Exhaust Back Pressure (EBP) Sensor

Signal Functions

The EBP (Exhaust Back Pressure) sensor is a variable capacitance sensor that when supplied with a 5 volt reference signal from the PCM produces a linear analog voltage signal that indicates exhaust back pressure.

The EBP sensor's primary function is to measure exhaust back pressure so that the PCM can control the exhaust back pressure regulator when needed.

Fault Detection/Management

An EBP signal that is detected out of range high or low by the PCM will cause the engine to ignore the EBP signal and disable exhaust back pressure operation.

The NGS tool will display a fixed PID value of 43.5 PSI (300 kPa) for EBP when exhaust back pressure is in default.

NOTE: After removing connector always check for damaged pins, corrosion, loose terminals etc.

Connector Checks to Ground (B-) (Check with Sensor Connector Disconnected and Ignition key off, all accessories off)

Test Points	Spec	Comments
A to Grd.	< 5 ohms	Resistance to grd check w/key off, if > than 5 ohms the harness is open - Signal Grd.
B to Grd.	> 1000 ohms	Resistance less than 1000 ohms indicates a short to ground - VRef
C to Grd.	> 1000 ohms	Resistance less than 1000 ohms indicates a short to ground - EBP signal

Connector Voltage Checks (Check with Sensor Connector Disconnected and Ignition Key On)

Test Points	Spec.	Comments
A to Grd.	0 - .25 volts	If greater than .25 volts signal ground is open or shorted to VRef or battery.
B to Grd.	5 Volts ± .5	VRef check with key "ON", if voltage not in spec., see VRef circuit
C to Grd.	0 - .25 volts	If greater than 0.25 volts, signal wire is shorted to VRef or battery

Harness Resistance Checks (Check with breakout box installed on engine harness only)

Test Points	Spec	Comments
#91 to A	< 5 ohms	Resistance from sensor connector to 104 pin connector - Signal Ground
#90 to B	< 5 ohms	Resistance from sensor connector to 104 pin connector - VRef
#30 to C	< 5 ohms	Resistance from harness connector to 104 pin connector - EBP signal

Operational Signal Checks (Check with breakout box installed in line with the PCM)

Test Points (+) #30 to (-) #91		KPAG	Comments
Voltage	PSIG
.8 - 1.0 v	0	0	Signal with key "ON" and engine OFF (Value dependent upon atmospheric pressure and altitude.)
.8 - 1.0 v	0	0	Normal warm idle signal
1.19 v	14.8	10.0	Minimum signal expected at 2300 RPM with warm engine (See EPR diagnostics.)

Diagnostic Trouble Code Descriptions

0472 = Signal voltage was less than .039 volts for more than 0.2 seconds
0473 = Signal voltage was greater than 4.90 volts for more than 0.2 seconds