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.
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 chassis grd. check w/key off, if > than 5 ohms
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 v signal ground is open or shorted to VRef or battery. |
| B to Grd. |
5 ± .5 volts |
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 sensor connector to 104 pin connector - EBP
signal |
| Test Points |
Operational Voltage Checks |
| (+) #30 to (-) #91 |
(Check with breakout box installed in line with the PCM) |
| Voltage |
PSI |
KPAG |
Comments |
| .8-1.0 v |
0 |
o |
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) |
| Circuit Faults: |
Diagnostic Trouble Code Description |
| 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. |
|
