Mazda 2002 6 Workshop Manual page 295

DTC P1562 PCM +BB (back-up battery) voltage low
Diagnostic procedure
STEP
1 PERFORM DTC CONFIRMATION PROCEDURE
• Perform DTC CONFIRMATION PROCEDURE.
(See F–66 DTC CONFIRMATION
PROCEDURE.)
• Is same DTC present?
2 INSPECT EEC FUSE
• Turn ignition key to OFF.
• Inspect EEC fuse for failure and proper.
• Is it okay?
3 INSPECT MONITOR CIRCUIT FOR SHORT TO
GROUND
• Disconnect battery cables.
• Inspect continuity between EEC fuse terminal
and body ground.
• Is there continuity?
4 INSPECT POOR CONNECTION OF PCM
CONNECTOR
• Disconnect PCM connector.
• Inspect for poor connection (damaged, pulled-
out terminals, corrosion, etc.).
• Are there any malfunctions?
5 INSPECT MONITOR CIRCUIT FOR OPEN
CIRCUIT
• Disconnect battery cables.
• Inspect continuity between EEC fuse terminal
and PCM terminal 2Z (harness side).
• Is there any continuity?
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 F–66 KOEO/KOER
• Is same DTC present?
ON-BOARD DIAGNOSTIC
INSPECTION
SELF-TEST.)
Yes Go to next step.
No Intermittent concern exists. Go to INTERMITTENT
CONCERN TROUBLESHOOTING procedure.
(See F–227 INTERMITTENT CONCERN
TROUBLESHOOTING.)
Yes Go to step 5.
• If EEC fuse has been melt down, then go to next step.
No
• If EEC fuse is not installed correctly, install it correctly
then go to Step 6.
Yes Repair or replace harness for short to ground and install
new fuse, then go to Step 6.
No Go to step 6.
Yes Repair terminals, then go to Step 6.
No Go to next step.
Yes Go to next step.
No Repair or replace harness for open, then go to next step.
Yes Replace PCM, then go to next step.
(See F–43 PCM REMOVAL/INSTALLATION.)
No Go to next step.
ACTION
F–165
F