Test X: Exhaust Pressure (EP) Sensor
PINPOINT TEST X: EXHAUST PRESSURE (EP) SENSORFlow Chart (Part 1):
Flow Chart (Part 2):
This pinpoint test is intended to diagnose the following:
- Harness circuits: EP, SIGRTN, VREF
- EP sensor
- Powertrain control module (PCM) (12A650)
Exhaust Pressure (EP) Sensor Connector
Exhaust Pressure (EP) Sensor Connector:
PCM Connector
PCM Connector:
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X1 : PRELIMINARY DIAGNOSIS FOR DTCS P0470, P0471, P0472, OR P0473
NOTE: Diagnose and repair EP sensor circuit DTCs before addressing range/performance concerns.
- Carry out a visual inspection.
- Retrieve and record all DTCs.
- Record the freeze frame data.
- Clear the DTCs.
- Carry out the KOEO self-test. Quick Test Description
- Carry out the KOER self-test. Quick Test Description
- Are DTCs P0470, P0471, P0472, or P0473 present?
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X2 : DIAGNOSTIC TROUBLE CODE (DTC) P0470
- Ignition ON, engine OFF.
- Access the PCM and monitor the EBP_A PID.
- Is the EBP_A PID less than 127 kPa (18.5 psi)?
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X3 : CHECK THE EP SENSOR PRESSURE
- Access the PCM and monitor the EBP_A PID.
- Access the PCM and monitor the MAP PID.
- Access the PCM and monitor the BARO PID.
- Is the EBP_A PID value within 10.34 kPa (1.5 psi) of the MAP and BARO PID values?
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X4 : CHECK THE SIGNAL RETURN CIRCUIT
NOTE: Check the sensor and connector for a damaged or missing seal and bent or damaged pins.
- Ignition OFF.
- EP Sensor connector disconnected.
- PCM connector disconnected.
- Measure the resistance between:
- Are the resistances less than 5 ohms?
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X5 : CHECK THE EP SENSOR
NOTICE: Using air pressure greater than 69 kPa (10 psi) may damage the EP sensor.
- Remove the EP sensor.
- Check for contamination, restrictions or carbon build-up in the EP sensor port, mounting bracket or tube. Repair as necessary.
- Check for moisture in the EP sensor port. If moisture is present, use 69 kPa (10 psi) regulated air pressure to remove the moisture.
- EP Sensor connector connected.
- PCM connector connected.
- Ignition ON, engine OFF.
- Access the PCM and monitor the EBP_A PID.
- Access the PCM and monitor the MAP PID.
- Access the PCM and monitor the BARO PID.
- Is the EBP_A PID value within 10.34 kPa (1.5 psi) of the MAP and BARO PID values?
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X6 : CHECK THE EP SENSOR PERFORMANCE
NOTE: Additional DTCs may set as a result of this test.
- Remove the EP sensor from tube.
- Ignition ON, engine OFF.
- Using the pressure adapter kit 014-00761, or an equivalent gauge bar, apply 69 kPa (10 psi) of pressure to the EP sensor.
- Access the PCM and monitor the EBP_G PID.
- Does the EBPG PID read between 55-82 kPa (8-12 psi)?
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X7 : DIAGNOSTIC TROUBLE CODE (DTC) P0471
NOTE: Visually inspect the vehicle for aftermarket accessories and performance modifications (exhaust system, turbocharger, performance chip). Refer to Description and Operation, Electronic Engine Control (EEC) System, Modifications to OBD Vehicles. Electronic Engine Control (EEC) System
- Carry out the KOEO self-test. If other DTCs are present, repair before continuing. Refer to DTC Index Diagnostic Trouble Code (DTC) Charts and Descriptions. Quick Test Description Testing and Inspection
- Access the PCM and monitor the EBP_A PID.
- Road test the vehicle under hard acceleration while monitoring the EP PID.
- Is the EBP_A increase greater than 25 psi?
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X8 : INSPECT FOR EXHAUST LEAKS
- Inspect the turbocharger pipe and exhaust manifolds for leaks.
- Are any exhaust leaks present?
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X9 : CHECK THE EP SENSOR SUPPLY TUBE
- Inspect the EP sensor supply tube.
- Is the EP sensor tube restricted or plugged?
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X10 : EP SENSOR CHECK
- EP Sensor connector disconnected.
- Install the ICP/EBC Adapter Cable D94T-50-A or equivalent between the EP sensor and the vehicle harness.
- Ignition ON, engine running.
- Measure the voltage between the EP signal circuit and ground on the ICP/EBC Adapter Cable D94T-50-A.
- Accelerate the engine to wide open throttle (WOT) several times.
- Is the voltage greater than 1.35 volts during acceleration?
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X11 : DIAGNOSTIC TROUBLE CODE (DTC) P0472
- Ignition OFF.
- EP Sensor connector disconnected.
- Ignition ON, engine OFF.
- Measure the voltage between:
- Is the voltage between 4.5 V - 5.5 V?
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X12 : CHECK THE EP SENSOR SIGNAL
- Access the PCM and monitor the EBP PID.
- Connect a 5 amp fused jumper wire between the following:
- Is the EBP PID voltage approximately 4.5 to 5.5 volts?
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X13 : CHECK THE SIGNAL CIRCUIT FOR AN OPEN
- Ignition OFF.
- PCM connector disconnected.
- Measure the resistance between:
- Is the resistance less than 5 Ohm?
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X14 : CHECK THE SIGNAL CIRCUIT FOR A SHORT TO GROUND
- Measure the resistance between:
- Is the resistance greater than 10 kOhm?
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X15 : DIAGNOSTIC TROUBLE CODE (DTC) P0473
- Ignition OFF.
- EP Sensor connector disconnected.
- The EP sensor is disconnected to simulate the opposite DTC.
- Ignition ON, engine OFF.
- Carry out the KOEO on-demand self-test. Quick Test Description
- Is DTC P0472 present?
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X16 : CHECK THE EP SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition OFF.
- PCM connector disconnected.
- Ignition ON, engine OFF.
- Measure the voltage between:
- Is any voltage indicated?
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X17 : CHECK THE EP SENSOR SIGNAL RETURN CIRCUIT FOR AN OPEN
- Ignition OFF.
- Measure the resistance between:
- Is the resistance less than 5 Ohm?
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X18 : CHECK THE EP SENSOR FOR BIAS
- Ignition ON, engine OFF.
- Access the PCM and monitor the EBP_A PID.
- Access the PCM and monitor the MAP PID.
- Access the PCM and monitor the BARO PID.
- Refer to Reference Values for normal operating values. Pinout Values and Diagnostic Parameters
- Is the EBP_A PID value within 10.34 kPa (1.5 psi) of the MAP and BARO PID values?
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X19 : CHECK FOR AN INTERMITTENT CONCERN
- Ignition ON, engine OFF.
- Access the PCM and monitor the EBP_A PID.
- Observe the EBP_A PID while carrying out the following:
- Grasp the vehicle harness close to the EP sensor connector.
- Wiggle and shake the vehicle harness while working toward the PCM
- Does the EBP_A PID value fluctuate?
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X20 : INSPECT THE EP SENSOR CONNECTOR AND TERMINALS
- Ignition OFF.
- EP Sensor connector disconnected.
- Check the sensor and connector for a damaged or missing seal and bent or damaged pins.
- Are any concerns present?
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X21 : 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 and verify the concern is still present.
- Is the concern still present?
