DTC P1562 [L3]

BME010201500202

DTC P1562

PCM +BB (back-up battery) voltage low

DETECTION CONDITION

• The PCM monitors the voltage of back up battery positive at PCM terminal 2Z. If PCM detects battery positive terminal voltage below 2.5V for 2 s, the PCM determines that back up 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.
• FREEZE FRAME DATA is available.
• DTC is stored in the PCM memory.

POSSIBLE CAUSE

• Melted EEC fuse
• Open circuit in wiring EEC fuse and PCM terminal 2Z
• Poor connection of PCM connector.
• PCM malfunction
• Short to ground between EEC fuse and PCM terminal 2Z

Diagnostic procedure

STEP

INSPECTION

ACTION

1
PERFORM DTC CONFIRMATION PROCEDURE
• Perform DTC CONFIRMATION PROCEDURE.
• Is same DTC present?
Yes
Go to the next step.
No
Intermittent concern exists. Go to INTERMITTENT CONCERN TROUBLESHOOTING procedure.
2
INSPECT EEC FUSE
• Turn the ignition switch off.
• Inspect EEC fuse for failure and proper installation.
• Is fuse normal?
Yes
Go to step 5.
No
• If EEC fuse has melted down, then go to the next step.
• If EEC fuse is not installed correctly, install it correctly then go to Step 6.
3
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 6.
No
Go to step 6.
4
INSPECT POOR CONNECTION OF PCM CONNECTOR
• Disconnect the PCM connector.
• Inspect for poor connection (such as damaged/pulled-out terminals, corrosion).
• Is there any malfunction?
Yes
Repair the terminals, then go to Step 6.
No
Go to the next step.
5
INSPECT MONITOR CIRCUIT FOR OPEN CIRCUIT
• Disconnect battery cables.
• Inspect for continuity between EEC fuse terminal and PCM terminal 2Z (wiring harness side).
• 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.
6
VERIFY TROUBLESHOOTING OF DTC P1562 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear the DTC from the PCM memory using the WDS or equivalent.
• Perform KOEO/KOER self-test.
• Is the same DTC present?
Yes
Replace the PCM, then go to the next step.
No
Go to the next step.
7
VERIFY AFTER REPAIR PROCEDURE
• Perform "After Repair Procedure".
• Is there any DTC present?
Yes
Go to the applicable DTC inspection.
No
Troubleshooting completed.