MONITOR DESCRIPTION
The ECM continuously monitors its internal memory status. This self-check ensures that the ECM is functioning properly. It 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 illuminates the MIL and stores the DTC immediately.
DTC No. |
DTC Detection Condition |
Trouble Area |
---|---|---|
P0604 |
ECM RAM error (1 trip detection logic) |
ECM |
MONITOR STRATEGY
Related DTCs |
P0604: ECM RAM Error |
Required Sensors/Components (Main) |
ECM |
Required Sensors/Components (Related) |
None |
Frequency of Operation |
Continuous |
Duration |
6 times |
MIL Operation |
Immediate |
Sequence of Operation |
None |
TYPICAL ENABLING CONDITIONS
Monitor runs whenever the following DTCs are not stored |
None |
TYPICAL MALFUNCTION THRESHOLDS
RAM mirror check |
Fail |
CONFIRMATION DRIVING PATTERN
HINT:
Techstream Display |
Description |
---|---|
NORMAL |
|
ABNORMAL |
|
INCOMPLETE |
|
N/A |
|
HINT:
HINT:
CAUTION / NOTICE / HINT
HINT:
Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. 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.
PROCEDURE
1. |
READ OUTPUT DTC (DTC P0604) |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Clear the DTC (See page ).
(e) Turn the ignition switch off and turn the Techstream off.
(f) Disconnect the Techstream.
(g) Disconnect the cable from the negative (-) battery terminal and wait for 1 minute.
(h) Connect the cable to the negative (-) battery terminal.
(i) Connect the Techstream to the DLC3.
(j) Turn the ignition switch to ON.
(k) Turn the Techstream on.
(l) Wait 16 seconds or more.
(m) Enter the following menus: Powertrain / Engine / Trouble Codes.
(n) Read the DTCs.
Result |
Proceed to |
---|---|
DTC is not output |
A |
DTC P0604 is output |
B |
A |
CHECK FOR INTERMITTENT PROBLEMS |
B |
REPLACE ECM |
Road Test
ROAD TEST
1. PROBLEM SYMPTOM CONFIRMATION
(a) Inspect the SET function.
Text in Illustration
*1
ON/OFF
*2
- SET
(1) Turn the cruise control main switch on.
(2) Drive at the required speed of bet ...
On-vehicle Inspection
ON-VEHICLE INSPECTION
PROCEDURE
1. INSPECT GARAGE DOOR OPENER
(a) To inspect the garage door opener system, press each switch and check
that the LED in the "HomeLink" logo illuminates as illustrated. If one or
more of the switch ...
On-vehicle Inspection
ON-VEHICLE INSPECTION
CAUTION / NOTICE / HINT
CAUTION:
Be sure to follow the correct removal and installation procedures of the door
side airbag sensor.
PROCEDURE
1. INSPECT DOOR SIDE AIRBAG SENSOR (VEHICLE NOT INVOLVED IN COLLISION)
(a) Perform a diag ...