Lexus ES300 (1997 year). Manual — part 337
–
DIAGNOSTICS
ENGINE
DI–125
277
1997 LEXUS ES300 (RM511U)
3
Check harness and connector between ECM and stop light switch
(See page
).
NG
Repair or replace harness or connector.
OK
Check and replace ECM (See page
).
S05470
Battery
MAIN
FL
B–G
F6
F8
1
1
1
8
14
B
Fusible
Link
Block
Engine Room J/B
2A
2J
E7
B–Y
ECM
BATT
EFI
DI–126
–
DIAGNOSTICS
ENGINE
278
1997 LEXUS ES300 (RM511U)
DTC
P1600
ECM BATT Malfunction
CIRCUIT DESCRIPTION
Battery positive voltage is supplied to terminal BATT of the ECM even when the ignition switch is OFF for
use by the DTC memory and air–fuel ratio adaptive control value memory, etc.
DTC No.
DTC Detecting Condition
Trouble Area
P1600
Open in back up power source circuit
Open in back up power source circuit
ECM
HINT:If DTC P1600 appear, the ECM does not store another DTC.
WIRING DIAGRAM
DI0A5–01
A00241
LOCK
BATT(+)
BE6653
P24330
S04162
Engine Room J/B
EFI Fuse
–
DIAGNOSTICS
ENGINE
DI–127
279
1997 LEXUS ES300 (RM511U)
INSPECTION PROCEDURE
1
Check voltage between terminal BATT of ECM connector and body ground.
PREPARATION:
Remove the glove compartment (See page
).
CHECK:
Measure voltage between terminal BATT of ECM connector
and body ground.
OK:
Voltage: 9
∼
14 V
OK
Check and replace ECM (See page
).
NG
2
Check EFI fuse.
PREPARATION:
Remove the EFI fuse from the engine room J/B.
CHECK:
Check continuity of EFI fuse.
OK:
Continuity
NG
Check for short in all harness and components
connected to EFI fuse.
OK
Check and repair harness or connector
between battery, EFI fuse and ECM.
DI–128
–
DIAGNOSTICS
ENGINE
280
1997 LEXUS ES300 (RM511U)
DTC
P1780
Park/Neutral Position Switch Malfunction
CIRCUIT DESCRIPTION
The park/neutral position switch go on when the shift lever is in the N or P shift position. When it goes on
terminal NSW of the ECM is grounded to body ground via the starter relay, thus the terminal NSW voltage
becomes 0V. When the shift lever is in the D, 2, L or R position, the park/neutral position switch goes off,
so the voltage of ECM. Terminal NSW becomes battery voltage, the voltage of the ECM internal power
source. If the shift lever is moved from the N position to the D position, this signal is used for air–fuel ratio
correction and for idle speed control (estimated control), etc.
DTC No.
DTC Detecting Condition
Trouble Area
2 or more switches are ON simultaneously for ”N”, ”2”,
”L” and
”R” positions
(2 trip detection logic)
Sh t i
k/
t l
iti
it h i
it
P1780
When driving under conditions (a) and (b) for 30 sec. or more
the park/neutral position switch is ON (N position):
(2 trip detection logic)
(a) Vehicle speed: 70 km/h (44 mph) or more
(b) Engine speed: 1,500
∼
2,500 rpm
Short in park/neutral position switch circuit
Park/neutral position switch
ECM
HINT:After confirming DTC P1780 use the LEXUS hand–held tester to confirm the PNP switch signal from
”CURRENT DATA”.
DI0A6–01
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