B2271
4GR-FSE STARTING: SMART ACCESS SYSTEM WITH PUSH-BUTTON START: B2271: Ignition Hold Monitor Malfunction
B2271 - Ignition Hold Monitor Malfunction
DESCRIPTION
This DTC is output when a problem such as an open in the AM2 fuse, an open or short in the wire harness between the fuse and power source control ECU, a short in the IG output circuit inside the power source control ECU, a short between the power source control ECU and relay, and a short in the relay is detected.
HINT
When the power source control ECU is replaced with a new one and the negative (-) battery terminal is connected, the power source mode becomes the IG-ON mode. When the battery is removed and reinstalled, the power source mode that was selected when the battery was removed is restored.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
1. INSPECT FUSE (AM2)
(a) Remove the AM2 fuse from the cowl side J/B RH.
(b) Measure the resistance of the fuse.
Standard resistance:
Below 1 Ohms
NG -- REPLACE FUSE
OK -- Continue to next step.
2. CHECK CONNECTORS
(a) Check that the connectors are securely connected and the terminals are not deformed or loose.
OK:
The connectors are securely connected and the terminals are not deformed or loose.
NG -- REPAIR OR REPLACE CONNECTORS
OK -- Continue to next step.
3. CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - BATTERY AND BODY GROUND)
(a) Disconnect the J55 ECU connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
4. INSPECT RELAY (IG2)
(a) Remove the IG2 relay from the engine room R/B No. 2.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- REPLACE FAULTY RELAY OR J/B AND CHECK POWER SOURCE CONTROL ECU
OK -- Continue to next step.
5. INSPECT JUNCTION BLOCK
(a) RH-IG relay:
(1) Disconnect the cowl side J/B RH connectors.
(2) Measure the resistance according to the value(s) in the table below.
Standard resistance:
(b) LH-IG relay:
(1) Disconnect the cowl side J/B LH connectors.
(2) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- REPLACE FAULTY RELAY OR J/B AND CHECK POWER SOURCE CONTROL ECU
OK -- Continue to next step.
6. CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - BODY GROUND)
(a) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- REPAIR OR REPLACE WIRE HARNESS OR CONNECTOR AND CHECK POWER SOURCE CONTROL ECU
OK -- Continue to next step.
7. CHECK WIRE HARNESS (COWL SIDE J/B LH - BODY GROUND)
(a) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- REPAIR OR REPLACE WIRE HARNESS OR CONNECTOR AND CHECK POWER SOURCE CONTROL ECU
OK -- Continue to next step.
8. CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - BODY GROUND)
(a) Reconnect the J55 ECU and J/B connectors.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:
NG -- REPLACE POWER SOURCE CONTROL ECU
OK -- Continue to next step.
9. RECHECK FOR DTC
(a) Delete the DTCs Reading and Clearing Diagnostic Trouble Codes.
(b) Check for DTCs again.
OK:
DTC B2271 is not output.
NG -- REPLACE POWER SOURCE CONTROL ECU
OK -- CHECK INTERMITTENT PROBLEMS
10. REPLACE FAULTY RELAY OR J/B AND CHECK POWER SOURCE CONTROL ECU
(a) Replace a faulty relay or J/B and then connect the power source control ECU connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:
NG -- REPLACE POWER SOURCE CONTROL ECU
OK -- END
11. REPAIR OR REPLACE WIRE HARNESS OR CONNECTOR AND CHECK POWER SOURCE CONTROL ECU
(a) Repair or replace a faulty wire harness or connector and then connect the power source control ECU connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:
NG -- REPLACE POWER SOURCE CONTROL ECU
OK -- END