2019 Infiniti M35 V6-3.5L (VQ35HR) Diagnostic and Repair Information Page 644
4. Check the indication of "COOLAN TEMP/S".
If it is between 7锟紺 (45锟紽) and 36锟紺 (97锟紽), go to the following steps.
If it is below 7锟紺 (45锟紽), warm engine up to more than 7锟紺 (45锟紽) and retry from step 1.
If it is above 36锟紺 (97锟紽), cool engine down to less than 36锟紺 (97锟紽) and retry from step 1.
5. Start engine and let it idle for 5 minutes.
6. Check 1st trip DTC.
With GST
Follow the procedure "With CONSULT-III" above.
Is 1st trip DTC detected?
YES - Go to See: P Code Charts/P1421.
NO - INSPECTION END
Diagnosis Procedure
1.PERFORM IDLE AIR VOLUME LEARNING
Perform See: Engine, Cooling and Exhaust/Engine/Tune-up and Engine Performance Checks/Idle Speed/Testing and Inspection/Programming and
Relearning/Special Repair Requirement.
Is Idle Air Volume Learning carried out successfully?
YES - GO TO 2.
NO - Follow the instruction of Idle Air Volume Learning.
2.CHECK INTAKE SYSTEM
Check for the cause of intake air volume lacking. Refer to the following.
- Crushed intake air passage
- Intake air passage clogging
Is the inspection result normal?
YES - GO TO 3.
NO - Repair or replace malfunctioning part
3.CHECK FUEL INJECTION SYSTEM FUNCTION
Perform DTC Confirmation Procedure for DTC P0171, P0174. See: P Code Charts/P0171.
Is the inspection result normal?
YES - GO TO 4.
NO - Go to See: P Code Charts/P0171 for DTC P0171, P0174.
4.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Erase DTC.
3. Perform DTC Confirmation Procedure.
See See: P Code Charts/P1421.
Is the 1st trip DTC P1421 displayed again?
YES - GO TO 5.
NO - INSPECTION END
5.REPLACE ECM
1. Replace ECM.
2. Go to See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Programming and Relearning/Additional Service
When Replacing Control Unit/Special Repair Requirement.
- INSPECTION END
P1550
P1550 BATTERY CURRENT SENSOR
Description
The power generation voltage variable control enables fuel consumption to be decreased by reducing the engine load which is caused by the
power generation of the generator. The battery current sensor is installed to the battery cable at the negative terminal. The sensor measures the
charging/discharging current of the battery. Based on the sensor signal, ECM judges whether or not the power generation voltage variable control
is performed. When performing the power generation voltage variable control, ECM calculates the target power generation voltage based on the
sensor signal. And ECM sends the calculated value as the power generation command value to IPDM E/R. For the details of the power generation
voltage variable control, See: Starting and Charging/Charging System/Description and Operation.
CAUTION:
Never connect the electrical component or the ground wire directly to the battery terminal. The connection causes the malfunction of the
power generation voltage variable control, and then battery discharge may occur.
