Troubleshooting the Toyota A/T Temperature Light - ATRA
Troubleshooting the Toyota A/T Temperature Light - ATRA
Troubleshooting the Toyota A/T Temperature Light - ATRA
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<strong>Troubleshooting</strong> <strong>the</strong> <strong>Toyota</strong> A/T <strong>Temperature</strong> <strong>Light</strong><br />
TCM<br />
A/T<br />
Warning<br />
<strong>Light</strong><br />
Module<br />
Oil<br />
2<br />
1<br />
3<br />
4<br />
5<br />
B+<br />
1986-88 Truck or<br />
4Runner<br />
If <strong>the</strong> A/T warning light continues<br />
to stay on, locate <strong>the</strong> transfer case<br />
module on <strong>the</strong> steering column support.<br />
Disconnect <strong>the</strong> 5-wire connector. If <strong>the</strong><br />
light goes out, it indicates a transfer<br />
case problem:<br />
• <strong>the</strong> transfer case fluid is too<br />
hot…<br />
• <strong>the</strong> transfer case temperature<br />
sensor is bad, or…<br />
Transmission<br />
<strong>Temperature</strong><br />
Sensor<br />
Transfer Case<br />
<strong>Temperature</strong><br />
Sensor<br />
A/T Warning <strong>Light</strong><br />
Figure 2<br />
• <strong>the</strong> A/T Warning <strong>Light</strong> Module<br />
is bad.<br />
To check <strong>the</strong> sensor and circuits,<br />
see <strong>the</strong> A/T Warning <strong>Light</strong> Module pin<br />
chart (figure 3).<br />
If <strong>the</strong> A/T warning light stays on,<br />
turn <strong>the</strong> ignition off. Disconnect <strong>the</strong><br />
TCM located at <strong>the</strong> right kick panel.<br />
Then turn <strong>the</strong> ignition back on. If <strong>the</strong><br />
A/T warning light goes out now, it indicates<br />
a transmission problem:<br />
• <strong>the</strong> transmission fluid is too<br />
hot…<br />
A/T Warning<br />
<strong>Light</strong> Module<br />
Oil<br />
TCM Connector View<br />
• <strong>the</strong> transmission temperature<br />
sensor is bad, or…<br />
• <strong>the</strong> TCM is faulty.<br />
If <strong>the</strong> A/T warning light is still on<br />
with both A/T warning light module<br />
and TCM disconnected, <strong>the</strong> warning<br />
light circuit is shorted to ground. Look<br />
for a short in <strong>the</strong> yellow/red wires<br />
between <strong>the</strong> rear instrument panel connector<br />
and ei<strong>the</strong>r terminal 1 of <strong>the</strong> A/T<br />
Warning <strong>Light</strong> Module or terminal OIL<br />
of <strong>the</strong> TCM.<br />
A/T Warning <strong>Light</strong> Module Pin Chart<br />
Pin Function Condition Voltage or Resistance<br />
1 Warning <strong>Light</strong><br />
<strong>Light</strong> Off<br />
<strong>Light</strong> On<br />
12 Volts<br />
< 0.10 Volts<br />
2 Ignition Key On 12 Volts<br />
3 Transfer Case Sensor<br />
Resistance between pins 3 5-20K ohms @ 68°F<br />
4 Transfer Case Sensor<br />
& 4<br />
540-690 ohms @ 248°F<br />
5 Ground Always < 0.10 Volts<br />
Figure 3<br />
Side<br />
View<br />
Transmission <strong>Temperature</strong> Sensor Transfer Case <strong>Temperature</strong> Sensor<br />
Figure 4<br />
36 GEARS April 2006
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