DI−41

DIAGNOSTICS − AUTOMATIC TRANSMISSION (A45DE)

DI336−02

Pattern Select Switch Circuit

CIRCUIT DESCRIPTION
The Engine & ECT ECU memory contains the shift programs for the NORMAL, POWER and SNOW (w/
SNOW mode) patterns, 2 range, L range and the lock−up patterns. By following the programs corresponding
to the signals from the pattern select switch, the neutral start switch and other various sensors, the Engine
& ECT ECT switches the solenoid valves ON and OFF, and controls the transaxle gear change and the lock−
up clutch operation.

WIRING DIAGRAM
Engine ECT & ECU

J16 ECT Pattern

Junction Select Switch
Connector
NORM 24 11 8
R−L A A R−L 3 2 B B B B
IQ1 BG5 E6 P
PWR

1I 2 Center J/B

B
GAUGE
Combination Meter
(ECT PWR Indicator)

1N 3 14 11
Ignition Switch C8 C10

B−Y 2 4
IG1 AM1 W−B

A
W J17
Junction
R/B No. 2 Connector
1 AM1 2 A
W
2 2
W−B

W−B
IQ2 7 F/L Box
W 2 W 2 MAIN
EF2 W−B

Battery
IH II

D04739

HIACE SUP (RM670E)

DI−42
DIAGNOSTICS − AUTOMATIC TRANSMISSION (A45DE)

INSPECTION PROCEDURE

1 Check PATTERN SEL SW signal.

ON
PREPARATION:
Turn the ignition switch ON.
CHECK:
P Measure voltage between terminal each of P of Engine & ECT
ECU and body ground when the pattern select switch is set to
(−) (+)
the PWR (POWER) or NORM (NORMAL) position.
OK:
Switch position Tester connection Specified condition
D04725
PWR P − Body ground 9 − 14 V
NORM P − Body ground Below 1.5 V
HINT:
The Engine & ECT ECU uses the normal pattern signal if the P
signal are not input.

OK Proceed to next circuit inspection shown in

symptom problems table (See page DI−16).

NG

2 Check pattern select switch

PREPARATION:
2 Disconnect the pattern select switch connector.
CHECK:
Check continuity between terminals 2 and 3 of pattern select
switch connector when the select switch is set to PWR or NORM
position.
3 OK:
Switch position Tester connection Specified condition
D04731
PWR 2−3 Continuity
NORM 2−3 No continuity

NG Replace the pattern select switch.

OK

HIACE SUP (RM670E)

 DI−43
DIAGNOSTICS − AUTOMATIC TRANSMISSION (A45DE)

3 Check harness and connector between battery and pattern select switch, pattern
select switch and Engine & ECT ECU (See page IN−30).

NG Repair or replace the harness or connector.

OK

Check and replace the Engine & ECT ECU

(See page IN−30).

HIACE SUP (RM670E)