DTC P1566 (GENERAL (L.H.D.) SPECS. SPORT AT) [FN4A-EL]

id0502a18103a7

DTC P1566

TCM +BB voltage low

DETECTION CONDITION

• The TCM monitors the voltage of back-up battery positive terminal at TCM terminal 1K. If the TCM detected battery positive terminal voltage below 2.5 V for 2 s, the TCM determines that the backup voltage circuit has malfunction.
Diagnostic support note
• This is a continuous monitor (CCM).
• MIL illuminates if TCM detects the above malfunction condition during first drive cycle.
• PENDING CODE is available if TCM detects the above malfunction condition.
• FREEZE FRAME DATA is available.
• DTC is stored in the TCM memory.

POSSIBLE CAUSE

• Melt down EEC fuse.
• Open circuit in wiring between EEC fuse and TCM terminal 1K
• Short to ground between EEC fuse and TCM terminal 1K
• Poor connection of TCM connector.
• TCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1
VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
• Has FREEZE FRAME PID DATA been recorded?
Yes
Go to next step.
No
Record FREEZE FRAME PID DATA on repair order, then go to next step.
2
VERIFY RELATED REPAIR INFORMATION AVAILABILITY
• Check for related Service Bulletins and/or on-line repair information availability.
• Is any related repair information available?
Yes
Perform repair or diagnosis according to available repair information.
• If vehicle is not repaired, go to next step.
No
Go to next step.
3
INSPECT EEC FUSE
• Turn ignition key to OFF.
• Inspect EEC fuse for failure and proper.
• Is it okay?
Yes
Go to step 6.
No
• If EEC fuse has been melt down, then go to 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 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 7.
No
Go to step 7.
5
INSPECT TCM CONNECTOR FOR POOR CONNECTION
• Disconnect TCM connector.
• Inspect for poor connection (such as damaged, pulled-out terminals, corrosion).
• Are there any malfunctions?
Yes
Repair terminals, then go to Step 7.
No
Go to next step.
6
INSPECT MONITOR CIRCUIT FOR OPEN CIRCUIT
• Disconnect battery cables.
• Inspect continuity between EEC fuse terminal and TCM terminal 1K (harness-side).
• Is there any continuity?
Yes
Go to next step.
No
Repair or replace harness for open, then go to next step.
7
VERIFY TROUBLESHOOTING OF DTC P1566 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Turn ignition key to ON (Engine OFF).
• Clear DTC from TCM memory using WDS or equivalent.
• Start engine and warm it up completely.
• Is same DTC present?
Yes
Replace TCM, then go to next step.
No
Go to next step.
8
VERIFY AFTER REPAIR PROCEDURE
• Perform "After Repair Procedure".
• Are any DTC present?
Yes
Go to applicable DTC inspection.
No
Troubleshooting completed.