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DTC P1562 [L3]

BME010201500202

DTC P1562 | PCM +BB (back-up battery) voltage low
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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
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1 | PERFORM DTC CONFIRMATION PROCEDURE • Perform DTC CONFIRMATION PROCEDURE. (See DTC CONFIRMATION PROCEDURE [L3].) • Is same DTC present? | Yes | Go to the next step.
No | Intermittent concern exists. Go to INTERMITTENT CONCERN TROUBLESHOOTING procedure. (See INTERMITTENT CONCERN TROUBLESHOOTING [L3].)
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. (See KOEO/KOER SELF-TEST PROCEDURE [L3].)
• Is the same DTC present?
Yes
Replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION [L3].)
No | Go to the next step.
7 | VERIFY AFTER REPAIR PROCEDURE • Perform "After Repair Procedure". (See AFTER REPAIR PROCEDURE [L3].) • Is there any DTC present? | Yes | Go to the applicable DTC inspection. (See DTC TABLE [L3].)
No | Troubleshooting completed.