2001 TOYOTA SEQUOIA terminal TC

DI±404
± DIAGNOSTICSENGINE
598 Author: Date:
2005 SEQUOIA (RM1146U)
MONITOR STRATEGY
A/F sensor (Bank 1) open circuit between AF+
and AF±
P2238A/F sensor (Bank 1) short circuit between AF+
and AF±
A/F sensor (Bank 1) short circuit between AF+
and GND
P2239A/F sensor (Bank 1) short circuit between AF+
and +B
A/F sensor (Bank 2) open circuit between AF+
and AF±
RltdDTC
P2241A/F sensor (Bank 2) short circuit between AF+
and AF±
Related DTCsA/F sensor (Bank 2) short circuit between AF+
and GND
P2242A/F sensor (Bank 2) short circuit between AF+
and +B
P2252A/F sensor (Bank 1) short circuit between AF±
and GND
P2253A/F sensor (Bank 1) short circuit between AF±
and +B
P2255A/F sensor (Bank 2) short circuit between AF±
and GND
P2256A/F sensor (Bank 2) short circuit between AF±
and +B
Required sensors/componentsA/F sensor
Frequency of operationOnce per driving cycle
Duration10 sec.: A/F sensor open circuit between AF+ and AF±
5 sec.: Others
MIL operationImmediate
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
The monitor will run whenever these
DTCs are not presentSee page DI±18
P2238, P2241 (A/F sensor open circuit between AF+ and AF±):
Duration while all of following conditions
met20 sec.±
AF+ terminal voltage0.5 to 4.5 V
AF± terminal voltage0.5 to 4.5 V
Difference between AF+ terminal and AF±
terminal voltage0.1 to 0.8 V
ECT20°C (68°F)±
EngineRunning
Time after engine start20 sec.±
Fuel±cutOFF
A/F sensor heater duty cycle0%±

± DIAGNOSTICSENGINE
DI±405
599 Author: Date:
2005 SEQUOIA (RM1146U) Time after A/F sensor heating
20 sec.±
Battery voltage10.5 V±
Ignition switchON
Others:
Battery voltage10.5 V±
Ignition switchON
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
P2238, P2241 (A/F sensor open circuit between AF+ and AF±):
A/F sensor admittanceBellow 0.022 1/ohm
P2238, P2241 (A/F sensor short circuit between AF+ and GND):
A/F+ terminal voltage0.5 V or less
P2238, P2241 (A/F sensor short circuit between AF+ and AF±):
Difference between A/F+ terminal and AF± terminal voltage0.1 V or less
P2239, P2242 (A/F sensor short circuit between AF+ and +B):
A/F+ terminal voltageMore than 4.5 V
P2252, P2255 (A/F sensor short circuit between AF± and GND):
A/F± terminal voltage0.5 V or less
P2253, P225+ (A/F sensor short circuit between AF± and +B):
A/F± terminal voltageMore than 4.5 V
WIRING DIAGRAM
Refer to DTC P2195 on page DI±383.
INSPECTION PROCEDURE
HINT:
Hand±held tester only:
Malfunctioning areas can be identified by performing the A/F CONTROL function provided in the ACTIVE
TEST. The A/F CONTROL function can help to determine whether the Air±Fuel Ratio (A/F) sensor, Heated
Oxygen (HO2) sensor and other potential trouble areas are malfunctioning.
The following instructions describe how to conduct the A/F CONTROL operation using a hand±held tester.
(1) Connect a hand±held tester to the DLC3.
(2) Start the engine and turn the tester ON.
(3) Warm up the engine at an engine speed of 2,500 rpm for approximately 90 seconds.
(4) On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / ACTIVE
TEST / A/F CONTROL.
(5) Perform the A/F CONTROL operation with the engine in an idling condition (press the RIGHT
or LEFT button to change the fuel injection volume).
(6) Monitor the voltage outputs of the A/F and HO2 sensors (AFS B1S1 (AFS B2S1) and OS2 B1S2
(O2S B2S2)) displayed on the tester.
HINT:

The A/F CONTROL operation lowers the fuel injection volume by 12.5 % or increases the injection
volume by 25 %.

