DTC P1562 [AJ]

BME010201500201

DTC P1562

PCM +BB (back-up battery) voltage low

DETECTION CONDITION

• The PCM monitors the voltage of back-up battery positive terminal at PCM terminal 55. If the PCM detected battery positive terminal voltage below 2.5 V for 2 s, the PCM determines that the backup voltage circuit has malfunction.
Diagnostic support note
• This is a continuous monitor (CCM).
• MIL illuminates if PCM detects the above malfunction condition during first drive cycle.
• PENDING CODE is available if PCM detects the above malfunction condition during first drive cycle.
• FREEZE FRAME DATA is available.
• DTC is stored in the PCM memory.

POSSIBLE CAUSE

• Meltdown ROOM fuse.
• Open circuit in wiring between battery positive terminal and PCM terminal 55
• Poor connection of PCM connector.
• PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1
VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
• Has FREEZE FRAME DATA been recorded?
Yes
Go to the next step.
No
Record FREEZE FRAME DATA on repair order, then go to the next step.
2
VERIFY RELATED SERVICE INFORMATION AVAILABILITY
• Check for related Service Information availability.
• Is any related Service Information available?
Yes
Perform repair or diagnosis according to available Service Information.
• If vehicle is not repaired, go to the next step.
No
Go to the next step.
3
INSPECT ROOM FUSE
• Turn the ignition switch off.
• Inspect EEC fuse for failure and proper.
• Is it normal?
Yes
Go to step 5.
No
• If EEC fuse has been melt down, then go to the next step.
• If EEC fuse is not installed correctly, install it correctly then go to Step 7.
4
INSPECT MONITOR CIRCUIT FOR SHORT TO GROUND
• Disconnect battery cables.
• Inspect for continuity between EEC fuse terminal and body ground.
• Is there continuity?
Yes
Repair or replace the wiring harness for short to ground and install new fuse, then go to Step 7.
No
Go to step 7.
5
INSPECT PCM CONNECTOR FOR POOR CONNECTION
• Disconnect PCM connector.
• Inspect for poor connection (damaged, pulled-out terminals, corrosion, etc.).
• Is there any malfunction?
Yes
Repair terminals, then go to Step 7.
No
Go to the next step.
6
INSPECT MONITOR CIRCUIT FOR OPEN CIRCUIT
• Disconnect battery cables.
• Disconnect the PCM connector.
• Inspect for continuity between EEC fuse terminal and PCM terminal 55.
• Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness for open circuit, then go to the next step.
7
VERIFY TROUBLESHOOTING OF DTC P1562 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Turn the ignition switch off, then start engine.
• Is the PENDING CODE of same DTC present?
Yes
Replace the PCM, then go to the next step.
No
Go to the next step.
8
VERIFY AFTER REPAIR PROCEDURE
• Perform "After Repair Procedure".
• Is there any DTC present?
Yes
Go to the applicable DTC inspection.
No
Troubleshooting completed.