STARTER MOTOR 17934 S114-932 23300-EY00A 23300-EY00C S114932 17934N S114932A S114932B S114932C 23300-EY00D 23300EY00D for Infiniti EX37 Q40 Q70 Nissan 370Z

• High Voltage Shock Hazard: The 12V system can produce high currents. The negative battery cable must be disconnected before installation.

• Rotating Parts: Ensure clothing and tools are kept away from the flywheel and pinion gear.

• Short Circuit Prevention: Ensure the positive terminal insulation is intact.

I. Preparation and Tools

• Tools: Socket wrench set (10mm, 14mm, 17mm), Torque wrench (essential), extension bars, universal joint, needle-nose pliers.

• Cleaning Materials: Wire brush, sandpaper, industrial alcohol (for cleaning terminals and mounting surfaces).

• Parts: New starter, insulating washers, lock nuts, wire harness clips.

II. Installation Procedure (Standard Process)

1. Mechanical Installation (Alignment and Mounting)

• Clean Mounting Surfaces:

• Thoroughly clean the mounting surface on the engine/transmission, removing oil, rust, and debris.

• Positioning and Preliminary Installation:

• Place the new starter onto the mounting dowel pins.

• Note: Ensure the pinion gear aligns with the flywheel ring gear without binding.

• Tighten Bolts (Critical Torque):

• Install the main mounting bolts (typically 2). First, snug them to 10‑15 N·m.

• Use a torque wrench to tighten to factory specifications: Main bolts: 37‑45 N·m (37 N·m is common for Infiniti), Bracket bolts: 8.4 N·m.

• Warning: Do not use excessive force with long bars; this will strip threads or crack the housing.

• Alignment Check:

• Manually rotate the starter (if possible) to ensure no interference between the pinion and flywheel.

2. Electrical Connections (Wiring)

• Connect Control Plug (S Terminal):

• Connect the solenoid control plug (S terminal) and secure the harness clip.

• Connect B+ Terminal:

• Install the insulating washer on the B+ terminal (thick wire).

• Tighten the nut to 9.8‑10 N·m.

• Install the terminal protection cover and secure the harness bracket to 8.4 N·m.

• Ground Connection:

• Ensure good metal contact between the starter housing and the engine block. If necessary, sand the contact surfaces to ensure ground resistance ≤0.1Ω.

3. System Testing and Verification

• Restore Power: Reconnect the negative battery cable.

• Functional Test:

• Turn the ignition to START. The starter should engage immediately without grinding.

• Release the key; the starter should disengage immediately.

• Voltage Measurement:

• Use a multimeter to measure the B+ terminal voltage during cranking.

• Voltage Drop: Should be ≤0.5V during cranking.

• Charging Voltage: Should be 13.5‑14.7V at idle.

I. Electrical System Safety (Core Taboos)

• Action: Before reconnecting the negative battery cable, all wires on the starter (including the small S-terminal plug and the large B+ wire) must be connected.

• Consequence: Infiniti vehicles are equipped with complex Intelligent Power Distribution Modules (IPDM). If the starter control circuit is plugged or unplugged while the battery is connected, the resulting voltage spike can easily burn out the driver circuits inside the IPDM or ECM (Engine Control Module).

• Detail: The B+ main power terminal (usually an M6 or M8 nut) on Infiniti starters is directly exposed in the engine compartment.

• Hazard: A loose terminal causes high-current poor contact, generating high-temperature arcing that can melt the terminal post or even ignite surrounding wiring harnesses.

• Requirement: A lock washer must be used and tightened to the specified torque (typically 9.8-11 N·m). Always install the factory-supplied red insulating protective cap to prevent short circuits from falling metal tools.

• Action: Check for paint, oil, or sealant residue between the starter mounting surface and the engine block.

• Reason: The starter operates at extremely high currents (200A-400A). If grounding is poor, current will seek other paths (such as through the transmission housing or harness shielding), leading to weak cranking or burning out other sensor interfaces.

