Power Control System: Diagnosis Subaru BRZ ZC

List Of Diagnostic Codes

How To Troubleshoot

1. Bring in the car Next
2. Phenomenon check Next
3. Check the diagnostic codes (Refer to «CHECKING/CLEARING DIAGNOSTIC CODES»(ref-619154-S20369051862014053000000) ) DTC check Clear diagnostic code Recheck the diagnostic codes. RESULT Result Go to Fault location confirmed A Fault location not confirmed B B: Go to Step 5 A: Go to Next Step
4. List of diagnostic codes (main inspection parts) or troubleshooting for each code RESULT Result Go to Code output present A No code output B A: Go to Step 7 B: Go to Step 6
5. Inspection with SSM3 (Refer to «DATA MONITOR/ACTIVE TEST»(ref-619154-S25509319092014053000000) ) Perform the ECM data monitor and the active test. RESULT Result Go to Fault location not confirmed A Fault location confirmed B B: Go to Step 7 A: Go to Next Step
6. Inspect the ECM terminal voltage and circuit (Refer to «ECM TERMINAL ARRANGEMENT»(ref-619154-S30622649202014053000000) ) Next
7. Repair faulty parts Next
8. Check the diagnostic codes (Refer to «CHECKING/CLEARING DIAGNOSTIC CODES»(ref-619154-S20369051862014053000000) ) Next: Completed

Checking/Clearing Diagnostic Codes

1. Checking diagnostic codes (with the SSM3) Turn the ignition switch to OFF. Connect the SSM3 to the DLC3. Turn the ignition to IG ON and use the SSM3 display to select [Each System Check] -->[Integ. unit mode] -->[Diagnostic Code(s) Display] to bring up the diagnostic code confirmation screen. Check the diagnostic codes.
2. Delete recorded diagnostic codes (with the SSM3). Turn the ignition switch to OFF. Connect the SSM3 to the DLC3. Turn the ignition to IG ON and use the SSM3 display to select [Each System Check] -->[Integ. unit mode] -->[Clear Memory]. Select [Deletion] to delete the diagnostic codes. CAUTION: If deletion is not possible, retry it after turning the ignition to IG OFF and then on again. Do not use the SSM3 to delete diagnostic codes until the cause of the trouble has been identified.

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1. Instrument panel junction block assembly, main body ECM (Network gateway computer). Measure the voltage and resistance between terminals. NOTE: This inspection is performed from the back side of the connector with the connector in a connected state. Terminal No. (Terminal code) Input/Output Item Measuring condition Criteria 3A-15 <-->Chassis ground Input Voltage IG ON 11 to 14V 3A-20 <-->Chassis ground Input Voltage IG ON 11 to 14V 3A-27 <-->Chassis ground Input Voltage Always 11 to 14V 3C-19 <-->Chassis ground Input Voltage Always 11 to 14V 3E-1 <-->Chassis ground Input Voltage Always 11 to 14V 3A-12 <-->Chassis ground - Resistance Always Less than 1 ohms 3A-13 <-->Chassis ground - Resistance Always Less than 1 ohms 3B-18 <-->Chassis ground - Resistance Always Less than 1 ohms D6-1 (GND) <-->Chassis ground - Resistance Always Less than 1 ohms A73-4 (GND) <-->Chassis ground - Resistance Always Less than 1 ohms Remove the instrument panel junction block assembly from the main body ECM (Network gateway computer). Measure the voltage and resistance between terminals. Terminal No. (Terminal code) Input/Output Item Measuring condition Criteria MB-1 (BECU) <-->Chassis ground Input Voltage Always 11 to 14V MB-8 (IG) <-->Chassis ground Input Voltage IG ON 11 to 14V MB-9 (ACC) <-->Chassis ground Input Voltage ACC ON 11 to 14V MB-32 (BMPX) <-->Chassis ground Input Voltage Always 11 to 14V MB-11 (GND) <-->Chassis ground - Resistance Always Less than 1 ohms

