Pinpoint Test Ar: P1A07

NOTE: The Inverter System Controller (ISC) is referred to as the SOBDMC (Secondary On-Board Diagnostic Control Module C) in the scan tool.

Normal Operation and Fault Conditions

REFER to: Electric Powertrain Control - System Operation and Component Description .

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 Causes

Depleted high voltage battery
High voltage battery fuse
High voltage battery system DTC s
High voltage cable connections
BECM

AR1 VISUAL INSPECTION OF THE HIGH VOLTAGE SYSTEM

Ignition OFF.

Depower the high voltage system. REFER to: High Voltage System De-energizing .

Remove the Inverter System Controller (ISC) side cover. When removing side cover, pull cover straight out approximately 2 inches before moving upwards or damage to the high voltage interlock connector may occur. REFER to: Inverter System Controller [SOBDMC] .

Courtesy of FORD MOTOR COMPANY

Examine all the high voltage connections for damage and loose or broken conditions.

Verify the high voltage terminal bolts are fully seated and torqued to 12 Nm

Courtesy of FORD MOTOR COMPANY

Is a concern present?

Yes	REPAIR as necessary. CLEAR the Inverter System Controller (ISC) DTC s and REPEAT the self-test.

GO to AR2

AR2 VERIFY THE HIGH VOLTAGE TRACTION BATTERY STATE OF CHARGE

Install the Inverter System Controller (ISC) side cover. REFER to: Inverter System Controller [SOBDMC] .

Connect all previously disconnected connectors.

Re-energize the high voltage system. REFER to: High Voltage System De-energizing .

Ignition ON.

Access the SOBDMC and monitor the HVBAT_V (V) PID

Is the voltage greater than 120 volts for HEV or 168 volts for PHEV '

Yes

GO to AR3

No	CHARGE the high voltage traction battery. REFER to: High Voltage Battery Charging - Full Hybrid Electric Vehicle (FHEV) . CLEAR the Inverter System Controller (ISC) DTC s. REPEAT the self-test.

AR3 VERIFY CONCERN IS PRESENT

NOTE: Clearing the Inverter System Controller (ISC) Diagnostic Trouble Codes (DTCs) will erase any Inverter System Controller (ISC) recorded freeze frame data. Make sure to 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.
- CLEAR the Inverter System Controller (ISC) DTC s.
- CARRY out the Inverter System Controller (ISC) self-test.
Is DTC P1A07 present?

Yes GO to AR4

No GO to AR7

AR4 CHECK THE HIGH VOLTAGE POSITIVE CABLE FOR AN OPEN

Ignition OFF.

Depower the high voltage system. REFER to: High Voltage System De-energizing .

Disconnect High Voltage BJB For HEV C4236D, For PHEV C494.

Disconnect Inverter System Controller (ISC) C199C.

Measure and record:

For HEV

Positive Lead	Measurement / Action	Negative Lead
C4236D Pin 3	Courtesy of FORD MOTOR COMPANY	C199C Pin 1
C4236D Pin 4	Courtesy of FORD MOTOR COMPANY	C199C Pin 4

For PHEV

Positive Lead	Measurement / Action	Negative Lead
C494 Pin 4	Courtesy of FORD MOTOR COMPANY	C199C Pin 1
C494 Pin 1	Courtesy of FORD MOTOR COMPANY	C199C Pin 4

Is the resistance less than 5 ohms?

Yes

GO to AR5

No	INSTALL a new High Voltage Cable from the Inverter System Controller (ISC) to the traction battery. REFER to: HIGH VOLTAGE BATTERY CABLES - PLUG-IN HYBRID ELECTRIC VEHICLE (PHEV) . CLEAR the Inverter System Controller (ISC) DTC s. REPEAT the self-test.

AR5 CHECK THE HIGH VOLTAGE CABLES FOR A SHORT FROM POSTIVE TO NEGATIVE

Ignition OFF.

For HEV, measure and record:

Positive Lead	Measurement / Action	Negative Lead
C4236D Pin 3	Courtesy of FORD MOTOR COMPANY	C4236D Pin 4

For PHEV, measure and record:

Positive Lead	Measurement / Action	Negative Lead
C494 Pin 1	Courtesy of FORD MOTOR COMPANY	C494 Pin 4

Is the resistance below 10K ohms?

Yes	INSTALL a new High Voltage Cable from the Inverter System Controller (ISC) to the traction battery. REFER to: HIGH VOLTAGE BATTERY CABLES - PLUG-IN HYBRID ELECTRIC VEHICLE (PHEV) . CLEAR the Inverter System Controller (ISC) DTC s. REPEAT the self-test.

GO to AR6

AR6 CHECK THE BECM (BATTERY ENERGY CONTROL MODULE) FOR VOLTAGE MISMATCH

Ignition ON.

CLEAR the Inverter System Controller (ISC) DTC s.

Ignition OFF.

Wait 5 minutes.

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 AR7

No	INSTALL a new BECM. REFER to: Battery Energy Control Module (BECM) - Plug-In Hybrid Electric Vehicle (PHEV) . CLEAR the Inverter System Controller (ISC) DTC s. REPEAT the self-test.

AR7 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 For HEV C4236D, For PHEV C494.
- Connect Inverter System Controller (ISC) C199C.
- Repower the high voltage system. REFER to: High Voltage System De-energizing .
- 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.