DTC P0B29:00 [MZR 2.0 DISI i-stop]

id0102d4960000

DTC P0B29:00

Sub battery voltage low

DETECTION CONDITION

•  Detects DTC if any of the following conditions are met:

―  Sub battery voltage remains lower than the specified value for a certain period when the engine restarts via i-stop function.

―  Sub battery voltage remains lower than the specified value for a certain period while the charge relay operates.

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

•  Sub battery malfunction

•  PCM connector or terminals malfunction

•  Short to ground or open circuit in sub battery circuit

―  Short to ground in wiring harness between sub battery positive terminal and PCM terminal 1AW

―  STARTER 2 250 A fuse malfunction

―  BATT 2 10 A fuse malfunction

―  Open circuit in wiring harness between sub battery positive terminal and PCM terminal 1AW

•  Number of times sub battery can be used has exceeded maximum.

•  PCM malfunction

DTC P0B29:00	Sub battery voltage low
DETECTION CONDITION	• Detects DTC if any of the following conditions are met: ― Sub battery voltage remains lower than the specified value for a certain period when the engine restarts via i-stop function. ― Sub battery voltage remains lower than the specified value for a certain period while the charge relay operates. 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	• Sub battery malfunction • PCM connector or terminals malfunction • Short to ground or open circuit in sub battery circuit ― Short to ground in wiring harness between sub battery positive terminal and PCM terminal 1AW ― STARTER 2 250 A fuse malfunction ― BATT 2 10 A fuse malfunction ― Open circuit in wiring harness between sub battery positive terminal and PCM terminal 1AW • Number of times sub battery can be used has exceeded maximum. • 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	VERIFY THAT THE i-stop WARNING LIGHT (AMBER) flashes • Does the i-stop warning light (amber) flash?	Yes	Replace the sub battery. (See BATTERY REMOVAL/INSTALLATION [MZR 2.0 DISI i-stop].) Go to the next step.
2		No	Go to Step 5.
3	INSPECT THE ELECTROLYTE GRAVITY OF THE MAIN BATTERY • Inspect the electrolyte specific gravity of the main battery. (See BATTERY INSPECTION [MZR 2.0 DISI i-stop].) • Is the electrolyte gravity of all the cells within the 1.17—1.22 range?	Yes	Recharge the main battery. (See BATTERY RECHARGING [MZR 2.0 DISI i-stop].) Go to the next step.
3		No	When the electrolyte gravity is 1.16 or less • Replace the main battery (See BATTERY REMOVAL/INSTALLATION [MZR 2.0 DISI i-stop].) • Go to the next step. When the electrolyte gravity is 1.22 or more • Go to Step 8.
4	ONCE AGAIN INSPECT THE ELECTROLYTE GRAVITY OF THE MAIN BATTERY • Once again inspect the electrolyte gravity of the main battery. (See BATTERY INSPECTION [MZR 2.0 DISI i-stop].) • Is the electrolyte gravity of all the cells 1.21 or more?	Yes	Go to Step 8.
4		No	Replace the main battery. (See BATTERY REMOVAL/INSTALLATION [MZR 2.0 DISI i-stop].) Go to Step 8.
5	INSPECT SUB BATTERY • Inspect the sub battery. (See BATTERY INSPECTION [MZR 2.0 DISI i-stop].) • Is there any malfunction?	Yes	Recharge or replace the sub battery, then go to Step 8. (See BATTERY RECHARGING [MZR 2.0 DISI i-stop].) (See BATTERY REMOVAL/INSTALLATION [MZR 2.0 DISI i-stop].)
5		No	Go to the next step.
6	INSPECT PCM CONNECTOR CONDITION • Switch the ignition to off. • Disconnect the PCM connector. • Inspect for poor connection (such as damaged/pulled-out pins, and corrosion). • Is there any malfunction?	Yes	Repair or replace the terminal and/or connector, then go to Step 8.
6		No	Go to the next step.
7	INSPECT SUB BATTERY CIRCUIT FOR SHORT TO GROUND OR OPEN CIRCUIT • PCM connectors is disconnected. • Measure the voltage at the PCM terminal 1AW (wiring harness-side). • Is the voltage B+?	Yes	Go to the next step.
7		No	Inspect the STARTER 2 250 A fuse and BATT 2 10 A fuse. • If the fuse is melt: ― Repair or replace the wiring harness for a possible short to ground. ― Replace the malfunctioning fuse. • If the fuse is deterioration: ― Replace the malfunctioning fuse. • If the fuse is normal: ― Repair or replace the wiring harness for a possible open circuit. Go to Step 8.
8	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.
8		No	Go to the next step.
9	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].)
9		No	DTC troubleshooting completed.