| Last Modified: 01-30-2024 | 6.11:8.1.0 | Doc ID: RM100000002EMA8 |
| Model Year Start: 2024 | Model: RAV4 | Prod Date Range: [10/2023 - ] |
| Title: STOP AND START: STOP AND START SYSTEM: P164400; ECU Malfunction (Starter Circuit); 2024 MY RAV4 [10/2023 - ] | ||
|
DTC |
P164400 |
ECU Malfunction (Starter Circuit) |
DESCRIPTION
If a malfunction is detected in the starter circuit, the engine stop and start ECU stores DTC P164400.
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
MIL |
Warning Indicate |
Note |
|---|---|---|---|---|---|---|
|
P164400 |
ECU Malfunction (Starter Circuit) |
Both of the following conditions are met for 0.2 seconds or more (1 trip detection logic):
|
|
Comes on |
Does not come on |
SAE Code: P1644 |
MONITOR STRATEGY
|
Related DTCs |
P1644: Engine stop and start ECU internal starter relay circuit functional |
|
Required Sensors/Components (Main) |
Engine stop and start ECU |
|
Required Sensors/Components (Related) |
- |
|
Frequency of Operation |
Continuous |
|
Duration |
1 second: Case2 0.2 seconds: Case1, Case3, Case4, Case5, Case6, Case7 |
|
MIL Operation |
Immediate |
|
Sequence of Operation |
None |
TYPICAL ENABLING CONDITIONS
All
|
All of the following conditions are met |
- |
|
Write Inhibit |
permit |
|
Time after Write status forbiddance to permit |
0.5 seconds or more |
|
Ignition switch |
ON |
|
Time after ignition switch is off to ON |
0.5 seconds or more |
|
A/D converter fail (P060B) |
Not detected |
Case1
|
All of the following conditions are met |
- |
|
Engine stop and start ECU internal high side switch for starter relay |
OFF |
|
Engine stop and start ECU internal low side switch for starter relay |
OFF |
|
Engine stop and start ECU internal limit switch for starter relay |
OFF |
|
Engine stop and start ECU starter relay terminal voltage level |
High |
Case2
|
All of the following conditions are met |
- |
|
Engine stop and start ECU internal high side switch for starter relay |
OFF |
|
Engine stop and start ECU internal low side switch for starter relay |
OFF |
|
Engine stop and start ECU internal limit switch for starter relay |
OFF |
|
Engine stop and start ECU starter relay terminal voltage level |
Low |
Case3
|
All of the following conditions are met |
- |
|
Engine stop and start ECU internal starter relay circuit check* |
Activated |
|
Engine stop and start ECU internal high side switch for starter relay |
OFF |
|
Engine stop and start ECU internal low side switch for starter relay |
OFF |
|
Engine stop and start ECU internal limit switch for starter relay |
ON |
|
Engine stop and start ECU starter relay terminal voltage level |
Low |
Case4
|
All of the following conditions are met |
- |
|
Engine stop and start ECU internal starter relay circuit check* |
Activated |
|
Engine stop and start ECU internal high side switch for starter relay |
ON |
|
Engine stop and start ECU internal low side switch for starter relay |
OFF |
|
Engine stop and start ECU internal limit switch for starter relay |
ON |
Case5
|
All of the following conditions are met |
- |
|
Engine stop and start ECU internal starter relay circuit check* |
Activated |
|
Engine stop and start ECU internal high side switch for starter relay |
OFF |
|
Engine stop and start ECU internal low side switch for starter relay |
ON |
|
Engine stop and start ECU internal limit switch for starter relay |
ON |
|
Engine stop and start ECU starter relay terminal voltage level |
Low |
Case6
|
All of the following conditions are met |
- |
|
Engine stop and start ECU internal high side switch for starter relay |
ON |
|
Engine stop and start ECU internal low side switch for starter relay |
ON |
|
Starter relay overcurrent |
Not detected |
Case7
|
Engine stop and start ECU internal high side switch for starter relay |
OFF |
|
*: All of the following conditions are met |
- |
|
Write Inhibit |
permit |
|
Time after Write status forbiddance to permit |
0.5 seconds or more |
|
Ignition switch |
ON |
|
Time after ignition switch is off to ON |
0.5 seconds or more |
|
Battery voltage |
8 V or higher |
|
A/D converter fail (P060B) |
Not detected |
|
Engine stop and start ECU internal starter relay circuit fail (P1644) |
Not detected |
|
