2001 TOYOTA SEQUOIA side step

± DIAGNOSTICSENGINE
DI±157
351 Author: Date:
2005 SEQUOIA (RM1146U)
1 Read output DTC.
PREPARATION:
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch ON and push the hand±held tester main switch ON.
(c) When using hand±held tester, enter the following menu: DIAGNOSIS / ENHANCED OBD II / DTC
INFO / CURRENT CODES.
CHECK:
Read the DTC using the hand±held tester.
RESULT:
Display (DTC Output)Proceed to
P0138, P0158A
P0137, P0157B
P0136, P0156C
HINT:
If any other codes besides P0136, P0137, P0138, P0156, P0157 and/or P0158 are output, perform the trou-
bleshooting for those DTCs first.
B Go to step 14.
C Go to step 7.
A
2 Check output voltage of heated oxygen sensor.
PREPARATION:
(a) Connect the hand±held tester to the DLC3.
(b) After warming up the engine, run the engine at 2,500 rpm for 3 minutes.
(c) When using hand±held tester, enter the following menu: DIAGNOSIS / ENHANCED OBD II / DATA
LIST / ALL / O2S B1S2 or B2S2.
(d) Allow the engine to idle.
CHECK:
Read the Heated Oxygen (HO2) sensor output voltage while idling.
RESULT:
HO2 Sensor Output VoltagesProceed To
More than 1.2 VA
Less than 1.0 VB
B Go to step 5.
A

B17440
A46
Air Switching Valve Connector Wire Harness Side:
± DIAGNOSTICSENGINE
DI±239
433 Author: Date:
2005 SEQUOIA (RM1146U)
HINT:

Using the AIR INJ CHECK operation of the SYSTEM CHECK provided in the hand±held tester func-
tion, conditions for air±fuel ratio and pressure in the secondary air injection system passage can be
checked while the secondary air injection system operating. It helps technicians to troubleshoot the
system when it malfunctioning.

Read freeze frame data using a hand±held tester. Freeze frame data record the engine condition when
malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle
was moving or stationary, if the engine was warmed up or not, if the air±fuel ratio was lean or rich, and
other data, from the time the malfunction occurred.
1 Check voltage between terminal 1 of air switching valve connector and body
ground.
PREPARATION:
(a) Remove the intake manifold (see page EM±36).
(b) Disconnect the A46 air switching valve connector.
(c) Connect the hand±held tester to the DLC3.
(d) Turn the ignition switch ON and turn the tester ON.
CHECK:
(a) When the air switching valve is operated using the hand±
held tester, measure voltage between terminal A46±1 of
the air switching valve connector and body ground.
(b) Select the following menu items: DIAGNOSIS/EN-
HANCED OBD II/SYSTEM CHECK/ AIR INJ CHECK/
MANUAL OPERATION/OPERATION 1 and 4
HINT:
OPERATION 1: AP:OFF, EASV:CLOSE, ASV1:CLOSE,
ASV2:CLOSE
OPERATION 4: AP:OFF, EASV:OPEN, ASV1:CLOSE,
ASV2:CLOSE
NOTICE:
This test only allows technicians to operate the AI system
for 5 seconds. Furthermore, the test can be performed 4
times a trip. If the test is repeated, intervals of at least 30
seconds are required between tests.
While the AI system operation using the hand±held tester
is prohibited, the tester displays the prohibition (WAIT or
ERROR). If the ERROR (AI STATUS NG) is displayed on the
tester, stop the engine for 10 minutes and then try again..
OK:
Standard:
Tester operationTester ConnectionSpecified Condition
Operation 4A46±1 ± Body ground10 V or more
Operation 1A46±1 ± Body groundBelow 1.0 V
NG Go to step 4.
OK

B17438
Wire Harness Side:
Air Pump Connector
A43
DI±246
± DIAGNOSTICSENGINE
440 Author: Date:
2005 SEQUOIA (RM1146U)
HINT:

Using the AIR INJ CHECK operation of the SYSTEM CHECK provided in the hand±held tester func-
tion, conditions for air±fuel ratio and pressure in the secondary air injection system passage can be
checked while the secondary air injection system operating. It helps technicians to troubleshoot the
system when it malfunctioning.

