TOYOTA HIGHLANDER 2001 Service Repair Manual
Page 1811 of 2572
- DIAGNOSTICSSFI SYSTEM (3MZ-FE)
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779 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
1 CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P0505)
(a) Read the DTC using the hand-held tester or the OBD II scan tool.
Result:
Display (DTC Output)Proceed to
Only P0505 is outputA
P0505 and other DTCs are outputB
HINT:
If any other codes besides P0505 are output, perform the troubleshooting for those codes first.
B GO TO RELEVANT DTC CHART
(See page 05-412)
A
2 CHECK CONNECTION OF PCV HOSE
OK: PCV hose is connected correctly. And PCV hose has no damage.
NG REPAIR OR REPLACE PCV HOSE
OK
3 CHECK AIR INDUCTION SYSTEM
(a) Check for vacuum leaks in air induction system.
OK: No leak in air induction system.
NG REPAIR OR REPLACE AIR INDUCTION SYSTEM
OK
CHECK ELECTRONIC THROTTLE CONTROL SYSTEM (See page 10-12)
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A82389
Idle Engine
RPM
Small Target RPM
Actual Idle RPMLarge
Learning Value
of the Idle Speed
ControlMaximum
Minimum
Time 0
Time 05-226
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
416 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC P0505 IDLE AIR CONTROL SYSTEM
MONITOR DESCRIPTION
The idle speed is controlled by the Electronic Throttle Control System (ETCS).
The ETCS is composed of the throttle motor, which operates the throttle valve, and the throttle position sen-
sor, which detects the opening angle of the throttle valve.
The ECM controls the throttle motor to provide the proper throttle valve opening angle to obtain the target
idle speed.
The ECM regulates the idle speed by opening and closing the throttle valve using the ETCS. The ECM con-
cludes that the idle speed control ECM function is malfunctioning if: 1) the actual idle RPM varies more than
the specified amount five times or more during a drive cycle, or 2) a learning value of the idle speed control
remains at the maximum or minimum five times or more during a drive cycle. The ECM will turn on the MIL
and set a DTC.
Example:
If the actual idle RPM varies from the target idle RPM by more than 200*
1 rpm five times during a drive cycle,
the ECM will turn on the MIL and will set a DTC.
*
1: RPM threshold varies with engine load.
DTC No.DTC Detection ConditionTrouble Area
P0505Idle speed continues to vary greatly from target speed
Electronic throttle control system
Air induction system
PCV hose connection
05EVL-05
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MONITOR STRATEGY
Related DTCsIAC Functional Check
Required sensors / components (Main)ETCS (Electrical throttle control system)
Required sensors / components (Related)CKP sensor, ECT sensor, and VSS
Frequency of operationContinuous
Duration10 min.
MIL operation2 driving cycles
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
The monitor will run whenever this DTC is not presentSee page 05-16
EngineRunning
TYPICAL MALFUNCTION THRESHOLDS
Either of the Conditions is met:Condition 1 or 2
1. Frequency that both of the following conditions (a) and (b)
are met:5 times
(a) Engine RPM - Target engine RPMLess than -100 rpm or more than 150 rpm
(b) Vehicle conditionStop after vehicle was driven at 10 km/h (6.25 mph) or more
2. Frequency that both of the following conditions (a) and (b)
are met:Once
(a) IAC flow rate learning valueBelow 1.3 L/second or above 4.51 L/second
(b) Engine RPM - Target engine RPMLess than -100 rpm or more than 150 rpm
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.
Page 1814 of 2572
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- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
418 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
1 CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P0505)
(a) Read the DTC using the hand-held tester or the OBD II scan tool.
Result:
Display (DTC Output)Proceed to
Only P0505 is outputA
P0505 and other DTCs are outputB
HINT:
If any other codes besides P0505 are output, perform the troubleshooting for those codes first.
B GO TO RELEVANT DTC CHART
(See page 05-48)
A
2 CHECK CONNECTION OF PCV HOSE
OK: PCV hose is connected correctly and PCV hose has no damage.
NG REPAIR OR REPLACE PCV HOSE
OK
3 CHECK AIR INDUCTION SYSTEM
(a) Check for vacuum leaks in the air induction system.
OK: No leak in air induction system.
NG REPAIR OR REPLACE AIR INDUCTION SYSTEM
OK
CHECK ELECTRIC THROTTLE CONTROL SYSTEM (See page 10-1)
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- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
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DTC P0560 SYSTEM VOLTAGE
MONITOR DESCRIPTION
The battery supplies electricity to the ECM even when the ignition switch is OFF. This electricity allows the
ECM to store data such as DTC history, freeze frame data, fuel trim values and other data. If the battery
voltage falls below a minimum level, the ECM will conclude that there is a fault in the power supply circuit.
The next time the engine starts, the ECM will turn on the MIL and a DTC will be set.
DTC No.DTC Detection ConditionTrouble Area
P0560Open in ECM back-up power source circuit
(1 trip detection logic)Open in back-up power source circuit
ECM
HINT:
If DTC P0560 is present, the ECM will not store other DTCs.
MONITOR STRATEGY
Related DTCsP0560: ECM system voltage
Required sensors / components (Main)ECM
Required sensors / components (Related)-
Frequency of operationContinuous
Duration3 sec.
