TROUBLE DIAGNOSES — Self-diagnosis (Cont'd)
AT-43flowchartA/T (Automatic Transmission) specific diagnostic page. Engine revolution signal uses ignition coil signal via resistor to A/T control unit terminal 25.
Self-diagnosis (Cont'd)
Fluid Temperature Sensor Input Signal Check (Section C)
1
A (from previous page)
2
CHECK INPUT SIGNAL OF FLUID TEMPERATURE SENSOR.
1. [Disconnect connector]
2. Check voltage between A/T control unit terminal (12) and ground while warming up A/T.
Voltage:
Cold [20°C (68°F)] → Hot [80°C (176°F)]: 1.56V → 0.45V
N.G.
Check the following items.
Check the following items.
● Harness continuity between A/T control unit and terminal cord assembly (Main harness)
O.K.
3
Perform self-diagnosis after driving for a while.
N.G.
1. Perform A/T control unit input/output signal inspection.
1. Perform A/T control unit input/output signal inspection.
2. If N.G., recheck A/T control unit pin terminals for damage or connection of A/T control unit harness connector.
O.K.
INSPECTION END
Engine Revolution Signal Circuit Check
1
Perform self-diagnosis (Mode III) for engine control. Check ignition signal circuit condition.
N.G.
Check ignition signal circuit for engine control. — Refer to section EF & EC.
O.K.
2
CHECK INPUT SIGNAL.
1. [Disconnect connector — marked A]
2. Check voltage between A/T control unit terminal (25) and ground.
Voltage: 9.5 - 12V
N.G.
Check the following items.
Check the following items.
● Harness continuity between A/T control unit and ignition coil.
● Resistor
● Ignition coil — Refer to section EF & EC.
O.K.
3
Perform self-diagnosis again after driving for a while.
N.G.
1. Perform A/T control unit input/output signal inspection.
1. Perform A/T control unit input/output signal inspection.
2. If N.G., recheck A/T control unit pin terminals for damage or connection of A/T control unit harness connector.
O.K.
INSPECTION END
| Specification | Value |
|---|---|
| Fluid Temperature Sensor voltage at A/T control unit terminal 12 — ColdCold: 20°C (68°F) | 1.56V |
| Fluid Temperature Sensor voltage at A/T control unit terminal 12 — HotHot: 80°C (176°F) | 0.45V |
| Engine revolution signal voltage at A/T control unit terminal 25Engine running | 9.5 - 12V |
Fluid Temperature Sensor voltage at A/T control unit terminal 12 — ColdCold: 20°C (68°F)
1.56V
Fluid Temperature Sensor voltage at A/T control unit terminal 12 — HotHot: 80°C (176°F)
0.45V
Engine revolution signal voltage at A/T control unit terminal 25Engine running
9.5 - 12V
Fluid Temperature Sensor Circuit
Fluid Temperature SensorA/T control unitPU— Terminal 12
Engine Revolution Signal Circuit
Ignition coilResistor
ResistorA/T control unitY/R— Terminal 25