ENTRY AND START SYSTEM(for Start Function), Diagnostic DTC:B2274
| DTC Code | DTC Name |
|---|---|
| B2274 | ACC Monitor Malfunction |
DESCRIPTION
This DTC is stored when there is a problem in the ACC output circuit, which is from the ACC output terminal of the power management control ECU to the ACC relay.
When the power management control ECU is replaced with a new one and the cable is connected to the negative (-) battery terminal, the power source mode is reset to on (IG). When the battery is removed and reinstalled, the power source mode that was selected when the battery was removed is restored.
DTC Code |
DTC Detection Condition |
Trouble Area |
|---|---|---|
B2274 |
The ACC relay actuation circuit inside the power management control ECU or other related circuit is malfunctioning. |
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
When using the intelligent tester with the engine switch off to troubleshoot: Connect the intelligent tester to the vehicle, and turn a courtesy light switch on and off at 1.5 second intervals until communication between the intelligent tester and vehicle begins.
Before performing the inspection, check that there are no problems related to the CAN communication system and LIN communication system.
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
PROCEDURE
CHECK HARNESS AND CONNECTOR (BATTERY - POWER MANAGEMENT CONTROL ECU)
REPAIR OR REPLACE HARNESS OR CONNECTOR
CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - BODY GROUND)
REPAIR OR REPLACE HARNESS OR CONNECTOR
CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)
Disconnect the H71 power management control ECU and DM instrument panel junction block assembly connectors.
Table 1. Text in Illustration *1
Rear view of wire harness connector
(to Power Management Control ECU)
*2
Front view of wire harness connector
(to Instrument Panel Junction Block Assembly)
Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection
Condition
Specified Condition
H71-19 (ACCD) - DM-7
20°C (68°F)
75 to 117 Ω
H71-19 (ACCD) - Body ground
Always
10 kΩ or higher
REPAIR OR REPLACE HARNESS OR CONNECTOR, OR REPLACE ACC RELAYClick here
INSPECT ACC RELAY
-
Remove the ACC relay.
Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection
Condition
Specified Condition
3 - 5
When battery voltage is not applied to terminals 1 and 2
10 kΩ or higher
3 - 5
When battery voltage is applied to terminals 1 and 2
Below 1 Ω
REPAIR OR REPLACE HARNESS OR CONNECTOR, OR REPLACE ACC RELAYClick here
-
CHECK POWER MANAGEMENT CONTROL ECU
Connect the power management control ECU connector.
Table 2. Text in Illustration *1
Component with harness connected
(Power Management Control ECU)
-
-
Measure the voltage according to the value(s) in the table below.
Standard Voltage
Tester Connection
Switch Condition
Specified Condition
H71-19 (ACCD) - Body ground
Engine switch off
Below 1.0 V
Engine switch on (ACC)
((Voltage at terminal AM21 or AM22) minus 2.0 V) or higher
Table 3. Result Result
Proceed to
OK
A
NG (for LHD)
B
NG (for RHD)
C
REPAIR OR REPLACE HARNESS OR CONNECTOR, OR REPLACE ACC RELAY
Replace the ACC relay with a new or normally functioning part, or repair or replace any damaged wire harness or connector.
CHECK POWER MANAGEMENT CONTROL ECU
Connect the power management control ECU connector.
Table 4. Text in Illustration *1
Component with harness connected
(Power Management Control ECU)
-
-
Measure the voltage according to the value(s) in the table below.
Standard Voltage
Tester Connection
Switch Condition
Specified Condition
H71-19 (ACCD) - Body ground
Engine switch off
Below 1.0 V
Engine switch on (ACC)
((Voltage at terminal AM21 or AM22) minus 2.0 V) or higher
Table 5. Result Result
Proceed to
OK
A
NG (for LHD)
B
NG (for RHD)
C
END