DTC P0B25:00 [MZR 2.0 DISI i-stop]

id0102d4950700

DTC P0B25:00

Main battery voltage low

DETECTION CONDITION

•  Main battery voltage remains lower than the specified value for a certain period until the engine restarts after engine-stop via i-stop function remains for a specified time.

Diagnostic support note

•  This is a continuous monitor (other).

•  The MIL does not illuminate.

•  FREEZE FRAME DATA (Mode 2)/Snapshot data is not available.

•  The DTC is stored in the PCM memory.

POSSIBLE CAUSE

•  Main battery malfunction

•  PCM connector or terminals malfunction

•  Short to ground or open circuit in backup voltage circuit

―  Short to ground in wiring harness between main battery positive terminal and PCM terminal 1BA

―  ENG+B 10 A fuse malfunction

―  Open circuit in wiring harness between main battery positive terminal and PCM terminal 1BA

•  PCM malfunction

DTC P0B25:00	Main battery voltage low
DETECTION CONDITION	• Main battery voltage remains lower than the specified value for a certain period until the engine restarts after engine-stop via i-stop function remains for a specified time. Diagnostic support note • This is a continuous monitor (other). • The MIL does not illuminate. • FREEZE FRAME DATA (Mode 2)/Snapshot data is not available. • The DTC is stored in the PCM memory.
POSSIBLE CAUSE	• Main battery malfunction • PCM connector or terminals malfunction • Short to ground or open circuit in backup voltage circuit ― Short to ground in wiring harness between main battery positive terminal and PCM terminal 1BA ― ENG+B 10 A fuse malfunction ― Open circuit in wiring harness between main battery positive terminal and PCM terminal 1BA • PCM malfunction

Diagnostic procedure

STEP	INSPECTION		ACTION
1	VERIFY RELATED SERVICE INFORMATION AVAILABILITY • Verify related Service Information availability. • Is any related Service Information available?	Yes	Perform repair or diagnosis according to the available Service Information. • If the vehicle is not repaired, go to the next step.
1		No	Go to the next step.
2	INSPECT MAIN BATTERY • Inspect the main battery. (See BATTERY INSPECTION [MZR 2.0 DISI i-stop].) • Is there any malfunction?	Yes	Recharge or replace the main battery, then go to Step 5. (See BATTERY RECHARGING [MZR 2.0 DISI i-stop].) (See BATTERY REMOVAL/INSTALLATION [MZR 2.0 DISI i-stop].)
2		No	Go to the next step.
3	INSPECT PCM CONNECTOR CONDITION • Switch the ignition to off. • Disconnect the PCM connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the terminal and/or connector, then go to Step 5.
3		No	Go to the next step.
4	INSPECT BACK-UP VOLTAGE CIRCUIT FOR SHORT TO GROUND OR OPEN CIRCUIT • PCM connector is disconnected. • Measure the voltage at the PCM terminal 1BA (wiring harness-side). • Is the voltage B+?	Yes	Go to the next step.
4		No	Inspect the ENG+B 10 A fuse. • If the fuse is melt: ― Repair or replace the wiring harness for a possible short to ground. ― Replace the fuse. • If the fuse is deterioration: ― Replace the fuse. • If the fuse is normal: ― Repair or replace the wiring harness for a possible open circuit. Go to the next step.
5	VERIFY DTC TROUBLESHOOTING COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the M-MDS. (See AFTER REPAIR PROCEDURE [MZR 2.0 DISI i-stop].) • Perform the KOEO or KOER self test. (See KOEO/KOER SELF TEST [MZR 2.0 DISI i-stop].) • Is the same DTC present?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION [MZR 2.0 DISI i-stop].) Go to the next step.
5		No	Go to the next step.
6	VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [MZR 2.0 DISI i-stop].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [MZR 2.0 DISI i-stop].)
6		No	DTC troubleshooting completed.