DTC P0069
Diagnostic Instructions
DTC Descriptor
DTC P0069: Manifold Absolute Pressure (MAP)
– Barometric Pressure (BARO) Not Plausible |
Circuit/System Description
The turbocharger pressure sensor responds to pressure changes in
the intake manifold. The pressure changes occur based on the engine
load, and turbocharger boost. The engine control module (ECM)
supplies 5 V to the turbocharger pressure sensor on the 5 V
reference circuit. The ECM provides a ground on the low reference
circuit. The turbocharger pressure sensor provides a signal to the
ECM on the sensor signal circuit which is relative to the pressure
changes in the manifold. The ECM detects a low signal voltage at a
low manifold absolute pressure, such as during deceleration. The
ECM detects a high signal voltage at a high manifold absolute
pressure, such as the ignition is ON, with the engine OFF, or at
idle. The barometric pressure (BARO) sensor is internal to the ECM.
This location allows for constant monitoring of the barometric
pressure. The ECM compares the turbocharger pressure sensor signal
to the internal BARO sensor signal when the ignition switch is
turned ON, with the engine OFF.
Conditions for Running the DTC
• |
DTCs P0107, or P0108 are not
set. |
• |
The DTC runs continuously when
the above conditions are met. |
Conditions for Setting the DTC
The ECM detects that the difference between the manifold
absolute pressure signal and the BARO signal is greater than 20 kPa
(2.90 PSI) for 1 s.
Action Taken When the DTC Sets
DTC P0069 is a Type B DTC.
Conditions for Clearing the DTC
DTC P0069 is a Type B DTC.
Diagnostic Aids
If a shared 5 V reference circuit is shorted to ground or
shorted to a voltage, other 5 V reference circuits may be
affected.
Reference Information
Schematic Reference
Engine Controls Schematics
Connector End View Reference
Component Connector End Views
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
1. |
Ignition ON, observe the DTC
information with a scan tool. DTC P0069 should not set.
|
|
Note: The vehicle
used for the comparison is not limited to the same type of vehicle
being serviced. A vehicle known to provide an accurate reading is
acceptable.
|
2. |
Compare the scan tool Boost
Pressure Sensor parameter, and the scan tool BARO pressure
parameter, to the pressure parameter of a known good vehicle. Both
readings should be within 3 kPa (0.44 PSI) of the known good
vehicle. |
3. |
Operate the vehicle within the
Conditions for Running the DTC to verify the DTC does not reset.
You may also operate the vehicle within the conditions that you
observed from the Freeze Frame/Failure Records data. |
Circuit/System Testing
1. |
Ignition ON, compare the scan
tool BARO parameter to the Boost Pressure Sensor parameter. Both
readings should be within 3 kPa (0.44 PSI). |
2. |
Ignition OFF, disconnect the
harness connector at the B111 Turbocharger Boost Sensor.
|
3. |
Test for less than 5 Ω
between the low reference circuit terminal 1 and ground.
|
⇒ |
If greater than the specified range, test the low
reference circuit for an open/high resistance. If the circuit tests
normal, replace the K20 Engine Control Module. |
4. |
Ignition ON, test for
4.8–5.2 V between the 5 V reference circuit terminal 3 and
ground. |
⇒ |
If less than the specified range, test the 5 V
reference circuit for a short to ground or open/high resistance. If
the circuit tests normal, replace the K20 Engine Control
Module. |
⇒ |
If greater than the specified range, test the 5 V
reference circuit for a short to voltage. If the circuit tests
normal, replace the K20 Engine Control Module. |
5. |
Verify the scan tool Boost
Pressure Sensor parameter is greater than 4.8 V. |
⇒ |
If less than the specified range, test the signal
circuit for a short to ground. If the circuit tests normal, replace
the K20 Engine Control Module. |
6. |
Install a 3 A fused jumper
wire between the signal circuit terminal 4 and the low reference
circuit terminal 3. Verify the Boost Pressure Sensor parameter is
less than 0.3 V. |
⇒ |
If greater than the specified range, test the
signal circuit for an open/high resistant or a short to voltage. If
the circuit tests normal, replace the K20 Engine Control
Module. |
7. |
If all circuits test normal,
replace the B111 Turbocharger Boost Sensor. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
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