Refer to "51.Engine Control 1A.Troubleshooting(IBS (RZ4E-TC)) diagnostic system check-IBS".
1) Connect the scan tool.
2) Start the engine.
3) Observe the DTC information with a scan tool. Is a DTC set?
Yes
=>Go to Battery sensor power supply circuit check.
No
Go to Intermittent conditions of IBS.
Refer to "202.Engine 15D.Symptom(IBS (RZ4E-TC)) intermittent conditions of IBS".
1) Turn OFF the ignition switch.
2) Disconnect the battery sensor harness connector (C49).
3) Connect a test lamp between the battery power supply circuit (pin 5 of C49) and the body ground. Does the test lamp illuminate?
Refer to "LHD Battery Sensor" in the ETM (wiring diagram). (Open using the ETM viewer.).
Refer to "RHD Battery Sensor" in the ETM (wiring diagram). (Open using the ETM viewer.).
Yes
=>Go to Battery sensor harness connector inspection.
No
1) Inspect for a blown out IBS 5A fuse. Is the result normal?
Yes
=>Go to Inspection for open circuit in battery sensor power supply circuit.
No
Replace the fuse. If the fuse blows out again, repair the short to ground in the circuits relating to the IBS 5A fuse.
1) Inspect the battery power supply circuit between the battery and the battery sensor (pin 5 of C49) for an open circuit or high resistance. Is the result normal?
Refer to "LHD Battery Sensor" in the ETM (wiring diagram). (Open using the ETM viewer.).
Refer to "RHD Battery Sensor" in the ETM (wiring diagram). (Open using the ETM viewer.).
Yes
=>Go to Battery sensor harness connector inspection.
No
Repair the circuit as necessary.
1) Inspect for poor connections at the battery sensor harness connector (pin 5 of C49). Is the connection status normal?
Refer to "LHD Battery Sensor" in the ETM (wiring diagram). (Open using the ETM viewer.).
Refer to "RHD Battery Sensor" in the ETM (wiring diagram). (Open using the ETM viewer.).
Yes
=>Go to Battery sensor replacement.
No
Repair the connections as necessary.
Refer to "1.Engine 1J.Electrical(RZ4E-TC) battery sensor removal".
Refer to "1.Engine 1J.Electrical(RZ4E-TC) battery sensor installation".
Procedure completion
1) Clear the DTC with a scan tool.
2) Turn OFF the ignition switch for 30 seconds or more.
3) Start and idle the engine.
4) Observe the DTC information with a scan tool.