Pinpoint Test AY: P1A07

WARNING: This page is about a different car, the 2021 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.

Normal Operation and Fault Conditions

REFER to: Electric Powertrain Control - Component Location .

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
SOBDMC P1A07:00	Inverter High Voltage Performance: No Sub Type Information	This DTC sets when the powertrain is trying to protect the battery hardware from extreme voltage (high or low).

Possible Sources

Depleted high voltage battery
High voltage battery fuse
High voltage battery system DTCs
High voltage BJB connections
BECM

AY1 VISUAL INSPECTION OF THE HIGH VOLTAGE SYSTEM
- Ignition OFF.
- Depower the high voltage battery. REFER to: High Voltage System De-energizing .
- Visually inspect all the high voltage cables.
- Make sure all the high voltage connectors are correctly and securely connected.
- Examine all the high voltage cables and connectors for damaged, burned or overheated insulation and loose or broken connections.
Is a concern present?

Yes REPAIR as necessary. CLEAR the DTCs and REPEAT the self-test.

No GO to AY2

AY2 VERIFY THE HIGH VOLTAGE TRACTION BATTERY STATE OF CHARGE

Ignition ON.

Access the SOBDMC and monitor the HVBAT_V (V) PID.

Is the voltage greater than 200 volts for HEV and 250 volts for PHEV?

Yes

GO to AY3

No	CHARGE the high voltage traction battery. REFER to: High Voltage Battery Charging . CLEAR the Inverter System Controller (ISC) DTCs. REPEAT the self-test.

AY3 CHECK FOR BECM (BATTERY ENERGY CONTROL MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)
- Using a diagnositc scan tool, perform the BECM self-test.
Are DTCs P0A7D or P0DE6 present in the BECM?

Yes DIAGNOSE the BECM DTC's. REFER to: High Voltage Battery, Mounting and Cables .

No GO to AY4

AY4 VERIFY CONCERN IS PRESENT

NOTE: Clearing the Inverter System Controller (ISC) Diagnostic Trouble Codes (DTCs) erases any Inverter System Controller (ISC) recorded freeze frame data. Record any Inverter System Controller (ISC) freeze frame information before proceeding any further. Refer to the scan tool instruction manual for freeze frame Parameter Identification (PID) menu.
- Install the high voltage traction battery service disconnect plug.
- Ignition ON.
- Clear the Inverter System Controller (ISC) DTCs.
- Carry out the Inverter System Controller (ISC) self-test.
Is DTC P1A07 present?

Yes GO to AY5

No GO to AY7

AY5 CHECK THE HIGH VOLTAGE POSITIVE CABLE FOR AN OPEN

Ignition OFF.

Disconnect High Voltage BJB C4236D.

Disconnect Inverter System Controller (ISC) C1458C.

Measure and record:

Positive Lead	Measurement / Action	Negative Lead
C4236D-3	Courtesy of FORD MOTOR COMPANY	C1458C-1
C4236D-4	Courtesy of FORD MOTOR COMPANY	C1458C-4

Are the resistances less than 5 ohms?

Yes

GO to AY6

No	INSTALL a new high voltage cable from the Inverter System Controller (ISC) to the traction battery. REFER to: High Voltage Battery Cables . CLEAR the Inverter System Controller (ISC) DTCs. REPEAT the self-test.

AY6 CHECK THE BECM (BATTERY ENERGY CONTROL MODULE) FOR VOLTAGE MISMATCH

Ignition ON.

Clear the Inverter System Controller (ISC) DTCs.

Ignition OFF.

Ignition ON.

Wait for 5 seconds.

Access the BECM and monitor the HVBAT_V (V) PID.

Access the BECM and monitor the CONVOLTPOS (V) PID.

Are the PID voltages within 20 volts of each other?

Yes

GO to AY7

No	INSTALL a new BECM. REFER to: Battery Energy Control Module (BECM) . CLEAR the Inverter System Controller (ISC) DTCs. REPEAT the self-test.

AY7 CHECK THE HIGH VOLTAGE CABLES FOR AN INTERMITTENT CONCERN
- Ignition OFF.
- 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
- Connect High Voltage BJB C4236D.
- Connect Inverter System Controller (ISC) C1458C.
- Install the high voltage traction battery service disconnect plug.
- Ignition ON.
- Access the SOBDMC and monitor the GEN_INV_V (V) PID
- Carefully wiggle all accessible wiring and connectors associated with the high voltage cable from the Inverter System Controller (ISC) to the traction battery, and look for a change in the PID state.
Is a concern present during the wiggle or drive cycle test?

Yes REPAIR as necessary.

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