2019 Infiniti M35 V6-3.5L (VQ35HR) Diagnostic and Repair Information Page 477
Spark should be generated.
Is the inspection result normal?
YES - INSPECTION END
NO - Replace spark plug(s) with standard type one(s). For spark plug type, See: Maintenance.
10.CHECK FUEL INJECTOR
1. Turn ignition switch OFF.
2. Remove fuel injector assembly. See: Powertrain Management/Fuel Delivery and Air Induction/Fuel Rail/Service and Repair/Removal and
Installation.
Keep fuel hose and all fuel injectors connected to fuel tube.
3. Disconnect all ignition coil harness connectors.
4. Reconnect all fuel injector harness connectors disconnected.
5. Turn ignition switch ON.
Does fuel drip from fuel injector?
YES - Replace the fuel injector(s) from which fuel is dripping.
NO - GO TO 11.
11.CHECK INTERMITTENT INCIDENT
See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Initial Inspection and Diagnostic Overview/Trouble
Diagnosis For Intermittent Incident/Description.
Is the inspection result normal?
YES - Replace three way catalyst assembly.
NO - Repair or replace harness or connector.
P0430
P0420, P0430 THREE WAY CATALYST FUNCTION
DTC Logic
DTC DETECTION LOGIC
The ECM monitors the switching frequency ratio of air fuel ratio (A/F) sensor 1 and heated oxygen sensor 2.
A three way catalyst 1 with high oxygen storage capacity will indicate a low switching frequency of heated oxygen sensor 2. As oxygen storage
capacity decreases, the heated oxygen sensor 2 switching frequency will increase.
When the frequency ratio of A/F sensor 1 and heated oxygen sensor 2 approaches a specified limit value, the three way catalyst 1 malfunction is
diagnosed.
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
Will CONSULT-III be used?
YES - GO TO 2.
NO - GO TO 6.
2.PERFORM DTC CONFIRMATION PROCEDURE-I
With CONSULT-III
TESTING CONDITION:
Do not maintain engine speed for more than the specified minutes below.
1. Turn ignition switch ON and select "DATA MONITOR" mode with CONSULT-III.
