STEP 1. Check if the EGR valve sounds during initialization.
STEP 2. Using scan tool MB991958, read the diagnostic trouble code (DTC).
caution | To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. |
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Read the DTC.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is any DTC set?
Refer to, Diagnostic Trouble Code Chart . Go to Step 3.
STEP 3. Using scan tool MB991958, read the diagnostic trouble code (DTC).
note | When the CVT has a malfunction, the TCM might output the request signal of reducing the engine torque in order to protect the CVT. |
(1) Turn the ignition switch to the "ON" position.
(2) Read the TCM-DTC.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Is the TCM-DTC set?
Refer to GROUP 23A, Diagnosis - Diagnostic Trouble Code Chart . Go to Step 4.
STEP 4. Using scan tool MB991958, check actuator test.
(1) Turn the ignition switch to the "ON" position.
(2) Check the following item in the actuator test. Refer to Actuator Test Reference Table . (3) Turn the ignition switch to the "LOCK" (OFF) position.
Are thy operating properly?
Go to Step 5. Repair or replace it. Then confirm that the malfunction symptom is eliminated.
STEP 5. Check the ignition timing.
STEP 6. Using scan tool MB991958, check data list.
(1) Turn the ignition switch to the "ON" position.
(2) Check the following items in the data list. Refer to Data List Reference Table .- Item 5: Intake Air Temperature Sensor
- Item 6: Engine Coolant Temperature Sensor
- Item 11: Accelerator Pedal Position Sensor (main)
- Item 12: Accelerator Pedal Position Sensor (sub)
- Item 13: Throttle Position Sensor (main)
- Item 15: Throttle Position Sensor (sub)
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Are they operating properly?
Go to Step 7. Repair or replace it. Then confirm that the malfunction symptom is eliminated.
STEP 7. Check the fuel pressure.
STEP 8. Check the spark plugs.
STEP 9. Check the ignition coil.
STEP 10. Check the positive crankcase ventilation system.