Pinpoint Test D: P0685, P068A, P06B8

WARNING: This page is about a different car, the 2022 Ford E-Transit. However, it is still accessible from the selected car via links, so may be relevant.

Refer to POWERTRAIN CONTROLS for schematic and connector information.

Normal Operation and Fault Conditions

Refer to the DTC Fault Trigger Conditions.

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
PCM P0685:00	ECM/PCM Power Relay Control Circuit/Open: No Sub Type Information	Sets when the ISP-R circuit indicates the ignition is in the OFF, ACC, or LOCK mode, and the amount of time the PCM remains powered through the PCM power relay exceeds a predetermined amount of time. Ability to communicate with the PCM when the ignition is in the OFF, ACC, or LOCK mode indicates a hard fault.
PCM P068A:00	ECM/PCM Power Relay De-Energized - Too Early: No Sub Type Information	Sets when the non volatile random access memory write did not complete successfully after the ignition key was turned OFF, prior to PCM shutdown. This DTC also sets when the PCM power relay is de-energized too early.
PCM P06B8:00	Internal Control Module Non-Volatile Random Access Memory (NVRAM) Error: No Sub Type Information	Sets when the PCM detects a concern with the ability of the PCM to correctly store permanent DTCs.

Possible Sources

PCM power circuitry concern
PCM power relay (12A646)
PCM (12A650)

D1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS)
- Using a diagnostic scan tool, retrieve all PCM DTCs.
Are DTCs P0685, P068A, or P06B8 present?

Yes For DTCs, P068A or P06B8 GO to D2 For all others, GO to D8

No GO to D3

D2 CHECK THE BATTERY AND CHARGING SYSTEM

Check the battery and charging system voltages. REFER to: Charging System - Electric

Are the battery and charging system voltages within specification?

Yes

GO to D3

No	REPAIR as necessary. Diagnose the system voltage low or battery is discharged symptom or the system voltage high symptom. REFER to: Charging System - Electric CLEAR the PCM DTCs. REPEAT the self-test.

D3 CHECK THE PCMRC CIRCUIT FOR AN OPEN

Ignition OFF.

Disconnect PCM C1232 .

Disconnect BJB C1035B .

Measure and record:

Positive Lead	Measurement / Action	Negative Lead
C1035B-46	Courtesy of FORD MOTOR COMPANY	C1232-J4

Is the resistance less than 3 ohms?

Yes

GO to D4

No	REPAIR the open circuit. CLEAR the PCM DTCs. REPEAT the self-test

D4 CHECK THE PCMRC CIRCUIT FOR A SHORT TO VOLTAGE

Ignition ON.

Measure and record:

Positive Lead	Measurement / Action	Negative Lead
C1232-J4	Courtesy of FORD MOTOR COMPANY	Ground

Is any voltage present?

Yes	REPAIR the short circuit. CLEAR the PCM DTCs. REPEAT the self-test

GO to D5

D5 CHECK THE ISP-R VOLTAGE AT THE PCM

NOTE: Check the connector pins for intermittent concerns.

Ignition OFF.

Disconnect PCM C1232 .

Connect BJB C1035B .

Ignition ON.

Measure and record:

Positive Lead	Measurement / Action	Negative Lead
C1232-K2	Courtesy of FORD MOTOR COMPANY	Ground

Is the voltage greater than 10.5 V?

Yes

GO to D6

No	REPAIR the open circuit. CLEAR the PCM DTCs. REPEAT the self-test

D6 CHECK THE VPWR CIRCUIT FOR AN OPEN

Ignition OFF.

Disconnect BJB C1035B .

Measure and record:

Positive Lead	Measurement / Action	Negative Lead
C1232-P4	Courtesy of FORD MOTOR COMPANY	C1035B-39
C1232-Q4	Courtesy of FORD MOTOR COMPANY	C1035B-39

Are the resistances less than 3 ohms?

Yes

GO to D7

No	REPAIR the open circuit. CLEAR the PCM DTCs. REPEAT the self-test

D7 CHECK THE BJB

Connect BJB C1035B .

Ignition OFF.

Connect a 5A fused jumper between:

Positive Lead	Measurement / Action	Negative Lead
C1232-J4	Courtesy of FORD MOTOR COMPANY	Ground

Ignition ON.

Measure and record:

Positive Lead	Measurement / Action	Negative Lead
C1232-P4	Courtesy of FORD MOTOR COMPANY	Ground
C1232-Q4	Courtesy of FORD MOTOR COMPANY	Ground

Is the voltage above 10.5 V?

Yes

GO to D11

No	INSTALL a new BJB. CLEAR the PCM DTCs. REPEAT the self-test

D8 CHECK THE PCMRC CIRCUIT FOR A SHORT TO GROUND

Ignition OFF.

Disconnect PCM C1232 .

Disconnect BJB C1035B .

Measure and record:

Positive Lead	Measurement / Action	Negative Lead
C1232-J4	Courtesy of FORD MOTOR COMPANY	C1035B-46

Is the resistance greater than 3 ohms?

Yes

GO to D9

No	REPAIR the short circuit. CLEAR the PCM DTCs. REPEAT the self-test

D9 CHECK THE PCMRC CIRCUIT FOR AN OPEN

Measure and record:

Positive Lead	Measurement / Action	Negative Lead
C1232-J4	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance greater than 10 kOhms?

Yes

GO to D10

No	REPAIR the short circuit. CLEAR the PCM DTCs. REPEAT the self-test

D10 CHECK THE ISP-R CIRCUIT FOR A SHORT TO VOLTAGE

Ignition OFF.

Measure and record:

Positive Lead	Measurement / Action	Negative Lead
C1232-K2	Courtesy of FORD MOTOR COMPANY	Ground

Is any voltage present?

Yes	REPAIR the short circuit. CLEAR the PCM DTCs. REPEAT the self-test

GO to D11

D11 CHECK FOR CORRECT PCM OPERATION
- Ignition OFF.
- Disconnect and inspect all PCM connectors.
- Repair:
  - corrosion
    - install new connector or terminals
    - clean module pins
  - damaged or bent pins
    - install new terminals/pins
  - pushed-out pins
    - install new pins as necessary
- Reconnect the PCM connectors. Make sure they seat and latch correctly.
- Start the engine.
- Using a diagnostic scan tool, run the PCM self-test.
- Verify the concern is still present
Is the concern still present?

Yes INSTALL a new PCM. Refer to Powertrain Control Module (PCM) .

No The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.