P0069
P0069-BOOST KEY ON RATIONALITYP0069 - Boost Key On Rationality:
WHEN MONITORED
While the key is on.
SET CONDITION
The boost pressure recorded at key on is not within a calibrated range from the inlet air pressure sensor.
POSSIBLE CAUSES
- Other DTC's present
- Inlet air pressure sensor
- Boost pressure sensor
- Intermittent condition
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.
Diagnostic Test
1. OTHER DTC'S PRESENT
With the scan tool, read DTCs.
Q: Are any DTC's present for Inlet air pressure or boost pressure?
YES: Repair other DTC's first. Perform the POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). Powertrain Verification Test - Ver 1
NO: Go To 2
2. COMPARE THE INLET AIR PRESSURE
Using the scan tool, compare the inlet air pressure (barometric pressure) sensor reading to the boost pressure sensor reading.
Q: Are the pressure readings within 6 in Hg of each other?
YES: Go To 5
NO: Go To 3
3. INLET AIR PRESSURE SENSOR
Turn the ignition on, engine off.
Using the scan tool, read the inlet air pressure sensor value.
Q: Is the inlet air pressure sensor reading consistent with the barometric pressure for the geographic region?
YES: Go To 4
NO: Relace the inlet air pressure sensor. Perform the POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). Powertrain Verification Test - Ver 1
4. BOOST PRESSURE SENSOR
Using the scan tool, read the boost pressure sensor value.
Q: Is the Boost pressure sensor reading consistent with the barometric pressure for the geographic region?
YES: Go To 5
NO: Relace the Boost pressure sensor. Perform the POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). Powertrain Verification Test - Ver 1
5. INTERMITTENT CONDITION
The conditions necessary to set this DTC are not present at this time.
Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.
Wiggle the wiring and connectors while checking for any possible open or shorted circuits.
Check for any Service Information Tune-ups or Technical Service Bulletins that may apply.
Q: Were there any problems found?
YES: Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). Powertrain Verification Test - Ver 1
NO: Test Complete.