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, 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 1: Power Supply Voltage
- Item 6: Engine Coolant Temperature Sensor
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Is the sensor operating properly?
Go to Step 4. Repair or replace it. Then confirm that the malfunction symptom is eliminated.
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.
Is the actuator operating properly?
Go to Step 5. Repair or replace it. Then confirm that the malfunction symptom is eliminated.
STEP 5. Inspection of throttle body (throttle valve area) for dirtiness.
STEP 6. Check the ignition timing.
STEP 7. Check harness connectors B-101, B-102, B-105 and B-106 at injector for damage.
STEP 8. Check the injector.
(1) Disconnect the injector connectors B-101, B-102, B-105 and B-106.
(2) Measure the resistance between each injector side connector terminal No. 1 and No. 2.Standard value: 10.5 - 13.5 Ω [at 20°C (68°F)]
Is the measured resistance between 10.5 and 13.5 Ω [at 20°C (68°F)]?
Go to Step 9. Replace the faulty injector. Then confirm that the malfunction symptom is eliminated.
STEP 9. Check harness connector A-37X at MFI relay and harness connector A-70X at injector relay for damage.
STEP 10. Check for harness damage between MFI relay connector A-37X (terminal No. 2) and injector relay connector A-70X (terminal No. 4).
STEP 11. Check for harness damage between injector relay connector and injector connector.
STEP 12. Check the spark plugs.
STEP 13. Check the ignition coil.
STEP 14. Check the compression pressure.