Lexus ES300 (1997 year). Service manual — part 308
P00495
Outside
Inside
DI–8
–
DIAGNOSTICS
ENGINE
160
1997 LEXUS ES300 (RM511U)
3
Does engine start ?
NO
Go to step 7.
YES
4
Check air filter.
PREPARATION:
Remove the air filter.
CHECK:
Visual check that the air filter is not dirty or excessive oily.
HINT:If necessary, clean the filter with compressed air. First
blow from inside thoroughly, then blow from outside of filter.
NG
Repair or replace.
OK
5
Check engine idle speed.
PREPARATION:
(a)
Warm up engine to normal operating temperature.
(b)
Switch off all accessories.
(c)
Switch off air conditioning.
(d)
Shift transmission into ”N” position.
(e)
Connect the OBD II scan tool or LEXUS hand–held tester to DLC3 on the vehicle.
CHECK:
Use CURRENT DATA to check the idle speed.
OK:
Idle speed: 650
∼
750 rpm
NG
Proceed to problem symptoms table on
page
OK
A00209
DLC1
TE1
E1
SST
DLC1
P12915
P12952
P20186
–
DIAGNOSTICS
ENGINE
DI–9
161
1997 LEXUS ES300 (RM511U)
6
Check ignition timing.
PREPARATION:
(a)
Warm up engine to normal operating temperature.
(b)
Switch off all accessories.
(c)
Switch off air conditioning.
(d)
Shift transmission into ”N” position.
(e)
Keep the engine speed at idle.
(f)
Using SST, connect terminals TE1 and E1 of the DLC1.
SST
09843 – 18020
(g)
Using a timing light, connect the tester to check wire.
CHECK:
Check ignition timing.
OK:
Ignition timing: 10
° BTDC at idle
NG
troubleshoot.
OK
Proceed to problem symptoms table on page
7
Check fuel pressure.
PREPARATION:
(a)
Be sure that enough fuel is in the tank.
(b)
Connect the LEXUS hand–held tester to the DLC3.
(c)
Turn ignition switch ON and push LEXUS hand–held tes-
ter main switch ON.
(d)
Use ACTIVE TEST mode to operate the fuel pump.
(e)
If you have no LEXUS hand–held tester, connect the pos-
itive (+) and negative (–) leads from the battery to the fuel
pump connector (See page
).
CHECK:
Check that the pulsation damper screw rises up when the fuel
pump operates.
NG
and continue to
troubleshoot.
OK
P23917
DI–10
–
DIAGNOSTICS
ENGINE
162
1997 LEXUS ES300 (RM511U)
8
Check for spark.
PREPARATION:
(a)
Remove the ignition coil or disconnect the high–tension
cord from spark plug.
(b)
Remove the spark plug.
(c)
Install the spark plug to the ignition coil or high–tension
cord.
(d)
Disconnect the injector connector.
(e)
Hold the end about 12.5 mm (0.5 in.) from the ground.
CHECK:
Check if spark occurs while engine is being cranked.
NOTICE:To prevent excess fuel being injected from the in-
jectors during this test, don’t crank the engine for more
than 5
∼
10 seconds at a time.
OK:
Spark jumps across electrode gap.
NG
troubleshoot.
OK
Proceed to problem symptoms table on page
–
DIAGNOSTICS
ENGINE
DI–11
163
1997 LEXUS ES300 (RM511U)
7.
ENGINE OPERATING CONDITION
NOTICE:The values given below for ”Normal Condition” are representative values, so a vehicle may
still be normal even if its value from those listed here. So do not decide whether a part is faulty or
not solely according to the ”Normal Condition” here.
(a)
CARB mandated signals.
LEXUS hand–held tester display
Measurement Item
Normal Condition*
FUEL SYS #1
Fuel System Bank 1
OPEN: Air–fuel ratio feedback stopped
CLOSED: Air–fuel ratio feedback operating
Idling after warming up: CLOSED
FUEL SYS #2
Fuel System Bank 2
OPEN: Air–fuel ratio feedback stopped
CLOSED: Air–fuel ratio feedback operating
Idling after warming up: CLOSED
CALC LOAD
Calculator Load:
Current intake air volume as a proportion of max.
intake air volume
Idling: 13.1
∼
18.7%
Racing without load (2,500rpm): 11.7
∼
17.3%
COOLANT TEMP.
Engine Coolant Temp. Sensor Value
After warming up: 80
∼
95
°
C (176
∼
203
°F)
SHORT FT #1
Short–term Fuel Trim Bank 1
0
±
20%
LONG FT #1
Long–term Fuel Trim Bank 1
0
±
20%
SHORT FT #2
Short–term Fuel Trim Bank 2
0
±
20%
LONG FT #2
Long–term Fuel Trim Bank 2
0
±
20%
ENGINE SPD
Engine Speed
Idling: 650
∼
750
rpm
VEHICLE SPD
Vehicle Speed
Vehicle stopped: 0 km/h (0 mph)
IGN ADVANCE
Ignition Advance:
Ignition Timing of Cylinder No. 1
Idling: BTDC 10
∼
25.0
°
INTAKE AIR
Intake Air Temp. Sensor Value
Equivalent to Ambient Temp.
MAF
Air Flow Rate Through Mass Air Flow Meter
Idling: 3.3
∼
4.7
gm/sec.
Racing without load (2,500 rpm):
10.4
∼
15.4 gm/sec.
THROTTLE POS
Voltage Output of Throttle Position Sensor
Calculated as a percentage:
0 V
→
0%, 5 V
→
100%
Throttle valve fully closed: 7
∼
11%
Throttle valve fully open: 65
∼
75%
O2S B1, S1
Voltage Output of Oxygen Sensor
Bank 1, Sensor 1
Idling: 0.1
∼
0.9
V
O2FT B1, S1
Oxygen Sensor Fuel Trim Bank 1, Sensor 1
(Same as SHORT FT #1)
0
±
20%
O2S B1, S2
Voltage Output of Oxygen Sensor
Bank 1, Sensor 2
Driving 50 km/h (31 mph): 0.1
∼
0.9
V
O2S B2, S1
Voltage Output of Oxygen Sensor
Bank 2, Sensor 1
Idling: 0.1
∼
0.9
V
O2FT B2, S1
Oxygen Sensor Fuel Trim Bank 2, Sensor 1
(Same as SHORT FT #2)
0
±
20%
∗
: If no conditions are specifically stated for ”ldling”, it means the shift lever is at N or P position, the A/C switch
is OFF and all accessory switches are OFF.
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