What wire colors go to the auto-choke heater?

The diagram shows GY/R and G/Y wires at the auto-choke heater connector.

When is the inhibitor switch on automatic transmission models closed?

The diagram notes the inhibitor switch (A/T) is ON in "N" and "P" positions.

What fuse ratings are shown in the fuse block for this emission control circuit?

Two 15A fuses are shown in the fuse block on the lower harness diagram (SEF607E).

How does the diagram distinguish manual and automatic transmission circuits?

A legend marks circuits with (M) for M/T models and (A) for A/T models; M/T uses a speed detecting switch and 10 km/h amp, while A/T uses an inhibitor relay and inhibitor switch.

What wire colors connect to the idle speed control solenoid valve?

The connector view shows G/W and G/B wires at the idle speed control solenoid valve.

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Nissan Micra Emission Control System Wiring Diagram - Auto-Choke & Idle Circuit

Nissan electrical circuit of emission control system wiring diagram EF&EC-5 M/T and A/T

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Electrical-circuit (wiring) diagram of the emission control system showing battery, fusible link, ignition switch, anti-dieseling solenoid, auto-choke heater, idle speed control solenoid valve, relays and check connector for M/T and A/T.

AI caption June 2005 · Photo 105 of 412

This page from a Nissan factory service manual (section EF & EC, page 5) presents the "Electrical Circuit of Emission Control System." It contains two diagrams. The upper schematic (SEF045D) shows the logical circuit: power flows from the battery through a fusible link and ignition-switch fuse to the anti-dieseling solenoid, auto-choke relay and heater, throttle opener, idle speed control solenoid valve, and engine revolution unit. Manual-transmission models use a speed detecting switch with a 10 km/h amplifier, while automatic models use an inhibitor relay and inhibitor switch (closed in "N" and "P"). Connections to the alternator "L" terminal, starter motor, lighting switch, and rear defogger switch are indicated, with (M) and (A) symbols distinguishing M/T and A/T circuits. The lower diagram (SEF607E) is a harness/connector view giving wire color codes (e.g., GY/R and G/Y for the auto-choke heater; G/W and G/B for the idle speed control solenoid valve; W/L, W/R at the fuse block with two 15A fuses), an ignition switch contact table (OFF/ACC/ON/ST), and connector pinouts for the inhibitor relay, throttle opener solenoid, auto-choke relay, check connector, fusible link, and ignition relay. Useful for diagnosing emission control, auto-choke, and idle-control wiring on carbureted Nissan models.

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Frequently asked questions

What wire colors go to the auto-choke heater?: The diagram shows GY/R and G/Y wires at the auto-choke heater connector.
When is the inhibitor switch on automatic transmission models closed?: The diagram notes the inhibitor switch (A/T) is ON in "N" and "P" positions.
What fuse ratings are shown in the fuse block for this emission control circuit?: Two 15A fuses are shown in the fuse block on the lower harness diagram (SEF607E).
How does the diagram distinguish manual and automatic transmission circuits?: A legend marks circuits with (M) for M/T models and (A) for A/T models; M/T uses a speed detecting switch and 10 km/h amp, while A/T uses an inhibitor relay and inhibitor switch.
What wire colors connect to the idle speed control solenoid valve?: The connector view shows G/W and G/B wires at the idle speed control solenoid valve.