DTC P0102, P0103, U060F, or U1319

Engine Controls and Fuel - 5.3L L84 or 6.2L L87 | Diagnostic Information and Procedures | Document ID: 5434341 Diagnostic Instructions Perform the Diagnostic System Check prior to using this diagnostic procedure: Diagnostic System Check - Vehicle Review the description of Strategy Based Diagnosis: Strategy Based Diagnosis An overview of each diagnostic category can be found here: Diagnostic Procedure Instructions DTC Descriptor DTC P0102 Mass Airflow Sensor Circuit Low DTC P0103 Mass Airflow Sensor Circuit High DTC U060F Lost Communication with Mass Airflow Sensor DTC U1319 Invalid Data Received from Mass Airflow Sensor Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performanc
Ignition	U060F, U1346	U060F, U1346*	—	—
Signal	P0102, P1101	P0102	P0102*	P0096, P0101, P0103
Serial Data	U060F, U1346	U060F, U1346	U060F, U1346	—
Ground	—	P0102, U060F, U1346	—	P0096, P0102
* Internal control module or component damage may occur if the circuit shorts to B+.

Typical Scan Tool Data Mass Airflow Sensor Short to Short to Circuit Ground Open Voltage Operating Conditions: Accessories = Off Engine = Idling — At normal operating temperature.

Circuit	Short to Ground	Open	Short to Voltage
Parameter Normal Range: 1,551 to 6,449 Hz
Ignition	0 Hz	0 Hz	—
Signal	0 Hz	0 Hz	0 Hz
Ground	—	0 Hz	—

Circuit/System Description

Circuit	Description
Ignition	Supplied from a fuse.
Signal	The control module input circuit has an internal resistance connected to 5 V.
Serial Data	Digitally encoded information for communication between devices.
Ground	Chassis Ground

Component	Description
B75 Mass Airflow Sensor	The mass air flow sensor is a hot film type sensor that measures the mass of air (not the volume) entering the engine. The signal varies with engine load and is displayed by the scan tool in Hertz (Hz) and grams per second (g/s).
K20 Engine Control Module	The control module contains a microprocessor used to process input data to control outputs. The control module controls a series of actuators to ensure optimal engine performance. The control module does this by reading values from a variety of sensors, interprets the data and adjusts the engine actuators accordingly.

Conditions for Running the DTC P0102, P0103, U060F Engine = Running — For greater than 1 s Engine Speed = Greater than 299 RPM Ignition and Start Signal = Greater than 9 V { U060F } Ignition and Start Signal = Greater than 11 V { U060F } LIN Bus = Enabled Frequency the DTC runs = Continuously — After the running conditions are met — For greater than 1 s U1319 Ignition and Start Signal = Greater than 11 V Ignition and Start Switch Signal = Run Frequency the DTC runs = Continuously — After the running conditions are met — For greater than 3 s Conditions for Setting the DTC P0102 Mass Airflow Sensor = Less than 1,550 Hz — For greater than 6 s P0103 Mass Airflow Sensor = Greater than 6,450 Hz — For greater than 6 s U060F Serial data message from component: B75 Mass Airflow Sensor = Not Received — For greater than 1 s U1319 Serial data message from component: B75 Mass Airflow Sensor = Message Counter Incorrect — For greater than 1 s Actions Taken When the DTC Sets DTCs listed in the DTC Descriptor category = Type A DTC DTC U060F, U1319 = Type B DTC Oil Pressure — Gauge = Inoperative Conditions for Clearing the DTC DTCs listed in the DTC Descriptor category = Type A DTC DTC U060F, U1319 = Type B DTC Reference Information Schematic Reference Engine Controls Schematics Connector End View Reference Master Electrical Component List Component View Reference Powertrain Component Views Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs DTC Type Reference Powertrain Diagnostic Trouble Code (DTC) Type Definitions Scan Tool Reference Control Module References Circuit/System Verification