MIL operationImmediate (MIL will illuminate after the next engine start)
Sequence operationNone
TYPICAL ENABLING CONDITIONS
The monitor will run whenever this DTC is not presentSee page 05-16
TYPICAL MALFUNCTION THRESHOLDS
ECM power sourceLess than 3.5 V
05EVM-05
Page 1816 of 2572
A90302
BATTECM
F7
FL Block Assy 32IEFI NO. 13
E5
11
BR
Battery1
E9
FL
MainE1 BR
A
A
BR
EE WEngine Room J/B
J7
J/C W
2B7
IK211
B-W
A90343EFI NO. 1 fuse Engine Room J/B
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2005 HIGHLANDER REPAIR MANUAL (RM1144U)
WIRING DIAGRAM
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.
1 INSPECT FUSE (EFI NO. 1)
(a) Remove the EFI NO. 1 fuse from the engine room J/B.
(b) Measure the resistance of the EFI NO. 1 fuse.
Standard: Below 1 W
OK REPLACE FUSE
OK
Page 1817 of 2572
A67446
BATT (+)E1 (-)
E5
ECM
E9
ECM
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
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2 INSPECT ECM (BATT VOLTAGE)
(a) Measure the voltage of the ECM connectors.
Standard:
Tester ConnectionSpecified Condition
E5-3 (BATT) - E9-1 (E1)9 to 14 V
OK REPLACE ECM (See page 10-9)
NG
Page 1818 of 2572
Y
A80025
A67445A92625
EFI NO. 1 Fuse
BATTE5
ECM
Engine Room J/B Wire Harness Side
A80025A92626
EFI NO. 1 FuseEngine Room J/B Wire Harness Side
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2005 HIGHLANDER REPAIR MANUAL (RM1144U)
3 CHECK WIRE HARNESS (ECM - EFI NO. 1 FUSE, EFI NO. 1 FUSE - BATTERY)
(a) Check the wire harness between the EFI NO. 1 fuse and
ECM.
(1) Remove the EFI NO. 1 fuse from the engine room
J/B.
(2) Disconnect the E5 ECM connector.
(3) Measure the resistance of the wire harness side
connectors.
Standard:
Tester ConnectionSpecified Condition
J/B EFI NO. 1 fuse terminal 2 - E5-3 (BATT)Below 1 W
J/B EFI NO. 1 fuse terminal 2 or E5-3 (BATT) - Body ground10 kW or higher
(b) Check the wire harness between the EFI NO. 1 fuse and
battery.
(1) Remove the EFI NO. 1 fuse from the engine room
J/B.
(2) Disconnect the battery positive cable.
(3) Measure the resistance of the wire harness side
connectors.
Standard:
Tester ConnectionSpecified Condition
Battery positive cable - J/B EFI NO. 1 fuse terminal 1Below 1 W
Battery positive cable or J/B EFI NO. 1 fuse terminal 1
- Body ground10 kW or higher
NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
CHECK AND REPLACE ENGINE ROOM J/B
Page 1819 of 2572
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
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DTC P0604 INTERNAL CONTROL MODULE RANDOM
ACCESS MEMORY (RAM) ERROR
DTC P0606 ECM/PCM PROCESSOR
DTC P0607 CONTROL MODULE PERFORMANCE
DTC P0657 ACTUATOR SUPPLY VOLTAGE
CIRCUIT/OPEN
MONITOR DESCRIPTION
The ECM continuously monitors its internal memory status, internal circuits, and output signals to the throttle
actuator. This self-check ensures that the ECM is functioning properly. If any malfunction is detected, the
ECM will set the appropriate DTC and illuminate the MIL.
The ECM memory status is diagnosed by internal ºmirroringº of the main CPU and the sub CPU to detect
random access memory (RAM) errors. The two CPUs also perform continuous mutual monitoring. The ECM
sets a DTC if: 1) outputs from the 2 CPUs are different and deviate from the standards, 2) the signals to the
throttle actuator deviate from the standards, 3) a malfunction is found in the throttle actuator supply voltage,
and 4) any other ECM malfunction is found.
DTC No.DTC Detection ConditionTrouble Area
P0604
P0606
P0607
P0657
ECM internal error
(1trip detection logic)ECM
MONITOR STRATEGY
Related DTCs
P0604: RAM errors
P0606: CPU malfunction
P0607: ECM range check
P0657: ETCS (Electrical throttle control) power supply circuit in ECM
Required sensors / components (Main)ECM
Required sensors / components (Related)-
Frequency of operationContinuous
DurationWithin 1 sec.
MIL operationImmediate
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
The monitor will run whenever these DTCs are not presentSee page 05-16
TYPICAL MALFUNCTION THRESHOLDS
RAM Error P0604:
RAMRAM check failure
CPU malfunction P0606:
Either of the following conditions is met:Condition 1 or 2
1. Difference between TP of main CPU and TP of sub CPU0.3 V or more
2. Difference between APP of main CPU and APP of sub
CPU0.3 V or more
05EVN-05
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2005 HIGHLANDER REPAIR MANUAL (RM1144U)
ECM range check P0607:
Either of the following conditions is met:Condition 1 or 2
1. All of the following conditions are met:Conditions (a), (b) and (c)
(a) CPU reset1 time or more
(b) Difference between TP and APP learned0.4 V or more
(c) Electronic throttle actuatorOFF
2. CPU reset2 times or more
ETCS power supply circuit in ECM P0657:
ETCS power supply when ignition switch turns from OFF to
ON7 V or more
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.
REPLACE ECM (See page 10-9)