Diagnosis Procedure

1. Turn ignition switch ON.
2. Connect CONSULT and check for ENGINE diagnostic trouble codes.
3. Check for DTC P0102-00 being current on the CONSULT screen.

Is applicable DTC detected?

YES

GO TO 2 .

NO

Refer to Intermittent Incident .

Using CONSULT, check for other "current" ENGINE diagnostic trouble codes.

Is DTC P262D-00 detected?

YES

Refer to DTC Description .

NO

GO TO 3 .

1. Inspect the intake and exhaust systems for blockage or restrictions
   • Inspect the air filter for excessive dirt, soiling or other problems that can cause restricted air flow
   • Inspect the charge-air cooler hoses/tubes and connections
   • Inspect all air intake, crankcase vent and turbocharger related hoses/tubes and connections for damage, air leaks or blockage
   • Check charge-air cooler restriction
2. Inspect the exhaust system for damaged components that could cause exhaust flow blockage.

Are any blockages or damages found?

YES

Repair or replace damaged or restricted component.

NO

GO TO 4 .

1. Turn ignition switch OFF.
2. Disconnect mass air flow sensor from engine harness connector.
3. Remove the mass air flow sensor from its mounting location.
4. Inspect the mass air flow sensor body and heated wire for the following:
   • Loose connector
   • Corroded pins
   • Bent or broken pins
   • Pushed back or expanded pins
   • Moisture in or on the connector
   • Missing or damaged connector seals
   • Dirt or debris on or in the connector pins
   • Connector shell broken
   • Wire insulation damage
   • Damaged connector locking tab

Is the inspection result normal?

YES

GO TO 5 .

NO

Repair or replace error-detected parts.

1. Turn ignition switch ON.
2. Check the voltage between MAF sensor supply voltage and return circuit terminals.

   MAF sensor			Voltage (V) Approx.
   Connector	Terminal (+)	Terminal (-)
   F104	2	3	Battery voltage

Is the inspection result normal?

YES

GO TO 6 .

NO

GO TO 8 .

1. Turn ignition switch OFF.
2. Disconnect the ECM connector F101.
3. Wait 30 seconds.
4. Measure the resistance between MAF sensor supply voltage and return circuit terminals.

   MAF sensor			Resistance
   Connector	Terminal	Terminal
   F104	2	3	> 100 KΩ

Is the inspection result normal?

YES

GO TO 7 .

NO

• Repair or replace harness for a short circuit.
• GO TO 11 .

Measure the resistance between MAF sensor signal circuit and return circuit terminals.

Is the inspection result normal?

YES

GO TO 8 .

NO

• Repair or replace harness for a short circuit.
• GO TO 11 .

Measure the resistance of the MAF sensor signal circuit between the MAF sensor and the ECM.

Is the inspection result normal?

YES

GO TO 9 .

NO

• Repair or replace harness for a open circuit.
• GO TO 11 .

Inspect the ECM connector pins for the following:

• Loose connector
• Corroded pins
• Bent or broken pins
• Pushed back or expanded pins
• Moisture in or on the connector
• Missing or damaged connector seals
• Dirt or debris on or in the connector pins
• Connector shell broken
• Wire insulation damage
• Damaged connector locking tab.

Is the inspection result normal?

YES

GO TO 10 .

NO

• Repair or replace error-detected parts.
• GO TO 11 .

1. Turn ignition switch ON.
2. With ECM connector F101 disconnected, check the voltage between MAF sensor supply voltage and return circuit pins at the ECM.

   ECM			Voltage (V) Approx.
   Connector	Terminal (+)	Terminal (-)
   F101	138	127	Battery voltage

Is the inspection result normal?

YES

• Repair open circuit in harness or connectors.
• GO TO 11 .

NO

• Replace the ECM. Refer to Removal and Installation .
• GO TO 11 .

1. Turn ignition switch OFF.
2. Connect all components.
3. Turn ignition switch ON.
4. Using CONSULT, erase ENGINE diagnostic trouble codes.
5. Operate the engine within the "Conditions for setting the DTC".
6. Using CONSULT, check for ENGINE diagnostic trouble codes.

Is P0102-00 DTC detected?

YES

Return to Diagnosis Procedure. Refer to DTC Description .

NO

Repair complete.