DTC B2271: Ignition Hold Monitor Malfunction (07/2015 -): Procedure
- CHECK HARNESS AND CONNECTOR (POWER SOURCE)
- Disconnect the A36 certification ECU (smart key ECU assembly) connector.
- Measure the voltage according to the value(s) in the table below.
Standard Voltage
Tester Connection Condition Specified Condition A36-2 (+B) - Body ground Always 11 to 14 V TEXT IN ILLUSTRATION*a Rear view of wire harness connector
(to Certification ECU (Smart Key ECU Assembly)
Result: NG
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR IN CIRCUIT CONNECTED TO POWER SOURCE
Result: OK
OK
See step 2
- CHECK HARNESS AND CONNECTOR (GROUND)
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition A36-11 (E) - Body ground Always Below 1 Ω TEXT IN ILLUSTRATION*a Rear view of wire harness connector
(Certification ECU (Smart Key ECU Assembly)
Result: NG
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
Result: OK
OK
See step 3
- Measure the resistance according to the value(s) in the table below.
- CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)
- Reconnect the A36 certification ECU (smart key ECU assembly) connector.TEXT IN ILLUSTRATION
*a Component with harness connected
(Certification ECU (Smart Key ECU Assembly)- - - Measure the voltage according to the value(s) in the table below.
Standard Voltage
Tester Connection Condition Specified Condition A36-9 (IG2D) - Body ground Engine switch on (ACC) → Engine switch on (IG) 1 V or less → 9 V or higher H56-6 (IG1D) - Body ground Engine switch on (ACC) → Engine switch on (IG) 1 V or less → 9 V or higher
Result: OK
OK
USE SIMULATION METHOD TO CHECK
(Refer to HOW TO PROCEED WITH TROUBLESHOOTING (07/2015 -) )
Result: NG
NG
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)
(Refer to REMOVAL (07/2015 -) )
- Reconnect the A36 certification ECU (smart key ECU assembly) connector.