General Information: Wiring Nissan Frontier D40

HARNESS WIRE COLOR AND CONNECTOR NUMBER INDICATION

There are two types of harness wire color and connector number indication.

Scheme 19

1. Letter designations next to test meter probe indicate harness wire color.
2. Connector numbers in a single circle (e.g. M33) indicate harness connectors.
3. Connector numbers in a double circle indicate component connectors. (Scheme 19): Identifying Harness Indication And Component

Checking Circuit Continuity Between Intake Sensor Harness Connector Terminal And Auto Amp. Harness Connector Terminal. Scheme 20

Identifying Key Symbols Signifying Measurements And Procedures. Scheme 21

Identifying Key Symbols Signifying Measurements And Procedures. Scheme 22

Harness Indication

1. Letter designations next to test meter probe indicate harness (connector) wire color.
2. Connector numbers in a single circle M33 indicate harness connectors. see scheme 24: Identifying Harness Indication And Component

Probing from Harness Side

Standard type (not waterproof type) connector should be probed from harness side with "T" pin.

Scheme 23

1. If the connector has a rear cover such as a ECM connector, remove the rear cover before probing the terminal.
2. Do not probe waterproof connector from harness side. Damage to the seal between wire and connector may result. (Scheme 23): Checking Digital Multimeter (DMM)

Scheme 24

Scheme 25

1. There is a small notch above each female terminal. Probe each terminal with the "T" pin through the notch. Do not insert any object other than the same type male terminal into female terminal. (Scheme 24): Checking Terminal With T Pin Through Notch
2. Some connectors do not have a notch above each terminal. To probe each terminal, remove the connector retainer to make contact space for probing. (Scheme 25): Identifying Connector Retainer

CONNECTORS & HARNESS

Determine which connectors and wiring harness would affect the electrical system you are inspecting. Gently shake each connector and harness while monitoring the system for the incident you are trying to duplicate. This test may indicate a loose or poor electrical connection.