2019 Infiniti M35 V6-3.5L (VQ35HR) Diagnostic and Repair Information Page 643
3.CHECK THROTTLE CONTROL MOTOR RELAY INPUT SIGNAL CIRCUIT
1. Disconnect IPDM E/R harness connector E9.
2. Check the continuity between IPDM E/R sensor harness connector and ECM harness connector.
3. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES - GO TO 5.
NO - GO TO 4.
4.DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E12, F3
- Harness for open or short between ECM and IPDM E/R
- Repair open circuit, short to ground or short to power in harness or connectors.
5.CHECK FUSE
1. Disconnect 15 A fuse (No. 87) from IPDM E/R.
2. Check 15 A fuse for blown.
Is the inspection result normal?
YES - GO TO 6.
NO - Replace 15 A fuse.
6.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 IPDM E/R.
NO - Repair or replace harness or connectors.
P1421
P1421 COLD START CONTROL
Description
ECM controls ignition timing and engine idle speed when engine is started with pre-warming up condition.
This control promotes the activation of three way catalyst by heating the catalyst and reduces emissions.
DTC Logic
DTC DETECTION LOGIC
NOTE:
- If DTC P1421 is displayed with other DTC, first perform the trouble diagnosis for other DTC.
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.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 11 V at idle.
- GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT-III
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Select "DATA MONITOR" mode with CONSULT-III.
