MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-596
STEP 11. Using scan tool MB991502, check data list item
69: Right Bank Heated oxygen sensor (rear).
CAUTION
To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Start the engine and run at idle.
(3) Set scan tool MB991502 to the data reading mode for item
69, Right Bank Heated Oxygen Sensor (rear).
•
Average voltage should be 0.6 volt or less, when idling.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?
YES :
Go to Step 16.
NO :
Replace the right bank heated oxygen sensor (front).
Then confirm that the malfunction symptom is
eliminated.
STEP 12. Using scan tool MB991502, check data list item
11: Left Bank Heated oxygen sensor (front).
(1) Start the engine and run at idle.
(2) Set scan tool MB991502 to the data reading mode for item
11, Left Bank Heated Oxygen Sensor (front).
•
Warm up the engine. When the engine is decelerated
suddenly from 4,000 r/min, the output voltage should
increase from 200 mV or less to 600
−
1,000 mV in a
few seconds.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?
YES :
Go to Step 13.
NO :
Go to Step 15.
STEP 13. Check the EGR system.
Refer to GROUP 17, Emission Control System
−
EGR System
Check
.
Q: Is the EGR system normal?
YES :
Go to Step 14.
NO :
Repair or replace. Then confirm that the malfunction
symptom is eliminated.
AKX01177
16 PIN
MB991502
AB
AKX01177
16 PIN
MB991502
AB