1. Ignition » On / Vehicle » In Service Mode
2. Verify DTC U1319 is not set and no other DTCs are set. ⇒ If DTC U1319 is set and no other DTCs are set Replace the component: B75 Mass Airflow Sensor ⇓ If the DTC is not set
3. Verify DTC U060F, U1346 is not set and no other DTCs are set. ⇒ If DTC P0102, U060F, U1346 is set and no other DTCs are set Refer to: Circuit/System Testing — Test 1 ⇒ If DTC P0102, P0103 is set and no other DTCs are set Refer to: Circuit/System Testing — Test 1 ⇒ If DTC U060F, U1346 is set and other DTCs are set Refer to: Circuit/System Testing — Test 2 ⇓ If none of the DTCs are set
4. Engine » Idling
5. Increase the engine speed slowly to 3,000 RPM and then back to idle.
6. Perform the scan tool function: Review Stored Data
7. Observe the scan tool parameter frame by frame with a scan tool: Mass Airflow Sensor Verify the scan tool parameter: Mass Airflow Sensor = The value should not spike or drop out. ⇒ If the value spikes or drops out Refer to: Circuit/System Testing — Test 1 ⇓ If the value does not spike or drop out
8. Verify the scan tool parameter: Mass Airflow Sensor = The value should not spike or drop out. Perform the action while monitoring the parameter: Wiggle the harness and connector: B75 Mass Airflow Sensor Wiggle the harness and connector: K20 Engine Control Module ⇒ If the value spikes or drops out Repair as necessary » Wiring / Terminal(s) / Electrical Connector(s) ⇓ If the value does not spike or drop out
9. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data. Verify the DTC does not set. ⇒ If the DTC is set Repeat the procedure starting at step 2 ⇓ If the DTC is not set
10. All OK. Circuit/System Testing Test 1

Note

It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

1. Ignition/Vehicle & All vehicle systems » Off
2. Disconnect the electrical connector: B75 Mass Airflow Sensor
3. Test for less than 5 Ω between the test points: Ground circuit terminal 4 & Ground ⇒ If 5 Ω or greater 3.1. Disconnect the ground connection: Ground terminal 3.2. Test for less than 2 Ω between the test points: Ground circuit terminal 4 @ Component harness & The other end of the circuit @ Ground terminal ⇒ If 2 Ω or greater » Repair the open/high resistance in the circuit. ⇒ If less than 2 Ω » Repair the open/high resistance in the ground connection. ⇓ If less than 5 Ω
4. Ignition » On / Vehicle » In Service Mode
5. Test for 4.8 to 5.2 V between the test points: Signal circuit terminal 2 & Ground ⇒ If less than 4.8 V 5.1. Ignition/Vehicle » Off 5.2. Disconnect the appropriate electrical connector: K20 Engine Control Module 5.3. Test for infinite resistance between the test points: Signal circuit terminal 2 @ Component harness & Ground ⇒ If less than infinite resistance » Repair the short to ground on the circuit. ⇓ If infinite resistance 5.4. Test for less than 2 Ω between the test points: Signal circuit terminal 2 @ Component harness & The other end of the circuit @ Control module harness ⇒ If 2 Ω or greater » Repair the open/high resistance in the circuit. ⇒ If less than 2 Ω » Replace the component: K20 Engine Control Module ⇒ If greater than 5.2 V 5.1. Ignition/Vehicle » Off 5.2. Disconnect the appropriate electrical connector: K20 Engine Control Module 5.3. Ignition » On / Vehicle » In Service Mode 5.4. Test for less than 1 V between the test points: Signal circuit terminal 2 @ Component harness & Ground ⇒ If 1 V or greater » Repair the short to voltage on the circuit. ⇒ If less than 1 V » Replace the component: K20 Engine Control Module ⇓ If between 4.8 and 5.2 V
6. Engine » Idling

Note

Use the appropriate diagnostic test probe for best results. For this test, the action may need to be repeated several times.

