Brand:

Toyota

Model Name:

4Runner GRN210 215 UZN210 215

Manual:

Repair Manual

Section:

1Gr-Fe Engine Control System

Title:

Sfi System

  1. Monitor description

  2. Monitor strategy

  3. Typical enabling conditions

  4. Typical malfunction thresholds

  5. Inspection procedure

  6. Replace ecm

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


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MONITOR DESCRIPTION

The ECM continuously monitors its own internal memory status, internal circuits, and output signals transmitted to the throttle actuator. This self-check insures 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.

DTC No.
DTC Detection Conditions
Trouble Areas
P0604
P0606
P0607
P0657
ECM internal error (1 trip detection logic)
ECM

MONITOR STRATEGY


Related DTCs
P0604: ECM RAM error
P0606: ECM range check
P0607: ECM CPU malfunction
P0657: ETCS power supply
Required Sensors / Components (Main)
ECM
Required Sensors / Components (Related)
-
Frequency of Operation
Continuous
Duration
Within 1 second
MIL Operation
Immediate
Sequence of Operation
None

TYPICAL ENABLING CONDITIONS


All:
The monitor will run whenever these DTCs are not present
None

TYPICAL MALFUNCTION THRESHOLDS


ECM RAM errors (P0604):
RAM
RAM mirror check failure

P0606:
Either of following conditions is met:
Condition 1 or 2
1. Difference between throttle valve position of main CPU and throttle valve position of sub CPU
0.3 V or more
2. Difference between accelerator pedal position of main CPU and accelerator pedal position of sub CPU
0.3 V or more

P0607:
Either of the following conditions is met
Condition 1 or 2
1. All of following conditions are met
Condition (a), (b) and (c)
(a). CPU reset
1 time or more
(b). Difference between TP and APP learned
0.4 V or more
(c). Electronic throttle actuator
OFF
2. CPU reset
2 times or more

P0657:
ETCS power supply when ignition switch OFF to ON
7 V or more

INSPECTION PROCEDURE

HINT:
Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air/fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.
1.REPLACE ECM

  1. Replace the ECM (Click here).


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