DESCRIPTION
The headlight leveling ECU assembly receives the vehicle speed signal from the combination meter assembly.
HINT:
WIRING DIAGRAM
1. for 2GR-FE
2. for 1AR-FE
PROCEDURE
1. |
CHECK COMBINATION METER SYSTEM |
(a) The circuits that send vehicle speed signals to this system are inspected in the meter section (See page ).
(b) During inspection for the meter system, if there is an instruction that indicates to go back to inspections for the lighting system, proceed to the next step.
|
2. |
CHECK HARNESS AND CONNECTOR (HEADLIGHT LEVELING ECU ASSEMBLY - COMBINATION METER ASSEMBLY) |
(a) Disconnect the E1 combination meter assembly connector. |
|
(b) Disconnect the A40 headlight leveling ECU assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
A40-16 (SPDR) - E1-16 (+S) |
Always |
Below 1 Ω |
*1 |
Front view of wire harness connector (to Combination Meter Assembly) |
*2 |
Front view of wire harness connector (to Headlight Leveling ECU Assembly) |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR (WIPER RELAY - COMBINATION METER) |
|
3. |
INSPECT COMBINATION METER ASSEMBLY (OUTPUT WAVEFORM) |
(a) Check the output waveform. (1) Remove the combination meter assembly with the connector still connected. (2) Connect an oscilloscope to terminal E1-16 (+S) and body ground. (3) Turn the ignition switch to ON. (4) Check the signal waveform according to the condition(s) in the table below.
OK: The waveform is displayed as shown in the illustration. Text in Illustration
HINT: When the system is functioning normally, one wheel revolution generates 4 pulses. As the vehicle speed increases, the width indicated by (A) in the illustration narrows. |
|
OK |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
NG |
REPLACE COMBINATION METER ASSEMBLY |
Tcm
Components
COMPONENTS
ILLUSTRATION
Removal
REMOVAL
CAUTION / NOTICE / HINT
NOTICE:
If automatic transmission parts are replaced, refer to Parts Replacement Compensation
Table to determine if any additional operations are necessary (See page
). ...
Hydraulic Test
HYDRAULIC TEST
1. PERFORM HYDRAULIC TEST
(a) Measure the line pressure.
CAUTION:
The line pressure test should always be carried out with at least 2 people. One
person should observe the condition of wheels and wheel chocks while the other is
perform ...
Abbreviations Used In Manual
ABBREVIATIONS USED IN MANUAL
Abbreviation
Meaning
ABS
Anti-Lock Brake System
A/C
Air Conditioner
AC
Alternating Current
ACC
A ...