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DI-721
DIAGNOSTICS - ENGINE (2UZ-FE)
DIA8I-03
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 "mirroring" 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 Condition Trouble Area
P0604
P0606
ECM malfunction S ECM
P0607
P0657
MONITOR STRATEGY
P0604 Random access memory (RAM) error
P0606 CPU malfunction
Related DTC
R l t d DTCs
P0607 ECM range check
P0657 ETCS power supply
Required sensors/components ECM
Frequency of operation Continuous
Duration Within 1 sec.
MIL operation Immediate
Sequence of operation None
TYPICAL ENABLING CONDITIONS
The monitor will run whenever these
See page DI-437
DTCs are not present
The typical enabling condition is not avail-
-
able
DI-722
DIAGNOSTICS - ENGINE (2UZ-FE)
TYPICAL MALFUNCTION THRESHOLDS
Detection Criteria Threshold
P0604:
RAM RAM mirror check fail
P0606:
Either of the following conditions is met Condition 1 or 2
1. Difference between TP of main CPU and TP of sub CPU 0.3 V or more
2. Difference between APP of main CPU and APP of sub
0.3 V or more
CPU
P0607:
Either of the following conditions is met Condition 1 or 2
1. All of the 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:
ECTS power supply when ignition switch OFF to ON 7 V or more
INSPECTION PROCEDURE
HINT:
Read freeze frame data using the hand-held tester. 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.
Replace ECM (See page SF-82).
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