DESCRIPTION
When the ignition switch is turned to the ON position, the battery voltage is applied to terminal IGSW of the ECM. The ECM MREL output signal causes a current to flow to the coil, closing the contacts of the EFI relay and supplying power to terminal +B of the ECM.
If the ignition switch is turned off, the ECM holds the EFI relay ON for a maximum of 2 seconds to allow for the initial setting of the throttle valve.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 INSPECT ECM (+B VOLTAGE)
Standard voltage
2 CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND)
Standard resistance: Check for open
3 INSPECT ECM (IGSW VOLTAGE)
Standard voltage
4 CHECK FUSE (IGN FUSE)
Standard resistance: Below 1 Ω
5 CHECK HARNESS AND CONNECTOR (IGNITION SWITCH - ECM)
Standard resistance: Check for open
Check for short
6 INSPECT IGNITION SWITCH ASSEMBLY
7 CHECK FUSE (AM2 FUSE)
Standard resistance: Below 1 Ω
REPAIR OR REPLACE HARNESS OR CONNECTOR (IGNITION SWITCH - BATTERY)
8 INSPECT ECM (MREL VOLTAGE)
Standard voltage
9 CHECK FUSE (EFI NO.1 FUSE)
Standard resistance: Below 1 Ω
10 INSPECT RELAY (EFI RELAY)
Standard resistance
11 CHECK HARNESS AND CONNECTOR (EFI RELAY - ECM)
Standard resistance: Check for open
Check for short
12 CHECK HARNESS AND CONNECTOR (EFI RELAY - ECM)
Standard resistance: Check for open
Check for short
13 CHECK HARNESS AND CONNECTOR (EFI RELAY - BODY GROUND)
Standard resistance : Check for open
REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI RELAY - BATTERY)
Washer Signal Circuit
DESCRIPTION
The distance control ECU detects washer operation. The cruise control will be
cancelled by the distance
control ECU if the windshield wipers operate in the HI or LO mode. By detecting
washer operation, the
distance control ECU allows the cruise control to continue even when the
...
Terminals of ECU
1. CHECK DISTANCE CONTROL ECU
Reference: waveform 1
HINT:
Terminal: LRDD - SGND
Gauge set: 2 V/DIV., 10 ms./DIV.
Condition: ignition switch in the ON position
Reference: waveform 2
HINT:
Terminal: LRRD - SGND
Gauge set: 2 V/ ...
Changing the vehicle-to-vehicle distance
Pressing the button changes the
vehicle-to-vehicle distance as follows:
Long
Medium
Short
The vehicle-to-vehicle distance is
set automatically to long mode
when the engine switch is turned to
IGNITION ON mode.
If a vehicle is running ahead of
you, the preceding vehicle mark
w ...