Data Monitor/Active Test

1. Data monitor list. Turn the ignition switch to OFF. Connect the SSM3 to the DLC3. Turn the ignition switch to ON. Follow the SSM3 display and select [Each System Check] -->[Integ. unit mode] -->[Current Data Display & Check] to bring up the data monitor item list. Use the data monitor to judge whether a component is working or not, and to narrow down the location of trouble. SSM3 SCREEN: [EACH SYSTEM CHECK] -->[INTEG. UNIT MODE] -->[CURRENT DATA DISPLAY & SAVE] Item name Description/display range Normal value Remarks (Main inspection items during a malfunction) [BATT voltage (control)] Shows the BATT (control) voltage. Display range: +0 - 21.4 V 11 to 14 V When a malfunction occurs, it may be due to a problem with battery voltage. [BATT voltage (BACKUP)] Shows the BATT voltage backup. Display range: 0 - 21.4 V 11 to 14 V When a malfunction occurs, it may be due to a problem with battery voltage. [ABS_CM Power Voltage] Shows the IG power supply voltage. Display range: 0 - 21.4 V 11 to 14 V When a malfunction occurs, it may be due to a problem with the IG circuit. [ACC voltage] Shows the ACC voltage. Display range: 0 - 21.4 V 11 to 14 V When a malfunction occurs, it may be due to a problem with the ACC circuit.

Circuit description

B1010 is output if there is a malfunction inside the main body ECM (Network gateway computer).

Inspection steps

1. Clear diagnostic code Clear the diagnostic code using the SSM3. (Refer to «CHECKING/CLEARING DIAGNOSTIC CODES»(ref-619154-S20369051862014053000000) ) Next
2. DTC check Use the SSM3 to confirm that diagnostic code B1010 is not being output again. (Refer to «CHECKING/CLEARING DIAGNOSTIC CODES»(ref-619154-S20369051862014053000000) ) RESULT Result Go to If the diagnostic code is being output again A If the diagnostic code is not output B B: Go to "How to simulate trouble phenomenon". (Refer to «PROCEDURES FOR MALFUNCTION PHENOMENON SIMULATION»(ref-619149-S40880751572014053000000) ) A: Replace the main body ECM (Network gateway computer) (Refer to «REMOVAL»(ref-619154-S18264387212014053000000) )

B1011 is output when a BMPX circuit malfunction is detected.

Note. If B1012 is output at the same time, there are some cases where all functions of the main body ECM (Network gateway computer) do not operate.

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1. Clear diagnostic code Clear the diagnostic code using the SSM3. (Refer to «CHECKING/CLEARING DIAGNOSTIC CODES»(ref-619154-S20369051862014053000000) ) Next
2. DTC check Use the SSM3 to confirm that diagnostic code B1011 is not being output again. (Refer to «CHECKING/CLEARING DIAGNOSTIC CODES»(ref-619154-S20369051862014053000000) ) RESULT Result Go to If the diagnostic code is being output again A If the diagnostic code is not output B B: Go to "How to simulate trouble phenomenon". (Refer to «PROCEDURES FOR MALFUNCTION PHENOMENON SIMULATION»(ref-619149-S40880751572014053000000) ) A: Go to Next Step
3. Inspect the wiring harness and connector (BMPX voltage) NOTE: For inspection procedures and precautions, please refer to «INSPECTION PROCEDURES FOR ELECTRICAL CIRCUITS AND HOW TO PERFORM»(ref-619149-S21627727182014053000000) . Disconnect the instrument panel junction block assembly connector 3C. Measure the voltage between the terminals. VOLTAGE Inspection terminals Inspection conditions Standard value 3C-19 - Chassis ground Always 11 to 14 V NG: Repair or replacement of wiring harness or connector OK: Go to Next Step
4. Inspect the wiring harness and connector (ECM ground) NOTE: For inspection procedures and precautions, please refer to «INSPECTION PROCEDURES FOR ELECTRICAL CIRCUITS AND HOW TO PERFORM»(ref-619149-S21627727182014053000000) . Disconnect the main body ECM (Network gateway computer) connectors D6 and A73. Disconnect the instrument panel junction block assembly connector 3B. Measure the resistance between the terminals. RESISTANCE Inspection terminals Inspection conditions Standard value D6-1 (GND) - Chassis ground Always Less than 1 ohms A73-4 (GND) - Chassis ground Always Less than 1 ohms 3B-18 - Chassis ground Always Less than 1 ohms NG: Repair or replacement of wiring harness or connector OK: Go to Next Step
5. Inspect the instrument panel junction block assembly itself Remove the instrument panel junction block assembly. (Refer to «REMOVAL»(ref-619154-S18264387212014053000000) ) Remove the instrument panel junction block assembly from the main body ECM (Network gateway computer). Measure the resistance between the terminals. RESISTANCE Inspection terminals Inspection conditions Standard value 3C-19 - MB-32 (BMPX) Always Less than 1 ohms 3B-18 - MB-11 (GND) Always Less than 1 ohms NG: Replace the instrument panel junction block assembly (Refer to «REMOVAL»(ref-619154-S18264387212014053000000) ) OK: Replace the main body ECM (Network gateway computer) (Refer to «REMOVAL»(ref-619154-S18264387212014053000000) )

B1012 is output when a BECU circuit malfunction is detected.

