TROUBLE DIAGNOSES — Self-diagnosis (Cont'd) FLUID TEMPERATURE SENSOR CIRCUIT AND A/T CONTROL UNIT POWER SOURCE CIRCUIT CHECKS
AT-42flowchartApplies to A/T (automatic transmission) equipped vehicles only.
Self-diagnosis (Cont'd) FLUID TEMPERATURE SENSOR CIRCUIT AND A/T CONTROL UNIT POWER SOURCE CIRCUIT CHECKS
Circuit Overview — Fluid Temperature Sensor and A/T Control Unit Power Source
Components (5)
Ignition switchFuseFluid temperature sensorTerminal cord assemblyA/T control unit
Fluid Temperature Sensor Circuit and A/T Control Unit Power Source Circuit Checks
1
CHECK A/T CONTROL UNIT POWER SOURCE.
1. Turn ignition switch ON.
2. Check voltage between A/T control unit terminals (29), (30) and ground.
Battery voltage should exist.
N.G.
Check the following items:
Check the following items:
• Harness continuity between ignition switch and A/T control unit (Main harness)
• Ignition switch and fuse — Refer to section EL.
O.K.
2
CHECK FLUID TEMPERATURE SENSOR WITH TERMINAL CORD ASSEMBLY
1. Turn ignition switch OFF.
2. Disconnect terminal cord assembly connector in engine compartment.
3. Check resistance between terminals (12) and (15) when A/T is cold.
Resistance:
Cold [20°C (68°F)]
Approximately 2.5 kΩ
4. Reinstall any part removed.
N.G.
1. Remove oil pan.
1. Remove oil pan.
2. Check the following items:
• Fluid temperature sensor — Refer to "Electrical Components Inspection".
• Harness continuity of terminal cord assembly
O.K.
3
O.K. → (A) [Continue to next page/procedure A]
| Specification | Value |
|---|---|
| Fluid temperature sensor resistance (terminals 12 and 15)Cold [20°C (68°F)] | Approximately 2.5kΩ |
| A/T control unit power source voltage (terminals 29 and 30)Ignition switch ON | Battery voltageV |
Fluid temperature sensor resistance (terminals 12 and 15)Cold [20°C (68°F)]
Approximately 2.5kΩ
A/T control unit power source voltage (terminals 29 and 30)Ignition switch ON
Battery voltageV