Read freeze frame data using a hand±held tester. Freeze frame data record the engine condition when
malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle
was moving or stationary, if the engine was warmed up or not, if the air±fuel ratio was lean or rich, and
other data, from the time the malfunction occurred.
1 Check voltage between terminal 2 of air pump and body ground.
PREPARATION:
(a) Remove the intake manifold (see page EM±36).
(b) Disconnect the A43 air pump connector.
(c) Connect the hand±held tester to the DLC3.
(d) Turn the ignition switch ON and turn the tester ON.
CHECK:
(a) When the air pump is operated using the hand±held tes-
ter, measure the voltage between terminal A43±2 of the
air injection driver connector and body ground.
(b) Select the following menu items: DIAGNOSIS/EN-
HANCED OBD II/SYSTEM CHECK/ AIR INJ CHECK/
MANUAL OPERATION/OPERATION 1 and 3
HINT:
OPERATION 1: AP:OFF, EASV:CLOSE, ASV1:CLOSE,
ASV2:CLOSE
OPERATION 3: AP:ON, EASV:OPEN, ASV1:OPEN,
ASV2:OPEN
NOTICE:
This test only allows technicians to operate the AI system
for 5 seconds. Furthermore, the test can be performed 4
times a trip. If the test is repeated, intervals of at least 30
seconds are required between tests.
While the AI system operation using the hand±held tester
is prohibited, the tester displays the prohibition (WAIT or
ERROR). If the ERROR (AI STATUS NG) is displayed on the
tester, stop the engine for 10 minutes and then try again..
OK:
Standard:
Tester operationTester ConnectionSpecified Condition
Operation 3A43±2 ± Body ground10 V or more
Operation 1A43±2 ± Body groundBelow 1.0 V
NG Go to step 4.
OK

A23508
Wire Harness Side:
Canister Connector
Front View
L5
A23446
L5
± DIAGNOSTICSENGINE
DI±271
465 Author: Date:
2005 SEQUOIA (RM1146U)
4 Measure voltage and resistance of pump module connector.
PREPARATION:
(a) Disconnect the L5 canister connector.
(b) Turn the ignition switch to ON.
CHECK:
Measure the voltage and resistance of the L5 connector.
OK:
Standard:
Tester ConnectionsSpecified Conditions
L5±4 ± Body groundBetween 4.5 V and 5.5 V
L5±3 ± Body groundBetween 4.5 V and 5.5 V
L5±2 ± Body ground100 W or less
RESULT:
Test ResultsSuspected Trouble AreasProceed To
Voltage and resistance within standard ranges
Open in pressure sensor circuitA
Voltage and resistance outside standard ranges
Open in wire harness/connector (ECM ± pressure sensor)B
B Go to step 6.
A
5 Replace charcoal canister assembly.
NEXT Go to step 8.
6 Repair or replace wire harness and connectors.
HINT:
If the exhaust tail pipe has been removed, go to the next step before reinstalling it.
NEXT Go to step 8.

P22487
Vehicle Speed
SensorCombination
MeterECM 4±pulse 4±pulse DI±278
± DIAGNOSTICSENGINE
472 Author: Date:
2005 SEQUOIA (RM1146U)
DTC P0500 Vehicle Speed Sensor ºAº
DTC P0503 Vehicle Speed Sensor ºAº Intermittent/
Erratic/High
CIRCUIT DESCRIPTION
The No.1 vehicle speed sensor outputs a 4±pulse signal for every revolution of the rotor shaft, which is ro-
tated by the transmission output shaft via the driven gear. After this signal is converted into a more precise
rectangular waveform by the waveform shaping circuit inside the combination meter, it is then transmitted
to the ECM. The ECM determines the vehicle speed based on the frequency of these pulse signals.
DTC No.Proceed toDTC Detection ConditionTrouble Area
P0500Step 1
No vehicle speed sensor sig-
nal to ECM under following
conditions: (2 trip detection
logic)

Vehicle is being driven

Combination meter

Open or short in vehicle speed sensor circuit

Vehicle speed sensor
ECM
P0503DI±11Intermittent problem in the ve-
hicle speed sensor circuit
ECM
MONITOR DESCRIPTION
The ECM assumes that the vehicle is driven when the park/neutral position switch is OFF and it has been
over 4 sec. since the actual vehicle speed was 9 km/h (6 mph) or more.
If there is no signal from the vehicle speed sensor when these conditions are satisfied, the ECM concludes
that there is a fault in the vehicle speed sensor. The ECM will turn on the MIL and a DTC is set.
DID8B±01

