P0100-MAF SENSOR SIGNAL VOLTAGE TOO LOW

For a complete wiring diagram Refer to Section 8W

When Monitored:
Engine speed is between 500 and 5000 rpm.
Set Condition:
The Mass Air Flow Sensor signal is above 800 kg/h for 0.5 seconds.

Possible Causes

ASD RELAY OUTPUT CIRCUIT OPEN

ECM - 5-VOLT SUPPLY CIRCUIT

MAF SENSOR GROUND OPEN

MASS AIRFLOW SENSOR

MAF SENSOR 5 VOLT SUPPLY CIRCUIT OPEN

MAF SENSOR SIGNAL CIRCUIT OPEN

MAF SENSOR 5 VOLT SUPPLY CIRCUIT SHORTED TO THE MAF SENSOR GROUND CIRCUIT

MAF SENSOR SIGNAL CIRCUIT SHORTED TO GROUND

ECM SENSOR GROUND CIRCUIT OPEN

MAF SENSOR 5 VOLT SUPPLY CIRCUIT SHORTED TO GROUND

MAF SENSOR SIGNAL CIRCUIT SHORTED TO THE MAF SENSOR GROUND CIRCUIT

MAF SENSOR 5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE

MAF SENSOR CIRCUIT SHORTED TO VOLTAGE

ECM - MAF SENSOR SIGNAL CIRCUIT

Diagnostic Test

1.VERIFY ACTIVE DTC

NOTE: If DTC P0641, P0651 or P0697 is present with this DTC, diagnose DTCs P0641, P0651 or P0697 before diagnosing this DTC.

NOTE: Inspect the turbocharger inlet tube between the MAF Sensor and the turbocharger for damage, restriction or poor connection. Any of these conditions can cause a MAF Plausibility DTC.

NOTE: If the ECM detects and stores a DTC, the ECM also stores the engine/vehicle operating conditions under which the DTC was set. Some of these conditions are displayed on the scan tool at the same time the DTC is displayed.

NOTE: Before erasing stored DTCs, record these conditions. Attempting to duplicate these conditions may assist when checking for an active DTC.

Does the scan tool display a Mass Air Flow Sensor DTC?

Yes

Go To2

Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

2.VERIFY SENSOR 5 VOLT SUPPLY

NOTE: A malfunctioning EGR system can cause this DTC to set. Refer to symptom Checking the EGR System in the Driveability category to check EGR system operation.

Is the voltage between 4.8 and 5.2 volts?

Yes

Go To3

Go To11

3.MAF SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE

Is the voltage above 1.0 volt?

Yes

Repair the MAF Sensor Signal circuit for a short to voltage.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

Go To4

4.MAF SENSOR SIGNAL CIRCUIT OPEN

Is the resistance below 10.0 ohms?

Yes

Go To5

Repair the MAF Sensor Signal circuit for an open
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

5.MAF SENSOR SIGNAL CIRCUIT SHORTED TO GROUND

Is the resistance below 1000 ohms?

Yes

Repair the MAF Sensor Signal circuit for a short to ground.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

Go To6

6.MAF SENSOR SIGNAL CIRCUIT SHORTED TO THE MAF SENSOR GROUND CIRCUIT

Is the resistance below 1000 ohms?

Yes

Repair the MAF Sensor Signal for a short to MAF Sensor Ground .
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

Go To7

7.VERIFY MAF SIGNAL CIRCUIT

Does the scan tool display between 4.0 and 5.5 volts?

Yes

Go To8

Replace and program the Engine Control Module in accordance with the Service Information.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

8.MAF SENSOR GROUND OPEN

Is the resistance below 10.0 ohms?

Yes

Go To9

Repair the MAF Sensor Ground circuit for an open.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

9.ECM - SENSOR GROUND OPEN

Is the voltage above 4.5 volts?

Yes

Go To10

Replace and program the ECM in accordance with the Service Information.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

10.ASD RELAY OUTPUT CIRCUIT OPEN

Is the voltage above 10.0 volts?

Yes

Replace the MAF Sensor.
Perform ROAD TEST VERIFICATION - VER-2.

Repair the ASD Relay Output circuit for an open.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

11.MAF SENSOR 5 VOLT SUPPLY CIRCUIT OPEN

Is the resistance below 10.0 ohms?

Yes

Go To12

Repair the MAF Sensor 5 Volt Supply circuit for an open.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

12.MAF SENSOR 5 VOLT SUPPLY CIRCUIT SHORTED TO THE MAF SENSOR GROUND CIRCUIT

Is the resistance above 1000 ohms?

Yes

Go To13

Repair the MAF Sensor 5 Volt Supply circuit for a short to the MAF Sensor Ground circuit.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

13.MAF SENSOR 5 VOLT SUPPLY CIRCUIT SHORTED TO GROUND

Is the resistance below 1000 ohms?

Yes

Repair the MAF Sensor 5 Volt Supply circuit for a short to ground.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

Go To14

14.MAF SENSOR 5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE

Is the voltage above 1.0 volt?

Yes

Repair the MAF Sensor 5 Volt Supply circuit for a short to voltage.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

Replace and program the Engine Control Module in accordance with the Service Information.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).