Note. If B1011 is output at the same time, there are some cases where all functions of the main body ECM (Network gateway computer) do not operate.

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1. Clear diagnostic code Clear the diagnostic code using the SSM3. (Refer to «CHECKING/CLEARING DIAGNOSTIC CODES»(ref-619154-S20369051862014053000000) ) Next
2. DTC check Use the SSM3 to confirm that diagnostic code B1012 is not being output again. (Refer to «CHECKING/CLEARING DIAGNOSTIC CODES»(ref-619154-S20369051862014053000000) ) RESULT Result Go to If the diagnostic code is being output again A If the diagnostic code is not output B B: Go to "How to simulate trouble phenomenon". (Refer to «PROCEDURES FOR MALFUNCTION PHENOMENON SIMULATION»(ref-619149-S40880751572014053000000) ) A: Go to Next Step
3. Inspect the wiring harness and connector (BECU voltage) NOTE: For inspection procedures and precautions, please refer to «INSPECTION PROCEDURES FOR ELECTRICAL CIRCUITS AND HOW TO PERFORM»(ref-619149-S21627727182014053000000) . Disconnect the instrument panel junction block assembly connector 3A. Measure the voltage between the terminals. VOLTAGE Inspection terminals Inspection conditions Standard value 3A-27 - Chassis ground Always 11 to 14 V NG: Repair or replacement of wiring harness or connector OK: Go to Next Step
4. Inspect the wiring harness and connector (ECM ground) (Refer to «INSPECTION STEPS»(ref-619154-S04608031112014053000000) ) NG: Repair or replacement of wiring harness or connector OK: Go to Next Step
5. Inspect the instrument panel junction block assembly itself Remove the instrument panel junction block assembly. (Refer to «REMOVAL»(ref-619154-S18264387212014053000000) ) Remove the instrument panel junction block assembly from the main body ECM (Network gateway computer). Measure the resistance between the terminals. RESISTANCE Inspection terminals Inspection conditions Standard value 3A-27 - MB-1 (BECU) Always Less than 1 ohms 3B-18 - MB-11 (GND) Always Less than 1 ohms NG: Replace the instrument panel junction block assembly (Refer to «REMOVAL»(ref-619154-S18264387212014053000000) ) OK: Replace the main body ECM (Network gateway computer) (Refer to «REMOVAL»(ref-619154-S18264387212014053000000) )

B1013 is output when an IG circuit malfunction is detected.

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1. Clear diagnostic code Clear the diagnostic code using the SSM3. (Refer to «CHECKING/CLEARING DIAGNOSTIC CODES»(ref-619154-S20369051862014053000000) ) Next
2. DTC check Use the SSM3 to confirm that diagnostic code B1013 is not being output again. (Refer to «CHECKING/CLEARING DIAGNOSTIC CODES»(ref-619154-S20369051862014053000000) ) RESULT Result Go to If the diagnostic code is being output again A If the diagnostic code is not output B B: Go to "How to simulate trouble phenomenon". (Refer to «PROCEDURES FOR MALFUNCTION PHENOMENON SIMULATION»(ref-619149-S40880751572014053000000) ) A: Go to Next Step
3. Inspect the wiring harness and connector (Power supply voltage) NOTE: For inspection procedures and precautions, please refer to «INSPECTION PROCEDURES FOR ELECTRICAL CIRCUITS AND HOW TO PERFORM»(ref-619149-S21627727182014053000000) . Disconnect the instrument panel junction block assembly connectors 3A and 3E. Measure the voltage between the terminals. Inspection terminals Inspection conditions Standard value 3A-15 - Chassis ground IG ON 11 to 14 V 3E-1 - Chassis ground Always 11 to 14 V NG: Repair or replacement of wiring harness or connector OK: Go to Next Step
4. Inspect the wiring harness and connector (Ground) NOTE: For inspection procedures and precautions, please refer to «INSPECTION PROCEDURES FOR ELECTRICAL CIRCUITS AND HOW TO PERFORM»(ref-619149-S21627727182014053000000) . Disconnect the main body ECM (Network gateway computer) connectors D6 and A73. Disconnect the instrument panel junction block assembly connectors 3A and 3B. Measure the resistance between the terminals. RESISTANCE Inspection terminals Inspection conditions Standard value D6-1 (GND) - Chassis ground Always Less than 1 ohms A73-4 (GND) - Chassis ground Always Less than 1 ohms 3A-12 - Chassis ground Always Less than 1 ohms 3A-13 - Chassis ground Always Less than 1 ohms 3B-18 - Chassis ground Always Less than 1 ohms NG: Repair or replacement of wiring harness or connector OK: Go to Next Step
5. Inspect the instrument panel junction block assembly itself Remove the instrument panel junction block assembly. (Refer to «REMOVAL»(ref-619154-S18264387212014053000000) ) Remove the instrument panel junction block assembly from the main body ECM (Network gateway computer). Measure the resistance between the terminals. RESISTANCE Inspection terminals Inspection conditions Standard value 3E-1 - MB-8 (IG) When battery voltage is not applied between terminals 3A-15 and 3A-12. 10 kohms or more 3E-1 - MB-8 (IG) When battery voltage is applied between terminals 3A-15 and 3A-12. Less than 1 ohms 3B-18 - MB-11 (GND) Always Less than 1 ohms NG: Replace the instrument panel junction block assembly (Refer to «REMOVAL»(ref-619154-S18264387212014053000000) ) OK: Replace the main body ECM (Network gateway computer) (Refer to «REMOVAL»(ref-619154-S18264387212014053000000) )

