2001 TOYOTA SEQUOIA relay
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DI±62
± DIAGNOSTICSENGINE
256 Author: Date:
2005 SEQUOIA (RM1146U)P0230
(DI±179)
Fuel Pump Primary Circuit
Open or short in fuel pump relay circuit
Fuel pump relay
Circuit opening relay
Fuel pump
ECM
±
P0300
(DI±184)Random/Multiple Cylinder Misfire
Detected
Open or short in engine wire
Connector connection
Vacuum hose connection
Ignition system
Injector
Fuel pressure
Mass air flow meter
Engine coolant temperature sensor
Compression pressure
Valve clearance
Valve timing
PCV piping
ECM
*2
P0301
(DI±184)Cylinder 1 Misfire Detected
Open or short in engine wire
Connector connection
Vacuum hose connection
Ignition system
Injector
Fuel pressure
Mass air flow meter
Engine coolant temperature sensor
Compression pressure
Valve clearance
Valve timing
PCV piping
ECM
*2
P0302
(DI±184)Cylinder 2 Misfire Detected
Open or short in engine wire
Connector connection
Vacuum hose connection
Ignition system
Injector
Fuel pressure
Mass air flow meter
Engine coolant temperature sensor
Compression pressure
Valve clearance
Valve timing
PCV piping
ECM
*2
P0303
(DI±184)Cylinder 3 Misfire Detected
Open or short in engine wire
Connector connection
Vacuum hose connection
Ignition system
Injector
Fuel pressure
Mass air flow meter
Engine coolant temperature sensor
Compression pressure
Valve clearance
Valve timing
PCV piping
ECM
*2
Page 261 of 4323
± DIAGNOSTICSENGINE
DI±67
261 Author: Date:
2005 SEQUOIA (RM1146U)P0617
(DI±298)
Starter Relay Circuit High
Park/neutral position switch
Starter relay circuit
Ignition switch
ECM
P0630
(DI±302)VIN not Programmed or Mis-
match±ECM/PCMECM
P0657
(DI±296)Actuator Supply Voltage Circuit/
OpenECM
P0705
(DI±576)Transmission Range Sensor Cir-
cuit Malfunction (PRNDL Input)Electronic Controlled Automatic Transaxle (ECT)
P0710
(DI±582)Transmission Fluid Temperature
Sensor ºAº CircuitElectronic control automatic transmission (ECT)
P0711
(DI±588)Transmission Fluid Temperature
Sensor ºAº PerformanceElectronic control automatic transmission (ECT)
P0712
(DI±582)Transmission Fluid Temperature
Sensor ºAº Circuit Low InputElectronic control automatic transmission (ECT)
P0713
(DI±582)Transmission Fluid Temperature
Sensor ºAº Circuit High InputElectronic control automatic transmission (ECT)
P0717
(DI±591)Input/Turbine Speed Sensor ºAº
Circuit No SignalElectronic control automatic transmission (ECT)
P0722
(DI±596)Output Speed Sensor Circuit No
SignalElectronic control automatic transmission (ECT)
P0724
(DI±600)Brake Switch ºBº Circuit HighElectronic control automatic transmission (ECT)
P0748
(DI±603)Pressure Control Solenoid ºAº
Electrical (Shift Solenoid Valve
SL1)
Electronic control automatic transmission (ECT)
P0751
(DI±608)Shift Solenoid ºAº Performance
(Shift Solenoid Valve S1)Electronic control automatic transmission (ECT)
P0756
(DI±614)Shift Solenoid ºBº Performance
(Shift Solenoid Valve S2)Electronic control automatic transmission (ECT)
P0771
(DI±620)Shift Solenoid ºEº Performance
(Shift Solenoid Valve SR)Electronic control automatic transmission (ECT)
P0776
(DI±625)Pressure Control Solenoid ºBº
Performance (Shift Solenoid
Valve SL2)
Electronic control automatic transmission (ECT)
P0778
(DI±631)Pressure Control Solenoid ºBº
Electrical (Shift Solenoid Valve
SL2)
Electronic control automatic transmission (ECT)
P0781
(DI±636)1±2 Shift (1±2 Shift Valve)Electronic control automatic transmission (ECT)
P0973
(DI±641)Shift Solenoid ºAº Control Circuit
