- ECM CPUs malfunction
- A/F sensor transistors malfunction
- HO2S transistors malfunction
| Last Modified: 7-3-2017 | 6.8:8.0.40 | Doc ID: RM000002I3S00CX |
| Model Year Start: 2007 | Model: LX470 | Prod Date Range: [08/2006 - ] |
| Title: 2UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0606; ECM / PCM Processor; 2007 MY LX470 [08/2006 - ] | ||
|
DTC |
P0606 |
ECM / PCM Processor |
DESCRIPTION
The ECM continuously monitors its internal processors (CPUs), A/F sensor transistors and heated oxygen sensor (HO2S) transistors. This self-check ensures that the ECM is functioning properly. This is diagnosed by internal "mirroring" of the main and sub CPUs to detect processor errors. If outputs from the processors deviate from the standards, the ECM will illuminate the MIL and set a DTC immediately.
|
DTC No. |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
P0606 |
|
|
NOTICE:
First check for an exhaust gas leak around the HO2S if P0606 is present. An exhaust gas leak generates noise in the HO2S output. The ECM may interpret this as an HO2S transistor malfunction and set P0606.
MONITOR STRATEGY
|
Related DTCs |
None |
|
Required sensors / components (main) |
ECM |
|
Required sensors / components (sub) |
APP sensor, TP sensor, Brake switch, Cruise control, A/F sensor, HO2S |
|
Frequency of operation |
Continuous |
|
Duration |
60 seconds |
|
MIL operation |
immediate |
|
Sequence of operation |
None |
TYPICAL ENABLING CONDITIONS
|
Engine |
Running |
|
Estimated A/F sensor temperature |
450 - 800°C (842 - 1,472°F) |
|
Estimated HO2S temperature |
450 - 800°C (842 - 1,472°F) |
TYPICAL MALFUNCTION THRESHOLDS
|
Difference of main APP and sub APP |
0.3 V or more |
|
Difference of main TP and sub TP |
0.3 V or more |
|
Difference of main brake switch signal and sub brake switch signal |
Different |
|
Cruise control |
Fail |
|
A/F sensor transistors |
Fail |
|
HO2S transistors |
Fail |
INSPECTION PROCEDURE
PROCEDURE
|
1. |
CHECK FOR ANY OTHER DTCS OUTPUT |
(a) Connect the intelligent tester to the CAN VIM.
Then connect the CAN VIM to the DLC3.
(b) Turn the engine switch to ON and turn the tester on.
(c) Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.
(d)
Read the DTCs
![2007 MY LX470 [08/2006 - ]; 2UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: DTC CHECK / CLEAR](../../../../stylegraphics/info.gif "2007 MY LX470 [08/2006 - ]; 2UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: DTC CHECK / CLEAR")
.
|
Display (DTC Output) |
Proceed to |
|---|---|
|
P0606 and P0136, P0137, P0138, P0156, P0157 or P0158 are output |
A |
|
Only P0606 is output |
B |
| B |
|
|
|
2. |
INSPECT DTC (P0136, P0137, P0138, P0156, P0157 OR P0158) |
(a) Refer to the P0136, P0137, P0138, P0156, P0157 or P0158 flowchart.
HINT:
-
If P0136 or P0156 is output, troubleshoot for that DTC first
. Then proceed to "Inspect ECM".
-
If P0137 or P0157 is output, troubleshoot for that DTC first
. Then proceed to "Inspect ECM".
-
If P0138 or P0158 is output, troubleshoot for that DTC first
. Then proceed to "Inspect ECM".
- If DTC P0606 and P0136, P0137, P0138, P0156, P0157 or P0158 are output, the output voltage of the heated oxygen sensor may remain close to 0 V or become high (around 1 V or higher).
| NEXT |
|
|
3. |
CHECK FOR EXHAUST GAS LEAK |
(a) Allow the engine to idle, and then rev the engine.
(b) Check for exhaust gas leaks around the heated oxygen sensor.
If any exhaust gas leaks are present, repair them and proceed to "Perform Confirmation Driving Pattern". If no exhaust gas leaks are present, proceed to "Perform Confirmation Driving Pattern".
HINT:
- If no exhaust gas leaks are present, there may be a malfunction in the heated oxygen sensor circuit.
- If any exhaust gas leaks are present around the heated oxygen sensor, noise appears in the output voltage of the heated oxygen sensor.
|
|
4. |
PERFORM CONFIRMATION DRIVING PATTERN |
(a)
Clear DTC
.
(b) Connect the intelligent tester to the CAN VIM.
Then connect the CAN VIM to the DLC3.
(c) Start the engine.
(d) Warm up the engine until the engine coolant temperature becomes 75°C (167°F) or higher.
(e) Perform the driving pattern.
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
(1) Accelerate the vehicle to 80 km/h (50 mph) and stop the vehicle.
(2) Drive the vehicle between 60 and 80 km/h (35 and 50 mph) for 5 minutes.
(f) Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.
(g) Read the DTCs.
|
Display (DTC Output) |
Proceed to |
|---|---|
|
P0606 and P0136, P0137, P0138, P0156, P0157 or P0158 are output |
A |
|
Only P0606 is output |
B |
|
No DTC is output |
C |
| B |
|
| C |
|
|
|
5. |
INSPECT DTC (P0136, P0137, P0138, P0156, P0157 OR P0158) |
(a) Refer to the P0136, P0137, P0138, P0156, P0157 or P0158 flowchart.
HINT:
-
If P0136 or P0156 is output, troubleshoot for that DTC first
. Then proceed to "Inspect ECM".
-
If P0137 or P0157 is output, troubleshoot for that DTC first
. Then proceed to "Inspect ECM".
-
If P0138 or P0158 is output, troubleshoot for that DTC first
. Then proceed to "Inspect ECM".
- If DTC P0606 and P0136, P0137, P0138, P0156, P0157 or P0158 are output, the output voltage of the heated oxygen sensor may remain close to 0 V or become high (around 1 V or higher).
|
|
6. |
INSPECT ECM |
(a)
Clear DTC
.
(b) Stop the engine and wait for 30 minutes.
(c) Connect the intelligent tester to the CAN VIM.
Then connect the CAN VIM to the DLC3.
(d) Start the engine and allow it to idle for 2 minutes.
(e) Turn the tester on.
(f) Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.
(g) Read the DTCs.
|
Display (DTC Output) |
Proceed to |
|---|---|
|
DTC is not output |
A |
|
P0606 is output |
B |
| B |
|
| A |
|
|
|