Pinpoint Test Bx : P0726:62

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 P0726:62	Engine Speed Input Circuit Range/Performance: Signal Compare Failure	This DTC sets when a CKP fault is detected while the engine is running.

Possible Sources

CKP sensor/wiring
CMP sensor/wiring
Wiring, terminals or connectors
ECM

BX1 CHECK FOR ECM (ENGINE CONTROL MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)

Ignition ON.

Using a diagnostic scan tool, perform the ECM self-test.

Are any CKP or CMP DTCs present in the ECM?

Yes	DIAGNOSE CKP or CMP DTCs. Refer to ENGINE CONTROLS - POWERTRAIN DTC CHARTS & DESCRIPTIONS (HYBRID) , to continue diagnostics.

GO to BX2

BX2 CHECK FOR INVERTER SYSTEM CONTROLLER (ISC) DIAGNOSTIC TROUBLE CODES (DTCS)
- Ignition ON.
- Using a diagnostic scan tool, perform the Inverter System Controller (ISC) self-test.
Is DTC P1A0C present in the Inverter System Controller (ISC)?

Yes DIAGNOSE DTC P1A0C GO to Pinpoint Test CV

No GO to BX3

BX3 CHECK THE CLEAN TACHOMETER OUTPUT (CTO) CIRCUIT FOR AN OPEN

Ignition OFF.

Disconnect Inverter System Controller (ISC) C199A.

Disconnect ECM C1381B.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C199A-2	Courtesy of FORD MOTOR COMPANY	C1381B-69

Is the resistance below 5 ohms?

Yes

GO to BX4

No	With the aid of the wiring diagram, REPAIR the open circuit.

BX4 CHECK THE CLEAN TACHOMETER OUTPUT (CTO) CIRCUIT FOR A SHORT TO GROUND

Measure:

Positive Lead	Measurement / Action	Negative Lead
C199A-2	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance greater than 10K ohms?

Yes

GO to BX5

No	With the aid of the wiring diagram, REPAIR the short circuit.

BX5 CHECK THE CLEAN TACHOMETER OUTPUT (CTO) CIRCUIT FOR A SHORT TO VOLTAGE

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C199A-2	Courtesy of FORD MOTOR COMPANY	Ground

Is any voltage present?

Yes	With the aid of the wiring diagram, REPAIR the short circuit.

GO to BX6

BX6 CHECK THE CKP (CRANKSHAFT POSITION) SENSOR CIRCUITS FOR AN OPEN

Ignition OFF.

Disconnect CKP C101.

Disconnect ECM C1381E.

Measure and record:

Positive Lead	Measurement / Action	Negative Lead
C101-1	Courtesy of FORD MOTOR COMPANY	C1381E-11
C101-2	Courtesy of FORD MOTOR COMPANY	C1381E-60
C101-3	Courtesy of FORD MOTOR COMPANY	C1381E-59

Is the resistance below 5 ohms?

Yes

GO to BX7

No	With the aid of the wiring diagram, REPAIR the open circuit.

BX7 CHECK THE CKP (CRANKSHAFT POSITION) SENSOR CIRCUITS FOR A SHORT TO GROUND

Measure and record:

Positive Lead	Measurement / Action	Negative Lead
C1381E-11	Courtesy of FORD MOTOR COMPANY	Ground
C1381E-60	Courtesy of FORD MOTOR COMPANY	Ground
C1381E-59	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance above 10K ohms?

Yes

GO to BX8

No	With the aid of the wiring diagram, REPAIR the open circuit.

BX8 CHECK THE CKP (CRANKSHAFT POSITION) SENSOR CIRCUITS FOR A SHORT TO VOLTAGE

Ignition ON.

Measure and record:

Positive Lead	Measurement / Action	Negative Lead
C1381E-11	Courtesy of FORD MOTOR COMPANY	Ground
C1381E-60	Courtesy of FORD MOTOR COMPANY	Ground
C1381E-59	Courtesy of FORD MOTOR COMPANY	Ground

Is any voltage present?

Yes	With the aid of the wiring diagram, REPAIR the short circuit. CLEAR the Inverter System Controller (ISC) DTCs and REPEAT the self-test.

GO to BX9

BX9 CHECK THE CMP (CAMSHAFT POSITION) SENSOR CIRCUITS FOR AN OPEN

Ignition OFF.

Disconnect CMP C1366.

Measure and record:

Positive Lead	Measurement / Action	Negative Lead
C1366-1	Courtesy of FORD MOTOR COMPANY	C1381E-45
C1366-2	Courtesy of FORD MOTOR COMPANY	C1381E-44
C1366-3	Courtesy of FORD MOTOR COMPANY	C1381E-17

Is the resistance below 5 ohms?

Yes	GO to BX10

No	With the aid of the wiring diagram, REPAIR the open circuit.

BX10 CHECK THE CMP (CAMSHAFT POSITION) SENSOR CIRCUITS FOR A SHORT TO GROUND

Measure and record:

Positive Lead	Measurement / Action	Negative Lead
C1381E-45	Courtesy of FORD MOTOR COMPANY	Ground
C1381E-44	Courtesy of FORD MOTOR COMPANY	Ground
C1381E-17	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance above 10K ohms?

Yes	GO to BX11

No	With the aid of the wiring diagram, REPAIR the open circuit.

BX11 CHECK THE CMP (CAMSHAFT POSITION) SENSOR CIRCUITS FOR A SHORT TO VOLTAGE

Ignition ON.

Measure and record:

Positive Lead	Measurement / Action	Negative Lead
C1381E-45	Courtesy of FORD MOTOR COMPANY	Ground
C1381E-44	Courtesy of FORD MOTOR COMPANY	Ground
C1381E-17	Courtesy of FORD MOTOR COMPANY	Ground

Is any voltage present?

Yes	With the aid of the wiring diagram, REPAIR the short circuit. CLEAR the Inverter System Controller (ISC) DTCs and REPEAT the self-test.

No	GO to BX12

BX12 CHECK THE INVERTER SYSTEM CONTROLLER (ISC) DIAGNOSTIC TROUBLE CODES (DTCS)

Reconnect all previously disconnected connectors.

Ignition ON.

CLEAR the Inverter System Controller (ISC) DTCs.

Start the engine.

Force the engine on (apply accelerator in park).

Ignition OFF.

Ignition ON.

Using a diagnostic scan tool, run the Inverter System Controller (ISC) self-test.

Is DTC P0726:62 present?

Yes	Refer to ENGINE CONTROLS - PINPOINT TESTS (HYBRID) .

No	The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.