Low (Shift solenoid Valve S1)Electronic control automatic transmission (ECT)
P0974
(DI±641)Shift Solenoid ºAº Control Circuit
High (Shift solenoid Valve S1)Electronic control automatic transmission (ECT)
P0976
(DI±646)Shift Solenoid ºBº Control Circuit
Low (Shift solenoid Valve S2)Electronic control automatic transmission (ECT)
P0977
(DI±646)Shift Solenoid ºBº Control Circuit
High (Shift solenoid Valve S2)Electronic control automatic transmission (ECT)
P0985
(DI±651)Shift Solenoid ºEº Control Circuit
Low (Shift Solenoid Valve SR)Electronic control automatic transmission (ECT)
Page 263 of 4323
± DIAGNOSTICSENGINE
DI±69
263 Author: Date:
2005 SEQUOIA (RM1146U)P2112
(DI±358)
Throttle Actuator Control System
± Stuck Closed
Throttle control motor and sensor circuit
Throttle control motor and sensor
Throttle valve
Throttle body
P2118
(DI±362)Throttle Actuator Control Motor
Current Range/PerformanceOpen in throttle control motor and sensor power source circuit
ETCS fuse
ECM
P2119
(DI±367)Throttle Actuator Control Throttle
Body Range/PerformanceElectric throttle control system
Throttle body
P2120
(DI±370)Throttle/Pedal Position Sensor/
Switch ºDº CircuitAccelerator pedal position sensor
ECM
P2121
(DI±380)Throttle/Pedal Position Sensor/
Switch ºDº Circuit Range/Perfor-
mance
Accelerator pedal position sensor
P2122
(DI±370)Throttle/Pedal Position Sensor/
Switch ºDº Circuit Low Input
Accelerator pedal position sensor
VCPA circuit open
VPA circuit open or ground short
ECM
P2123
(DI±370)Throttle/Pedal Position Sensor/
Switch ºDº Circuit High InputAccelerator pedal position sensor
EPA circuit open
ECM
P2125
(DI±370)Throttle/Pedal Position Sensor/
Switch ºEº CircuitAccelerator pedal position sensor
ECM
P2127
(DI±370)Throttle/Pedal Position Sensor/
Switch ºEº Circuit Low Input
Accelerator pedal position sensor
VCP2 circuit open
VPA2 circuit open or ground short
ECM
P2128
(DI±370)Throttle/Pedal Position Sensor/
Switch ºEº Circuit High InputAccelerator pedal position sensor
EPA circuit open
ECM
P2135
(DI±127)Throttle Pedal Position Sensor/
Switch ºAº / ºBº Voltage Correla-
tionThrottle control motor and sensor
VTA1 and VTA2 circuit are short±circuited
ECM
P2138
(DI±370)Throttle Pedal Position Sensor/
Switch ºDº / ºEº Voltage Correla-
tionVPA and VPA2 circuit are short circuited
Accelerator pedal position sensor
ECM
P2195
(DI±383)Oxygen (A/F) Sensor Signal
Stuck Lean (Bank 1 Sensor 1)
Open or short in A/F sensor (sensor 1) circuit
A/F sensor (sensor 1)
A/F sensor heater (sensor 1)
A/F relay
A/F sensor heater and EFI relay circuits
Air induction system
Fuel pressure
Injector
ECM
P2196
(DI±383)Oxygen (A/F) Sensor Signal
Stuck Rich (Bank 1 Sensor 1)
Open or short in A/F sensor (sensor 1) circuit
A/F sensor (sensor 1)
A/F sensor heater (sensor 1)
A/F relay
A/F sensor heater and EFI relay circuits
Air induction system
Fuel pressure
Injector
ECM
Page 264 of 4323
DI±70
± DIAGNOSTICSENGINE
264 Author: Date:
2005 SEQUOIA (RM1146U)P2197
(DI±383)
Oxygen (A/F) Sensor Signal
Stuck Lean (Bank 2 Sensor 1)
Open or short in A/F sensor (sensor 1) circuit
A/F sensor (sensor 1)
A/F sensor heater (sensor 1)
A/F relay
A/F sensor heater and EFI relay circuits
Air induction system
Fuel pressure
Injector
ECM
P2198
(DI±383)Oxygen (A/F) Sensor Signal
Stuck Rich (Bank 2 Sensor 1)
Open or short in A/F sensor (sensor 1) circuit
A/F sensor (sensor 1)
A/F sensor heater (sensor 1)
A/F relay
A/F sensor heater and EFI relay circuits
Air induction system
Fuel pressure
