2001 TOYOTA HIGHLANDER stop start

- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-237
427 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
INSPECTION PROCEDURE
HINT:
Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the
engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help deter-
mine if the vehicle was running or stopped, 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.
Hand-held tester:
1 READ VALUE OF HAND-HELD TESTER (STA SIGNAL)
(a) Connect the hand-held tester to the DLC3.
(b) Turn ON the ignition switch. Push the hand-held tester main switch.
(c) On the hand-held tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST
/ ALL / STARTER SIG. Read the values.
Result:
Ignition Switch ConditionONSTART
STA signalOFFON
OK REPLACE ECM (See page 10-9)
NG
2 INSPECT PARK/NEUTRAL POSITION SWITCH ASSY (See page 05-922)
OK:
When shift lever is in the N position, the PNP switch is ON.
When shift lever is in the P position, the PNP switch is OFF.
NG REPLACE PARK/NEUTRAL POSITION SWITCH
ASSY (See page 40-3) (Go to step 3 AFTER RE-
PLACEMENT)
OK
3 READ VALUE OF HAND-HELD TESTER (STA SIGNAL)
(a) Connect the hand-held tester to the DLC3.
(b) Turn ON the ignition switch. Push the hand-held tester main switch.
(c) On the hand-held tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST
/ ALL / STARTER SIG. Read the values.
Result:
Ignition Switch ConditionONSTART
STA signalOFFON
OK SYSTEM OK
NG

05-242
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
432 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC P0705 TRANSMISSION RANGE SENSOR CIRCUIT
MALFUNCTION (PRNDL INPUT)
CIRCUIT DESCRIPTION
When the shift lever is in the N or P position: 1) the Park/Neutral Position (PNP) switch turns on, and 2) ECM
terminal NSW is grounded to the body ground via the starter relay and voltage becomes 0 V. When the shift
lever is in the D, 2, L or R position: 1) the PNP switch turns off, and 2) ECM terminal NSW receives current
and becomes the voltage of the ECM internal power source.
If the shift lever is moved from the N position to the D position, this signal is used for air-fuel ratio correction
and for idle speed control (estimated control).
DTC No.DTC Detection ConditionTrouble Area
P07052 or more switches are ON simultaneously at R, N, D, 2 and L
positions (2 trip detection logic)
Short in PNP switch circuit

PNP switch

ECM
HINT:
After confirming DTC P0705, use the hand-held tester to confirm the PNP switch signal in the ALL menu
(to reach the ALL menu: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL).
WIRING DIAGRAM
Refer to DTC P0705 on page 05-922.
INSPECTION PROCEDURE
Refer to DTC P0705 on page 05-922.
HINT:
Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the
engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help deter-
mine if the vehicle was running or stopped, 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.
055UU-10

05-940- DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U241E/U140F)
1130 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC P0724 BRAKE SWITCH ºBº CIRCUIT HIGH
CIRCUIT DESCRIPTION
The purpose of this circuit is to prevent the engine from stalling while driving in lock-up condition, when
brakes are suddenly applied.
When the brake pedal is depressed, this switch sends a signals to the ECM. Then the ECM cancels the op-
eration of the lock-up clutch while braking is in progress.
DTC No.DTC Detecting ConditionTrouble Area
P0724
The stop light switch remains ON even when the vehicle is
driven in a GO (30 km/h) and STOP (3 km/h) fashion 5 times.
(2-trip detection logic).
Short in stop light switch signal circuit

Stop light switch

ECM
MONITOR DESCRIPTION
This DTC indicates that the stop light switch remains on. When the stop light switch remains ON during ºstop
and goº driving, the ECM interprets this as a fault in the stop light switch and the MIL comes on and the ECM
stores the DTC. The vehicle must stop (less than 3 km/h (2 mph)) and go (30 km/h (19 mph) or more) 5 times
for two driving cycles in order to detect malfunction.
MONITOR STRATEGY
Related DTCsP0724: Stop light switch/Range check/Rationality
Required sensors/ComponentsStop light switch, Vehicle speed sensor
Frequency of operationContinuous
DurationGO and STOP 5 times
MIL operation2 driving cycles
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
The monitor will run whenever this DTC is not present.See page 05-895
Battery voltage8 V or more
Ignition switchON
StarterOFF
GO (Vehicle speed is 30 km/h (18.63 mph) or more)Once
STOP (Vehicle speed is less than 3 km/h (1.86 mph))Once
TYPICAL MALFUNCTION THRESHOLDS
Brake switchRemain ON during GO and STOP 5 times
05F3C-05

- DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U241E/U140F)05-953
1143 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC P0748 PRESSURE CONTROL SOLENOID ºAº
ELECTRICAL (SHIFT SOLENOID VALVE
SL1)
CIRCUIT DESCRIPTION
Shifting from 1st to O/D is performed in combination with ºONº and ºOFFº operation of the shift solenoid
valves SL1 and SL2 which is controlled by the ECM. If an open or short circuit occurs in either of the shift
solenoid valves, the ECM controls the remaining normal shift solenoid valve to allow the vehicle to be oper-
ated smoothly (Fail safe function).
DTC No.DTC Detection ConditionTrouble Area
P0748
ECM checks for an open or short circuit in shift solenoid valves
SL1 (1-trip detection logic)

