Lexus RX300 (MCU15). Manual — part 232
DI0CO–12
DI–160
–
DIAGNOSTICS
AUTOMATIC TRANSAXLE
LEXUS RX300 (RM785E)
PROBLEM SYMPTOMS TABLE
If a normal code is displayed during the diagnostic trouble code check but the trouble still occurs, check the
circuits for each symptom in the order given in the charts on the following pages and proceed to the page
given for troubleshooting.
The Matrix Chart is divided into 3 chapters.
Chapter 1: Electronic Circuit Matrix Chart
Chapter 2: On–vehicle Repair Matrix Chart
Chapter 3: Off–vehicle Repair Matrix Chart
S
If the instruction ”Proceed to next circuit inspection shown on matrix chart” is given in the flow chart
for each circuit, proceed to the circuit with the next highest number in the table to continue the check.
S
If the trouble still occurs even though there are no abnormalities in any of the other circuits, then check
and replace the Engine & ECT ECU.
1.
Chapter 1: Electronic Circuit Matrix Chart
Symptom
Suspect Area
See page
No up–shift (1st → 2nd)
Engine & ECT ECU
IN–32
No up–shift (2nd → 3rd)
Engine & ECT ECU
IN–32
No up–shift (3rd → O/D)
3. O/D main switch circuit
4. O/D cancel signal circuit
5. Engine & ECT ECU
DI–197
DI–194
IN–32
No down–shift (O/D → 3rd)
Engine & ECT ECU
IN–32
No down–shift (3rd → 2nd)
Engine & ECT ECU
IN–32
No down–shift (2nd → 1st)
Engine & ECT ECU
IN–32
No lock–up or No lock–up off
Engine & ECT ECU
IN–32
Shift point too high or too low
Engine & ECT ECU
IN–32
Up–shift to 2nd while in L range
Engine & ECT ECU
IN–32
Up–shift to 3rd while in L range
Engine & ECT ECU
IN–32
Up–shift to O/D from 3rd
1. O/D main switch circuit
2. Engine & ECT ECU
DI–197
IN–32
Up–shift to O/D from 3rd while engine is cold
Engine & ECT ECU
IN–32
Harsh engagement (N → D)
Engine & ECT ECU
IN–32
Harsh engagement (Lock–up)
Engine & ECT ECU
IN–32
Harsh engagement (Any driving range)
Engine & ECT ECU
IN–32
Poor acceleration
Engine & ECT ECU
IN–32
Large shift shock or engine stalls when starting off or stopping
Engine & ECT ECU
IN–32
No pattern select
1. Pattern select switch circuit
2. Engine & ECT ECU
DI–192
IN–32
*No kick–down
1. Kick–down switch circuit
2. Engine & ECT ECU
DI–200
IN–32
*: LHD only
–
DIAGNOSTICS
AUTOMATIC TRANSAXLE
DI–161
LEXUS RX300 (RM785E)
2.
Chapter 2: On–Vehicle Repair
(L: U140F AUTOMATIC TRANSAXLE Repair Manual Pub. No. RM848E)
Symptom
Suspect Area
See page
Vehicle does not move in any forward range and reverse range
1. Manual valve
2. Throttle valve
3. Primary regulator valve
4. Off–vehicle repair matrix chart
L
L
L
–
Vehicle does not move in R range
Off–vehicle repair matrix chart
–
No up–shift (1st → 2nd)
1. 1–2 shift valve
2. Off–vehicle repair matrix chart
L
–
No up–shift (2nd → 3rd)
1. 2–3 shift valve
2. Off–vehicle repair matrix chart
L
–
No up–shift (3rd → O/D)
1. 3–4 shift valve
2. Off–vehicle repair matrix chart
L
–
No down–shift (O/D → 3rd)
3–4 shift valve
L
No down–shift (3rd → 2nd)
2–3 shift valve
L
No down–shift (2nd → 1st)
1–2 shift valve
L
No lock–up or No lock–up off
1. Lock–up relay valve
2. Off–vehicle repair matrix chart
L
–
Harsh engagement (N → D)
1. C
1
accumulator
2. Off–vehicle repair matrix chart
L
–
Harsh engagement (N → R)
1. C
2
accumulator
2. No. 1 accumulator control valve
3. Off–vehicle repair matrix chart
L
L
Harsh engagement (N → L)
Low coast modulator valve
L
Harsh engagement (Lock–up)
1. Lock–up relay valve
2. Off–vehicle repair matrix chart
L
–
Harsh engagement (1st → 2nd → 3rd → O/D)
1. Throttle modulator valve
2. Cut back valve
3. Throttle valve
L
L
L
Harsh engagement (2nd → 3rd)
C
2
accumulator
L
Harsh engagement (3rd → O/D)
B
0
accumulator
L
Harsh engagement (O/D → 3rd)
1. C
0
accumulator
2. B
0
accumulator
L
L
Slip or shudder (Forward and reverse)
1. Throttle valve
2. Oil strainer
3. Off–vehicle repair matrix chart
L
L
–
No engine braking (1st: L range)
1. Low coast modulator valve
2. Off–vehicle repair matrix chart
L
–
No engine braking (2nd: 2 range)
1. 2nd coast modulator valve
2. Off–vehicle repair matrix chart
L
–
*No kick–down
1. 1–2 shift valve
2. 2–3 shift valve
3. 3–4 shift valve
4. Off–vehicle repair matrix chart
L
L
L
–
*: LHD only
DI–162
–
DIAGNOSTICS
AUTOMATIC TRANSAXLE
LEXUS RX300 (RM785E)
3.
