| Last Modified: 7-3-2017 | 6.8:8.0.40 | Doc ID: RM000002KQO009X |
| Model Year Start: 2007 | Model: LX470 | Prod Date Range: [08/2006 - ] |
| Title: 2UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0604; Random Access Memory (RAM); 2007 MY LX470 [08/2006 - ] | ||
|
DTC |
P0604 |
Random Access Memory (RAM) |
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 the Random Access Memory (RAM) errors. If outputs from these CPUs are different and deviate from the standards, the ECM will illuminate the MIL and set a DTC immediately.
|
DTC No. |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
P0604 |
ECM RAM errors |
ECM |
MONITOR STRATEGY
|
Related DTCs |
None |
|
Required sensors / components (main) |
ECM |
|
Required sensors / components (sub) |
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 ignition 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 ignition switch ON.
(f) Check DTC.
OK:
P0604 is not present.
| NG |
|
| OK |
|
|
|