7. Connect a 3 A fused jumper wire to the test point: Signal circuit terminal 2 @ Component harness & Rapidly tap the open end of the jumper to ground. Verify the scan tool parameter: Mass Airflow Sensor = Greater than 0 Hz — While tapping the jumper to ground ⇒ If 0 Hz Replace the component: K20 Engine Control Module ⇓ If greater than 0 Hz
8. Test or replace the component: B75 Mass Airflow Sensor Test 2

Note

It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

1. Ignition/Vehicle & All vehicle systems » Off
2. Disconnect the electrical connector: B75 Mass Airflow Sensor
3. Test for less than 5 Ω between the test points: Ground circuit terminal 4 & Ground ⇒ If 5 Ω or greater 3.1. Disconnect the ground connection: Ground terminal 3.2. Test for less than 2 Ω between the test points: Ground circuit terminal 4 @ Component harness & The other end of the circuit @ Ground terminal ⇒ If 2 Ω or greater » Repair the open/high resistance in the circuit. ⇒ If less than 2 Ω » Repair the open/high resistance in the ground connection. ⇓ If less than 5 Ω
4. Ignition » On / Vehicle » In Service Mode
5. Verify a test lamp turns On between the test points: Ignition circuit terminal 1 & Ground ⇒ If the test lamp does not turn On and the circuit fuse is OK 5.1. Ignition/Vehicle » Off & Remove » Test lamp 5.2. Test for less than 2 Ω between the test points: Ignition circuit terminal 1 & Output terminal @ Fuse ⇒ If 2 Ω or greater » Repair the open/high resistance in the circuit. ⇒ If less than 2 Ω » Verify the fuse is OK and there is voltage at the fuse. ⇒ If the test lamp does not turn On and the circuit fuse is open 5.1. Ignition/Vehicle » Off & Remove » Test lamp 5.2. Ignition » On / Vehicle » In Service Mode 5.3. Replace the component: Fuse 5.4. Verify the fuse does not open. ⇒ If the fuse opens and there are components connected to the circuit » Disconnect a component and repeat procedure starting at step 5.3 ⇒ If the fuse opens with all components disconnected from the circuit » Repair the short to ground on the circuit. ⇒ If the fuse does not open after disconnecting a component from the circuit » Replace the component disconnected last. ⇓ If the fuse does not open.

Note

It may be necessary to use a scan tool control function to operate a component. 5.5. Operate the component: Each component on the circuit — One at a time Verify the fuse does not open when any of the components are activated. ⇒ If the fuse opens » Replace the component that caused the fuse to open when activated. ⇓ If the fuse does not open. 5.6. All OK. ⇓ If the test lamp turns On

6. Test for 9 to 11 V between the test points: Serial Data circuit terminal 3 & Ground ⇒ If less than 9 V 6.1. Ignition/Vehicle » Off 6.2. Disconnect the appropriate electrical connector: K20 Engine Control Module 6.3. Test for infinite resistance between the test points: Serial Data circuit terminal 3 @ Component harness & Ground ⇒ If less than infinite resistance » Repair the short to ground on the circuit. ⇓ If infinite resistance 6.4. Test for less than 2 Ω between the test points: Serial Data circuit terminal 3 @ Component harness & The other end of the circuit @ Control module harness ⇒ If 2 Ω or greater » Repair the open/high resistance in the circuit. ⇒ If less than 2 Ω » Replace the component: K20 Engine Control Module ⇒ If greater than 11 V 6.1. Ignition/Vehicle » Off 6.2. Disconnect the appropriate electrical connector: K20 Engine Control Module 6.3. Ignition » On / Vehicle » In Service Mode 6.4. Test for less than 1 V between the test points: Serial Data circuit terminal 3 @ Component harness & Ground ⇒ If 1 V or greater » Repair the short to voltage on the circuit. ⇒ If less than 1 V » Replace the component: K20 Engine Control Module ⇓ If between 9 and 11 V
7. Test or replace the component: B75 Mass Airflow Sensor Repair Instructions Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification Mass Airflow Sensor Replacement — B75 Mass Airflow Sensor For control module replacement, programming, and setup refer to: Control Module References