Description
*: ECM determines the start signal status by the signals of engine speed and battery voltage.
The ECM activates the fuel pump for several seconds after the ignition switch is turned ON to improve engine start ability. If the ECM receives a engine speed signal from the camshaft position sensor (PHASE), it knows that the engine is rotating, and causes the pump to operate. If the engine speed signal is not received when the ignition switch is ON, the engine stalls. The ECM stops pump operation and prevents battery discharging, thereby improving safety. The ECM does not directly drive the fuel pump. It controls the ON/OFF fuel pump relay, which in turn controls the fuel pump.
Component Function Check
1.CHECK FUEL PUMP FUNCTION
: Vehicle front (Illustration
shows
the view with intake air duct removed)
Fuel pressure pulsation should be felt on the fuel feed hose for 1 second after ignition switch is turned ON.
Diagnosis Procedure
1.CHECK FUEL PUMP POWER SUPPLY CIRCUIT-I
2.CHECK FUEL PUMP POWER SUPPLY CIRCUIT-II
Check the voltage between IPDM E/R harness connector and ground.
3.DETECT MALFUNCTIONING PART
Check the following.
4.CHECK FUEL PUMP POWER SUPPLY CIRCUIT-III
5.DETECT MALFUNCTIONING PART
Check the following.
6.CHECK FUEL PUMP GROUND CIRCUIT
7.CHECK FUEL PUMP
8.CHECK INTERMITTENT INCIDENT
Component Inspection
1.CHECK FUEL PUMP
Microphone
Removal and Installation
REMOVAL
Remove the map lamp assembly. Refer to INL-84, "Removal and
Installation".
Detach the microphone connector (A).
Remove the map lamp covers (1), then remove the map lamp assembly
cover (2).
Release the microphone tabs (A), then remove the micr ...
TCM branch line circuit
Diagnosis Procedure
1.CHECK CONNECTOR
Turn the ignition switch OFF.
Disconnect the battery cable from the negative terminal.
Check the following terminals and connectors for damage, bend and
loose connection (unit side and connector
side).
TCM
Harness connector F1
Harness con ...
Service data and specifications (SDS)
Idle Speed
Ignition Timing
Calculated Load Value
Mass Air Flow Sensor
*: Engine is warmed up to normal operating temperature and running under no
load. ...