| Last Modified: 11-27-2007 | 1.6 C | |
| Service Category: Engine/Hybrid System | Section: Engine Control | |
| Model Year: 2008 | Model: LX570 | Doc ID: RM000002KQO01CX |
| Title: 3UR-FE ENGINE CONTROL: SFI SYSTEM: DESCRIPTION (2008 LX570) | ||
|
DTC |
P0604 |
Internal Control Module Random Access Memory (RAM) Error |
DESCRIPTION
The ECM continuously monitors its internal memory status. This self-check ensures that the ECM is functioning properly. This is diagnosed by internal "mirroring" of the main CPU and sub CPU to detect Random Access Memory (RAM) errors. If outputs from these CPUs are different and deviate from the standard, the ECM will illuminate the MIL and store DTC(s) immediately.
|
DTC Code |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
P0604 |
ECM RAM errors. |
ECM |
MONITOR STRATEGY
|
Related DTCs |
None |
|
Required sensors/components (Main) |
ECM |
|
Required sensors/components (Related) |
None |
|
Frequency of operation |
Continuous |
|
Duration |
16 seconds |
|
MIL operation |
Immediate |
|
Sequence of operation |
None |
TYPICAL ENABLING CONDITIONS
|
None |
- |
TYPICAL MALFUNCTION THRESHOLDS
|
Main CPU and sub CPU mirroring |
Fail |
INSPECTION PROCEDURE
PROCEDURE
|
1. |
CHECK DTC |
(a) Clear DTC
.
(b) Turn the engine switch off.
(c) Disconnect the cable from the negative (-) battery terminal and wait for 1 minute.
(d) Connect the cable to the negative (-) battery terminal.
(e) Turn the engine switch on (IG).
(f) Check DTC.
OK:
P0604 is not output.
|
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