2007 TOYOTA SIENNA Service Repair Manual

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Page 609 of 3000

TOYOTA SIENNA 2007 Service Repair Manual ES–3162GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
MONITOR DESCRIPTION
The battery supplies electricity to the ECM even when the ignition switch is off. This power allows the
ECM to store data

Page 610 of 3000

TOYOTA SIENNA 2007 Service Repair Manual 2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–317
ES
INSPECTION PROCEDURE
HINT:
Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition
information as f

Page 611 of 3000

TOYOTA SIENNA 2007 Service Repair Manual ES–3182GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
(a) Check the harness and the connector between the EFI
No. 1 fuse and ECM.
(1) Remove the EFI No. 1 fuse from the engine room
junction block

Page 612 of 3000

TOYOTA SIENNA 2007 Service Repair Manual 2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–319
ES
(a) Check that the battery is not depleted.
NG
OK
5INSPECT BATTERY
REPLACE BATTERY
CHECK AND REPLACE ENGINE ROOM RELAY BLOCK

Page 613 of 3000

TOYOTA SIENNA 2007 Service Repair Manual ES–3202GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
DESCRIPTION
The ECM continuously monitors its own internal memory status, internal circuits, and output signals
transmitted to the throttle ac

ES–3202GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
DESCRIPTION
The ECM continuously monitors its own internal memory status, internal circuits, and output signals
transmitted to the throttle actuator. This self-check ensures that the ECM is functioning properly. If any
malfunction is detected, the ECM sets the appropriate DTC and illuminates the MIL.
The ECM memory status is diagnosed by internal mirroring 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 illuminates the MIL and sets a DTC if: 1) outputs from the two CPUs are different or deviate from the
standards, 2) the signals sent 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.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
ECM RAM errors:
INSPECTION PROCEDURE
Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition when
malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was
moving 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.
(a) Connect the intelligent tester to the DLC3.
(b) Turn the ignition switch to the ON position.
(c) Turn the tester on.
(d) Select the following menu items: DIAGNOSIS /
ENHANCED OBD II / DTC INFO / CURRENT CODES.
(e) Read DTCs.
DTC P0604Internal Control Module Random Access Mem-
ory (RAM) Error
DTC No. DTC Detection Condition Trouble Area
P0604 ECM internal error (1 trip detection logic) ECM
Related DTCs P0604: ECM RAM error
Required Sensors/Components (Main) ECM
Required Sensors/Components (Related) -
Frequency of Operation Continuous
Duration 16 seconds
MIL Operation Immediate
Sequence of Operation None
Monitor runs whenever following DTCs not present None
RAM mirror check Fail
1CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0604)

Page 614 of 3000

TOYOTA SIENNA 2007 Service Repair Manual 2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–321
ES
Result
B
A
Display (DTC Output) Proceed to
P0604 A
No output B
CHECK FOR INTERMITTENT PROBLEMS
REPLACE ECM

Page 615 of 3000

TOYOTA SIENNA 2007 Service Repair Manual ES–3222GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
DESCRIPTION
The ECM continuously monitors its internal processors (CPUs), A/F sensor transistors and heated oxygen
sensor (HO2S) transistors.

Page 616 of 3000

TOYOTA SIENNA 2007 Service Repair Manual 2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–323
ES
OK
(a) Connect the intelligent tester to the DLC3.
(b) Start the engine and turn the tester on.
(c) Warm up the engine at an engine speed of 25

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