Toyota Sequoia (2005). Manual — part 89
–
DIAGNOSTICS
ENGINE
DI–159
353
6
Check whether DTC output recurs (DTC P0138, P0158)
CHECK:
(a)
On the hand–held tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC
INFO / CURRENT CODES.
(b)
Read DTCs.
RESULT:
Display (DTC Output)
Proceed To
P0138 or P0158
A
No output
B
B
Check for intermittent problems
(See page
A
Replace heated oxygen sensor.
7
Check output voltage of heated oxygen sensor.
PREPARATION:
(a)
Connect the hand–held tester to the DLC3.
(b)
Turn the ignition switch to ON and turn the tester ON.
(c)
Start the engine.
(d)
Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / O2S B1S2.
(e)
After warming up the engine, run the engine at an engine speed of 2,500 rpm for 3 minutes.
CHECK:
(a)
Read the output voltage of the HO2 sensor when the engine rpm is suddenly increased.
HINT:
Quickly accelerate the engine to 4,000 rpm 3 times using the accelerator pedal.
Standard: Fluctuates between 0.4 V or less and 0.5 V or more.
NG
Go to step 14.
OK
8
Perform confirmation driving pattern.
NEXT
DI–160
–
DIAGNOSTICS
ENGINE
354
9
Check whether DTC output recurs (DTC P0136, P0156)
CHECK:
(a)
On the hand–held tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC
INFO / PENDING CODES.
(b)
Read DTCs.
RESULT:
Display (DTC Output)
Proceed To
P0136 or P0156
A
No output
B
B
Check for intermittent problems
(See page
A
10
Replace heated oxygen sensor.
NEXT
11
Perform confirmation driving pattern.
NEXT
12
Check whether DTC output recurs (DTC P0136, P0156)
CHECK:
(a)
On the hand–held tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC
INFO / PENDING CODES.
(b)
Read DTCs.
RESULT:
Display (DTC Output)
Proceed To
P0136 or P0156
A
No output
B
B
Repair completed.
A
B17391
+12 %
Normal
Malfunction
–12 %
0 V
3.3 V
1 V
A/F Sensor Output
HO2 Sensor Output
Injection Volume
Malfunction
–
DIAGNOSTICS
ENGINE
DI–161
355
13
Perform active test (injection volume).
PREPARATION:
(a)
Connect the hand–held tester to the DLC3.
(b)
Start the engine and turn the tester ON.
(c)
Warm up the engine.
(d)
Select the following menu items: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / INJ VOL.
CHECK:
(a)
Change the fuel injection volume using the tester, monitoring the voltage output of Air–Fuel Ratio (A/F)
and HO2 sensors displayed on the tester.
HINT:
Change the fuel injection volume within the range of –12 % and +12 %. The injection volume can be
changed in 1 % graduations within the range.
The A/F sensor is displayed as AFS B1S1 (AFS B2S1), and the HO2 sensor is displayed as O2S B1S2
(O2S B2S2), on hand–held testers.
RESULT:
Tester Display (Sensor)
Voltage Variations
Proceed To
AFS B1S1 (AFS B2S1) (A/F)
Alternates between more and less than 3.3 V
OK
AFS B1S1 (AFS B2S1) (A/F)
Remains at more than 3.3 V
NG
AFS B1S1 (AFS B2S1) (A/F)
Remains at less than 3.3 V
NG
HINT:
A normal HO2 sensor voltage (O2S B1S2 (O2S B2S2)) reacts in accordance with increases and decreases
in fuel injection volumes. When the A/F sensor voltage remains at either less or more than 3.3 V despite the
HO2 sensor indicating a normal reaction, the A/F sensor is malfunctioning.
NG
Replace air–fuel ratio (A/F) sensor.
OK
A21341
+B
OX
E1
HT
H2
H4
Components Side:
Bank 1 Sensor 2, Bank 2 Sensor 2
DI–162
–
DIAGNOSTICS
ENGINE
356
check and repair extremely rich or lean actu-
arial air fuel ratio (injector, fuel pressure, gas
leakages from exhaust system, etc.)
14
Check for exhaust gas leakage.
CHECK:
Check for exhaust gas leakage from the exhaust manifold and pipe.
OK: No exhaust gas leakage.
NG
Repair or replace exhaust gas leakage point.
OK
15
Inspect heated oxygen sensor.
PREPARATION:
Disconnect the HO2 sensor connector.
CHECK:
Measure the resistance between the terminals of the HO2 sen-
sor connector.
OK:
Standard:
Tester Connections
Specified Conditions
HT (2) – +B (1)
11 to 16
Ω
at 20
C (68
F)
HT (2) – E (3)
10 k
Ω
or higher
NG
Replace heated oxygen sensor.
OK
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