II. Mechanical Installation & Engagement (Lifespan Critical)

• Phenomenon: Infiniti VQ series (V6) and VR series (Turbo) engines have compact spaces; the starter is usually located under the engine.

• Check: Before installation, ensure the Dowel Pin is intact. After placing the starter, it should seat against the block under its own weight, and the bolts should thread in easily by hand. If threading is difficult, never force them, as this will strip the threads or crack the starter housing.

• Sequence: All bolts must be snugged first, then tightened to standard torque (typically 37-44 N·m) using a torque wrench in a diagonal sequence (if more than two bolts) or alternating fashion.

• Action: With the battery disconnected, apply power to the starter solenoid (requires professional technician) to extend the drive gear and check the end gap with the flywheel ring gear.

• Standard: When extended, the drive gear should maintain a gap of 2.5mm - 5mm with the flywheel ring gear. If the gap is too small, there will be a "gear clash" sound during startup; if too large, engagement will lag, causing grinding.

• Simplified Method: After installation, manually rotate the crankshaft (via the crankshaft pulley bolt) to confirm there is no mechanical interference between the starter drive gear and the flywheel ring gear.

• Detail: On some Infiniti models (e.g., Q50 3.0T), the starter is located very close to the catalytic converter or exhaust manifold.

• Note: During installation, verify that the Heat Shield is installed correctly. High temperatures accelerate insulation aging inside the starter, leading to "no-crank when hot" failures.

III. Functional Logic & Control Strategy (Specific Technical Points)

• Applicable to: Models equipped with Auto Start-Stop (e.g., Q50, QX50).

• Note: The starter for these models is a reinforced version (dual-coil or reinforced brushes). Never replace it with a standard starter, otherwise the new unit will burn out within days due to frequent cycling. After replacement, some models may require "Initialization" or "Battery Sensor Reset" via the Consult-III diagnostic tool.

• References：

I. Core Authoritative Sources (Nissan/Infiniti OEM)

• Applicable Chapters: Section PG (Power Plant Frame) → Starter → Installation; for some models, refer to Section SC (Starting System) → Starter Motor → Removal/Installation.

• Key Location Points: Contains critical parameters such as main mounting bolt torque (37‑45 N·m), B+ terminal torque (9.8 N·m), dowel pin alignment, drive gear-to-flywheel clearance, electrical connection sequence, and IPDM/ECM protection logic.

• Access: Nissan/Infiniti NERS (Nissan Electronic Service System) subscription, authorized dealer internal systems, or model-specific physical/electronic service manuals.

• Search Path: Service Manual Table of Contents → Engine → Power Plant Frame → Starter → Installation Notes; or Starting System → Starter → Torque Specifications.

• Applicable Topics: Cases involving grinding noise after installation, weak cranking, IPDM burnout, abnormal voltage drop, and immobilizer/shift interlock failures.

• Key Location Points: Supplements manual details, such as flywheel ring gear inspection specifications for the VQ35/VQ37 series, ESS (Eco Start Stop) initialization procedures, and wiring harness routing optimizations.

• Access: Authorized dealer technical departments, third-party repair databases (e.g., Alldata, Mitchell1).

• Search Path: TSB Database → Search for keywords like "Starter Installation," "Starting System No‑Crank," or "Voltage Drop."

• Key Location Points: Installation specifications from brands commonly supplied with Infiniti vehicles, including solenoid pre-checks, overrunning clutch clearance (0.3‑2.5mm), and insulation resistance standards (≥1MΩ).

• Access: Brand official websites, authorized dealer technical documentation.

• Search Path: Hitachi/Denso Starter Service Guide → Installation Precautions → Mechanical & Electrical Checks.

II. General Standards and Industry Norms

• SAE J563: 12V Starting system electrical safety and performance standard, covering voltage drop (≤0.2V), terminal insulation, and ground circuit requirements.

• ISO 15500: Road vehicle starter installation and maintenance specifications, including mechanical alignment, torque control, and harness protection.

• Nissan Service Data and Specifications (SDS): Defines factory parameters such as starter no-load current, drive gear clearance, and insulation resistance.