Output signal duty equals to 100%
Open or short in shift solenoid valve SL1 circuit

Shift solenoid valve SL1

ECM
MONITOR DESCRIPTION
The ECM commands gear shifts by turning the shift solenoid valves ºON/OFFº. When there is an open or
short circuit in any shift solenoid valve circuit, the ECM detects the problem and illuminates the MIL and
stores the DTC. And the ECM performs the fail-safe function and turns the other shift solenoid valves in good
condition ºON/OFFº (In case of an open or short circuit, the ECM stops sending current to the circuit.)
(see page 05-916).
MONITOR STRATEGY
Related DTCsP0748: Shift solenoid valve SL1/Range check
Required sensors/ComponentsShift solenoid valve SL1
Frequency of operationContinuous
Duration1 sec.
MIL operationImmediate
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
The monitor will run whenever this DTC is not present.See page 05-895
Battery voltage10 V or more
Ignition switchON
StarterOFF
TYPICAL MALFUNCTION THRESHOLDS
Output signal duty100%
COMPONENT OPERATING RANGE
Output signal dutyLess than 100%
05C10-19

05-964- DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U241E/U140F)
1154 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC P0778 PRESSURE CONTROL SOLENOID ºBº
ELECTRICAL (SHIFT SOLENOID VALVE
SL2)
CIRCUIT DESCRIPTION
Shifting from 1st to O/D is performed in combination with ºONº and ºOFFº operation of the shift solenoid
valves SL1 and SL2 which is controlled by the ECM. If an open or short circuit occurs in either of the shift
solenoid valves, the ECM controls the remaining normal shift solenoid valve to allow the vehicle to be oper-
ated smoothly (Fail safe function).
DTC No.DTC Detection ConditionTrouble Area
P0778
ECM checks for an open or short circuit in shift solenoid valves
SL2 (1-trip detection logic)

Output signal duty equals to 100%
Open or short in shift solenoid valve SL2 circuit

Shift solenoid valve SL2

ECM
MONITOR DESCRIPTION
The ECM commands gear shifts by turning the shift solenoid valves ºON/OFFº. When there is an open or
short circuit in any shift solenoid valve circuit, the ECM detects the problem and illuminates the MIL and
stores the DTC. And the ECM performs the fail-safe function and turns the other shift solenoid valves in good
condition ºON/OFFº (In case of an open or short circuit, the ECM stops sending current to the circuit.)
(see page 05-916).
MONITOR STRATEGY
Related DTCsP0778: Shift solenoid valve SL2/Range check
Required sensors/ComponentsShift solenoid valve SL2
Frequency of operationContinuous
Duration1 sec.
MIL operationImmediate
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
The monitor will run whenever this DTC is not present.See page 05-895
Battery voltage10 V or more
Ignition switchON
StarterOFF
TYPICAL MALFUNCTION THRESHOLDS
Output signal duty100%
COMPONENT OPERATING RANGE
Output signal dutyLess than 100%
05C14-17

05-1094- DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U151E/U151F)
1284 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC P0798 PRESSURE CONTROL SOLENOID ºCº
ELECTRICAL (SHIFT SOLENOID VALVE
SL3)
CIRCUIT DESCRIPTION
Shifting from 1st to 5th is performed in combination with ºONº and ºOFFº operation of the shift solenoid valves
SL1, SL2, SL3, S4 and SR which is controlled by the ECM. If an open or short circuit occurs in either of the
shift solenoid valves, the ECM controls the remaining normal shift solenoid valve to allow the vehicle to be
operated smoothly (Fail safe function).
DTC No.DTC Detection ConditionTrouble Area
P0798
ECM checks for an open or short circuit in shift solenoid valves
SL3 (1-trip detection logic)

Output signal duty equals to 100%
Open or short in shift solenoid valve SL3 circuit

Shift solenoid valve SL3

ECM
MONITOR DESCRIPTION
The ECM commands gear shifts by turning the shift solenoid valves ºON/OFFº. When there is an open or
short circuit in any shift solenoid valve circuit, the ECM detects the problem and illuminates the MIL and
stores the DTC. And the ECM performs the fail-safe function and turns the other shift solenoid valves in good
condition ºON/OFFº (In case of an open or short circuit, the ECM stops sending current to the circuit.)
(see page 05-1030).
MONITOR STRATEGY
Related DTCsP0798: Shift solenoid valve SL3/Range check
Required sensors/ComponentsShift solenoid valve SL3
Frequency of operationContinuous
Duration1 sec.
MIL operationImmediate
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
The monitor will run whenever this DTC is not present.See page 05-1007
Battery voltage10 V or more
Ignition switchON
StarterOFF
TYPICAL MALFUNCTION THRESHOLDS
Output signal duty100%
COMPONENT OPERATING RANGE
Output signal dutyLess than 100%
05C16-22

- DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U241E/U140F)05-971
1161 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC P0982 SHIFT SOLENOID ºDº CONTROL CIRCUIT
LOW (SHIFT SOLENOID VALVE S4)
DTC P0983 SHIFT SOLENOID ºDº CONTROL CIRCUIT
HIGH (SHIFT SOLENOID VALVE S4)
CIRCUIT DESCRIPTION
Shifting from 1st to O/D is performed in combination with ºONº and ºOFFº operation of the shift solenoid
valves SL1 and SL2 which is controlled by the ECM. If an open or short circuit occurs in either of the shift
solenoid valves, the ECM controls the remaining normal shift solenoid valve to allow the vehicle to be oper-
ated smoothly (Fail safe function).
DTC No.DTC Detection ConditionTrouble Area
P0982ECM detects short in solenoid valve S4 circuit 2 times when
solenoid valve S4 is operated (1-trip detection logic)
Short in shift solenoid valve S4 circuit

Shift solenoid valve S4

ECM
P0983ECM detects open in solenoid valve S4 circuit 2 times when
solenoid valve S4 is not operated (1-trip detection logic)
Open in shift solenoid valve S4 circuit

Shift solenoid valve S4

ECM
MONITOR DESCRIPTION
The ECM commands gear shifts by turning the shift solenoid valves ºON/OFFº. When there is an open or
short circuit in any shift solenoid valve circuit, the ECM detects the problem and illuminates the MIL and
stores the DTC. And the ECM performs the fail-safe function and turns the other shift solenoid valves in good
condition ºON/OFFº (In case of an open or short circuit, the ECM stops sending current to the circuit.)
(see page 05-916).
MONITOR STRATEGY
Related DTCsP0982: Shift solenoid valve S4/Range check (Low resistance)
P0983: Shift solenoid valve S4/Range check (High resistance)
Required sensors/ComponentsShift solenoid valve S4
Frequency of operationContinuous
Duration0.064 sec.
MIL operationImmediate
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
P0982: Range check (Low resistance)
The monitor will run whenever this DTC is not present.See page 05-895
Shift solenoid valve S4ON
Battery voltage8 V or more
Ignition switchON
StarterOFF
P0983: Range check (High resistance)
The monitor will run whenever this DTC is not present.See page 05-895
Shift solenoid valve S4OFF
Battery voltage8 V or more
Ignition switchON
StarterOFF
05C17-23

05-1 100- DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U151E/U151F)
1290 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC P0985 SHIFT SOLENOID ºEº CONTROL CIRCUIT
LOW (SHIFT SOLENOID VALVE SR)
DTC P0986 SHIFT SOLENOID ºEº CONTROL CIRCUIT
HIGH (SHIFT SOLENOID VALVE SR)
CIRCUIT DESCRIPTION
Shifting from 1st to 5th is performed in combination with ºONº and ºOFFº operation of the shift solenoid valves
SL1, SL2, SL3, S4 and SR which is controlled by the ECM. If an open or short circuit occurs in either of the
shift solenoid valves, the ECM controls the remaining normal shift solenoid valve to allow the vehicle to be
operated smoothly (Fail safe function).
DTC No.DTC Detection ConditionTrouble Area
P0985ECM detects short in solenoid valve SR circuit 2 times when
solenoid valve SR is operated (1-trip detection logic)
Short in shift solenoid valve SR circuit

Shift solenoid valve SR

ECM
P0986ECM detects open in solenoid valve SR circuit 2 times when
solenoid valve SR is not operated (1-trip detection logic)
Open in shift solenoid valve SR circuit

Shift solenoid valve SR

ECM
MONITOR DESCRIPTION
The ECM commands gear shifts by turning the shift solenoid valves ºON/OFFº. When there is an open or
short circuit in any shift solenoid valve circuit, the ECM detects the problem and illuminates the MIL and
stores the DTC. And the ECM performs the fail-safe function and turns the other shift solenoid valves in good
condition ºON/OFFº (In case of an open or short circuit, the ECM stops sending current to the circuit.)
(see page 05-1030).
MONITOR STRATEGY
Related DTCsP0985: Shift solenoid valve SR/Range check (Low resistance)
P0986: Shift solenoid valve SR/Range check (High resistance)
Required sensors/ComponentsShift solenoid valve SR
Frequency of operationContinuous
Duration0.064 sec.
MIL operationImmediate
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
P0985: Range check (Low resistance)
The monitor will run whenever this DTC is not present.See page 05-1007
Shift solenoid valve SRON
Battery voltage8 V or more
Ignition switchON
StarterOFF
P0986: Range check (High resistance)
The monitor will run whenever this DTC is not present.See page 05-1007
Shift solenoid valve SROFF
Battery voltage8 V or more
Ignition switchON
StarterOFF
05C18-12