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DTC P1562

id010200023200

DTC P1562 | PCM +BB (back-up battery) voltage low
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DETECTION CONDITION | • The PCM monitors the voltage of the back-up battery positive at PCM terminal 1AX. If the PCM detects that the battery positive terminal voltage is 2.5V or less for 2 s, the PCM determines that the backup voltage circuit has a malfunction. Diagnostic support note • This is a continuous monitor (CCM). • The MIL illuminates if PCM detects the above malfunction condition during the first drive cycle. • The PENDING CODE is available if the PCM detects the above malfunction condition. • The FREEZE FRAME DATA is available • The DTC is stored in the PCM memory.
POSSIBLE CAUSE | • Melted EGI COMP1 fuse • Open circuit in wiring between EGI COMP1 fuse and PCM terminal 1AX • Short to ground between EGI COMP1 fuse and PCM terminal 1AX • Poor connection of PCM connector • PCM malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | PERFORM DTC CONFIRMATION PROCEDURE • Perform the DTC CONFIRMATION PROCEDURE. (See DTC CONFIRMATION PROCEDURE.) • Is the same DTC present? | Yes | Go to the next step.
No | Intermittent concern exists. Go to the INTERMITTENT CONCERN TROUBLESHOOTING procedure. (See INTERMITTENT CONCERN TROUBLESHOOTING.)
2 | INSPECT EGI COMP1 FUSE • Turn the ignition switch off. • Inspect the EGI COMP1 fuse for failure and proper installation. • Is it normal? | Yes | Go to step 5.
No | • If the EGI COMP1 fuse has melted, then go to the next step. • If the EGI COMP1 fuse is not installed correctly, install it correctly then go to Step 6.
3 | INSPECT MONITOR CIRCUIT FOR SHORT TO GROUND • Disconnect the battery cables. • Inspect for continuity between the EGI COMP1 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 PCM FOR POOR CONNECTION • Disconnect the PCM connector. • Inspect for poor connection (such as damaged, pulled-out pins, and 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 the EGI COMP1 fuse terminal and PCM terminal 1AX (wiring harness-side). • Is there continuity? | Yes | Go to the next step.
No | Repair or replace the wiring harness for an 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 the KOEO/KOER self-test. (See KOEO/KOER SELF-TEST.) • Is the same DTC present? | Yes | Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION.)
No | Go to the next step.
7 | VERIFY AFTER REPAIR PROCEDURE • Perform the "AFTER REPAIR PROCEDURE". (See AFTER REPAIR PROCEDURE.) • Are any DTCs present? | Yes | Go to the applicable DTC troubleshooting. (See DTC TABLE.)
No | Troubleshooting completed.