Each sensor reacts in accordance with increases and decreases in the fuel injection volume.

B17396
HT +B
AF± AF+ Sensor 1A/F Sensor Component Side:
Front View
A19288
± DIAGNOSTICSENGINE
DI±407
601 Author: Date:
2005 SEQUOIA (RM1146U)
HINT:
Read freeze frame data using a hand±held tester. Freeze frame data record the engine condition when mal-
functions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was mov-
ing 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 resistance of air±fuel ratio (A/F) sensor heater.
PREPARATION:
Disconnect the air±fuel ratio (A/F) sensor connector.
CHECK:
Measure resistance between the terminals of the A/F sensor
connector.
OK:
Tester ConnectionSpecified Condition
HT (1) ± +B (2)Between 1.8 W and 3.4 W at 20C (68F)
HT (1) ± AF± (4)10 kW or higher
NG Replace air±fuel ratio (A/F) sensor.
OK
2 Check A/F relay.
PREPARATION:
Remove the A/F relay from the engine room J/B.
CHECK:
Inspect the A/F relay.
OK:
Terminal No.ConditionSpecified Condition
1 ± 2ConstantContinuity
UsuallyNo Continuity
3 ± 5Apply B+ between
terminals 1 and 2Continuity
NG Replace EFI relay.
OK

A23659
Wire Harness Side:
HT
A38
Sensor 1A/F Sensor Connector
AF+
Front ViewAF±
+B A39
B17415A55007
E7ECM Connector
HA1A
A1A+
A1A±
A2A+
A2A±HA2A
A23512
Reference (Bank 1 Sensor 1 System Drawing):
A/F Sensor A/F Relay
Heater
Sensor
A1A+ HA1A
Duty
Control ECM
From
Battery
A/F Heater
Fuse
A1A±
To EFI Relay DI±408
± DIAGNOSTICSENGINE
602 Author: Date:
2005 SEQUOIA (RM1146U)
3 Check for open and short in harness and connector between ECM and A/F sen-
sor.
PREPARATION:
(a) Disconnect the A38 or A39 A/F sensor connector.
(b) Turn the ignition switch to ON.
CHECK:
(a) Measure the voltage between the +B terminal of the A/F
sensor connector and body ground.
OK:
Standard:
Tester ConnectionsSpecified Conditions
+B (2) ± Body groundBetween 9 V and 14 V
PREPARATION:
(a) Turn the ignition switch to OFF.
(b) Disconnect the E7 ECM connector.
CHECK:
(a) Check the resistance.
OK:
Standard (Check for open):
Tester ConnectionsSpecified Conditions
HT (A38±1) ± HA1A (E7±2)
HT (A39±1) ± HA2A (E7±1)Below 1 W
AF+ (A38±3) ± A1A+ (E7±22)
AF+ (A39±3) ± A2A+ (E7±23)Below 1 W
AF± (A38±4) ± A1A± (E7±30)
AF± (A39±4) ± A2A± (E7±31)Below 1 W
Standard (Check for short):
Tester ConnectionsSpecified Conditions
HT (A38±1) or HA1A (E7±2) ± Body ground
HT (A39±1) or HA2A (E7±1) ± Body ground10 kW or higher
AF+ (A38±3) or A1A+ (E7±22) ± Body ground
AF+ (A39±3) or A2A+ (E7±23) ± Body ground10 kW or higher
AF± (A38±4) or A1A± (E7±30) ± Body ground
AF± (A39±4) or A2A± (E7±31) ± Body ground10 kW or higher

