Content .. 532 533 534 535 ..

Honda Element. Manual - part 534

Fig. 27: Identifying ECM/PCM Connector E (31P)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

ECM/PCM CONNECTOR E REFERENCE

RED

ACC (A/C CLUTCH
RELAY)

Drives A/C clutch relay

about 0 V
With compressor OFF:
battery voltage

GRN/RED

VSV (EVAPORATIVE
EMISSION (EVAP)
CANISTER VENT SHUT
VALVE)

Drives EVAP canister
vent shut valve

With ignition switch ON
(II): battery voltage

(1)

A/T

NOTE:

Standard battery voltage is about 12 V.

Terminal

number

Wire
color

Terminal name

Description

Signal

WHT/RED

SHO2S (SECONDARY HEATED
OXYGEN SENSOR
(SECONDARY HO2S), SENSOR
2)

Detects secondary
HO2S (sensor 2)
signal

With throttle fully closed
at idle and fully warmed
up engine: above 0.6 V
With throttle quickly
closed: below 0.4 V

GRN/RED

SO2SHTC (SECONDARY
HEATED OXYGEN SENSOR
(SECONDARY HO2S) HEATER
CONTROL)

Drives secondary
HO2S heater

With ignition switch ON
(II): battery voltage With
fully warmed up engine
running: duty controlled

WHT/BLK

BKSW (BRAKE PEDAL
POSITION SWITCH)

Detects brake pedal
position switch
signal

With brake pedal
released: about 0 V With
brake pedal pressed:
battery voltage

RED

CANL (CAN COMMUNICATION
SIGNAL LOW)

Sends
communication
signal

With ignition switch ON
(II): pulses

WHT

IMOCD (IMMOBILIZER CODE)

Detects
immobilizer signal

2007 Honda Element EX

2007-2008 ENGINE PERFORMANCE Fuel and Emissions Systems - Element

PGM-FI SYSTEM

The programmed fuel injection (PGM-FI) system is a sequential multiport fuel injection system.

Air Conditioning (A/C) Compressor Clutch Relay

When the ECM/PCM receives a demand for cooling from the A/C system, it delays the compressor from being
energized, and enriches the mixture to assure smooth transition to the A/C mode.

Air Fuel Ratio (A/F) Sensor

The A/F sensor operates over a wide air/fuel range. The A/F sensor is installed upstream of the three way
catalytic converter (TWO. It sends signals to the ECM/PCM which varies the duration of fuel injection
accordingly.

Fig. 28: Sectional View Of Air Fuel Ratio (A/F) Sensor
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Barometric Pressure (BARO) Sensor

The BARO sensor is inside the ECM/PCM. It converts atmospheric pressure into a voltage signal that modifies
the basic duration of the fuel injection discharge.

Camshaft Position (CMP) Sensor B

CMP sensor B detects the position of the No. 1 cylinder as a reference for sequential fuel injection to each
cylinder.

BRN

SCS (SERVICE CHECK
SIGNAL)

Detects service
check signal

With service check
signal shorted using
HDS: about 0 V With
service check signal
open: about 5.0 V

RED/WHT

WEN (WRITE ENABLE
SIGNAL)

Detects write
enable signal

With ignition switch ON
(II): about 0 V

2007 Honda Element EX

2007-2008 ENGINE PERFORMANCE Fuel and Emissions Systems - Element

Fig. 29: Sectional View Of Camshaft Position (CMP) Sensor B
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Crankshaft Position (CKP) Sensor

The CKP sensor detects crankshaft speed and is used by the ECM/PCM to determine ignition timing and timing
for fuel injection of each cylinder as well as detecting engine misfire.

Fig. 30: Sectional View Of Crankshaft Position (CKP) Sensor
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Engine Coolant Temperature (ECT) Sensors 1 and 2

ECT sensors 1 and 2 are temperature dependent resistors (thermistors). The resistance decreases as the engine
coolant temperature increases.

Fig. 31: Sectional View Of Engine Coolant Temperature (ECT) Sensors 1 And 2
Courtesy of AMERICAN HONDA MOTOR CO., INC.

2007 Honda Element EX

2007-2008 ENGINE PERFORMANCE Fuel and Emissions Systems - Element

Ignition Timing Control

The ECM/PCM contains the memory for basic ignition timing at various engine speeds and manifold absolute
pressures. It also adjusts the timing according to engine coolant temperature and intake air temperature.

Injector Timing and Duration

The ECM/PCM contains the memory for basic discharge duration at various engine speeds and manifold
pressures. The basic discharge duration, after being read out from the memory, is further modified by signals
sent from various sensors to obtain the final discharge duration.

By monitoring long term fuel trim, the ECM/PCM detects long term malfunctions in the fuel system and sets a
diagnostic trouble code (DTC).

Knock Sensor

The knock sensor adjusts the ignition timing to minimize knock.

Fig. 32: Sectional View Of Knock Sensor
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Malfunction Indicator Lamp (MIL) Indication (In relation to Readiness Codes)

The vehicle has certain "readiness codes" that are part of the on-board diagnostics for the emissions systems. If
the vehicle's battery has been disconnected or gone dead, if the DTCs have been cleared, or if the ECM/PCM
has been reset, these codes are reset. In some states, part of the emissions testing is to make sure these codes are
set to complete. If all of them are not set to complete, the vehicle may fail the test, or the test cannot be finished.

To check if the readiness codes are set to complete, turn the ignition switch ON (II), but do not start the engine.
The MIL will come on for 15-20 seconds. If it then goes off, the readiness codes are complete. If it flashes five
times, one or more readiness codes are not complete. To set each code, drive the vehicle or run the engine as
described in the procedures (see HOW TO SET READINESS CODES ).

Manifold Absolute Pressure (MAP) Sensor

The MAP sensor converts manifold absolute pressure into electrical signals to the ECM/PCM.

2007 Honda Element EX

2007-2008 ENGINE PERFORMANCE Fuel and Emissions Systems - Element

Content .. 532 533 534 535 ..