DTC P1562 [L3]


DTC P1562	PCM +BB (back-up battery) voltage low
DETECTION CONDITION	• PCM monitors voltage of back up battery positive at PCM terminal 2Z. If PCM detects battery positive terminal voltage below 2.5V for 2 s, 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


STEP	INSPECTION		ACTION
1	PERFORM DTC CONFIRMATION PROCEDURE • Perform DTC CONFIRMATION PROCEDURE. (See DTC CONFIRMATION PROCEDURE [L3].) • Is same DTC present?	Yes	Go to next step.
1		No	Intermittent concern exists. Go to INTERMITTENT CONCERN TROUBLESHOOTING procedure. (See INTERMITTENT CONCERN TROUBLESHOOTING [L3].)
2	INSPECT EEC FUSE • Turn ignition key to OFF. • Inspect EEC fuse for failure and proper installation. • Is fuse okay?	Yes	Go to step 5.
2		No	• If EEC fuse has melted down, then go to 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 continuity between EEC fuse terminal and body ground. • Is there continuity?	Yes	Repair or replace harness for short to ground and install new fuse, then go to Step 6.
3		No	Go to step 6.
4	INSPECT POOR CONNECTION OF PCM CONNECTOR • Disconnect PCM connector. • Inspect for poor connection (damaged, pulled-out terminals, corrosion, etc.). • Is there any malfunction?	Yes	Repair terminals, then go to Step 6.
4		No	Go to next step.
5	INSPECT MONITOR CIRCUIT FOR OPEN CIRCUIT • Disconnect battery cables. • Inspect continuity between EEC fuse terminal and PCM terminal 2Z (harness side). • Is there continuity?	Yes	Go to next step.
5		No	Repair or replace harness for open, then go to next step.
6	VERIFY TROUBLESHOOTING OF DTC P1562 COMPLETED • Make sure to reconnect all disconnected connectors. • Clear DTC from PCM memory using WDS or equivalent. • Perform KOEO/KOER self-test. (See KOEO/KOER SELF-TEST PROCEDURE [L3].) • Is same DTC present?	Yes	Replace PCM, then go to next step. (See PCM REMOVAL/INSTALLATION [L3].)
6		No	Go to next step.
7	VERIFY AFTER REPAIR PROCEDURE • Perform "After Repair Procedure". (See AFTER REPAIR PROCEDURE [L3].) • Is there any DTC present?	Yes	Go to applicable DTC troubleshooting. (See DTC TABLE [L3].)
7		No	Troubleshooting completed.