Page 1337 of 3115

DI-288
- DIAGNOSTICSENGINE
481 Author: Date:
2004 LAND CRUISER (RM1071U) Range check:
Missing output duty change
INSPECTION PROCEDURE
HINT:
When the throttle position is slightly opened (the accelerator pedal is slightly depressed) because a
floor carpet is overlapped on the accelerator pedal, or if not fully releasing the accelerator pedal, etc.,
DTC P0505 will possibly be detected.
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 determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel
ratio was lean or rich, as well as other data from the time when a malfunction occurred.
1 Are there any other codes (besides P0505) being output?
PREPARATION:
(a) Connect the hand-held tester or the OBD II scan tool to the DLC3.
(b) Turn the ignition switch ON and push the hand-held tester or OBD II scan tool main switch ON.
(c) When using hand-held tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC
INFO / CURRENT CODES.
CHECK:
Read the DTC using the hand-held tester or the OBD II scan tool.
RESULT:
Display (DTC Output)Proceed to
P0505A
ºP0505º and other DTCsB
HINT:
If any other codes besides P0505 are output, perform the troubleshooting for those DTCs first.
B Go to relevant DTC chart (See page DI-36).
A
2 Check connection of PCV piping.
NG Repair or replace PCV piping.
OK
Page 1338 of 3115
- DIAGNOSTICSENGINE
DI-289
482 Author: Date:
2004 LAND CRUISER (RM1071U)
3 Check air induction system (See page SF-1).
CHECK:
Check for vacuum leaks in air induction system.
NG Repair or replace air induction system.
OK
Check electric throttle control system
(See page SF-33).
Page 1339 of 3115

DI-290
- DIAGNOSTICSENGINE
483 Author: Date:
2004 LAND CRUISER (RM1071U)
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 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 Detecting ConditionTrouble Area
P0560Open in back up power source circuit
Open in back-up power source circuit
EFI or ECD No.1 fuse
ECM
HINT:
If DTC P0560 present, the ECM will not store another DTC.
MONITOR STRATEGY
Related DTCsP0560System voltage malfunction
Required sensors/componentsECM
Frequency of operationContinuous
Duration3 sec.
MIL operationImmediate (*1)
Sequence of operationNone
*1: The DTC is set immediate. The MIL will be illuminated after the next engine start.
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
The monitor will run whenever the follow-
ing DTCs are not presentSee ºList of disable a monitorº (on page DI-3)
Stand-by RAMInitialized
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
Battery voltageLess than 3.5 V
DIC2M-01
Page 1340 of 3115
A21371
Battery1BB-R
E9ECM
BATT 13
IG1 1
Id15
F15
FL Block 2Engine Room J/B
MAIN
B-G
1CEFI or ECD No. 1
3
B-R B-R
A19976
Engine Room J/B
EFI or ECD No. 1 Fuse
- DIAGNOSTICSENGINE
DI-291
484 Author: Date:
2004 LAND CRUISER (RM1071U)
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, as well as other data from the time when a malfunction occurred.
1 Check EFI or ECD No. 1 fuse of engine room J/B.
PREPARATION:
Remove the EFI or ECD No. 1 fuse from the engine room J/B.
CHECK:
Check the continuity of the EFI or ECD No. 1 fuse.
OK:
Continuity
NG Check for short in all harness and components
connected to EFI or ECD No. 1 fuse.
OK
Page 1341 of 3115
A19521A19629
BATT(+)
ECM Connector E7E9E1 (-)
DI-292
- DIAGNOSTICSENGINE
485 Author: Date:
2004 LAND CRUISER (RM1071U)
2 Check voltage between terminal BATT and E1 of ECM connector.
CHECK:
Measure the voltage between terminals of the E7 and E9 ECM
connector.
OK:
Tester ConnectionSpecified Condition
BATT (E9-3) - E1 (E7-1)9 to 14 V
OK Check for intermittent problems (See page
DI-3).
NG
Page 1342 of 3115

A19976EFI or ECD No. 1 Fuse Engine Room J/B
A21033
E9
BATT
ECM Connector
- DIAGNOSTICSENGINE
DI-293
486 Author: Date:
2004 LAND CRUISER (RM1071U)
3 Check for open and short in harness and connector between ECM and EFI or
ECD No. 1 fuse, EFI or ECD No. 1 fuse and battery.
Check the harness and the connector between the EFI or
ECD No. 1 fuse and the ECM:
PREPARATION:
(a) Remove the EFI or ECD No. 1 fuse from the engine room
J/B.
(b) Disconnect the E9 ECM connector.
CHECK:
Measure the resistance between the wire harness side connec-
tor.
OK:
Tester ConnectionSpecified Condition
Engine Room J/B (EFI or ECD No. 1
fuse terminal 2) -
BATT (E9-3)
Below 1 W
Engine Room J/B (EFI or ECD No. 1
fuse terminal 2) or
BATT (E9-3) - Body ground
10 kW or higher
Check the harness and connector between the EFI or ECD
No. 1 fuse and the battery:
PREPARATION:
(a) Remove the EFI or ECD No. 1 fuse from the engine room
J/B.
(b) Disconnect the battery positive terminal.
CHECK:
Measure the resistance between the wire harness side connec-
tor.
OK:
Tester ConnectionSpecified Condition
Engine Room J/B (EFI or ECD No. 1
fuse terminal 1) -
Battery positive terminal
Below 1 W
Engine Room J/B (EFI or ECD No. 1
fuse terminal 1) or
Battery positive terminal - Body ground
10 kW or higher
NG Repair or replace harness or connector.
OK
Check and replace engine room J/B.
Page 1343 of 3115

DI-294
- DIAGNOSTICSENGINE
487 Author: Date:
2004 LAND CRUISER (RM1071U)
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 insures 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
RAM (Random Access Memory) 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 sig-
nals to the throttle actuator deviate from the standards, 3) a malfunction is found in the throttle actuator sup-
ply voltage, and 4) any other ECM malfunction is found.
DTC No.DTC Detecting ConditionTrouble Area
P0604
P0606
P0607
P0657
ECM malfunctionECM
MONITOR STRATEGY
P0604Random access memory (RAM) error range
check
Related DTCsP0606ECM range check/description
P0657Actuator supply voltage circuit range check
Required sensors/componentsECM
Frequency of operationContinuous
Duration1 sec.
MIL operationImmediate
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
The monitor will run whenever the follow-
ing DTCs are not presentSee ºList of disable a monitorº (on page DI-3)
The typical enabling condition is not avail-
able-
DI1MF-1 1
Page 1344 of 3115
- DIAGNOSTICSENGINE
DI-295
488 Author: Date:
2004 LAND CRUISER (RM1071U)
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
P0604:
RAM mirror check failure
P0606:
ECM error
P0657:
ECM error
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, as well as other data from the time when a malfunction occurred.
Replace ECM (See page SF-60).