DTC P0099:00 [MZ-CD 1.6 (Y6) (EURO5 emission level)]

id0102g7009900

DTC P0099:00

Boost air temperature sensor circuit intermittent/erratic
DETECTION CONDITION
•  The PCM monitors the boost air temperature sensor signal voltage. If the change in intake air temperature of the boost air temperature sensor exceeds 1.4999 V, the PCM determines that there is a malfunction in the boost air temperature sensor circuit.
POSSIBLE CAUSE
•  Boost air temperature sensor connector or terminal malfunction
•  Short to power supply in wiring harness between boost air temperature sensor terminal D and PCM terminal 2U
•  Short to ground in wiring harness between boost air temperature sensor terminal D and PCM terminal 2U
•  Boost air temperature sensor malfunction
•  PCM connector or terminal malfunction
•  Open circuit in the wiring harness between boost air temperature sensor terminal B and PCM terminal 2T
•  Open circuit in the wiring harness between boost air temperature sensor terminal D and PCM terminal 2U
•  PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION
1
VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
•   Has the FREEZE FRAME DATA been recorded?
Yes
Go to the next step.
No
Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2
VERIFY RELATED REPAIR INFORMATION AVAILABILITY
•  Verify related service repair information availability.
•  Is any related repair information available?
Yes
Perform repair or diagnosis according to the available repair information.
•   If the vehicle is not repaired, go to the next step.
No
Go to the next step.
3
INSPECT BOOST AIR TEMPERATURE SENSOR CONNECTOR CONDITION
•  Switch the ignition to OFF.
•  Disconnect the boost air temperature sensor connector.
•  Inspect for poor connection (such as damaged/pulled-out pins, corrosion)
•  Is there any malfunction?
Yes
Repair or replace the connector and/or terminals, then go to Step 9.
No
Go to the next step.
4
INSPECT BOOST AIR TEMPERATURE SENSOR SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY
•  Switch the ignition to ON (engine off).
•  Disconnect the boost air temperature sensor connector.
•  Measure the voltage at the boost air temperature sensor terminal D (wiring harness-side).
•  Is the voltage B+?
Yes
Repair or replace the wiring harness for a possible short to power supply, then go to Step 9.
No
Go to the next step.
5
INSPECT BOOST AIR TEMPERATURE SENSOR SIGNAL CIRCUIT FOR SHORT TO GROUND
•  Switch the ignition to OFF.
•  Disconnect the boost air temperature sensor connector.
•  Inspect for continuity between boost air temperature sensor terminal D (wiring harness-side) and body ground.
•  Is there continuity?
Yes
Repair or replace the wiring harness for a possible short to ground, then go to Step 9.
No
Go to the next step.
6
INSPECT BOOST AIR TEMPERATURE SENSOR
•  Inspect the boost air temperature sensor.
•  Is there any malfunction?
Yes
Replace the boost air temperature sensor, then go to Step 9.
No
Go to the next step.
7
INSPECT PCM CONNECTOR CONDITION
•  Disconnect the PCM connector.
•  Inspect for poor connection (such as damaged/pulled-out pins, corrosion)
•  Is there any malfunction?
Yes
Repair or replace the connector and/or terminals, then go to Step 9.
No
Go to the next step.
8
INSPECT BOOST AIR TEMPERATURE SENSOR CIRCUIT FOR OPEN
•  Inspect for continuity between boost air temperature sensor and PCM at following wiring harness-side connector:
―  Boost air temperature sensor terminal B and PCM terminal 2T
―  Boost air temperature sensor terminal D and PCM terminal 2U
•  Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness for a possible open circuit, then go to the next step.
9
VERIFY THAT DTC P0099:00 TROUBLESHOOTING IS COMPLETED
•  Make sure to reconnect all disconnected connectors.
•  Clear the DTC from the PCM memory using the M-MDS.
•  Run the vehicle under the FREEZE FRAME DATA stored condition.
•  Is the same DTC present?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the PCM.
(See PCM REMOVAL/INSTALLATION [MZ-CD 1.6 (Y6) (EURO5 emission level)].)
Go to the next step.
No
Go to the next step.
10
VERIFY AFTER REPAIR PROCEDURE
•  Perform the “After Repair Procedure“.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [MZ-CD 1.6 (Y6) (EURO5 emission level)].)
No
DTC troubleshooting completed.