B17440
A46
Air Switching Valve Connector Wire Harness Side:
DI±322
± DIAGNOSTICSENGINE
516 Author: Date:
2005 SEQUOIA (RM1146U)
NG Replace air switching valve and go to step 7.
OK
3 Check voltage between terminal 1 of air switching valve and body ground.
PREPARATION:
(a) Remove the intake manifold (see page EM±36).
(b) Disconnect the A46 air switching valve connector.
(c) Turn the ignition switch ON.
CHECK:
Measure the voltage between terminal 1 of the air switching
valve connector and body ground.
OK:
Standard:
Tester ConnectionSpecified Condition
A46±1 ± Body groundBelow 1.0 V
NG Go to step 4.
OK
Check for intermittent problems
(See page DI±11) and go to step 7.

B17444
Wire Harness Side:
Air Injection Driver Connector
A41
VV
B17440
A46
Air Switching Valve Connector Wire Harness Side:
B17444
Wire Harness Side:
Air Injection Driver Connector
A41
SIV
± DIAGNOSTICSENGINE
DI±323
517 Author: Date:
2005 SEQUOIA (RM1146U)
4 Check for open and short in harness and connector between air injection driver
and air switching valve.
PREPARATION:
(a) Remove the intake manifold (see page EM±36).
(b) Disconnect the A41 air injection driver connector.
(c) Disconnect the A46 air switching valve connector.
(d) Disconnect the battery positive terminal cable.
CHECK:
Measure the resistance between the wire harness side connec-
tors.
OK:
Standard:
Tester ConnectionSpecified Condition
VV (A41±6) ± A46±1Below 1 W
VV (A41±6) or A46±1 ±
Battery positive terminal cable10 kW or higher
NG Repair or replace harness or connector.
OK
5 Check voltage between SIV terminal of air injection driver and body ground.
PREPARATION:
(a) Disconnect the A41 air injection driver connector.
(b) Turn the ignition switch ON.
CHECK:
Measure the voltage between terminal 3 (SIV) of the air injec-
tion driver connector and body ground.
OK:
Standard:
Tester ConnectionSpecified Condition
3 (SIV) ± Body ground10 V or more
NG Go to step 6.
OK
Replace air injection driver.

B17440
A46
Air Switching Valve Connector Wire Harness Side:
DI±334
± DIAGNOSTICSENGINE
528 Author: Date:
2005 SEQUOIA (RM1146U)
3 Check voltage between terminal 1 of air switching valve and body ground.
PREPARATION:
(a) Remove the intake manifold (see page EM±36).
(b) Disconnect the A46 air switching valve connector.
(c) Connect the hand±held tester to the DLC3.
(d) Turn the ignition switch ON and turn the tester ON.
CHECK:
(a) When the air switching valve is operated using the hand±
held tester, measure voltage between terminal A46±1 of
the air switching valve connector and body ground.
(b) Select the following menu items: DIAGNOSIS/EN-
HANCED OBD II/SYSTEM CHECK/AIR INJ CHECK/
MANUAL OPERATION/OPERATION 1 and 4
HINT:
OPERATION 1: AP:OFF, EASV:CLOSE, ASV1:CLOSE,
ASV2:CLOSE
OPERATION 4: AP:OFF, EASV:OPEN, ASV1:CLOSE,
ASV2:CLOSE
NOTICE:
This test only allows technicians to operate the AI system
for 5 seconds. Furthermore, the test can be performed 4
times a trip. If the test is repeated, intervals of at least 30
seconds are required between tests.
While the AI system operation using the hand±held tester
is prohibited, the tester displays the prohibition (WAIT or
ERROR). If the ERROR (AI STATUS NG) is displayed on the
tester, stop the engine for 10 minutes and then try again..
OK:
Standard:
Tester operationTester ConnectionSpecified Condition
Operation 4A46±1 ± Body ground10 V or more
Operation 1A46±1 ± Body groundBelow 1.0 V
NG Go to step 12.
OK