Injector
ECM
P2238
(DI±402)Oxygen Sensor Pumping Cur-
rent Circuit Low (For A/F Sensor)
(Bank 1 Sensor 1)
Open or short in A/F sensor (sensor 1) circuit
A/F sensor (sensor 1)
A/F sensor heater (sensor 1)
A/F relay
A/F sensor heater and EFI relay circuits
P2239
(DI±402)Oxygen Sensor Pumping Cur-
rent Circuit High (For A/F Sen-
sor) (Bank 1 Sensor 1)
Open or short in A/F sensor (sensor 1) circuit
A/F sensor (sensor 1)
A/F sensor heater (sensor 1)
A/F relay
A/F sensor heater and EFI relay circuits
P2241
(DI±402)Oxygen Sensor Pumping Cur-
rent Circuit Low (For A/F Sensor)
(Bank 2 Sensor 1)
Open or short in A/F sensor (sensor 1) circuit
A/F sensor (sensor 1)
A/F sensor heater (sensor 1)
A/F relay
A/F sensor heater and EFI relay circuits
P2242
(DI±402)Oxygen Sensor Pumping Cur-
rent Circuit High (For A/F Sen-
sor) (Bank 2 Sensor 1)
Open or short in A/F sensor (sensor 1) circuit
A/F sensor (sensor 1)
A/F sensor heater (sensor 1)
A/F relay
A/F sensor heater and EFI relay circuits
P2252
(DI±402)Oxygen Sensor Reference
Ground Current Circuit Low (For
A/F Sensor) (Bank 1 Sensor 1)
Open or short in A/F sensor (sensor 1) circuit
A/F sensor (sensor 1)
A/F sensor heater (sensor 1)
A/F relay
A/F sensor heater and EFI relay circuits
P2253
(DI±402)Oxygen Sensor Reference Cur-
rent Circuit High (For A/F Sen-
sor) (Bank 1 Sensor 1)
Open or short in A/F sensor (sensor 1) circuit
A/F sensor (sensor 1)
A/F sensor heater (sensor 1)
A/F relay
A/F sensor heater and EFI relay circuits
P2255
(DI±402)Oxygen Sensor Reference
Ground Current Circuit Low (For
A/F Sensor) (Bank 2 Sensor 1)
Open or short in A/F sensor (sensor 1) circuit
A/F sensor (sensor 1)
A/F sensor heater (sensor 1)
A/F relay
A/F sensor heater and EFI relay circuits
P2256
(DI±402)Oxygen Sensor Reference Cur-
rent Circuit High (For A/F Sen-
sor) (Bank 2 Sensor 1)
Open or short in A/F sensor (sensor 1) circuit
A/F sensor (sensor 1)
A/F sensor heater (sensor 1)
A/F relay
A/F sensor heater and EFI relay circuits
Page 282 of 4323
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±88
± DIAGNOSTICSENGINE
282 Author: Date:
2005 SEQUOIA (RM1146U)
DTC P0031 Oxygen (A/F) Sensor Heater Control Circuit
Low (Bank 1 Sensor 1)
DTC P0032 Oxygen (A/F) Sensor Heater Control Circuit
High (Bank 1 Sensor 1)
DTC P0051 Oxygen (A/F) Sensor Heater Control Circuit
Low (Bank 2 Sensor 1)
DTC P0052 Oxygen (A/F) Sensor Heater Control Circuit
High (Bank 2 Sensor 1)
HINT:
Although each DTC title (DTC description) says ºoxygen sensorº, these DTCs are related to the ºA/F sensorº.
CIRCUIT DESCRIPTION
Refer to DTC P2195 on page DI±383.
HINT:
The ECM provides a pulse width modulated control circuit to adjust current through the heater. The A/F sen-
sor heater circuit uses a relay on the B+ side of the circuit.
DTC No.DTC Detection ConditionTrouble Area
P0031
P0051Heated current is 0.8 A or less when heater operates
(1 trip detection logic)Open or short in heater circuit of A/F sensor
A/F sensor heater
P0032
P0052When the heater operates, heated current exceeds 19.7 A
(1 trip detection logic)
A/F sensor heater
A/F sensor heater relay
ECM
DIDFP±01
Page 285 of 4323
A19288
B17411
HA1A
E7HA2A
± DIAGNOSTICSENGINE
DI±91
285 Author: Date:
2005 SEQUOIA (RM1146U)
2 Check A/F relay.
PREPARATION:
Remove the A/F relay from the engine room R/B No.2.
CHECK:
Inspect the A/F relay.
OK:
Standard:
Terminal No.ConditionSpecified Condition
3 ± 5Always10 KW or higher
3 ± 5Apply B+ between
terminals 1 and 2Below 1 W
NG Replace A/F relay.
