Test Procedure

DR1 CHECK FOR DTCS

Are DTCs P0340, P0341, or P0344 present?

Yes	No
GO to DR2 .	For symptoms without DTCs, GO to DR2 . For all others, RETURN to ENGINE CONTROLS - SYMPTOM CHARTS (HYBRID) for further direction.

DR2 CLEAR AND ATTEMPT TO RETRIEVE THE DTC

NOTE: Consider the ignition system, alternator noise, radio frequency interference and crankshaft position 11 (CMP11) sensor concerns if DTCs P0340, P0341 or P0344 are present.

NOTE: Concerns with the engine oil level, oil filter, oil contamination, or the variable camshaft timing (VCT) system may cause camshaft positioning errors.

Ignition ON, engine OFF.
Clear the PCM DTCs.
Ignition ON, engine running.
Increase engine speed to greater than 1, 500 RPM for 10 seconds. Repeat this 3 times.
Carry out the PCM self-test.

Are DTCs P0340, P0341 or P0344 present?

Yes	No
GO to DR3 .	For symptoms without DTCs, RETURN to ENGINE CONTROLS - SYMPTOM CHARTS (HYBRID) for further direction. For all others, GO to PINPOINT TEST Z .

DR3 CHECK THE GENERATOR FOR EXCESSIVE ELECTRICAL NOISE

NOTE: If the generator/regulator is electrically noisy, the noise decreases when the B+ connector is disconnected.

Ignition ON, engine running.
Monitor the generator for an audible electric noise.
Ignition OFF.
Generator/regulator B+ connector disconnected.
Ignition ON, engine running.
With the engine running, determine if the generator noise remains steady, decreases or increases in volume.

Does the generator noise remain steady when the B+ connector is disconnected?

Yes	No
For DTC P0341, GO to DR11. For all others, GO to DR4 .	REFER to the Charging System article, to DIAGNOSE the generator is noisy symptom.

DR4 CHECK THE VBPWR CIRCUIT FOR AN OPEN

NOTE: For circuit DTCs set as a result of a concern with more than one component, refer to the OEM Wiring Diagrams, Electronic Engine Controls and identify the common cause, such as the SIGRTN circuits.

Ignition OFF.
CMP11 Sensor connector disconnected.
Ignition ON, engine OFF.

Measure the voltage between:

(+) CMP11 Sensor Connector, Harness Side	(-) CMP11 Sensor Connector, Harness Side
VBPWR - Pin 1	SIGRTN

Is the voltage greater than 10.5 V?

Yes	No
GO to DR7.	GO to DR5 .

DR5 CHECK THE VBPWR AND SIGRTN CIRCUITS FOR AN OPEN

Ignition OFF.
PCM connector disconnected.

Measure the resistance between:

(+) CMP11 Sensor Connector, Harness Side	(-) PCM Connector, Harness Side
VBPWR - Pin 1	VBPWR - Pin T22
SIGRTN - Pin 3	SIGRTN - Pin T29

Are the resistances less than 5 ohms?

Yes	No
GO to DR6 .	REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.

DR6 CHECK THE VBPWR CIRCUIT FOR A SHORT TO GROUND

Measure the resistance between:

(+) CMP11 Sensor Connector, Harness Side	(-)
VBPWR - Pin 1	Ground

Is the resistance greater than 10K ohms?

Yes	No
GO to DR13.	REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.

DR7 CHECK THE CMP11 CIRCUIT FOR AN OPEN

Ignition OFF.
PCM connector disconnected.

Measure the resistance between:

(+) CMP11 Sensor Connector, Harness Side	(-) PCM Connector, Harness Side
CMP11 - Pin 2	CMP11 - Pin T21

Is the resistance less than 5 ohms?

Yes	No
GO to DR8 .	REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.

DR8 CHECK THE CMP11 CIRCUIT FOR A SHORT TO GROUND

Measure the resistance between:

(+) CMP11 Sensor Connector, Harness Side	(-)
CMP11 - Pin 2	Ground

Is the resistance greater than 10K ohms?

Yes	No
GO to DR9 .	REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.

DR9 CHECK THE CMP11 CIRCUIT FOR A SHORT TO VOLTAGE

Ignition ON, engine OFF.

Measure the voltage between:

(+) CMP11 Sensor Connector, Harness Side	(-)
CMP11 - Pin 2	Ground

Is any voltage present?

Yes	No
REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.	GO to DR10 .

DR10 CHECK THE CMP11 SENSOR OUTPUT

Ignition OFF.
Generator/regulator B+ connector connected.
Ignition ON, engine running.
Digital multimeter (DMM) on low voltage AC scale.

Measure the voltage between:

(+) CMP11 Sensor Connector, Component Side	(-) CMP11 Sensor Connector, Component Side
CMP11 - Pin 2	SIGRTN - Pin 3

Is the voltage greater than 0.25 V?

Yes	No
GO to DR12.	INSTALL a new CMP11 sensor. REFER to the service information for the CMP11 sensor removal and installation procedure. Clear the PCM DTCs. REPEAT the self-test.

DR11 INSPECT THE HARNESS

Ignition OFF.
Check the harness for routing, alterations, incorrect shielding, or electrical interference from other systems.
Check the CMP11 sensor connector for damage or corrosion.

Is a concern present?

Yes	No
REPAIR as necessary. Clear the PCM DTCs. REPEAT the self-test.	GO to DR12 .

DR12 CHECK THE VCT SYSTEM

Check the VCT system for correct operation.

Is a concern present?

Yes	No
REPAIR as necessary. Clear the PCM DTCs. REPEAT the self-test.	GO to DR13 .

DR13 CHECK FOR CORRECT PCM OPERATION

Disconnect all the PCM connectors.
Visually inspect for:
- pushed out pins
- corrosion
Connect all the PCM connectors and make sure they seat correctly.
Carry out the PCM self-test.
Verify the concern is still present.

Is the concern still present?

Yes	No
INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) , Programming the VID Block for a Replacement PCM.	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.