DTC P0102

MAF sensor circuit low input

DETECTION CONDITION

• The PCM monitors input voltage from the MAF sensor when the engine running. If the input voltage is below 0.21 V, the PCM determines that the MAF circuit has a malfunction.

Diagnostic support note

• This is a continuous monitor (CCM).

• The MIL illuminates if the PCM detects the above malfunction condition during first drive cycle.

• PENDING CODE is available if the PCM detects the above malfunction condition.

• FREEZE FRAME DATA is available.

• The DTC is stored in the PCM memory.

POSSIBLE CAUSE

• MAF sensor malfunction

• Connector or terminal malfunction

• Short to ground in wiring harness between MAF/IAT sensor terminal C and PCM terminal 1AK

• Open circuit in wiring harness between MAF/IAT sensor terminal C and PCM terminal 1AK

• Open circuit in wiring harness between main relay and MAF/IAT sensor terminal A

• PCM malfunction

STEP

INSPECTION

ACTION

1

• Has 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 Service Bulletins and/or on-line 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

• Turn the ignition switch off.

• Disconnect the MAF/IAT sensor connector.

• Inspect for poor connection (such as damaged/pulled-out pins, corrosion).

• Is there any malfunction?

Yes

Repair or replace the terminals, then go to Step 9.

No

Go to the next step.

4

• Turn the ignition switch to the ON position. (Engine off)

• Inspect voltage at the MAF/IAT sensor terminal A (wiring harness-side).

• Is the voltage B+?

Yes

Go to the next step.

No

Repair or replace the wiring harness for a possible an open circuit, then go to Step 9.

5

• Inspect the MAF sensor.

  (See MASS AIR FLOW (MAF) SENSOR INSPECTION [LF].)

• Is there any malfunction?

Yes

Replace the MAF/IAT sensor, then go to Step 9.

(See MASS AIR FLOW (MAF)/INTAKE AIR TEMPERATURE (IAT) SENSOR REMOVAL/INSTALLATION [LF].)

No

Go to the next step.

6

• Turn the ignition switch off.

• Disconnect the PCM connector.

• Inspect for poor connection (such as damaged/pulled-out pins, corrosion).

• Is there any malfunction?

Yes

Repair the terminal, then go to Step 9.

No

Go to the next step.

7

• Remove the PCM with the PCM connector connected.

• Inspect for continuity between MAF/IAT sensor terminal C (wiring harness-side) and PCM terminal 1AK (wiring harness-side).

• Is there continuity?

Yes

Go to the next step.

No

Repair or replace the wiring harness, then go to Step 9.

8

• Inspect for continuity between MAF/IAT sensor terminal C (wiring harness-side) and body ground.

• Is there continuity?

Yes

Repair or replace the wiring harness, then go to the next step.

No

Go to the next step.

9

• Make sure to reconnect all disconnected connectors.

• Clear the DTC from the memory using the M-MDS.

• Start the engine.

• Is the same DTC present?

Yes

Replace the PCM, then go to the next step.

(See PCM REMOVAL/INSTALLATION [LF].)

No

Go to the next step.

10

• Perform the “AFTER REPAIR PROCEDURE”.

  (See AFTER REPAIR PROCEDURE [LF].)

• Are any DTC present?

Yes

Go to the applicable DTC troubleshooting.

(See DTC TABLE [LF].)

No

Troubleshooting completed.