connector
E6
OC1+
OC1–
OC2+
OC2–
E1
DI–78
–
DIAGNOSTICS
ENGINE
272
4
Check for open and short in harness and connector between OCV and ECM.
PREPARATION:
(a)
Disconnect the C13 or C14 OCV connector.
(b)
Disconnect the E6 ECM connector.
CHECK:
(a)
Check for resistance between the wire harness side con-
nectors.
OK:
Standard (Check for open):
Symbols (Terminal No.)
Specified condition
OCV (C14–1) – OC1+ (E6–17)
Below 1
Ω
OCV (C14–2) – OC1– (E6–16)
Below 1
Ω
OCV (C13–1) – OC2+ (E6–15)
Below 1
Ω
OCV (C13–2) – OC2– (E6–14)
Below 1
Ω
Standard (Check for short):
Symbols (Terminal No.)
Specified condition
OCV (C14–1) or OC1+ (E6–17) – E1 (E6–1)
10 k
Ω
or higher
OCV (C14–1) or OC1– (E6–16) – E1 (E6–1)
10 k
Ω
or higher
OCV (C13–1) or OC2+ (E6–15) – E1 (E6–1)
10 k
Ω
or higher
OCV (C13–1) or OC2– (E6–14) – E1 (E6–1)
10 k
Ω
or higher
NG
Repair or replace harness or connector.
OK
Check for intermittent problems
(See page
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