Chapter 3: Off–Vehicle Repair
(L: U140F AUTOMATIC TRANSAXLE Repair Manual Pub. No. RM848E)
Symptom
Suspect Area
See page
Vehicle does not move in any forward range and reverse range
1. Front and rear planetary gear
2. U/D planetary gear
3. U/D one–way clutch (F
2
)
4. Forward clutch (C
1
)
5. U/D brake (B
3
)
L
L
L
L
L
Vehicle does not move in R range
1. Front and rear planetary gear unit
2. U/D planetary gear unit
3. Direct clutch (C
2
)
4. U/D brake (C
3
)
4. 1st and reverse brake (B
2
)
L
L
L
L
L
No up–shift (1st → 2nd)
1. No. 1 one–way clutch (F
1
)
2. 2nd brake (B
1
)
L
L
No up–shift (2nd → 3rd)
Direct clutch (C
2
)
L
No up–shift (3rd → O/D)
U/D clutch (C
3
)
L
No lock–up or No lock–up off
Torque converter
L
Harsh engagement (N → D)
1. Forward clutch (C
1
)
2. U/D one–way clutch (F
2
)
3. No. 1 one–way clutch (F
1
)
L
L
L
Harsh engagement (N → R)
1. Direct clutch (C
2
)
2. 1st and reverse brake (B
2
)
L
L
Harsh engagement (Lock–up)
Torque converter
L
Slip or shudder (Forward range: After warm–up)
1. Torque converter
2. Forward clutch (C
1
)
3. Direct clutch (C
2
)
4. U/D brake (C
3
)
5. No. 1 one–way clutch (F
1
)
6. U/D one–way clutch (F
2
)
L
L
L
L
L
L
Slip or shudder (R range)
1. Direct clutch (C
2
)
2. 1st and reverse brake (B
2
)
L
L
Slip or shudder (1st)
No. 1 one–way clutch (F
1
)
L
Slip or shudder (2nd)
1. U/D one–way clutch (F
2
)
2. 2nd brake (B
1
)
L
L
Slip or shudder (3rd)
Direct clutch (C
2
)
L
Slip or shudder (O/D)
U/D clutch (C
3
)
L
No engine braking (1st ∼ 3rd: D range)
U/D brake (B
3
)
L
No engine braking (1st: L range)
1st and reverse brake (B
2
)
L
No engine braking (2nd: 2 range)
2nd brake (B
1
)
L
Poor acceleration (All range)
1. Torque converter
2. U/D planetary gear
L
L
Poor acceleration (O/D)
1. U/D clutch (C
3
)
2. U/D planetary gear
L
L
Large shift shock or engine stalls when starting off or stopping
Torque converter
L
DI84K–01
Q00515
Speed Sensor
Combination
Meter
Engine & ECT ECU
Transaxle
4–Pulse
4–Pulse
Q00515 Q00514
D10064
V–W
V–W
Engine & ECT ECU
SPD
5 V
Combination Meter
IJ1
8
C14
10
22
E10
V–W
3E
2
3K
12
J/B No. 3
–
DIAGNOSTICS
AUTOMATIC TRANSAXLE
DI–163
LEXUS RX300 (RM785E)
CIRCUIT INSPECTION
DTC
P0500
Vehicle Speed Sensor Malfunction
CIRCUIT DESCRIPTION
The vehicle speed sensor outputs a 4–pulse signal for every revolution of the rotor shaft, which is rotated
by the transaxle output shaft via the driven gear. After this signal is converted into a more precise rectangular
waveform by the waveform shaping circuit inside the combination meter, it is then transmitted to the Engine
& ECT ECU. The Engine & ECT ECU determines the vehicle speed based on the frequency of these pulse
signals.
DTC No.
DTC Detecting Condition
Trouble Area
P0500
No vehicle speed sensor signal to Engine & ECT ECU under
conditions (a) and (b): (2 trip detection logic)
(a) Neutral start switch is OFF
(b) Vehicle is being driven
S Open or short in speed sensor circuit
S No. 1 vehicle speed sensor
S Combination meter
S Engine & ECT ECU
Clutch or brake slips or gear is broken.
Engine & ECT ECU
S Automatic transaxle assembly
WIRING DIAGRAM
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