B17444
Wire Harness Side:
Air Injection Driver Connector
A41
+B
E
B17443
Wire Harness Side:
Air Injection Driver Connector
A40
BATT
DI±434
± DIAGNOSTICSENGINE
628 Author: Date:
2005 SEQUOIA (RM1146U)
7 Inspect air injection driver power source circuit.
PREPARATION:
(a) Remove the intake manifold (see page EM±36).
(b) Disconnect the A40 and A41 air injection driver connec-
tors.
(c) Turn the ignition switch to ON.
CHECK:
Measure the voltage between terminals A41±5 (+B) and A40±1
(BATT) of the air injection driver and body ground.
OK:
Standard:
Tester ConnectionSpecified Condition
A41±5 (+B) ± Body ground10 V or more
A40±1 (BATT) ± Body ground10 V or more
CHECK:
Measure the resistance between terminal A41±1 (E) of the air
injection driver and body ground.
OK:
Standard:
Tester ConnectionSpecified Condition
A41±1 (E) ± Body groundBelow 1 W
NG Repair or replace harness or connector.
OK

B17411
E4
AIRVAIRP
± DIAGNOSTICSENGINE
DI±435
629 Author: Date:
2005 SEQUOIA (RM1146U)
8 Check voltage between AIRP and AIRV terminal of ECM and body ground.
PREPARATION:
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch ON and turn the tester ON.
CHECK:
(a) When the air pump and air switching valve are operated
using the hand±held tester, measure the voltage between
terminals E4±25 (AIRP) and E4±4 (AIRV) of the air injec-
tion 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 2
HINT:
OPERATION 1: AP:OFF, EASV:CLOSE, ASV1:CLOSE,
ASV2:CLOSE
OPERATION 2: 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:
Air pump operationTester ConnectionSpecified Condition
ONE4±25 (AIRP) ±
Body ground10 V or more
OFFE4±25 (AIRP) ±
Body ground3.5 to 7.7 V*
ASV operation (EASV)Tester ConnectionSpecified Condition
OPENE4±4 (AIRV) ±
Body ground10 V or more
CLOSEE4±4 (AIRV) ±
Body ground3.5 to 7.7 V*
*: 35 to 55 % of the +B voltage.
NG Replace ECM (See page SF±80).
OK

B17444
Wire Harness Side:
Air Injection Driver Connector
A41
SIPSIV
DI±436
± DIAGNOSTICSENGINE
630 Author: Date:
2005 SEQUOIA (RM1146U)
9 Check voltage between SIV and SIP terminals of air injection driver and body
ground.
PREPARATION:
(a) Disconnect the A41 air injection driver connector.
(b) Connect the hand±held tester to the DLC3.
(c) Turn the ignition switch ON and turn the tester ON.
CHECK:
(a) When the air pump and air switching valve are operated
using the hand±held tester, measure the voltage between
terminals A41±3 (SIV) and A41±4 (SIP) 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 2
HINT:
OPERATION 1: AP:OFF, EASV:CLOSE, ASV1:CLOSE,
ASV2:CLOSE
OPERATION 2: 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:
Air pump operationTester ConnectionSpecified Condition
ONA41±3 (SIP) ± Body
ground10 V or more
OFFA41±3 (SIP) ± Body
ground3.5 to 7.7 V*
ASV operation (EASV)Tester ConnectionSpecified Condition
OPENA41±4 (SIV) ± Body
ground10 V or more
CLOSEA41±4 (SIV) ± Body
ground3.5 to 7.7 V*
*: 35 to 55 % of the +B voltage.
NG Repair or replace harness or connector be-
tween air injection driver and ECM.
OK

B17438
Wire Harness Side:
Air Pump Connector
A43
± DIAGNOSTICSENGINE
DI±437
631 Author: Date:
2005 SEQUOIA (RM1146U)
10 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 2
HINT:
OPERATION 1: AP:OFF, EASV:CLOSE, ASV1:CLOSE,
ASV2:CLOSE
OPERATION 2: 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:
Air pump operationTester ConnectionSpecified Condition
ONA43±2 ± Body ground10 V or more
OFFA43±2 ± Body groundBelow 1.0 V
NG Go to step 14.
OK