Components

C03

C04

C08

C11

C12

C16

C21-2

C21-4

C22-3

C23-4

C24-1

C33

C35

C45

C46-1

E30

M05

M06

M13-1

M50

M62

M63

Connectors

EM04

E/R-D

E/R-G

I/P-B

I/P-L

I/P-M

I/P-P

MC02

MC03

MM02

MM03

Grounds

G01

G07

G09

Engine coolant temperature sensor & sender (I4)

Engine coolant temperature sensor & sender (V6)

Transaxle range switch

Oil pressure switch (I4)

Oil pressure switch (V6)

Brake fluid level sensor

PCM (I4 with A/T)

PCM (I4 with A/T)

ECM (I4 with A/T)

ECM (V6)

ECM (V6)

Joint connector

Joint connector

Sport mode switch

Vehicle speed sensor (I4 with M/T)

DRL control module

Joint connector

Joint connector

ETACM

Parking brake switch

Fuel sender & Fuel pump motor

Fuel sender

Location reference-page

Circuit Description

The operation of individual indicators & gauges is stated below. For indicators not listed below (for instance, door ajar, seat belt, etc.), see the system indicated by the circuit schematic diagrams.

Oil Pressure Indicator

Battery voltage is applied to the indicator bulb from fuse 19 with the ignition in ON or START. When the oil pressure is low, the oil pressure switch closes, providing a ground for the indicator bulb. Due to the oil pressure not present when the engine is not running, and the ignition is ON, the pressure switch remains closed.

CHECK ENGINE Indicator

Battery voltage is applied to the indicator bulb from fuse 19 with the ignition in ON or START. The ground of the indicator is controlled by the engine control module. The control module will light the indicator when the engine is not running or when it detects a problem.

Parking Brake

With the ignition switch in ON or START, battery voltage is applied from fuse 19 to the brake warning light. When the brake is applied, the switch closes and provides a ground for the light. The brake warning light goes on to remind the driver that the parking brake is applied.

Brake Fluid Level

With the ignition switch in ON or START, battery voltage is applied from fuse 19 to the brake warning light. If the brake fluid level is low, the brake fluid level switch closes and ground is provided to the circuit. The brake warning light lights to warn the driver of low brake fluid level in the brake master cylinder. (Note : Check brake pad wear before adding fluid.)

Speedometer

With the ignition switch in ON and START, the speedometer drive circuit receives pulses from the vehicle speed sensor. The pulse rate increases as the car accelerates. The frequency and duration of these input pulses are measured and displayed by the speedometer.

Tachometer

The tachometer displays engine speed in rpm. Voltage pulses are taken from the ignition system and sent to the tachometer by the ECM. The tachometer responds to the frequency of the voltage pulses, which vary according to engine speed.