Engine stop and start ECU processer fail (P0606) |
Not detected |
|
Lost communication with skid control ECU (brake actuator assembly) (U0129) |
Not detected |
|
Starter |
OFF |
|
Engine |
Running |
|
Fuel cut |
OFF |
|
One of the following conditions (a), (b) or (c) is met |
- |
|
(a) Shift position |
D range |
|
(b) Shift position |
R range |
|
(c) Shift position |
S range |
|
Vehicle speed |
7 to 15 km/h (4.3 to 9.3 mph) |
|
Engine stop and start ECU starter relay voltage |
Higher than [Battery voltage x 0.44] V, and less than [Battery voltage x 0.88] V |
|
Engine stop and start ECU internal high side switch for starter relay |
OFF |
|
Engine stop and start ECU internal low side switch for starter relay |
OFF |
|
Time after engine stop and start ECU internal limit switch for starter relay OFF to ON |
0.3 seconds or more |
|
Time after engine stop and start ECU internal high side switch for starter relay ON to OFF |
0.05 seconds or more |
|
Engine stop and start ECU internal limit switch for starter relay |
ON |
|
Time after engine stop and start ECU internal low side switch for starter relay ON to OFF |
0.05 seconds or more |
|
Time after engine stop and start ECU internal limit switch for starter relay ON to OFF |
0.05 seconds or more |
TYPICAL MALFUNCTION THRESHOLDS
Case 1, Case2, Case5
|
Engine stop and start ECU starter relay voltage |
Higher than [Battery voltage x 0.44] V |
Case 3
|
Either of the following conditions (a) or (b) is met |
- |
|
(a) Engine stop and start ECU starter relay voltage |
[Battery voltage x 0.44] V or less |
|
(b) Engine stop and start ECU starter relay voltage |
[Battery voltage x 0.88] V or higher |
Case 4
|
Engine stop and start ECU starter relay voltage |
Less than [Battery voltage x 0.88] V |
Case 6
|
Engine stop and start ECU starter relay terminal voltage level |
Low |
Case 6
|
Starter relay overcurrent |
Detected |
CONFIRMATION DRIVING PATTERN
HINT:
-
If the cable is disconnected from the battery terminal, stop and start control is prohibited until refresh charge is completed.
In this case, let the vehicle idle to complete the refresh charge. The refresh charge is complete when the Data List item "Status of Battery Charge Control" changes from "Refresh Charge Mode". (Usually, idling the engine for 5 to 60 minutes with the battery fluid temperature at 11°C (51°F) or higher, the refresh charge will be completed.)
-
If the Techstream is not available and the Data List item "Status of Battery Charge Control" cannot be checked, charge the battery by idling the engine for approximately 5 to 60 minutes or driving the vehicle, and then drive the vehicle and check that stop and start control operates.
If the engine is started with the hood open, the system determines that a jump start has occurred. Therefore, make sure that the hood is closed before starting the engine and driving the vehicle.
- After the refresh charge completes, turn the ignition switch off, wait for at least 30 seconds, and then start the engine again. If the vehicle enters refresh charge mode again while the engine is idling, the initial refresh charge did not properly complete, so wait for the refresh charge to complete.
- Allow the engine to idle for 3 minutes after it is warmed up and check that the engine idle speed is within 50 rpm of the target idle speed.
-
When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
Click here
![2024 MY RAV4 [10/2023 - ]; STOP AND START: STOP AND START SYSTEM: DTC CHECK / CLEAR](/t3Portal/stylegraphics/info.gif)
- When clearing the permanent DTCs, do not disconnect the cable from the battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.
CONFIRMATION AFTER TROUBLESHOOTING
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Clear the DTCs.
Powertrain > Stop and Start > Clear DTCs
(e) Start the engine and warm it up.
(f) Drive the vehicle at 7 km/h (4 mph) or more.
CAUTION:
When performing Confirmation Driving Pattern, obey all speed limits and traffic laws.
(g) Depress the brake pedal and stop the vehicle.
(h) Allow the engine to stop by stop and start control. (Keep the shift lever in D.)
(i) Release the brake pedal with the shift lever in D to start the engine.
(j) Check that DTCs are not output.