B1014 is output when an ACC circuit malfunction is detected.

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1. Clear diagnostic code Clear the diagnostic code using the SSM3. (Refer to «CHECKING/CLEARING DIAGNOSTIC CODES»(ref-619154-S20369051862014053000000) ) Next
2. DTC check Use the SSM3 to confirm that diagnostic code B1014 is not being output again. (Refer to «CHECKING/CLEARING DIAGNOSTIC CODES»(ref-619154-S20369051862014053000000) ) RESULT Result Go to If the diagnostic code is being output again A If the diagnostic code is not output B B: Go to "How to simulate trouble phenomenon". (Refer to «PROCEDURES FOR MALFUNCTION PHENOMENON SIMULATION»(ref-619149-S40880751572014053000000) ) A: Go to Next Step
3. Inspect the wiring harness and connector (Power supply voltage) NOTE: For inspection procedures and precautions, please refer to «INSPECTION PROCEDURES FOR ELECTRICAL CIRCUITS AND HOW TO PERFORM»(ref-619149-S21627727182014053000000) . Disconnect the instrument panel junction block assembly connectors 3A and 3E. Measure the voltage between the terminals. VOLTAGE Inspection terminals Inspection conditions Standard value 3A-20 - Chassis ground ACC ON 11 to 14 V 3E-1 - Chassis ground Always 11 to 14 V NG: Repair or replacement of wiring harness or connector OK: Go to Next Step
4. Inspect the wiring harness and connector (Ground) (Refer to «INSPECTION STEPS»(ref-619154-S05885034912014053000000) ) NG: Repair or replacement of wiring harness or connector
5. Inspect the instrument panel junction block assembly itself Remove the instrument panel junction block assembly. (Refer to «REMOVAL»(ref-619154-S18264387212014053000000) ) Remove the instrument panel junction block assembly from the main body ECM (Network gateway computer). Measure the resistance between the terminals. RESISTANCE Inspection terminals Inspection conditions Standard value 3E-1 - MB-9 (ACC) When battery voltage is not applied between terminals 3A-20 and 3A-12. 10 kohms or more 3E-1 - MB-9 (ACC) When battery voltage is applied between terminals 3A-20 and 3A-12. Less than 1 ohms 3B-18 - MB-11 (GND) Always Less than 1 ohms NG: Replace the instrument panel junction block assembly (Refer to «REMOVAL»(ref-619154-S18264387212014053000000) ) OK: Replace the main body ECM (Network gateway computer) (Refer to «REMOVAL»(ref-619154-S18264387212014053000000) )

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1. Precautions After turning the ignition switch to OFF, you may have to wait for a while before disconnecting the battery terminals. Check appropriate precautions for battery terminal disconnection before proceeding. (Refer to «WORKING PRECAUTIONS AND NOTES»(ref-619149-S01292846772014053000000) )
2. Remove the battery current sensor assembly. Disconnect the connector. Undo the nut and disconnect the engine wire from the battery current sensor assembly. CAUTION: The power windows are equipped with an index function that is linked to the opening and closing of the doors and allows the glass to be opened and closed a little. The molding may be damaged when the doors are opened or closed after disconnecting the battery ground terminal when the glass is completely closed. Therefore, always disconnect the battery ground terminal with the driver's or passenger's seat door open (with the glass lowered to a position that allows free door opening and closing). Loosen the nut and remove the battery current sensor assembly.