OK
3 Check voltage between terminals HA1A, HA2A of ECM connectors and body
ground.
PREPARATION:
Turn the ignition switch ON.
CHECK:
Measure the voltage between terminals of the ECM connectors
and body ground.
HINT:
Connect terminal HA1A to the bank 1 sensor 1.
Connect terminal HA2A to the bank 2 sensor 1.
OK:
Standard:
Tester ConnectionSpecified Condition
HA1A (E7±2) ± Body ground9 V to 14 V
HA2A (E7±1) ± Body ground9 V to 14 V
OK Replace ECM (See page SF±80).
NG
Page 286 of 4323
A23659
Wire Harness Side:
HT
A38
Sensor 1A/F Sensor Connector
Front View
+B A39
B17415
E7ECM Connector
HA1A
HA2A
H24253
A/F Relay
Engine Room R/B No.2:
DI±92
± DIAGNOSTICSENGINE
286 Author: Date:
2005 SEQUOIA (RM1146U)
4 Check for open and short in harness and connector between ECM and A/F sen-
sor.
PREPARATION:
(a) Turn the ignition switch to OFF.
(b) Disconnect the A38 or A39 A/F sensor connector.
(c) Disconnect the E7 ECM connector.
CHECK:
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
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
PREPARATION:
(a) Turn the ignition switch to OFF.
(b) Disconnect the A38 or A39 A/F sensor connector.
(c) Remove A/F relay from engine room R/B No.2.
CHECK:
Check the resistance.
OK:
Standard (Check for open):
Tester ConnectionsSpecified Conditions
+B (A38±2) ± A/F relay (3)
+B (A39±2) ± A/F relay (3)Below 1 W
Standard (Check for short):
Tester ConnectionsSpecified Conditions
+B (A38±2) or A/F relay (3) ± Body ground
+B (A39±2) or A/F relay (3) ± Body ground10 kW or higher
NG Repair or replace harness or connector.
OK
Check for intermittent problems
(See page DI±11).
Page 288 of 4323
B17386
Housing
Solid Electrolyte
(Zirconia Element)
Platinum Electrode
Heater
Coating (Ceramic)
Exhaust Gas CoverIdeal Air±Fuel Mixture
Output Voltage
Richer ± Air Fuel Ratio ± Leaner
Atmospheric Air
A21040
Reference(Bank 1 Sensor 1 System Drawing) :
ECM
EFI Relay
EFI Fuse No. 1 From
Battery
GroundOX1A
MREL HT1A
Duty
Control Heater
Sensor Heated Oxygen Sensor
EFI Fuse No. 2
E2 DI±94
± DIAGNOSTICSENGINE
288 Author: Date:
2005 SEQUOIA (RM1146U)
CIRCUIT DESCRIPTION
To obtain a high purification rate for the CO, HC and NOx components of the exhaust gas, a three±way cata-
lytic converter is used, but for the most efficient use of the three±way catalytic converter, the air±fuel ratio
must be precisely controlled so that it is always close to the stoichiometric air±fuel ratio.
The heated oxygen sensor has the characteristic which its output voltage changes suddenly in the vicinity
of the stoichiometric air±fuel ratio. This characteristic is used to detect the oxygen concentration in the ex-
haust gas and provide the ECM with feedback to control the air±fuel ratio.
When the air±fuel ratio becomes LEAN, the oxygen concentration in the exhaust increases and the heated
oxygen sensor informs the ECM of the LEAN condition (low voltage, i.e. less than 0.45 V).
When the air±fuel ratio is RICHER than the stoichiometric air±fuel ratio, the oxygen concentration in the ex-
haust gas is reduced and the heated oxygen sensor informs the ECM of the RICH condition (high voltage,
i.e. more than 0.45 V). The ECM judges by the voltage output from the heated oxygen sensor whether the
air±fuel ratio is RICH or LEAN and controls the injection time accordingly. However, if malfunction of the
heated oxygen sensor causes output of abnormal voltage, this disables the ECM for performing an accurate
air±fuel ratio control. The heated oxygen sensors include a heater which heats the zirconia element. The
heater is controlled by the ECM. When the intake air volume is low (the temperature of the exhaust gas is
low) current flows to the heater to heat the sensor for accurate oxygen concentration detection.
HINT:
The ECM provides a pulse width modulated control circuit to adjust current through the heater. The heated
oxygen sensor heater circuit uses a relay on the B+ side of the circuit.