Powertrain > Stop and Start > Trouble Codes
STOP AND START SYSTEM OPERATION CHECK
Click here
WIRING DIAGRAM
Refer to DTC P061511.
Click here
CAUTION / NOTICE / HINT
NOTICE:
-
Before replacing the engine stop and start ECU, read the number of starter operations and write it into a new engine stop and start ECU.
Click here
-
After replacing the engine stop and start ECU or air conditioning amplifier assembly, reset and perform learning of the air conditioning information in the engine stop and start ECU.
Click here
-
After replacing the engine stop and start ECU or airbag ECU assembly, clear and calibrate the deceleration sensor zero point in the engine stop and start ECU.
Click here
-
When the engine stop and start ECU or oil pump with solenoid assembly is replaced, check the oil pump with solenoid assembly.
Click here
- Inspect the fuses for circuits related to this system before performing the following procedure.
HINT:
-
If DTCs P060B1C (Analog to Digital Converter Circuit Voltage Out of Range), P060B49 (Analog to Digital Converter Internal Electronic Failure) or P060B71 (Analog to Digital Converter Actuator Stuck) and P164400 (ECU Malfunction (Starter Circuit)) are output simultaneously, perform troubleshooting for DTC P060B1C, P060B49 or P060B71 first as it may have caused DTC P164400 to be stored.
Click here
-
If DTCs P061519 (Starter Relay Circuit Current Above Threshold) and P164400 (ECU Malfunction (Starter Circuit)) are output simultaneously, perform troubleshooting for DTC P061519 first as it may have caused DTC P164400 to be stored.
Click here
-
Using the Techstream, read the freeze frame data before troubleshooting. System condition information is recorded as freeze frame data the moment a DTC is stored. This information can be useful when troubleshooting.
Click here
-
DTCs for the stop and start system are not cleared even if the malfunction has been repaired. After repairing the malfunction, be sure to clear the DTCs.
Click here
PROCEDURE
|
1. |
CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P164400) |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Stop and Start / Trouble Codes.
(e) Read the DTCs.
Powertrain > Stop and Start > Trouble Codes
|
Result |
Proceed to |
|---|---|
|
DTC P164400 is output |
A |
|
DTCs P060B1C, P060B49 or P060B71 and P164400 are output |
B |
|
DTCs P061519 and P164400 are output |
C |
HINT:
If DTCs P060B1C, P060B49, P060B71 or P061519 and P164400 are output simultaneously, troubleshoot for DTC P060B1C, P060B49, P060B71 or P061519 first.
| B |
|
| C |
|
|
|
2. |
CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - ST NO. 1 RELAY) |
(a) Disconnect the engine stop and start ECU connector.
(b) Remove the ST NO. 1 relay from the No. 1 engine room relay block and No. 1 junction block assembly.
(c) Disconnect the certification ECU (smart key ECU assembly) connector. (w/ Smart Key System)
(d) Disconnect the park/neutral position switch assembly connector.
(e) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A34-21 (STA) - 2 (ST NO. 1 relay) |
Always |
Below 1 Ω |
|
A34-21 (STA) or 2 (ST NO. 1 relay) - Body ground and other terminals |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
3. |
CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - PARK/NEUTRAL POSITION SWITCH ASSEMBLY) |
(a) Disconnect the engine stop and start ECU connector.
(b) Disconnect the park/neutral position switch assembly connector.
(c) Disconnect the certification ECU (smart key ECU assembly) connector. (w/ Smart Key System)
(d) Remove the ST NO. 1 relay from the No. 1 engine room relay block and No. 1 junction block assembly.
(e) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A34-21 (STA) - C31-9 (L) |
Always |
Below 1 Ω |
|
A34-21 (STA) or C31-9 (L) - Body ground and other terminals |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
4. |
INSPECT RELAY (ST NO. 1 RELAY) |
(a) Inspect the ST NO. 1 relay.
Click here
| NG |
|
REPLACE RELAY (ST NO. 1 RELAY) |
|
|
5. |
CHECK HARNESS AND CONNECTOR (ST NO. 1 RELAY - BODY GROUND) |
(a) Remove the ST NO. 1 relay from the No. 1 engine room relay block and No. 1 junction block assembly.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
1 (ST NO. 1 relay) - Body ground |
Always |
Below 1 Ω |
| OK |
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|