![[Previous]](../../../buttons/fprev.png)
![[Next]](../../../buttons/fnext.png)
DTC P0069: Abnormal
Correlation Between Manifold Absolute Pressure Sensor And Barometric Pressure Sensor
TECHNICAL DESCRIPTION
- The ECM detects abnormality in the sensor by comparing
the manifold absolute pressure sensor output with the barometric pressure sensor output.
DESCRIPTIONS OF MONITOR METHODS
The ECM compares the manifold absolute pressure sensor
output with the barometric pressure sensor output while the engine control relay is in "ON"
position after the ignition switch is in "LOCK" (OFF) position. When the difference exceeds
the specified value between them, the ECM determines whether the manifold absolute pressure
sensor / the barometric pressure sensor has malfunction or not.
MONITOR EXECUTION
MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)
Other Monitor (There is no temporary DTC stored in memory
for the item monitored below)
Sensor (The sensor below is determined to be normal)
- Engine coolant temperature sensor
- Barometric pressure sensor
- Manifold absolute pressure sensor
DTC SET CONDITIONS
Logic Flow Chart
Check Conditions
- Ignition switch is in "LOCK" (OFF) position.
- After 2 seconds pass from the time when the engine is stopped.
- Engine coolant temperature is more than 0°C (32°F).
Judgement Criterion
- Difference between barometric pressure sensor output and manifold absolute pressure
sensor output is more than 9 kPa (2.7 in.Hg) for 2 seconds.
FAIL-SAFE AND BACKUP FUNCTION
OBD-II DRIVE CYCLE PATTERN
TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)
- Manifold absolute pressure sensor failed.
- Barometric pressure sensor failed.
- ECM failed.
|
|
Required Special Tools
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: USB Cable
- MB991910: Main Harness A
|
|
|
STEP 1. Using scan tool MB991958, read the diagnostic trouble
code (DTC).
|
|
| caution |
To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK"
(OFF) position before connecting or disconnecting scan tool MB991958.
|
(1)Connect scan tool MB991958 to the data link connector.
(2)Turn the ignition switch to the "ON" position.
(3)Set scan tool MB991958, read the DTC.
(4)Turn the ignition switch to the "LOCK" (OFF) position.
Q.
Is the diagnostic trouble code other than P0069 set?
 Refer to, Diagnostic Trouble Code Chart  .
 Go to Step 2.
|
|
|
STEP 2. Using scan tool MB991958, check data list item 8: Manifold
Absolute Pressure Sensor.
|
|
|
(1)Turn the ignition switch to the "ON" position.
|
|
|
(2)Set scan tool MB991958 to the data reading mode for item 8, Manifold Absolute Pressure
Sensor.
- When altitude is 0 m (0 foot), 101 kPa (29.8 in.Hg).
- When altitude is 600 m (1,969 feet), 95 kPa (28.1 in.Hg).
- When altitude is 1,200 m (3,937 feet), 88 kPa (26.0 in.Hg).
- When altitude is 1,800 m (5,906 feet), 81 kPa (23.9 in.Hg).
|
|
|
(3)Start the engine.
- When the engine is idling, 31 -
45 kPa (9.2 -
13.3
in.Hg).
- When the engine is suddenly revved, manifold absolute pressure varies.
|
|
|
(4)Turn the ignition switch to the "LOCK" (OFF) position.
|
|
|
Q.
Is the sensor operating properly?
|
|
|
Go to Step 3.
|
|
|
|
|
|
Refer to, DTC P0106 -
Manifold Absolute Pressure Circuit Range/Performance
Problem , DTC P0107 -
Manifold Absolute Pressure Circuit
Low Input , DTC P0108 -
Manifold Absolute Pressure
Circuit High Input .
|
|
|
|
|
|
STEP 3. Using scan tool MB991958, read the diagnostic trouble code
(DTC).
|
|
|
(1)Turn the ignition switch to the "ON" position.
|
|
|
(4)Turn the ignition switch to "LOCK" (OFF) position and then wait 2 seconds.
|
|
|
(5)Turn the ignition switch to the "ON" position.
|
|
|
(6)Set scan tool MB991958, read the DTC.
|
|
|
(7)Turn the ignition switch to the "LOCK" (OFF) position.
|
|
|
Replace the ECM. When the ECM is replaced, register the ID code. Refer to GROUP
42B, Diagnosis -
ID Code Registration Necessity Judgment Table <Vehicles with KOS> or
GROUP 42C, Diagnosis -
ID Codes Registration Judgment Table <Vehicles with WCM> .
Then go to Step 4.
|
|
|
|
|
|
It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How
to Use Troubleshooting/Inspection Service Points -
How to Cope with Intermittent
Malfunctions .
|
|
|
|
|
|
STEP 4. Using scan tool MB991958, read the diagnostic trouble code
(DTC).
|
|
|
(1)Turn the ignition switch to the "ON" position.
|
|
|
(4)Turn the ignition switch to "LOCK" (OFF) position and then wait 2 seconds.
|
|
|
(5)Turn the ignition switch to the "ON" position.
|
|
|
(6)Set scan tool MB991958, read the DTC.
|
|
|
(7)Turn the ignition switch to the "LOCK" (OFF) position.
|
|
|
Retry the troubleshooting.
|
|
|
|
|
|
The inspection is complete.
|
|
|
|
)
)