DTC P1246 [YF (2.0L Zetec)]

id0102d0843800

DTC P1246

Generator load input problem

DETECTION CONDITION

• PCM judges generator output voltage is not within threshold during engine running.

POSSIBLE CAUSE

• Generator malfunction
• PCM and/or generator are poorly connected
• Open and/or short to GND in wiring from between generator terminal 1 and PCM terminal 59
• Drive belt misadjustment

Diagnostic procedure

STEP

INSPECTION

ACTION

1
VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
• Has FREEZE FRAME DATA been recorded?
Yes
Go to the next step.
No
Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2
VERIFY RELATED REPAIR INFORMATION AVAILABILITY
• Verify related service repair information availability.
• Is any related repair information available?
Yes
Perform repair or diagnosis according to the available repair information.
• If the vehicle is not repaired, go to the next step.
No
Go to the next step.
3
INSPECT DRIVE BELT CONDITION
• Verify that drive belt auto tensioner indicator mark does not exceed limit.
• Is front drive belt normal?
Yes
Go to the next step.
No
Replace and/or adjust drive belt, then go to Step 8.
4
INSPECT POOR CONNECTION OF PCM CONNECTOR
• Turn the ignition switch to off.
• Disconnect PCM connector.
• Inspect for poor connection (damaged, pulled-out terminals, corrosion, etc.).
• Is there a malfunction?
Yes
Repair terminals, then go to Step 8.
No
Go to the next step.
5
INSPECT POOR CONNECTION OF GENERATOR CONNECTOR
• Disconnect generator connector.
• Inspect for poor connection (damaged, pulled-out terminals, corrosion, etc.).
• Is there a malfunction?
Yes
Repair or replace terminals, then go to Step 8.
No
Go to the next step.
6
INSPECT GENERATOR CONTROL CIRCUIT FOR SHORT TO GROUND
• Inspect for continuity between generator terminal 1 (wiring harness-side) and body ground.
• Is there continuity?
Yes
Repair or replace wiring harness for short to ground, then go to Step 8.
No
Go to the next step.
7
INSPECT GENERATOR CONTROL CIRCUIT FOR OPEN
• Inspect for continuity between generator terminal 1 (wiring harness-side) and PCM terminal 59 (wiring harness-side).
• Is there continuity?
Yes
Go to the next step.
No
Repair or replace wiring harness for open circuit, then go to the next step.
8
VERIFY TROUBLESHOOTING OF DTC P1246 COMPLETED
• Make sure to reconnect all connectors.
• Clear DTC from PCM memory using WDS or equivalent.
• Start the engine.
• Is the same DTC present?
Yes
Replace PCM, then go to the next step.
No
Go to the next step.
9
VERIFY AFTER REPAIR PROCEDURE
• Perform "AFTER REPAIR PROCEDURE".
• Is there any DTC present?
Yes
Go to applicable DTC troubleshooting.
No
Troubleshooting completed.